Recent discoveries of two types of brown dwarfs have placed these stars near which spectral type of star?
a. hotter than O stars
b. cooler than O stars
c. hotter than M stars
d. cooler than M stars
e. at exactly the same level as G stars
d
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How long does the protostellar stage last for a star like our Sun?
A) 1 million years B) 3 million years C) 10 million years D) 30 million years E) 100 million years
A nova is a new star
a. True b. False Indicate whether the statement is true or false
Suppose we want a satellite to revolve around the earth 5 times a day. What should be the radius of its orbit? (The mass of the earth is 5.97 × 1024 kg, G = 6.67 × 10-11 N ? m2/kg2, and you can neglect the presence of the moon.)
A) 1.44 × 107 m B) 0.690 × 107 m C) 7.22 × 107 m D) 2.11 × 107 m
Tonight, your telescope shows you RXJ1800, a galaxy, very near in the sky to the bright star Vega. What can you conclude from this observation?
A) Vega and RXJ1800 must be very close to each other, less than a few light years. B) RXJ1800 and Vega will drift apart from each other on the sky, over a matter of nights. C) Vega orbits the center of mass of RXJ1800. D) RXJ1800 and Vega will set in the west, at very similar times.