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Thomas Page

Jun 18, 2010 from

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Retrograde Motion http://highered.mcgraw-hill.com/olcweb... , pstp space geo astro 6 -18 http://en.wikipedia.org/wiki... , Retrograde Motion and the Opposition of Mars http://www.youtube.com/watch... , Mars in Retrograde Motion http://www.youtube.com/watch... - Thomas Page

Length of Planet Earth's Days & Nights (visualization) http://www.cs.sbcc.cc.ca.us/~physic... , geography seasons http://www.youtube.com/watch... , 4 -9 http://www.solarsystemscope.com/ - Thomas Page

Interception of Asteroids http://en.wikipedia.org/wiki... http://en.wikipedia.org/wiki... http://en.wikipedia.org/wiki... http://en.wikipedia.org/wiki... http://en.wikipedia.org/wiki... [ http://en.wikipedia.org/wiki... [ sort http://theses.gla.ac.uk/1819/ http://www.spacedaily.com/reports... http://en.wikipedia.org/wiki... [ 2 -15 It is estimated that, if it were to impact Earth, it would enter the atmosphere at a speed of 12.7 km/s, would have a kinetic energy equivalent to 3.5 megatons of TNT,[4] and would produce an air burst with the equivalent of 2.9 megatons of TNT[14] at an altitude of roughly 8.5 kilometers (28,000 ft).[14] The Tunguska event has been estimated at 3−20 megatons.[15] Asteroids of approximately 50 meters in diameter are expected to impact Earth once every 1200 years or so.[16] Such an impact could be a city-killer, as asteroids larger than 35 meters across can pose a threat to a town or city. speed of 12.7 km/s , 2 -18 http://www.wired.com/dangerr... , http://ogleearth.com/2013... - Thomas Page

. - Thomas Page

Back in the 1980s, space agencies were racing to Halley's comet. But NASA wasn't going — officials said a comet mission was too expensive. That did not sit well with Farquhar, who had dreamed of achieving the first comet encounter ever. So he figured out how to divert an existing satellite, called the International Sun-Earth Explorer-3 (ISEE-3) http://en.wikipedia.org/wiki... , that was stationed between the Earth and the sun in an innovative halo orbit http://en.wikipedia.org/wiki... that he had pioneered. Farquhar came up with a complicated trajectory that would let this spacecraft intercept a different comet called Giacobini-Zinner in September of 1985, months before the armada of other space probes would arrive at Halley's. http://www.npr.org/2014... http://www.skyandtelescope.com/astrono... [[ 4 -21 http://xkcd.com/1356/ kerbal space program http://en.wikipedia.org/wiki... 6 -16 http://www.nytimes.com/2014... 6 -20 http://www.theatlantic.com/technol... http://www.spaceref.com/news... - Thomas Page

11 -16 Orbit - Thomas Page

. - Thomas Page