In the closed universe model, the geometry of spacetime in two ...

[tfester]

In the closed universe model, the geometry of spacetime in two dimensions resembles the surface of a
 
  A) saddle.
  B) cylinder.
  C) flat piece of paper.
  D) pyramid.
  E) sphere.

Question 2

On our Moon, Mercury, Earth, and Mars, there are a variety of meteor craters in terms of size. Yet all those found on Venus are over 5 kilometers across. Explain.
 
  What will be an ideal response?

[bookworm410]

Answer to Question 1

E

Answer to Question 2

The atmosphere of Venus is much thicker, so that only the largest asteroids (probably at least a kilometer across) can survive the fiery transit of this dense atmosphere and arrive intact at the surface to create such damage. Only the strong survive.

[tfester]

Excellent

[adammoses97]

Gracias!