Which of the following is true of ancient constellations?
A) Out of all the ancient constellations, over 150 constellations are still in use.
B) Ancient constellations were a grouping of bright and fainter stars.
C) Ancient constellation boundaries, when they were defined at all, were only approximate.
D) All the regions of the northern and southern sky were identified as constellations by ancient astronomers.
C
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If Mars had liquid water on its surface in the distant past, then its atmosphere must have been ________ than it is now.
A. denser B. warmer C. wetter D. All of these choices are correct. E. None of these choices is correct.
What is buoyancy?
What will be an ideal response?
Two stars, A and B, have the same emissivity, but the radii and surface temperatures are different with RA = 0.5RB, and TA = 2TB. Assuming the temperature of space to be negligible, which star radiates the most energy per unit time?
a. Star A b. Star B c. Both radiate the same amount of energy per unit time. d. More information is needed in order to make a determination.
Why do Jupiter, Saturn, Uranus, and Neptune all have rings?
a. They were left over from solar system formation. b. They all captured particles. c. All four planets had a large moon that disintegrated. d. All have small moons and orbiting particles that constantly collide and make rings.