Two Newly-Discovered Exoplanets are Probably the Result of a Catastrophic Collision

Two Newly-Discovered Exoplanets are Probably the Result of a Catastrophic Collision

How can two planets so similar in some respects have such different densities? According to a new study, a catastrophic collision may be to blame. In our Solar System, all the inner planets are small rocky worlds with similar densities, while the outer planets are gas giants with their own similar densities. But not all …

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