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Aljazeera - Libyan rebels ready for battle

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Channels: News 

Added: 436 days ago by VReal

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Search for Another Earth Hubble directly observes planet orbiting Fomalhaut

Search for Another Earth The NASA/ESA Hubble Space Telescope has discovered an extrasolar planet, for the first time using direct visible-light imaging. The strange world is far-flung from its parent star, is surrounded by a colossal belt of gas and dust, and may even have rings more impressive than Saturn's. HUBBLE DIRECTLY OBSERVES A PLANET ORBITING ANOTHER STAR WASHINGTON — NASA's Hubble Space Telescope has taken the first visible-light snapshot of a planet circling another star. Estimated to be no more than three times Jupiter's mass, the planet, called Fomalhaut b, orbits the bright southern star Fomalhaut, located 25 light-years away in the constellation Piscis Australis, or the "Southern Fish." Fomalhaut has been a candidate for planet hunting ever since an excess of dust was discovered around the star in the early 1980s by NASA's Infrared Astronomy Satellite, IRAS. In 2004, the coronagraph in the High Resolution Camera on Hubble's Advanced Camera for Surveys produced the first-ever resolved visible-light image of the region around Fomalhaut. It clearly showed a ring of protoplanetary debris approximately 21.5 billion miles across and having a sharp inner edge. This large debris disk is similar to the Kuiper Belt, which encircles the solar system and contains a range of icy bodies from dust grains to objects the size of dwarf planets, such as Pluto. Hubble astronomer Paul Kalas, of the University of California at Berkeley, and team members proposed in 2005 that the ring was being gravitationally modified by a planet lying between the star and the ring's inner edge. Circumstantial evidence came from Hubble's confirmation that the ring is offset from the center of the star. The sharp inner edge of the ring is also consistent with the presence of a planet that gravitationally "shepherds" ring particles. Independent researchers have subsequently reached similar conclusions. Now, Hubble has actually photographed a point source of light lying 1.8 billion miles inside the ring's inner edge. The results are being reported in the November 14 issue of Science magazine. "Our Hubble observations were incredibly demanding. Fomalhaut b is 1 billion times fainter than the star. We began this program in 2001, and our persistence finally paid off," Kalas says. "Fomalhaut is the gift that keeps on giving. Following the unexpected discovery of its dust ring, we have now found an exoplanet at a location suggested by analysis of the dust ring's shape. The lesson for exoplanet hunters is 'follow the dust,'" said team member Mark Clampin of NASA's Goddard Space Flight Center in Greenbelt, Md. Observations taken 21 months apart by Hubble's Advanced Camera for Surveys' coronagraph show that the object is moving along a path around the star, and is therefore gravitationally bound to it. The planet is 10.7 billion miles from the star, or about 10 times the distance of the planet Saturn from our sun. The planet is brighter than expected for an object of three Jupiter masses. One possibility is that it has a Saturn-like ring of ice and dust reflecting starlight. The ring might eventually coalesce to form moons. The ring's estimated size is comparable to the region around Jupiter and its four largest orbiting satellites. Kalas and his team first used Hubble to photograph Fomalhaut in 2004, and made the unexpected discovery of its debris disk, which scatters Fomalhaut's starlight. At the time they noted a few bright sources in the image as planet candidates. A follow-up image in 2006 showed that one of the objects is moving through space with Fomalhaut but changed position relative to the ring since the 2004 exposure. The amount of displacement between the two exposures corresponds to an 872-year-long orbit as calculated from Kepler's laws of planetary motion. Future observations will attempt to see the planet in infrared light and will look for evidence of water vapor clouds in the atmosphere. This would yield clues to the evolution of a comparatively newborn 100-million-year-old planet. Astrometric measurements of the planet's orbit will provide enough precision to yield an accurate mass. NASA's James Webb Space Telescope, scheduled to launch in 2013 will be able to make coronagraphic observations of Fomalhaut in the near- and mid-infrared. Webb will be able to hunt for other planets in the system and probe the region interior to the dust ring for structures such as an inner asteroid belt. For more information about the Hubble Space Telescope, visit: http://www.nasa.gov/hubble http://hubblesite.org/news/2008/39 -end-

