Black holes are real holes?
本文作者： teens
黑洞是真的洞吗？Black holes are not really holes in space. A black hole form (形成) when a star collapses (崩塌). A black hole is a dying (垂死的) star. It has strong gravity (重力). It can pull things close to it. Even (甚至) light can’t get out. |  |
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