HR diagram and Cosmos

Front

What determines a star's color?

Back

A star's temperature determines its color.

Front

What is the Universe?

Back

Everything that exists, including all matter and energy, mostly consists of empty space.

Front

What does the Hertzsprung-Russell diagram graph?

Back

The Hertzsprung-Russell diagram graphs stars' luminosity and temperature.

Front

What is a comet?

Back

An object orbiting the Sun, made of ice and rock, that has a tail pointing away from the Sun.

Front

What type of star is Aldebaran?

Back

Aldebaran is a red giant.

Front

What is luminosity in relation to stars?

Back

Luminosity is the total amount of energy emitted by a star per unit time.

Front

What is a main sequence star?

Back

A main sequence star is a star that is in the stable phase of hydrogen burning in its core.

Front

What is a red giant?

Back

A red giant is a late stage in a star's life cycle when it has expanded and cooled.

Front

What is a black hole?

Back

A black hole is a region of space where the gravitational pull is so strong that nothing, not even light, can escape from it.

Front

What is a galaxy?

Back

A galaxy is a massive system of stars, stellar remnants, interstellar gas, dust, and dark matter.