Contrast the brightest stars of young open and old globular clusters
What will be an ideal response?
Hot blue main sequence stars light up young open clusters, but the aging globular clusters have long since lost such short-lived massive stars; they have red giants as their brightest, most evolved survivors.
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The diagram shows a plot of the temperature of the sun as a function of distance above the bottom of the photosphere. At what distance above the bottom of the photosphere is the temperature of the sun the smallest?
a. 1000 km
b. 2300 km
c. 2500 km to 4000 km
d. 500 km
e. a and c
An astronomer examining a compact object could conclude that it was a black hole if it _____
a. emits regular pulses of radiation b. has a defined event horizon that emits X-rays c. has an accretion disk d. has a mass greater than 1.4 solar masses e. has a mass greater than 3 solar masses
The gravitational field around close binary stars is defined by _______________ lobes
Fill in the blank(s) with correct word
For light bulbs of different wattages connected in a series circuit, the _______ will be the same for each when ON
a. current b. voltage c. power d. resistance