This looks at our galaxy and compares its size to the size of the largest known galaxy. Also comparing some others in-between, such as Andromeda, our closet ...
Recent studies have shown that there are over 1000 planets that are potentially within their star's habitable zones. That's a lot more than previously assumed. And that's only from preliminary results.
The fact is that we are only starting to be able to detect Earth-size planets. Previous methods required planet sizes that made them gas giants
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