Quote:
Originally Posted by neilzero
Earth likely was not blue until one or two billion years ago. From Mars, Earth is now sometimes brighter than Venus, and appears larger about 60% of the time. Earth's Ice caps extended from the poles to about 45 degrees, so the torid zone and half of the North and South Temperate zones have been green even at the ice age maximums. Neil
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After I saw, "How the Earth was Made", I briefly thought of this story had how Earth probaly had green oceans for the first two billion years.
There were two instances, of a suspected total glaciation, two BYA and 600MYA.
I've also learn a bit more about Mars in the year since I wrote this. Mars was Earth-like for at least 800MY to 2BY after it was formed and for its size, had more water than Earth. On warm, stable Earth, it took 3.5BY for like to eventually evolve into multi-cellular organisms right after a period of total glaciation, so, since Mars experienced rather frequent glaciations, perhaps multi-cellular life was kick started very early on the Red World...and perhaps intelligent life made it to Earth and accidently contaminated Earth...