What is the status of current astronomical knowledge regarding their existence (or nonexistence)?
(a) The stars in the star cluster the Pleiades are neutron stars. (b) The star Persei (Algol) is one of the few known neutron stars. (c) Radio pulsars are neutron stars. X (d) Neutron stars are still highly speculative objects; there is considerable indirect evidence for their existence, but a definitive demonstration is not yet available. (e) Neutron stars have been found at the center of massive galaxies. • Which of the following statements gives a correct description of what we mean by stellar evolution? (a) Over a period of millions to billions of years, stars change in luminosity, surface temperature, and chemical composition. The rate and nature of these changes is determined by the stellar mass. X (b) Stellar evolution is similar to biological evolution. In different parts of the galaxy, stars have developed in entirely different ways and are described by quite different physical laws. (c) Stellar evolution refers only to the fact that we see different stars at different distanc
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