Exam 24: Beyond Our Solar System

Stars that are composed of matter in which electrons have combined with protons are called ________ stars.

The measure of a star's brightness is called its ________.

The discovery that the universe appears to be expanding led to a widely accepted theory called ________.

Which main-sequence stars are the least massive?

Stars spend most of their life span as main-sequence stars.

Hubble's law states that galaxies are receding from us at a speed that is proportional to their ________.

Most stars are in this stage of evolution.

The most dense objects are known are black holes.

A star in which light cannot escape because of the immense gravitational pull is called a(n) ________.

The point in stellar evolution when a star has used up all its fuel and is radiating away its remaining thermal energy as light is the ________ stage.

The Milky Way is classified as a spiral galaxy.

Hubble's law states that galaxies are receding from us at a speed that is proportional to their ________.

Cool stars evolve much more quickly than do hot stars.

Possibly the most cataclysmic event associated with the death of a star is the ________.

Based on the observed red shifts in the spectral lines of distant galaxies, astronomers conclude that ________.

The final stage in the evolution of the most massive stars is a ________.

The measure of a star's brightness is called its magnitude.

The measurement of the slight back-and-forth shifting in a nearby star's position due to the orbital motion of Earth is called ________.

The most dense stars known to exist are ________.

Which main-sequence stars are the most massive?