Which of the following has the greatest mass?

Which of the following is true about low-mass stars compared to high-mass stars?

• Low-mass stars have the same temperature and luminosity as high-mass stars. Low-mass stars are cooler but more luminous than high-mass stars. Low-mass stars are hotter but less luminous than high-mass stars. Low-mass stars are cooler and less luminous than high-mass stars. Low-mass stars are hotter and more luminous than high-mass stars.

• Answer:

  Low-mass stars are cooler and less luminous than high-mass stars. High mass stars burn hotter because they have stronger gravity, and burn (actually called nuclear fusion) through their hydrogen fuel faster. This also makes high mass stars die younger than low mass stars, because they burn through their fuel quicker.