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Inform       Today is Sunday, May 31, 2020 and day 152 of the year.

Informed on May 30, 2020 at 09:54 PM

Watch Live: SpaceX and NASA to launch 2 astronauts to space station on Saturday

Informer : አስኳላ / Askwala

SpaceX and NASA are about to make history, sending astronauts from U.S. soil to the International Space Station. It’s the first crewed mission launched from the U.S. since the Space Shuttle program ended in 2011. And you can watch history in the making here. After bad weather caused a launch delay on May 27, the astronauts are preparing to try again at 3:22 p.m. EDT on Saturday, May 30, from Kennedy Space Center in Florida.  


Source:  © Livescience

Informed on May 30, 2020 at 07:35 AM

ESPRESSO confirms the presence of an Earth around the nearest star

Informer : አስኳላ / Askwala

The existence of a planet the size of Earth around the closest star in the solar system, Proxima Centauri, has been confirmed by an international team of scientists including researchers from the University of Geneva (UNIGE). The results, which you can read all about in the journal Astronomy & Astrophysics, reveal that the planet in question, Proxima b, has a mass of 1.17 earth masses and is located in the habitable zone of its star, which it orbits in 11.2 days. This breakthrough has been possible thanks to radial velocity measurements of unprecedented precision using ESPRESSO, the Swiss-manufactured spectrograph – the most accurate currently in operation  


Source:  © Université de Genève

Informed on May 28, 2020 at 06:43 AM

Astronomers Discover New Class of Cosmic Explosions

Informer : አስኳላ / Askwala

Astronomers have found two objects that, added to a strange object discovered in 2018, constitute a new class of cosmic explosions. The new type of explosion shares some characteristics with supernova explosions of massive stars and with the explosions that generate gamma-ray bursts (GRBs), but still has distinctive differences from each.  


Source:  © National Radio Astronomy Observatory

Informed on May 27, 2020 at 03:55 AM

Astronomers see ‘cosmic ring of fire’, 11 billion years ago

Informer : አስኳላ / Askwala

Astronomers have captured an image of a super-rare type of galaxy – described as a “cosmic ring of fire” – as it existed 11 billion years ago.  


Source:  © ARC Centre of Excellence for All Sky Astrophysics in 3D (ASTRO 3D)

Informed on May 22, 2020 at 02:49 PM

ESO Telescope Sees Signs of Planet Birth

Informer : አስኳላ / Askwala

Observations made with the European Southern Observatory’s Very Large Telescope (ESO’s VLT) have revealed the telltale signs of a star system being born. Around the young star AB Aurigae lies a dense disc of dust and gas in which astronomers have spotted a prominent spiral structure with a ‘twist’ that marks the site where a planet may be forming. The observed feature could be the first direct evidence of a baby planet coming into existence.  


Source:  © ESO

Informed on May 22, 2020 at 02:46 PM

Supercomputer model simulations reveal cause of Neanderthal extinction

Informer : አስኳላ / Askwala

Climate scientists from the IBS Center for Climate Physics discover that, contrary to previously held beliefs, Neanderthal extinction was neither caused by abrupt glacial climate shifts, nor by interbreeding with Homo sapiens. According to new supercomputer model simulations, only competition between Neanderthals and Homo sapiens can explain the rapid demise of Neanderthals around 43 to 38 thousand years ago.  


Source:  © Institute for Basic Science

Informed on May 22, 2020 at 02:41 PM

ALMA Discovers Massive Rotating Disk in Early Universe

Informer : አስኳላ / Askwala

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In our 13.8 billion-year-old universe, most galaxies like our Milky Way form gradually, reaching their large mass relatively late. But a new discovery made with the Atacama Large Millimeter/submillimeter Array (ALMA) of a massive rotating disk galaxy, seen when the universe was only ten percent of its current age, challenges the traditional models of galaxy formation.  


Source:  © National Radio Astronomy Observatory

Informed on May 21, 2020 at 05:07 AM

NASA’s Curiosity Rover Finds Clues to Chilly Ancient Mars Buried in Rocks

Informer : አስኳላ / Askwala

By studying the chemical elements on Mars today including carbon and oxygen — scientists can work backwards to piece together the history of a planet that once had the conditions necessary to support life.  


