What can we infer, at least roughly, from a star's luminosity ...

[fahad]

What can we infer, at least roughly, from a star's luminosity class?
 
  A) its age in years B) its surface temperature
  C) its size (radius) D) its mass

Question 2

Galileo challenged the idea that objects in the heavens were perfect by ________.
 
  A) observing sunspots on the Sun and mountains on the Moon
  B) inventing the telescope
  C) proving Kepler's laws were correct
  D) showing that heavy objects fall at the same rate as lighter objects

[shewald78]

Answer to Question 1

C

Answer to Question 2

A