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发帖数: 1994 | 1 The Pencil Nebula Supernova Shockwave
Credit: Hubble Heritage Team (STScI/AURA), W. Blair (JHU) & D. Malin (David Malin
Images), NASA
Explanation: At 500,000 kilometers per hour, a supernova shockwave plows through
interstellar space. This shockwave is known as the Pencil Nebula, or NGC 2736, and is part of
the Vela supernova remnant, an expanding shell of a star that exploded about 11,000 years
ago. Initially the shockwave was moving at millions of kilometers per hou |
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