Source:  © NASA/Goddard Space Flight Center

Informed on May 20, 2020 at 04:47 AM

No evidence of an influence of dark matter on the force between nuclei

Informer : አስኳላ / Askwala

Although most of the universe is made up of dark matter, very little is known about it. Physicists from Heinrich Heine University Düsseldorf (HHU) led by Prof. Stephan Schiller have used a high-precision experiment to look for interaction between dark matter and normal matter.  


Source:  © Heinrich-Heine University Duesseldorf

Informed on May 20, 2020 at 04:11 AM

Astronomers develop ‘decoder’ to gauge exoplanet climate

Informer : አስኳላ / Askwala

After examining a dozen types of suns and a roster of planet surfaces, Cornell astronomers have developed a practical model – an environmental color “decoder” – to tease out climate clues for potentially habitable exoplanets in galaxies far away.  


Source:  © Cornell University

Informed on May 16, 2020 at 06:10 AM

NASA’s ICESat-2 Measures Arctic Ocean’s Sea Ice Thickness, Snow Cover

Informer : አስኳላ / Askwala

Arctic sea ice helps keep Earth cool, as its bright surface reflects the Sun’s energy back into space. Each year scientists use multiple satellites and data sets to track how much of the Arctic Ocean is covered in sea ice, but its thickness is harder to gauge. Initial results from NASA’s new Ice Cloud and land Elevation Satellite-2 (ICESat-2) suggest that the sea ice has thinned by as much as 20% since the end of the first ICESat mission (2003-2009), contrary to existing studies that find sea ice thickness has remained relatively constant in the last decade.  


Source:  © NASA/Goddard Space Flight Center

Informed on May 16, 2020 at 05:37 AM

Seeing the Universe Through New Lenses

Informer : አስኳላ / Askwala

Like crystal balls for the universe’s deeper mysteries, galaxies and other massive space objects can serve as lenses to more distant objects and phenomena along the same path, bending light in revelatory ways.

Gravitational lensing was first theorized by Albert Einstein more than 100 years ago to describe how light bends when it travels past massive objects like galaxies and galaxy clusters.  


Source:  © DOE/Lawrence Berkeley National Laboratory

Informed on May 15, 2020 at 07:00 AM

What’s Mars made of?

Informer : አስኳላ / Askwala

Earth-based experiments on iron-sulfur alloys thought to comprise the core of Mars reveal details about the planet’s seismic properties for the first time. This information will be compared to observations made by Martian space probes in the near future. Whether the results between experiment and observation coincide or not will either confirm existing theories about Mars’ composition or call into question the story of its origin.  


Source:  © University of Tokyo

Informed on May 15, 2020 at 05:53 AM

New Comet Discovered by ESA and NASA Solar Observatory

Informer : አስኳላ / Askwala

In late May and early June, Earthlings may be able to glimpse Comet SWAN. The comet is currently faintly visible to the unaided eye in the Southern Hemisphere just before sunrise — providing skywatchers with a relatively rare glimpse of a comet bright enough to be seen without a telescope. But Comet SWAN's initial discovery was made not from the ground, but via an instrument on board ESA (the European Space Agency) and NASA's Solar and Heliospheric Observatory, or SOHO, satellite.  


Source:  © NASA/Goddard Space Flight Center

Informed on May 14, 2020 at 03:58 AM

Ancient rocks show high oxygen levels on Earth 2 billion years ago

Informer : አስኳላ / Askwala

Earth may have been far more oxygen-rich early in its history than previously thought, setting the stage for the evolution of complex life, according to new research by scientists at the University of Alberta and the University of Tartu in Estonia. The study provides evidence for elevated oxygen levels 2 billion years ago and flies in the face of previously accepted models.  


Source:  © University of Alberta

Informed on May 14, 2020 at 03:51 AM

Growing mountains or shifting ground: What is going on in Earth’s inner core?

Informer : አስኳላ / Askwala

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Exhaustive seismic data from repeating earthquakes and new data-processing methods have yielded the best evidence yet that the Earth’s inner core is rotating – revealing a better understanding of the hotly debated processes that control the planet’s magnetic field.  


