In what part of spiral galaxies do new stars form?
A) In the bulge.
B) In the spiral arms.
C) No new stars are forming anywhere.
D) In the halo.
E) No new stars form inside spirals. They form outside the galaxy and are pulled in.
Ans: B) In the spiral arms.
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We can describe a position on Earth's surface by stating its
A) altitude and azimuth. B) altitude and direction. C) latitude and direction. D) latitude and longitude. E) meridian and longitude.
A 4.00 kg ball is moving at 4.0 m/s to the right and a 6.00 kg ball is moving at 3.00 m/s to the left. The total momentum of the system is
A. 16 kg m/s to the right. B. 2.0 kg m/s to the right. C. 2.0 kg m/s to the left. D. 18 kg m/s to the left. E. 34 kg m/s to the left.
The inability to observe parallax of stars contributed to the ancient Greek astronomers' rejection of the idea that Earth revolves around the Sun.
Answer the following statement true (T) or false (F)
How massive are the largest known galaxies?
A) a few million solar masses B) a hundred million solar masses C) a few billion solar masses D) a trillion solar masses E) hundreds of trillions of solar masses