Pluto's gravity affects the orbit of Uranus, and this fact was ...

[Lobcity]

Pluto's gravity affects the orbit of Uranus, and this fact was used to discover Pluto.
 
  Indicate whether the statement is true or false

Question 2

The most important fact about a cluster of stars that makes them useful for studying star formation is that
 
  A) all the stars formed from the same cloud.
  B) all the stars formed at about the same time.
  C) all the stars are at the same distance from Earth.
  D) all the stars have the same chemical composition.
  E) all the stars are the same spectral type.

[Amiracle]

Answer to Question 1

FALSE

Answer to Question 2

B