Source:  © University of Illinois at Urbana-Champaign, News Bureau

Informed on May 13, 2020 at 03:14 AM

SCIENTIST MODELED MARS CLIMATE TO UNDERSTAND HABITABILITY

Informer : አስኳላ / Askwala

A Southwest Research Institute scientist modeled the atmosphere of Mars to help determine that salty pockets of water present on the Red Planet are likely not habitable by life as we know it on Earth. A team that also included scientists from Universities Space Research Association (USRA) and the University of Arkansas helped allay planetary protection concerns about contaminating potential Martian ecosystems.  


Source:  © Southwest Research Institute

Informed on May 12, 2020 at 04:15 AM

The innate grammar of the brain

Informer : አስኳላ / Askwala

In contrast to Siri and Alexa, the brain uses grammatical rules rather than word probabilities to group words together when listening to speech.  


Source:  © eLife

Informed on May 09, 2020 at 05:34 AM

Telescopes and Spacecraft Join Forces to Probe Deep into Jupiter\'s Atmosphere

Informer : አስኳላ / Askwala

NASA's Hubble Space Telescope and the ground-based Gemini Observatory in Hawaii have teamed up with the Juno spacecraft to probe the mightiest storms in the solar system, taking place more than 500 million miles away on the giant planet Jupiter.  


Source:  © NASA/Goddard Space Flight Center

Informed on May 08, 2020 at 06:19 AM

Astronomers Finds Closest Black Hole to Earth

Informer : አስኳላ / Askwala

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A team of astronomers from the European Southern Observatory (ESO) and other institutes has discovered a black hole lying just 1000 light-years from Earth. The black hole is closer to our Solar System than any other found to date and forms part of a triple system that can be seen with the naked eye. The team found evidence for the invisible object by tracking its two companion stars using the MPG/ESO 2.2-metre telescope at ESO’s La Silla Observatory in Chile. They say this system could just be the tip of the iceberg, as many more similar black holes could be found in the future.  


Source:  © ESO

Informed on May 07, 2020 at 08:26 AM

Study reveals how spaceflight affects risk of blood clots in female astronauts

Informer : አስኳላ / Askwala

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The study, published in Aviation Medicine and Human Performance, in collaboration with King’s, the Centre for Space Medicine Baylor College of Medicine, NASA Johnson Space Centre and the International Space University, examines the potential risk factors for developing a blood clot (venous thromboembolism) in space.  


Source:  © King\'s College London

Informed on May 06, 2020 at 04:33 AM

Exoplanets: How we’ll search for signs of life

Informer : አስኳላ / Askwala

Whether there is life elsewhere in the universe is a question people have pondered for millennia, and within the last few decades, great strides have been made in our search for signs of life outside of our solar system.

NASA missions like the space telescope Kepler have helped us document thousands of exoplanets — planets that orbit around other stars. And current NASA missions like Transiting Exoplanet Survey Satellite (TESS) are expected to vastly increase the current number of known exoplanets. It is expected that dozens will be Earth-sized rocky planets orbiting in their stars’ habitable zones, at distances where water could exist as a liquid on their surfaces. These are promising places to look for life.  


Source:  © Arizona State University

Informed on May 02, 2020 at 05:31 AM

Astronomers capture rare images of planet-forming disks around stars

Informer : አስኳላ / Askwala

An international team of astronomers has captured fifteen images of the inner rims of planet-forming disks located hundreds of light years away. These disks of dust and gas, similar in shape to a music record, form around young stars. The images shed new light on how planetary systems are formed.  


Source:  © KU Leuven

Informed on May 01, 2020 at 03:19 AM

Newly Discovered Exoplanet Dethrones Former King Of Kepler-88 Planetary System

Informer : አስኳላ / Askwala

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A team of astronomers led by the University of Hawaiʻi Institute for Astronomy (UH IfA) has discovered a planet three times the mass of Jupiter in a distant planetary system.  


