characteristics of the universe

Front

What is an elliptical galaxy?

Back

A type of galaxy characterized by an elongated shape and smooth, featureless light profile, often containing older stars and little gas and dust.

Front

What are the two main characteristics used in the H-R diagram to classify stars?

Back

Temperature and brightness.

Front

What is the universe?

Back

The vast, all-encompassing space that contains all matter, energy, galaxies, stars, and planets.

Front

What is a spiral galaxy?

Back

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

Front

What is luminosity in the context of stars?

Back

The total amount of energy emitted by a star per unit of time, often measured in watts.

Front

What is a star's temperature?

Back

The measure of how hot a star is, which affects its color and stage in the stellar lifecycle.

Front

What is an irregular galaxy?

Back

A type of galaxy that does not have a distinct regular shape, often containing young stars and high amounts of gas and dust.

Front

What is the difference between a galaxy and a solar system?

Back

A galaxy is a massive system of stars, star clusters, and interstellar matter, while a solar system consists of a star and the celestial bodies that orbit it.

Front

What is the significance of the H-R diagram in astronomy?

Back

It is a scatter plot of stars showing the relationship between their absolute magnitudes or luminosities versus their stellar classifications or effective temperatures.

Front

What is a nebula?

Back

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