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If everything in our solar system formed from the same solar nebula, why do the planets have different compositions? Herbert WichTitusville, Florida To better understand why the planets have variable ...

Today, the belt extends between 30 and 50 times the distance between Earth and the sun, but in the early solar system, the proto-Kuiper Belt lay much closer to the sun. Related: Lost photos ...

In other words, Bennu's samples provide further evidence that life's building blocks formed early in the solar system and ...

"In previous models, when proto-Charon hit proto-Pluto ... between each other but didn't lose a lot of material to the solar system. Pluto is bigger and started and ended up with much more ...