Source:  © W. M. Keck Observatory

Informed on Feb 07, 2020 at 09:04 AM

የሕዋ ተመራማሪዋ ክብረ ወሰን በማሻሻል ወደ ምድር ተመለሰች

Informer : Askwala

የሕዋ ተመራማሪዋ ወደ ምድር ተመለሰች በሕዋ ላይ በመቆየት አዲስ የዓለም ክብረ ወሰን ያስመዘገበችው የናሳ የጠፈር ተመራማሪዋ ክርስቲና ኮች በሰላም ወደ ምድር ተመለሰች። ክርስቲና በዓለም አቀፉ የሕዋ የምርምር ጣቢያ ለ328 ቀናት ከሌሎች ሁለት ባልደረቦቿ ጋር በመሆን ሲያደርጉ የነበረውን የምርምር ስራ አጠናቀው ካዛኪስታን ውስጥ በሚገኝ አንድ ስፍራ ማረፋቸው ታውቋል። የ41 ዓመቷ ክርስቲና በዚህ የሕዋ ላይ ቆይታዋ በሌላኛዋ አሜሪካዊት የናሳ የህዋ ተመራማሪ ቬትራን ፔጊ ዊትሰን ተይዞ የነበረውን የ289 ቀናት ሕዋ ላይ የመቆየት ክብረ ወሰን በማሻሻል ታሪክ ሰርታለች። በህዋ ላይ የመሬት ስበት አልባ ቆይታዋ እንደሚናፍቃት የተናገረችው ኮች በፈለኩት ጊዜ መጣሪያ እና በወለል መሃል ተንሳፎ መቆየት ለእርሷ አዝናኝ እንደነበር ገልጻለች። ከእርሷ ቀድማ ወደ ጠፈር ሶስት ጊዜ የተመላለሰችውን የ59 አመቷን ቬትራን ዊትሰንን ለእኔ ጀግናዬ ናት ስትልም አሞካሽታታለች ።አሜሪካ በህዋ ሳይንስ የምርምር ሥራዎች ሴቶችን ለማትጋት ለሚሰሩ እና ለትርፍ ያልተቋቋሙ ድርጅቶች የገንዘብ ድጋፍ ለማድረግ እንቅስቃሴ በተጀመረበት ሰዓት ኬች ወደ ምድር መመለሷ ሴቶችን በብዛት ወደ መስኩ ለመሳብ ምቹ ሁኔታ እንደሚፈጥርም ተገልጿል። ኮች ከሩሲያው የጠፈር ኤጄንሲ ባልደረባ ዲሚትሪ ሮጎዚን እና ከአውሮጳ የጠፈር ኤጄንሲ ባልደረባ ሉካ ፓርሚታኖ ጋር በመሆን ነው 328 ቀናቱን በህዋ ላይ ያሳለፈችው።  


Source:  © ዶይቼ ቬለ

Informed on Jan 12, 2020 at 04:14 PM

What is Age of Enlightenment?

Informer : Space

Age of Enlightenment, a term used to describe the trends in thought and letters in Europe and the American colonies during the 18th century prior to the French Revolution (1789-1799). The phrase was frequently employed by writers of the period itself, convinced that they were emerging from centuries of darkness and ignorance into a new age enlightened by reason, science, and a respect for humanity. The period also often is referred to as the Age of Reason.  


Source:  © Microsoft Encarta

Informed on Jan 11, 2020 at 06:17 PM

Unidentified Flying Object (UFO)

Informer : Space

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Unidentified Flying Object (UFO), any object or light, reportedly sighted in the sky, that cannot be immediately explained by the observer. Sightings of unusual aerial phenomena date back to ancient times, but UFOs (sometimes called flying saucers) became widely discussed only after the first widely publicized U.S. sighting in 1947. Many thousands of such observations have since been reported worldwide.

At least 90 percent of UFO sightings can be identified as conventional objects, although time-consuming investigations are often necessary for such identification. The objects most often mistaken for UFOs are bright planets and stars, aircraft, birds, balloons, kites, aerial flares, peculiar clouds, meteors, and satellites. The remaining sightings most likely can be attributed to other mistaken sightings or to inaccurate reporting, hoaxes, or delusions, although to disprove all claims made about UFOs is impossible.

From 1947 to 1969 the U.S. Air Force investigated UFOs as a possible threat to national security. A total of 12,618 reports was received, of which 701 reports, or 5.6 percent, were listed as unexplained. The air force concluded that “no UFO reported, investigated, and evaluated by the Air Force has ever given any indication of threat to our national security.” Since 1969 no agency of the U.S. government has had any active program of UFO investigation.

