Physical Science Unit 3 Review

Front

The Milky Way is about ____________ light years in diameter.

Back

100,000

Front

______________ are concentrations of cool, dense clouds of gases and dust.

Back

Nebulae

Front

What are the two types of supernova?

Back

Type I and Type II

Front

What is fusion nuclear energy?

Back

A process where two light atomic nuclei combine to form a heavier nucleus.

Front

What is fission nuclear energy?

Back

A process where a large nucleus splits into two smaller nuclei.

Front

What is a nebula?

Back

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

Front

What is the difference between fusion and fission?

Back

Fusion combines light nuclei to form a heavier nucleus, while fission splits a heavy nucleus into lighter nuclei.

Front

What is a supernova?

Back

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

Front

What role do nebulae play in star formation?

Back

Nebulae provide the material (gas and dust) necessary for the formation of new stars.

Front

What is the significance of the Milky Way's diameter?

Back

The diameter of the Milky Way helps astronomers understand the size and structure of our galaxy.