What must be true in order for astronomers to be able to use the ...

[lb_gilbert]

What must be true in order for astronomers to be able to use the Doppler technique to determine a planet's mass?
 
  A) The planet's orbit must be viewed nearly edge on.
  B) The planet must have a very low mass.
  C) The planet must have a very eccentric orbit.
  D) The planet's orbit must be seen nearly face on.

Question 2

How will an isolated, one solar-mass star die?
 
  A) as a neutron star
  B) as a black hole
  C) as a white dwarf supernova
  D) as a white dwarf
  E) uncertain, since stars can die in any number of ways

[fur]

Answer to Question 1

A

Answer to Question 2

D

[lb_gilbert]

Excellent

[blakcmamba]

TYSM