In 1997 the U.S. Central Intelligence Agency (CIA) admitted that the U.S. military had deceived the American public in an effort to hide information about high-altitude spy planes. These planes, the Lockheed U-2A and the Lockheed SR-71, accounted for over half of the UFO reports during the late 1950s and 1960s.

Some persons nevertheless believe that UFOs are extraterrestrial spacecraft, even though no scientifically valid evidence supports that belief. The possibility of extraterrestrial civilizations is not the stumbling block; most scientists grant that intelligent life may well exist elsewhere in the universe. A fully convincing UFO photograph of a craftlike object has yet to be taken, however, and the scientific method requires that highly speculative explanations should not be adopted unless all of the more ordinary explanations can be ruled out.

UFO enthusiasts persist, however, and some persons even claim to have been abducted and taken aboard UFOs. (A close encounter of the third kind is UFO terminology for an alleged encounter between humans and visitors from outer space.) No one has produced scientifically acceptable proof of these claims.  


Source:  © Microsoft Encarta

Informed on Dec 26, 2019 at 03:19 PM

What is Tsunami?

Informer : Space

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Tsunami, Japanese word meaning “harbor wave,” used as the scientific term for a class of abnormal sea wave that can cause catastrophic damage when it hits a coastline. Tsunamis can be generated by an undersea earthquake, an undersea landslide, the eruption of an undersea volcano, or by the force of an asteroid crashing into the ocean. The most frequent cause of tsunamis is an undersea earthquake. When the ocean floor is uplifted or offset during an earthquake, a set of waves is created similar to the concentric waves generated by an object dropped into the water. Most tsunamis originate along the Ring of Fire, a zone of volcanoes and seismic activity, 32,500 km (24,000 mi) long, which encircles the Pacific Ocean. Since 1819, about 40 tsunamis have struck the Hawaiian Islands.

A tsunami can have wavelengths, or widths (the distance between one wave crest to the next), of 100 to 200 km (60 to 120 mi), and may travel hundreds of kilometers across the deep ocean, reaching speeds of about 725 to 800 km/h (about 450 to 500 mph). A tsunami is not one wave but a series of waves. In the deep ocean, the waves may be only about half a meter (a foot or two) high. People onboard a ship passing over it would not even notice the tsunami. Upon entering shallow coastal waters, however, the waves may suddenly grow rapidly in height. When the waves reach the shore, they may be 15 m (50 ft) high or more. Tsunamis can also take the form of a very fast tide or bore, depending on the shape of the sea floor.  


Source:  © Microsoft Encarta

Informed on Nov 15, 2019 at 04:39 PM

የስፔስ ኤክስ ስታርሊንክ የሳተላይቶች ስብስብ በምሽት ሰማይ ላይ

Informer : Ethiopian Space Science Society

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በትናንትናው ምሽት በሀገራችን ሰማይ ላይ እንደኮኮብ እያበሩ ተሰልፈው በመጓዝ የተለየ ትእይንትና ገረሜታን የፈጠሩት የስፔስ ኤክስ የተሰኘው የጠፈር በምርምር ላይ የሚሰራ ድርጅት ያመጠቃቸው 60 የሳተላይቶች ስብስብ ሲሆኑ እነዚህም ካምፓኒው ሊያመጥቃቸው ካቀደው 12 ሺ ሳተላይቶች ስብስብ ውስጥ የመጀመሪያዎቹ ናችው።

እነዚህ ሳተላይቶች ስፔስ ኤክስ አለም አቀፍ ሽፋን የሚሰጥ የሳተላይት የኢንተርኔት አገልግሎትን ለመዘርጋት እንዲያስችል ያመነጠቃቸው ነው።

