Match the term to its description.

Apparent magnitude A) Russel diagram

Hertzsprung B) An interstellar cloud of dust and gases

Absolute brightness C) The brightness of a celestial object as it is measured from Earth

Nebula D) The total amount of energy emitted from a celestial object

Apparent magnitude: The brightness of a celestial object as it is measured from Earth

Hertzsprung: Russel diagram

Absolute brightness: The total amount of energy emitted from a celestial object

Nebula: An interstellar cloud of dust and gases

Explanation:

Astronomists define the brightness of stars from the earth as apparent magnitude. They measure how much celestial objects bright from the earth.

Ejnar Hertzsprung was a chemist and astronomer. He developed the Hertzsprung-Russell diagram that describes the luminosity of a set of stars as a function of temperature.

Absolute brightness is a measurement of total heat emitted from stars or celestial objects on a common scale. Apparent brightness can be changed when taken from another place

In astronomy, a nebula is a giant cloud of dust and gas in space.