Author Question: What did Carl Sagan mean when he said that we are all star stuff? A) that the Earth formed at the ... (Read 75 times)

lindiwe · **on:** Jul 27, 2018

What did Carl Sagan mean when he said that we are all star stuff?

A) that the Earth formed at the same time as the Sun
B) that the carbon, oxygen, and other elements essential to life were created by nucleosynthesis in stellar cores
C) that life would be impossible without energy from the Sun
D) that the universe contains billions of stars
E) that the Sun formed from the interstellar medium: the stuff between the stars

Question 2

When we see a region of a planet that is not as heavily cratered as other regions, we conclude that

A) the planet formed after the age of bombardment and missed out on getting hit by leftover planetesimals.
B) the surface in the region is older than the surface in more heavily cratered regions.
C) the planet is rotating very slowly and only one side was hit by impactors.
D) the surface in the region is younger than the surface in more heavily cratered regions.
E) there is little volcanic activity to create craters.