Although we cannot see the stars during the day, there are just as many stars overhead. Saturn is much larger than Mars, and much more reflective than Mars. The shadow we normally see on the Moon flips sides because the Moon has moved to the other side of Earth after Full Moon, with respect to the Sun, thus Earth's shadow falls on the opposite side of the Moon. True or false, explain. Switching sides with respect to the Earth-Sun line causes us to see the other side of the Moon's shadow.
Observatories are on mountaintops to get the astronomers closer to the planets and stars.
True or false, explain. The highest mountain on Earth would not make any appreciable difference to the distance to celestial objects. Observatories are on mountaintops to get the instruments to the clearest, thinnest, most light-pollution free air. A futuristic astronaut releases two small wooden blocks in space, several miles apart, when she is millions of light years from the Milky Way and other galaxies. The blocks have no measurable motion relative to one another.