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Thus the end result of a supernova may be a pulsar. And in fact, astronomers have found a pulsar at the center of the Crab Nebula. is Figure 1-40 The Crab Nebula formed from the supernova explosion of a dying star. M 47 -:^^S53^ Black hole Star Neutron star (dead star) formation White dwarf Figure 1-41 The fate of a star depends on its mass when it first formed. The sun is a low-mass star that will one day become a white dwarf and finally a dead black dwarf. The neutron star in the Crab Nebula pulses at a rate of about 30 times a second.

If the sun were hollow, more than 1 million planet Earths could Although the sun's volume is more than times greater than that of Earth, one quarter that of Earth. its fit 1 density Why do you inside it! million is only think the Earth is more dense than the sun? Since the sun is made only of gases, there are no clear boundaries within it. But four main layers can be distinguished. Three layers make up the sun's atmosphere, and one layer makes up its interior. See Figure 1-29. Figure 1-29 The three main layers of the sun's atmosphere are the corona, the chromosphere, and the photosphere.

Would burn would extend well to replace the sun. It Earth to cinders; in fact, it M 29 beyond planet Mars. Supergiants, however, pay a price for their huge size. They die off quickly and (^AREERg are the shortest-lived stars in the universe. Not all stars are larger than the sun. Some, such even smaller than Earth. The smallest known white dwarf, Van Maanen's star, has a diameter that is less than the distance across the continent of Asia. The smallest stars of all are called neutron stars. A typical neutron star has a diameter of only about 16 kilometers.

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