Open clusters and young stars are generally found only in the disk of the galaxy and not in the halo
Indicate whether the statement is true or false
TRUE
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The look-back time is
a. the time it takes for the light from an object to reach Earth. b. numerically equal to the distance in light-years. c. smaller for more distant objects. d. all of the above e. a and b above
Magnifying Glass With the Image at Infinity: A magnifying glass uses a converging lens with a refractive power of 20 diopters. What is the angular magnification if the image is to be viewed by a relaxed eye with a near point of 25 cm?
A. 5.0 B. 3.0 C. 4.0 D. 1.0 E. 2.0
The reason that we observe more distant galaxies to be moving away from us at higher speeds than nearby galaxies is that
A) the more distant galaxies were flung outward faster by the Big Bang. B) the more distant galaxies are smaller and less massive, so they can move faster. C) the nearby galaxies are slowed by our own galaxy's gravitational pull. D) there is more space to expand between us and the distant galaxies.
Sirius is a star with spectral type A and Rigel is a star with spectral type B. What can we conclude?
A) Sirius has a higher core temperature than Rigel. B) Sirius has a higher surface temperature than Rigel. C) Rigel has a higher surface temperature than Sirius. D) Rigel has a higher core temperature than Sirius.