We wouldn't expect to find life on 51 Eridani b, even if were the size of Earth and at the right distance from its star.
The planet is only a bit over 20,000,000 years old.
At that point in our home's long story, the earliest critters wouldn't appear for at least another several million years.
We've discovered thousands of new worlds so far, some a bit like Earth, most not; and many not like anything in our Solar System.
Scientists are starting to make sense of what's being found, and discovering that we have a very great deal left to learn.
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