Smooth rolling plains, modest highlands and lowlands, and no ...

[ts19998]

Smooth rolling plains, modest highlands and lowlands, and no water describes the surface of ________.
 
  Fill in the blank(s) with correct word

Question 2

Given that white dwarf supernovae are such good standard candles, why don't we use them to measure the distance to all galaxies?
 
  A) They are rare events, so we have observed them in only a tiny fraction of all galaxies.
  B) They can occur only in spiral galaxies, not elliptical galaxies.
  C) We would, but we don't have enough telescopes.
  D) We cannot see them beyond a distance of about 100 million light-years.

[harveenkau8139]

Answer to Question 1

Venus

Answer to Question 2

A