You are measuring how velocity changes with time of two stars ...

[serike]

You are measuring how velocity changes with time of two stars like the Sun in order to detect their planets.
 
  Both stars have a velocity curve with a periods of 2 years, but the maximum size (peak-to-peak amplitude) of the velocity curve of star A is 100 km/s, and for star B it is 200 km/s. What causes this difference? Assume the planets are named after their stars.
  A) Planet A is farther from Star A than Planet B is from Star B.
  B) Planet A is closer to Star A than Planet B is to Star B.
  C) Planet A is more massive than Planet B.
  D) Planet A is less massive than Planet B.
  E) Not possible to say, since you're measuring the velocity curve of the stars, not the planets.

Question 2

Why do quasars die out over time?
 
  What will be an ideal response?

[karmakat49]

Answer to Question 1

D

Answer to Question 2

The black hole at their center consumes the fuel supply close to it. As less material falls into the central engine, less radiation is given off.

[serike]

Thanks

[karmakat49]

Welcome