Stars and galaxies

Front

What determines the color of a star?

Back

The temperature of the star determines its color.

Front

How are stars with the same temperature arranged on an HR diagram?

Back

Stars at the same temperature are aligned vertically (one above the other) on the HR diagram.

Front

What color of star is the hottest?

Back

Blue stars are the hottest.

Front

What type of galaxy has a spiral shape?

Back

A spiral galaxy.

Front

What happens to luminosity as you move from the bottom to the top of the HR diagram?

Back

Luminosity/brightness increases.

Front

What is the main sequence in an HR diagram?

Back

The main sequence is a diagonal band where most stars lie, showing a relationship between temperature and luminosity.

Front

What is a galaxy?

Back

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

Front

What are the three main types of galaxies?

Back

The three main types of galaxies are spiral, elliptical, and irregular.

Front

What is the significance of a star's magnitude?

Back

Magnitude measures the brightness of a star as seen from Earth.

Front

What is a quasar?

Back

A quasar is a highly luminous object powered by a supermassive black hole at the center of a distant galaxy.