Planets orbiting stars beyond the solar system come in all shapes and sizes but mostly fit into a few categories: large and hot gas giants, super-Earths that are slightly larger than our planet, ...
来自MSN
Is this where aliens are hiding? NASA discovers an exoplanet that's remarkably similar to Earth
It's one of the biggest unanswered questions in science: are there aliens out there, and if so, where are they hiding? Now, a discovery by NASA has raised the tantalising possibility that we're not ...
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