NASA  ESA  Hubble  Space  Telescope  Fomalhaut  extrasolar  planet  New  Horizons  Celestial  Horizon  Light  Universe 

Channels: Astronomy And Space 

Added: 720 days ago by poker1

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Birth And Death Of The Universe

Hubble Space Telescope - 15 Years of Discovery (Episode 8): Birth And Death Of The Universe. In the 15 years that the NASA/ESA Hubble Space Telescope has orbited Earth, it has taken three-quarters of a million photographs of the cosmos. --- Please subscribe to Science & Reason: • http://www.youtube.com/Best0fScience • http://www.youtube.com/ScienceMagazine • http://www.youtube.com/FFreeThinker --- In many ways Hubble is the most successful scientific project in the World, and this event is not likely to go unnoticed. The European Space Agency, ESA, has decided to celebrate this anniversary with the production of a Hubble 15th Anniversary movie called "Hubble - 15 Years Of Discovery". The movie covers all aspects of the Hubble Space Telescope project: a journey through the history, the trouble and the scientific successes of Hubble. This portrait of one of the biggest scientific projects of all time contains large amounts of previously unpublished footage in uncompromised quality. With the beautiful backdrop of Hubbles visual image treasures running as a red line through the movie, the light and dreaming style tells the most interesting stories about our fascinating Universe and about the change of vision that Hubble has brought us. --- The Hubble Space Telescope (HST), named after Edwin Powell Hubble (1889-1953) who was one of the great pioneers of modern astronomy, is a collaboration between ESA and NASA. It is a long-term, space-based observatory. The observations are carried out in visible, infrared and ultraviolet light. In many ways Hubble has revolutionised modern astronomy, not only by being an efficient tool for making new discoveries, but also by driving astronomical research in general. During 15 years of viewing the sky, Hubble has taken more than 700000 exposures of more than 22 000 celestial objects. The spacecraft itself has whirled around Earth nearly 88 000 times, travelling more than 4000 million kilometres. The orbiting observatory generates enough data every day - about 15 gigabytes - to fill more than three DVDs, and in total it has produced 23 terabytes of data, equal to the amount of text in 23 million novels. Over 3900 astronomers from all over the world have used the telescope, and compiled a long list of scientific achievements, published in more than 4000 papers, such as: - calculating the precise age of the Universe to be 13 700 million years old); - confirming the existence of a strange form of energy called dark energy; - detecting small proto-galaxies that emitted their light when the Universe was less than a 1000 million years old; - proving the existence of super-massive black holes; - seeing a comet hitting Jupiter; and - showing that the process of forming planetary systems is common throughout the galaxy. http://www.esa.int http://www.spacetelescope.org .

birth  death  universe  big  bang  nasa  esa  hubble  space  telescopes  earth  cosmos  observatories  astronomers  dark  matter  energy  galaxies  supermassive  black  holes  planetary  systems  infrared  ultraviolet  visible  light  discoveries  astronomy 

Channels: Astronomy And Space 

Added: 720 days ago by poker1

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Earth view from outer space

Some pictures taken from near earth orbit and from outer space showing our beautiful earth, astronauts working in space, space shuttle Endeavour, International Space Station (ISS), the hubble telescope and astronauts walking on the moon. Hope you´ll enjoy it ;)

ISS  Earth  Space  Shuttle  Astronauts  Moon  Universe  Galaxy  Hubble  Sun  Stars  NASA  ESA  Solar-System  Orrery  Apollo11  Orbit  Endeavour  Columbia  Atlantis  Challenger  Discovery  Gravity  BlackHole  NeilArmstrong  BuzzAldrin  MichaelCollins  Apollo13  Lovell  Swigert  Haise 

Channels: Astronomy And Space 

Added: 720 days ago by poker1

Runtime: 04:26 | Views: 119 | Comments: 0

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