mars??????

Question

has any one visited mars...? i mean how r scientist so sure theres water on mars??? and where else r they planning to go?? i mean i heard on jupiters moon.....? is that true?

Answer 1

There were 2 rovers in 1975, another one in 1996, and right now there are 2 rovers exploring Mars (have been there and active for over 3 years).
Scientists have all kinds of instruments (infrared, ultraviolet, deep radar, spectrographs, etc.) that can analyse Mars from orbit as well as from data reported by the rovers. So they are pretty sure there is frozen water under Mars' surface (about a kilometer below the surface), there are signs of frozen water at the poles, as well as indications of recent liquid water on the surface (for short periods of time, since it would evaporate quickly in the low pressure).

Jupiter's moon Europa has a frozen ice surface and likely liquid water a few kilometers below the icy surface (from all kinds of instruments and analysis from data from the Cassini and New Horizons missions as they flew by Jupiter on their way to Saturn and Pluto).

Answer 2

This summer, as part of an annual meeting of astronomers, I went on a tour with geologists who showed us how they can tell that a region was under water thousands of years ago, or that there was a raging river, there, thousands of years ago, even though the land is now far above the surrounding terrain and very dry.

The signs they look for are easy to see AFTER you have been told what to look for. They look for such signs, they do try to find other explanations for them (other than water in the past).
Once they have eliminated all the other possible explanations, they conclude that water is the cause of what they see.
In some places, the signs are so obvious that it is difficult to imagine anything but moving water as the cause.

They use the same kind of knowledge and deduction on the photos taken by the rovers (making allowance for the different conditions on Mars, where other causes could exist).

What they conclude is not "we are sure that there was water", but rather: "We have looked for all the known causes that could have explained this, and the only one that works is water."

Whenever a scientist makes such a bold statement: "I claim that there was water in this spot because I see these signs and I have eliminated other known causes", other scientists try very hard to find even more other causes, to challenge the claim.

Therefore, the theory that there was water on Mars had to survive many challenges before it became popular among scientists.

Even at that, scientists accept that there is still a small probability that it could be something else, but that probability is very small. It is much easier to understand a lot of what is seen if we accept that water could have existed on Mars.

Answer 3

No one has physically visited Mars and although water has not been actually discovered there there is evidence of water in action in the past and present on Mars. A series of photographs taken of a particular crater on Mars by the NASA Mars Planetary Orbiter shows recent movement of the crater edge by a liquid which is no doubt water. Most of the water that may be on Mars is frozen or beneath the surface.
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Jupiter itself is not a destination in itself because experts think it's a gas giant and has no actual surface to stand on but a few of the Moons of Saturn (another gas giant) and Jupiter are more like the inner rocky planets than the planets they circle. Europa is covered with ice and it is thought that internal heat causes the Moon to be totally covered with water to unknown depths.
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Answer 4

Haven't you heard of the two Mars rovers that are up there now?

Answer 5

no people have ever been on mars. they have found ice on mars with the mars rovers. there is no liquid water that we know of, only ice.