Curious Kids: Why does it matter if Pluto is a planet or a dwarf planet?

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Curious Kids: Why does it matter if Pluto is a planet or a dwarf planet?
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I study the orbits of Kuiper Belt objects and dusty disks in exoplanet systems, mostly using computer simulations.

at forming solar systems far away, but they are so far that it’s really hard to see the planets forming directly.. Planetesimals then grab nearby pebbles, dust and sometimes even smaller planetesimals with their gravity, which gets stronger as they get bigger.

When they get to be a few hundred kilometers across, they have enough gravity to pull themselves into a round shape, which is the The two images at top reveal debris disks around young stars uncovered in archival images taken by NASA’s Hubble Space Telescope. The illustration beneath each image depicts the orientation of the debris disks.

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