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... tendency to speed off in a straight line, and Earth's attraction, which results in pulling the spacecraft back into a circuit of the Earth. At the lowest orbital altitudes, there are some very thin traces of atmosphere which will eventually cause a satellite's orbit to drop lower. Beyond this low orbit regime, a satellite can remain in orbit forever ...

... ,000 satellites in orbit. Around ten countries have launched satellites, but often a country will have a satellite launched on someone else's rocket. There are about 20 countries with satellites in orbit. ---- Answer ...

... very steady in orbit. Periodically, however, it must propel itself back up to the preferred operating altitude that gradually decreases because of the influence of the small amount of atmospheric gas in the ...

Media:1962_Tiesenhausen_Engineering_problems.pdf Engineering Problems in Orbital Operations by Georg von Tiesenhausen (1962) Category:Publications

... the British Interplanetary Society for Volume 54 54 '''Page ''' - 147-152 '''Year''' - 2001 '''Keywords''' - Jupiter, Galileo mission, Europa, water, life '''JBIS Reference Code ''' - 2001.54.147 '''Number of Pages''' - 6 Abstract ... NASA Galileo orbiter since it arrived at Jupiter in December 1995. This paper discusses some of the results to date, with emphasis on those which may be relevant to any possible exobiological activity in ...

... orbit and to maintain a space orbit. There is a range of speeds at which the different satellites travel. Because of the laws of physics, the faster we travel the higher up in space we are. So if we want to put a satellite in a different orbit, we make sure that it has different speeds ...

... rocket fuel and the rockets continue to function properly, a space station can continue to orbit for decades, or longer. But operational, political, or financial considerations could require that it eventually ...

Yes, comets orbit the Sun just as the planets and the asteroids do. ---- Answer provided by Alan Hale, ...

No. Pluto's orbit is very stable now. Neptune's moon, Triton, is probably a Pluto-like object that ...

... and heart rate while resting should be the same as resting on Earth. While exercising in space, the heart beats faster for each level of work, so if riding a bike ... Earth causes the heart beat to rise to 100 beats per minute, the same effort in space may cause the heart beat to rise to 140 beats per minute. ---- Answer provided ...

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