Question
The Crab Nebula is 6,300 ly away. The supernova that formed it was observed from Earth in 1054 A.D. When, in fact, did thesupernova event occur?
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The Crab Nebula is 6,300 light-years away from Earth. Show more…
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The Crab Nebula is a test of our ideas about supernova explosions because a. the system contains an x-ray binary. b. the nebula is slowly expanding. c. the supernova was observed in 1054 and now astronomers see a pulsar in the nebula. d. the original star was like the Sun before exploding.
The Type II supernova that created the Crab Nebula was seen by Chinese and Arab astronomers in the year 1054 CE.The radius of the nebula is now 5.5 light-years, so the average expansion has been about: a. $15 \mathrm{km} / \mathrm{s}$ b. $150 \mathrm{km} / \mathrm{s}$ c. $1,500 \mathrm{km} / \mathrm{s}$ d. $15,000 \mathrm{km} / \mathrm{s}$
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