Humans have been looking to stars and wondering if we are alone out there for as long as we have recorded history. Modern science edges closer to this question, finding planets that orbit similar stars to our own, and planets in similar place to our own.
But what would life look like?
Would we even know it if we found it?
In order to understand these questions we need to look to the one planet we know has life on it – Earth. In this lesson, we will investigate what life could look like on another planet, both as living organisms and fossil evidence, and try to use this evidence to make inferences about what life needs to exist on another planet and what it could potentially look like.
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