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Often I see news articles claiming astronomers found exoplanets with water. If we are capable of detecting water on such distant objects, why don't we employ similar methods to find water on Mars or Titan moon?

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We can look up for water in the atmosphere of the planet, not at the planet itself. We can do that when a planet passes in front of a star. That tehnique is called transmission spectroscopy.

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  • $\begingroup$ I initially flagged this answer as spam. Why did you originally type out nonsense? $\endgroup$ – HDE 226868 Sep 25 '14 at 17:57
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    $\begingroup$ Sorry, my phone stucked for a moment $\endgroup$ – user2481 Sep 25 '14 at 17:57
  • $\begingroup$ Ahhhhh. My apologies. I've seen a lot of nonsense answers on SEs before, and I try my best to help get rid of them. Note to whichever moderator sees my flag: I retract it. By the way, the downvote was automatically triggered by the flag; I don't know how to remove it manually myself, but it should be removed when the flag is rejected. Again, my apologies. $\endgroup$ – HDE 226868 Sep 25 '14 at 17:59
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    $\begingroup$ @HDE226868, I guess, you can just upvote. To the answering user, it would be nice if you can argue a bit your answer, and give some references. $\endgroup$ – Py-ser Sep 26 '14 at 0:59
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    $\begingroup$ @jorel We can do that with Mars as well, but because Mars and Venus are close to us, we are not limited just to Earth-based observations. We can send a probe to do all the science in situ, as the matter of fact, freshly arrived MAVEN examines martian atmosphere as we speak. $\endgroup$ – user2481 Sep 26 '14 at 21:28

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