The Universe: Galaxies & Stars

Front

What are galaxies composed of?

Back

Galaxies are composed of stars, dust, and gas held together by gravity.

Front

What type of galaxy is characterized by a lack of a defined shape?

Back

Irregular galaxy.

Front

Which type of star is the coldest?

Back

Red Star.

Front

What determines the color of a star?

Back

The temperature of the star.

Front

What are the two axes of the Hertzsprung Russell Diagram?

Back

Luminosity and Temperature.

Front

What is a spiral galaxy?

Back

A galaxy with a flat, rotating disk containing stars, gas, and dust, and often a central concentration of stars known as the bulge.

Front

What is an elliptical galaxy?

Back

A galaxy shaped like an ellipse, with no distinct structure, containing older stars and little gas.

Front

What is a nebula?

Back

A giant cloud of dust and gas in space, often the birthplace of stars.

Front

What is a supernova?

Back

A powerful and luminous explosion of a star, marking the end of its life cycle.

Front

What is a black hole?

Back

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