... Voyager Spacecraft Introduction (This Page) . ... The twin Voyager spacecraft, over the course of a dozen years, drew back the curtain on nearly half of the solar system . From launch in 1977 through the spectacular parting shots in 1989 of Neptune at the outer reaches of the solar system, this pair of gangly, instrument-laden spacecraft explored four planets -- Jupiter , Saturn , Uranus and Neptune -- as well as tens of moons, and the rings and magnetic environments of those planetary systems. ...

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• Automated Spacecraft
• Ulysses
• Mariner 10

... It was designed to observe the solar wind approaching Earth, from a position near the Lagrangian point L1, and it is part of the International Solar-Terrestrial Physics (ISTP) Initiative . ... The original plan called for "Wind" to approach its final station over two years, undergoing two close encounters with the Moon to boost its speed. ... If however the object is moving , the encounter is not symmetric, and in the end the spacecraft may have gained or lost speed, depending on its trajectory. ...

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• Spacecraft that Explore Distant Space
• Polar Orbiting Satellites
• MARS TOGETHER

Astronomy Picture of the Day . ... This picture was taken by the Voyager 2 spacecraft in 1986 - the only spacecraft ever to visit Neptune. Neptune will be the farthest planet from the Sun until 1999, when the elliptical orbit of Pluto will cause it to once again resume this status. ... Mercury: Closest Planet to the Sun . ... Space Shuttle Atlantis lands at Edwards Air Force Base in California. ... Space Shuttle Challenger jumps off the launch pad in 1985 to begin a successful mission. ...

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... It was designed to observe the solar wind approaching Earth, from a position near the Lagrangian point L1, and it is part of the International Solar-Terrestrial Physics (ISTP) Initiative . ... The original plan called for "Wind" to approach its final station over two years, undergoing two close encounters with the Moon to boost its speed. ... If however the object is moving , the encounter is not symmetric, and in the end the spacecraft may have gained or lost speed, depending on its trajectory. ...

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• Spacecraft that Explore Distant Space
• Galileo to Jupiter
• History of Space Exploration

Astronotes Armagh Planetarium's Stellar Blog! ... Space Flight . ... Posted on January 16, 2014 | No Comments With an eventful stargazing year behind and us teetering on the brink of 2014 wondering what it may have in store, we can plunge in with confidence knowing that the [ ] . Continue Reading.. ... Posted on October 28, 2013 | ... Posted on September 9, 2013 | ... Posted on June 18, 2013 | ... Posted on May 2, 2013 | ... Posted on April 2, 2013 | ... Posted on March 5, 2013 | ...

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• physics | Astronotes - Part 3
• Jupiter | Astronotes - Part 5
• Earth and Moon from Juno spacecraft: image of the month | Astronotes

... Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2000 October 11 . Cassini Spacecraft Approaches Jupiter . Credit: Cassini Imaging Team , Cassini Project , NASA . Explanation: A new spacecraft has entered the outer Solar System: Cassini . Launched in 1997 and bound for Saturn in 2004, Cassini sent back the above image last week while approaching the giant planet Jupiter . ...

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• GALILEO READY FOR CLOSE FLYBY OF JUPITER'S BIGGEST MOON
• APOD: August 16, 1995 - Uranus: The Tilted Planet
• APOD: November 15, 1997 - Uranus: The Tilted Planet

... The unexpected discovery of Jupiter-size planets very close to their parent stars (two examples of which are 51 Peg and Boo) creates a challenge for theories of planetary formation and structure. ... Direct observation of such extra-solar planets with an infrared interferometer is a difficult task because of the very high dynamic range required (typically 3?104 to 3?105), but not impossible if a very careful spatial filtering and calibration is imposed upon the recombined beams. ...

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• Instruments/Observations Overview
• Direct Observation of Extra-Solar Planets with an Infrared Interferometer
• John H. Debes

... There has been a heated public discussion in the past few years about whether our ninth planet is really deserving of the name. Since Pluto orbits a star, and is much less luminous, it certainly satisfies the definition we have above. The problem is actually not with Pluto, but with a very large number of other bodies in our Solar System which also satisfy this definition, but which are not called planets. Perhaps the most notable of these is Ceres, the largest asteroid. ... Planet . ...

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• ASP: Mercury Winter 2011
• ASP: Exploring Venus
• ASP: Star Science in the Autumn Sky

... Tonight's Sky . ... The Magazine . ... Star Atlas . ... An artificial comet holds secrets to Earths life . ... Astronomy for Kids . ... Observing springtime deep-sky objects with a large telescope . ... The planet has extreme temperature swings and perhaps active lava flows. ... A digital supplement to Astronomy magazine. ... Join TravelQuest International with Astronomy and Discover magazines on one of three great tour options surrounding this celestial spectacle . ... Astronomy Magazine . ...

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• NASA's newest Mars mission spacecraft enters orbit around the Red Planet |
• Do the magnetic fields of the planets affect spacecraft during flybys? |
• New mission to take first look deep inside Mars | Astronomy.com

GRANAT is the Russian x-ray sattelite launched to the high apogee orbit (200,000 km) and operated almost for 10 years (1989 -1999) , carrying out four major instruments: French SIGMA coded-mask hard x-ray telescope (30-1000 keV), Soviet ART-P coded-mask telescope (2??-60?? keV), all-sky monitor WATCH (6-150 keV), and a gamma-burst detector PHEBUS . ... Since September 1994, GRANAT is in the survey mode. ... Explore pages devoted to individual GRANAT instruments (including main scientific results): . ...

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. Previous slide . Next slide . Back to first slide . View graphic version .

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• Planet Pictures
• Summary
• ASTR1002 Assignment 1

... Since planets are expected to form out of the material in disks around young stars, the formation of a planet will thoroughly alter the structure of the circumstellar disk of their host star, forming significant gaps in the radial distribution of matter around the star. Additionally, processing of solids (annealing/crystallization) and changes in the overall gas/dust ratio are thought to happen during the planet formation process and are believed to alter the observational signature of the disk. ...