8.8A Components of the Universe

Front

What are the four main shapes of galaxies?

Back

Lenticular, irregular, elliptical, and spiral.

Front

What is the Hertzsprung-Russell diagram used for?

Back

It classifies stars based on their brightness, temperature, and color.

Front

What is a galaxy?

Back

A system of stars, gases, and dust held together by gravity.

Front

Name the types of galaxies classified by their shapes.

Back

Spiral Galaxy, Irregular Galaxy, Elliptical Galaxy.

Front

Which type of galaxy is NOT recognized?

Back

Oblong Galaxy.

Front

What force holds the stars and matter in a galaxy together?

Back

Gravity.

Front

What is a nebula?

Back

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

Front

What is the difference between a star and a planet?

Back

A star generates its own light through nuclear fusion, while a planet does not.

Front

What is dark matter?

Back

A form of matter that does not emit light or energy, making it invisible, but it exerts gravitational effects.

Front

What is the main component of the universe?

Back

Galaxies, which contain stars, planets, and other celestial bodies.