Universe Test Review

Front

What is the life cycle of a star?

Back

The life cycle of a star includes stages such as protostar, main sequence, red giant or supergiant, and ends with a supernova or planetary nebula, leading to a white dwarf or neutron star.

Front

What is a protostar?

Back

A protostar is an early stage in the formation of a star, where gas and dust collapse under gravity, leading to the formation of a dense core.

Front

What happens to a small or medium-sized star after it exhausts its fuel?

Back

It becomes a planetary nebula and eventually forms a white dwarf.

Front

What is a white dwarf?

Back

A white dwarf is the remnant of a small to medium-sized star that has exhausted its nuclear fuel and shed its outer layers.

Front

What is a planetary nebula?

Back

A planetary nebula is a shell of gas ejected from a star during the late stages of its life cycle, often surrounding a white dwarf.

Front

How does the mass of a star affect its life cycle?

Back

More massive stars have shorter life cycles because they burn their fuel more quickly than less massive stars.

Front

What is a red supergiant?

Back

A red supergiant is a late stage in the life cycle of a massive star, characterized by its large size and red color.

Front

What is a supernova?

Back

A supernova is a powerful explosion that occurs at the end of a massive star's life cycle, resulting in the star's destruction.

Front

What are galaxies classified by?

Back

Galaxies are classified by their shape (spiral, elliptical, irregular) and not solely by the number of stars they contain.

Front

What is the main sequence stage of a star?

Back

The main sequence is the longest stage in a star's life cycle, where it fuses hydrogen into helium in its core.