በዚህም ያልተለመደ የሰማይ ላይ እይታ ማህበረሰባችን መደናገጥ እንደሌለበት የኢትዮጵያ ስፔስ ሳይንስ ሶሳይቲ ሊያሳስብ ይወዳል።

እነዚህ ሳተላይቶች ምድርን የሚዝሆሩ ሲሆን፤ በድጋሚም በዛሬው ምሽት እነዚህ ሳተላይቶች ወደ 18:41 ሰአት አከባቢ በሰማይ ላይ ሲያልፉ ከአዲስ አበባ ሊታዩ የሚችሉበት አጋጣሚ አለ። ይህንን እይታ ከአዲስ አበባ ወይም ካሉበት ቦታ ሆነው መቼና በየትኛው ሰአት ለማየት እንደሚችሉ ለማወቅ ከታች ያለውን ሊንክ ይጫኑ።  


Source:  © Ethiopian Space Science Society

Informed on Nov 10, 2019 at 01:12 PM

Call for publication

Informer : Space

Research and publications are two sides of a coin and one drives the other. AAU has designed publication incentive to encourage research and publication at the university, which has been implemented since a while now.

The Office would like to inform all academic staffs and researchers to submit their 2018 published articles in a reputable journal for incentive. Please submit using AAU CONVERIS at converis.aau.edu.et research portal between October 18 and November 18.

Important information:

1. Submission deadline: November 18, 2019. The software will not accept any late submission and the office will not entertain either.
2. Submit ONLY 2018 publication.
3. Please attach filled, signed and scan copy of the attached Publication Incentive Submission Form.

For more info visit the university's website  


Source:  © AAU

Informed on Nov 06, 2019 at 03:43 PM

What is radar?

Informer : Space

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Radar (Radio Detection And Ranging), remote detection system used to locate and identify objects. Radar signals bounce off objects in their path, and the radar system detects the echoes of signals that return. Radar can determine a number of properties of a distant object, such as its distance, speed, direction of motion, and shape. Radar can detect objects out of the range of sight and works in all weather conditions, making it a vital and versatile tool for many industries.

Radar has many uses, including aiding navigation in the sea and air, helping detect military forces, improving traffic safety, and providing scientific data. One of radar’s primary uses is air traffic control, both civilian and military. Large networks of ground-based radar systems help air traffic controllers keep track of aircraft and prevent midair collisions. Commercial and military ships also use radar as a navigation aid to prevent collisions between ships and to alert ships of obstacles, especially in bad weather conditions when visibility is poor. Military forces around the world use radar to detect aircraft and missiles, troop movement, and ships at sea, as well as to target various types of weapons. Radar is a valuable tool for the police in catching speeding motorists. In the world of science, meteorologists use radar to observe and forecast the weather. Other scientists use radar for remote sensing applications, including mapping the surface of the earth from orbit, studying asteroids, and investigating the surfaces of other planets and their moons.
The above figure shows :-
Radar Dish
Radar antennas, such as this one at London's Heathrow airport, enable air-traffic controllers to safely and efficiently direct airplanes in flight. The shape of the dish is designed to focus radar waves into a beam that scatters off aircraft. The part of the beam that gets reflected is detected by the radar dish and gives important information about the airplane, such as its altitude, heading, and speed.  


Source:  © Microsoft Student With Encarta Premium

Informed on Nov 06, 2019 at 03:18 PM

Natural Satellite

Informer : Space

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Natural Satellite, a body in space that orbits a larger body. The larger body is referred to as the satellite’s primary. Natural satellites that orbit planets are often called moons. Other objects in the solar system that sometimes have satellites include dwarf planets, Kuiper Belt Objects, centaurs, and asteroids. The term satellite is also used to refer to small galaxies that orbit larger galaxies.

Natural satellites are of special interest to astronomers and planetary scientists because these objects provide clues to how the planets and the solar system formed. Studying the orbits of satellites also allows scientists to determine the mass and density of planets and other objects. A number of moons are important to astrobiologists as places where conditions might permit extraterrestrial life to exist. The International Astronomical Union (IAU) gives official names to natural satellites.
The above figure shows :-
Earth’s Moon
The Moon, Earth’s only natural satellite, orbits Earth about once every 27 days. Among the planets in the solar system, only two—Mercury and Venus—lack natural satellites. Several planets have multiple satellites; Jupiter and Saturn have the most.  


Source:  © Microsoft Student With Encarta Premium

Informed on Oct 26, 2019 at 05:31 PM

Dark Matter

Informer : Space

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Dark Matter, in astronomy, designation for matter that does not give off or reflect detectable electromagnetic radiation, the radiant energy that includes visible light, radio waves, infrared radiation, X rays, and gamma rays. Although dark matter is practically invisible, astrophysicists have determined its existence by detecting its gravitational interaction with matter that does give off detectable electromagnetic radiation, such as stars, galaxies, and clusters of galaxies. Dark matter has become a vital component of modern theories of cosmology and elementary particle physics. Along with the phenomenon of dark energy, the puzzle of what dark matter is represents one of the most important questions in physics today.
Dark matter is a still unidentified substance that makes up about 23 percent of the universe. It is thought to surround most galaxies, affecting their shapes by its gravity. Ordinarily it cannot be seen. This composite picture of galaxy cluster 1E 0657-556 was created from images taken by different space telescopes in X-ray and visible light. The cluster is actually two giant groups of galaxies that collided head-on. The dark matter around the groups of galaxies is indicated by the blue regions, which bend the light from more distant galaxies in the background. The pink regions are hot gas stripped away in the collision.  


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Source:  © Microsoft Student With Encarta Premium

Informed on Sep 19, 2019 at 03:27 PM

What is Rocket

Informer : Wegen

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Rocket, self-propelled device that carries its own fuel, as well as the oxygen, or other chemical agent, needed to burn its fuel. Most rockets move by burning their fuel and expelling the hot exhaust gases that result. The force of these hot gases shooting out in one direction causes the rocket to move in the opposite direction. A rocket engine is the most powerful engine for its weight. Other forms of propulsion, such as jet-powered and propeller-driven engines, cannot match its power. Rockets can operate in space, because they carry their own oxygen for burning their fuel. Rockets are presently the only vehicles that can launch into and move around in space.
A rocket can be as simple and small as a firework, which has a small amount of thrust, or as complex and powerful as the Saturn V rocket, which took humans to the Moon. British Congreve war rockets, which were used in the War of 1812, are referred to in a line of the United States national anthem: “And the rockets red glare…” Rockets have many applications both on Earth and in space. The most common and well-known use of rockets is for missiles—weapons that deliver explosive warheads through the air to specified targets (see Guided Missile). Rockets also have numerous peaceful purposes. Upper atmospheric research rockets, or sounding rockets, carry scientific instruments to high altitudes, helping scientists carry out astronomical research and learn more about the nature of the atmosphere. Jet-Assisted-Take-Off (JATO) rockets help lift heavily loaded planes from runways. Lifesaving rockets carry lifeline ropes to ships stranded offshore. Ships in distress can launch signal rockets to signal for help. Rocket ejection seats safely boost pilots out of jet planes during emergencies. Fireworks have provided entertainment for centuries, and model rockets form the basis of a popular hobby.

 


Source:  © Microsoft Student With Encarta Premium

Informed on Sep 17, 2019 at 02:24 PM

Freefall

Informer : Wegen

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Falling objects accelerate in response to the force exerted on them by Earth’s gravity. Different objects accelerate at the same rate, regardless of their mass. This illustration shows the speed at which a ball and a cat would be moving and the distance each would have fallen at intervals of a tenth of a second during a short fall.  


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Source:  © Microsoft Student With Encarta Premium

Informed on Sep 16, 2019 at 02:46 PM

Black Hole

Informer : Space

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Black Hole, an extremely dense celestial body that has been theorized to exist in the universe. The gravitational field of a black hole is so strong that, if the body is large enough, nothing, including electromagnetic radiation, can escape from its vicinity. The body is surrounded by a spherical boundary, called a horizon, through which light can enter but not escape; it therefore appears totally black.  


Source:  © Microsoft Student With Encarta Premium

Informed on Sep 14, 2019 at 02:32 PM

Expanding Universe Experiment Big Bang Theory

Informer : Wegen

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One way to understand the concept of an expanding universe is to draw dots, representing galaxies, on a balloon. As the balloon is inflated, each dot moves away from all the others. To a person viewing the universe from a galaxy, all other galaxies would seem to be receding. The distant galaxies appear to be moving away faster than the near ones, which demonstrates Hubble’s law. Most astronomers now believe that this expansion will continue forever.  


Source:  © Microsoft Student With Encarta Premium

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