Comets are made of frozen stuff, but I don't know that it was water. Maybe just hydrogen? But yes, water is very common. It's good to know there's some on the moon though; if we can extract usable amounts for a space base, there goes a lot of supply worries.
<!--quoteo(post=1738177:date=Nov 19 2009, 02:27 AM:name=Cereal_KillR)--><div class='quotetop'>QUOTE (Cereal_KillR @ Nov 19 2009, 02:27 AM) <a href="index.php?act=findpost&pid=1738177"><{POST_SNAPBACK}></a></div><div class='quotemain'><!--quotec-->A few effects that allow discovery of exoplanets:
-The Doppler effect. Basically, when a planet orbits its star, the star is very slightly displaced. The resulting speed variation can be seen as a shift in the light spectrum (just like the sound Doppler effect) -"Eclipse". When a large object passes in front of its star, the cast shadow makes a notable drop in the amount of light received. -Gravitational lensing. A object of important mass deviates slightly light beams. Therefore, a star+planet will act as a lens for a source (another star). As the planet revolves arounds its star, the lens properties change.<!--QuoteEnd--></div><!--QuoteEEnd-->
I remember watching a document about exoplanets. In it they described that spotting a planet with the "Eclipse" method is like spotting a firefly in front of a lighthouse lamp, and from a good distance too (can't remember if they compared it to thousands of kilometers).
<!--quoteo(post=1738225:date=Nov 19 2009, 12:20 PM:name=lolfighter)--><div class='quotetop'>QUOTE (lolfighter @ Nov 19 2009, 12:20 PM) <a href="index.php?act=findpost&pid=1738225"><{POST_SNAPBACK}></a></div><div class='quotemain'><!--quotec-->Mainly water. Water is the second-most common molecule in the universe.<!--QuoteEnd--></div><!--QuoteEEnd--> The first of which is, of course, pie.
Comments
But yes, water is very common. It's good to know there's some on the moon though; if we can extract usable amounts for a space base, there goes a lot of supply worries.
-The Doppler effect. Basically, when a planet orbits its star, the star is very slightly displaced. The resulting speed variation can be seen as a shift in the light spectrum (just like the sound Doppler effect)
-"Eclipse". When a large object passes in front of its star, the cast shadow makes a notable drop in the amount of light received.
-Gravitational lensing. A object of important mass deviates slightly light beams. Therefore, a star+planet will act as a lens for a source (another star). As the planet revolves arounds its star, the lens properties change.<!--QuoteEnd--></div><!--QuoteEEnd-->
I remember watching a document about exoplanets. In it they described that spotting a planet with the "Eclipse" method is like spotting a firefly in front of a lighthouse lamp, and from a good distance too (can't remember if they compared it to thousands of kilometers).
The first of which is, of course, pie.
He said molecule.
Molecules are what you get when you put two atoms together.
Molecules are what you get when you put two atoms together.<!--QuoteEnd--></div><!--QuoteEEnd-->
You fell for it. Bad luck. I knew he was baiting someone into saying "DURRR HYDROJEN IZ A ELEMENT U NONCE LOL!"
--Scythe--
The symbol for Pi is π...
Suspiciously similar.