"Would it be possible to find a planet in another solar system, that has plant life much like ours but with no animal species."
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Question
What were the conditions of early Earth like?
What sort of conditions did you have in mind, and when? A planet is a big place with different conditions in different times and places. Some parts were hot and some cold, ranging from volcanic lava to ice sheets. There was an ocean but we are not sure how salty it was. There was land but it probably was much smaller than the continents of today. Earth had a thicker atmosphere than today that probably contained large amounts of carbon dioxide, perhaps some methane, and no oxygen. You should think about just what aspects of the early Earth interest you.
David Morrison
NAI Senior Scientist
July 25, 2005
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