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nebula space universe galaxy stars astronomy science natural beautiful spectacular 浩瀚 无垠 mysterious fantasy gorgeous colorful 斑斓 dazzling 耀眼 light 灿烂 twinkling starlight dust gas energy gravity black hole white dwarf neutron star supernova planet 恒星 comet 陨石 stardust interstellar Milky Way galaxy cluster galaxy group cosmic microwave background radiation dark matter dark energy expansion contraction evolution origin fate