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

Simulation of a collision between two 10 Earth-mass planets. Image Credit: Zoe Leinhardt and Thomas Denman, University of Bristol

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 solar systems are like ours.

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