Astronomy final exam (had to put biology) 1. the counter-clockwise spin of a planet or moon as seen from above the planet's north pole is known as: a. prograde rotation b. retrograde rotation c. proplyd d. fusion 2. the solar system is the sun, planets, moons, and related objects that orbit the sun. a. protoplanets b. asteroids, comets c. galaxies d. this sentence is already complete as it is. 3. when do sunspots disappear? a. sunspots are always present and never disappear. b. once the magnetic field weakens in the area and cold plasma enters the area of the sunspot. c. once the magnetic field weakens in the area and hotter plasma enters the area of the sunspot. d. once the magnetic field strengthens in the area and the hotter plasma enters the area of the sunspot. 4. photosphere is the: a. lowest layer of the sun's atmosphere. b. the hi