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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?

A Type Ia supernova occurs when a white dwarf exceeds a mass of:

A nova is the result of which explosive situation?

When the core of a massive star collapses, a neutron star forms because:

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: