Comet dust looks like asteroid dust

Until quite recently, astronomers thought that comets formed in the outer reaches of the solar system and then were drawn into highly elliptical orbits that pass near the sun. But samples collected from comet Wild 2 look more like they came from the inner solar system like asteroids. Maybe the outer solar system is more like the inner solar system, or maybe comets didn’t form where we thought they did.

For more details, listen to yesterday’s 60-Second Science podcast or read the Science Magazine article the podcast is based on.

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