1. Why is 250 million years called a cosmic year? a. That’s the amount of time it takes the solar system to rotate on its axis.
b. That’s the amount of time it takes the Milky Way to revolve around the Universe core.
c. That’s the amount of time it takes the Milky Way to rotate on its axis.
d. That’s the amount of time it takes the solar system to revolve around the Milky way core.
2. Why are comets icy bodies?
a. They cluster in streams.
b. They orbit the Sun between Mars and Jupiter.
c. They lose heat as they fall through Earth’s atmosphere.
d. They originate in areas beyond Neptune