An observer at Earth's geographic north pole would find _______
a. the celestial equator passing at 45 degrees above the northern horizon.
b. the celestial equator passing at 45 degrees above the southern horizon.
c. that the celestial equator coincides with the horizon.
d. the celestial equator passing directly overhead.
e. None of the other choices are true.
c
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Suppose that Earth's ice caps melted, but everything else about the Earth's surface and atmosphere stayed the same. What would happen to Earth's average surface temperature?
A) The surface temperature would increase. B) The temperature would not be affected at all. C) The surface temperature would decrease. D) The surface temperature would change radically, until it was equal to the melting temperature of ice.
Pulsars are thought to be ________
A) unstable high-mass stars B) accreting black holes C) rapidly rotating neutron stars D) accreting white dwarfs
Contrast finding the distances to seventh magnitude M3V and M3Ib stars
What will be an ideal response?
A speedometer registers ______________
Fill in the blank(s) with correct word