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Politics : The Trump Presidency -- Ignore unavailable to you. Want to Upgrade?

To: Katelew who wrote (35100)	9/14/2017 2:38:50 PM
From: bentway	Respond to of 358065

Geez! You really need to catch up on what we've learned about our universe. A good place to start becoming humble is HERE: hubblesite.org We've learned more in the last 50 years than we did in all of human history. Galaxy M51, one of billions:

To: Katelew who wrote (35100)	9/14/2017 5:27:42 PM
From: combjelly	Respond to of 358065

It sort of depends on how you define "vegetation". The land was initially colonized by cyanobacteria. Regardless, it all started in the oceans. The original photosynthetic bacteria used rhodopsin as the pigment. This is the same pigment that you use to see black/white when it is dark. Chlorophyll absorbs the light spectrum that rhodopsin isn't efficient in. Which is why rhodopsin is sort of red-purple and chlorophyll is green. Here is a decent rundown of the progression. course-notes.org Note that 500 million years ago was about the time of the Cambrian Explosion. There was finally enough oxygen in the atmosphere that complex life could evolve and there was a bewildering diversity in the fossil record. The Burgess Shale was where we made the first discoveries of that. As to the formation of the Moon, look here. en.wikipedia.org