Previously asked. Here is DizzyGill's answer:Well it depends, different satellites will have different orbit heights base on how they need to be used. Sun-synchronous satellites orbit at approximately 525-530 miles and orbit about ever 100 minutes. They collect environmental data and can collect complete global data a couple times a day. Then there are geo-synchronous satellites that orbit from between 22,000 to 22,500 miles, and are used from co-operative efforts like with EUMETSAT, or for national needs of the country running them (like India).Also, go here: http://en.wikipedia.org/wiki/Satellite Source(s): http://answers.yahoo.com/question/index?… 5 years ago 1 person rated this as good Good stuff.. thanks everybody…Error processing request

- Chosen by Voters There's atmosphere on Earth, while space is mostly vacuum. Gravity is unaffected, but an airplane will have no use for its wings or propellers. 1 year ago 100% 1 Vote 1 person rated this as good

The Space Aliens, duh. Source(s): Christians annoy me. 5 years ago 2 people rated this as good ty

- Chosen by Voters Fun question. The earth rotates completely on its axis once every 24 hours, approximately, as I am sure you know, so there is that velocity. Then, the earth revolves around the sun once every 365.25 days, approximately, so add that velocity, and of course the solar system is moving relative to theMilky Way's central massive black hole, and the Milky Way moves in its galactic cluster relative to some datum there, and so this is not a very simple question to answer. But it is provocative. To really nail an answer down to your question, one would have to add a datum, so your question might say, "How fast…relative to the Sun?' Hope this helps. 3 years ago 67% 2 Votes 1 person rated this as good

Gravitational force increases with descent but it is not valid to think that it doesn't exist simply because the astronauts appear weightless in *freefall*. If there was no gravity the shuttle would not remain in orbit. It is gravity that keeps the shuttle (and the Moon) circling the Earth.There is not much difference between the actual strength of gravity 200 miles or so up and the surface or our world when measured as a specific acceleration rate of 32 ft/sec. I do not know the exact reduction but it is still a significant percentage of 32 ft/sec.The shuttle appears weightless because in *freefall* the vessel is falling around the Earth in an orbit that roughly equals gravitational acceleration and *zeros* out. You can even experience a similar moment of this on the surface when an elevator falls so fast that you feel lighter.So technically it remains *almost constant* but is diminished (or increased on approach) in accord with Newton's inverse square law for the reduction of gravitational force as measure of distance from the source, which in astronomical terms is almost negligible at 200 miles.BTW gravity does not change that much in that distance but how strongly it is felt will increase significantly with descent and deceleration. 4 years ago awesome

- Chosen by Voters Right now there is too much dark matter to see that far back. Some objects are so massive and "bright" that they emit enough light to reach us but we can't tell if their redshift is due to their distance or their mass. 3 years ago 100% 3 Votes

I don't Source(s): I am An Astronomer 3 years ago i too don't agree on this.

The term "floating" does not accurately depict earth's motion through space. "Floating" gives the impression that you think that the earth is randomly moving in space and being buffetted this way and that by anonymous forces. The earth is under the gravitational influence of the sun, the nearest star to us. It travels revolves around the sun every 365.25 days. At the same time it is turning on its axis every 24 hours.In turn, the sun (and the earth and other planets) are revoving around the center of the Milky Way (our Galaxy). Our Galaxy and its local Galaxy's are moving away from the big bang at tremendous speeds in an ever expanding universe. So while the earth is in "space" it is not floating but moving rapidly as part of several systems that are all governed by the laws of physics. 4 years ago 2 people rated this as good hey wow you very smart, and now i dont have to worry about this question anymore… thanx

- Chosen by Voters Oh I certainly believe that there are some flying objects which are unidentified. That doesn't necessarily prove they're of extraterrestrial origin, nor does it disprove it.As to abductions and visits, THOSE would require more proof for me. Earth is a quarantine, huh? Quarantined by whom and for what purpose? How would that be performed? Seems to me that we've already tossed a significant number of spacecraft some distance from Earth, and many still work exactly as designed. Wouldn't a quarantine include such vehicles as well? 5 years ago 40% 2 Votes

There has been extensive research into guns that would be capable of launching a satellite. That research is pretty much dead in the water right now for two reasons. The velocity of the projectile would have to exceed 25,000 miles per hour (about 37,000 fps) to break free of the earth's gravitational pull. There are currently no propellants that would generate that kind of power. The second reason why research is currently on hold is that the satellite's electronics are not robust enough to withstand the G-force generated when they are fired. 1 year ago 1 person rated this as good .