Universe Practice E

Front

Order these objects from smallest to largest: planets, solar system, galaxy, universe.

Back

Planets, solar system, galaxy, universe.

Front

What is the coolest star color?

Back

Red.

Front

What is an object that revolves around a star?

Back

Planet.

Front

Which star is classified as a main sequence star?

Back

A.

Front

What happens as you move from the bottom to the top of the H-R diagram?

Back

Stars get brighter.

Front

Define a galaxy.

Back

A galaxy is a massive system of stars, stellar remnants, interstellar gas, dust, and dark matter, bound together by gravity.

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 a star and a planet?

Back

A star is a luminous celestial body made of plasma that generates energy through nuclear fusion, while a planet is a celestial body that orbits a star and does not produce its own light.

Front

What is the main sequence in the H-R diagram?

Back

The main sequence is a continuous and distinctive band of stars that appears on plots of stellar color versus brightness.

Front

What is the largest known structure in the universe?

Back

The observable universe.