Chapter 21 Test: Stars, Galaxies, and the Universe

Most galaxies are moving away from each other which means the universe is contracting.

• True

• False

Astronomers measure the distance of a star in units called kilometers.

• True

• False

The brightness of a star as seen from Earth is called its apparent magnitude.

• True

• False

A star that has no fuel but glows faintly is a black dwarf.

• True

• False

Stars with less mass will last longer than stars with more mass.

• True

• False

The hottest stars are blue-white in color.

• True

• False

The type of light that humans can see is _______________ light.

• visible

• ultraviolet

• infrared

• microwave

Astronomers use _______________ magnitude to compare the brightness of stars.

• absolute

• apparent

• intrinsic

• visual

The length of a star’s life is determined by its _______________.

• mass

• luminosity

• radius

• temperature

A dying giant star can suddenly explode, becoming a(n) _______________.

• supernova

• white dwarf

• red giant

• neutron star