The great Andromeda galaxy owes a bit of its beauty to a dalliance with another galaxy billions of years ago, according to new data gathered with NASA's orbiting Hubble Space Telescope.
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常见的数据模型有:星形模型、雪花模型、星座模型、雪瀑模型等。
Common data model: astrocytoma model snowflakes model, Constellation model, snow waterfall model.