The Crab Nebula Is an Important Test of Our Ideas

question 7

Multiple Choice

The Crab Nebula is an important test of our ideas about supernova explosions because

• A) people saw the supernova and later astronomers found a pulsar inside the nebula.
• B) the system contains an X-ray binary.
• C) the nebula is expanding slowly, as expected from mass-loss rates in massive stars.
• D) the original star must have been like the Sun before it exploded.
• E) astronomers observed the merger of the two stars.

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