... With enough velocity, a spacecraft can break loose from the Earth's gravity and enter an orbit around the Sun, like that of a planet. If it then orbits the Sun with the same period as the Earth--one year--it may keep a fixed position relative to Earth. ... If the distance is just right--about 4 times the distance to the Moon or 1/100 the distance to the Sun--the spacecraft, too, will need just one year to go around the Sun, and will keep its position between the Sun and the Earth. ...

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• The Earth's Magnetosphere

... ATNF Home . ... About ATNF overview . ... Australia Telescope Steering Committee . ... Murchison Radio-astronomy Observatory . ... Parkes radio telescope . ... Parkes | ... Cosmic engine for senior students . ... The Sun . The Sun is vital for life on Earth. ... The Sun is a typical star, emitting electromagnetic radiation and particles that influence the Earth . ... In the meantime you can view material on the Sun and its influence on Earth written for the first version of the new syllabus here . ...

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... Jay Apt (Ph.D.) . NASA Astronaut (Former) . ... PUBLICATIONS: Dr. Apt shared his images and knowledge in the publication Earth in Orbit : NASA Astronauts Photograph the Earth , written in conjunction with NASA scientists Michael Helfert and Justin Wilkinson and published by the National Geographic Society. ... From 1976 to 1980 he was a staff member of the Center for Earth & Planetary Physics, Harvard University, supporting NASA s Pioneer Venus Mission by making temperature maps of Venus from Mt. ...

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25. Earth Gallery

26. SAO RAS home page

27. Astronomy links

28. Новости астрономии, форум любителей астрономии - Общая Астрономическая

29. Phil Plait's Bad Astronomy: Misconceptions

30. A timeline for NASA's Chandra X-ray Observatory

31. Spacecraft 'Aist-2D' can be 'seen' through the earth

32. East Siberian Center for the Earth's Ionosphere Research. Capabilities and

33. В Google Earth появились самые свежие снимки Марса

34. Moon in Google Earth - Астрософт

35. The national Earth remote sensing spacecraft of Ukraine will be placed into

36. earthe

37. http://www.astrosociety.org/events/2011mtg/posters.pdf

38. Remote Sensing of the Earth and Atmosphere. IRE RAS

39. Pictures, information about some cities

40. SAI MSU: Gravimetry Division