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In the Martian video: What is Mark’s specialty in science?

You observed three different star clusters and found that the main-sequence turnoff stars in cluster 1 had spectral type A, the main-sequence turnoff stars in cluster 2 had spectral type B, and the main-sequence turnoff stars in cluster 3 had spectral type G. Which star cluster is the oldest?

Helium burns in the core of a horizontal branch star via ________ and produces ________. 

A Cepheid star varies in luminosity because the:

The slower-moving star in a binary is:

Essentially all the elements heavier than iron in our galaxy were formed:

The correct order of evolutionary stages for a solar mass star is:

What are the latitudes of the tropics of Cancer and Capricorn?

The force of gravity that an object has is directly related to its

Which of Newton’s laws states that if an unbalance force acts on an object, then the object’s motion changes?