Top Definition
a group of stars belonging to a dwarf galaxy that was devoured by the Milky Way Galaxy in a phenomenon called galactic cannibalism.
Scientists have recently discovered a Jupiter-sized planet belonging to the Helmi stream.
by uttam maharjan November 20, 2010

The Urban Dictionary Mug

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The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

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The Urban Dictionary Mug

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