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HD 172555 System

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Exoplanetary Scratchpad

[SysBP Img]

A star in the Beta Pictoris moving group in which a collision between two small planets took place about a few thousand years ago. One planet is thought to be the size of Mercury, while the other the size of the Moon. Signatures of refrozen lava and vaporized rock were picked up by the Spitzer Space Telescope at about 5.8 AU.

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Planetary Collision Aftermath Detected (2009)

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