A nebula an interstellar cloud of dust, hydrogen gas, helium gas and plasma.
星云是由尘埃，氢气，氦气和等离子体构成得星际云团。
Today, the Crab Nebula is still expanding and it will eventually dissolve in the interstellar gas cloud nearby.
蟹状星云仍然在膨胀最终会溶入星际物质而消散。
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