Universe Review

Front

What is a nebula?

Back

A nebula is a giant cloud of dust and gas in space, where star formation begins.

Front

What does a Hertzsprung-Russell (H-R) diagram represent?

Back

An H-R diagram 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 white dwarf?

Back

A white dwarf is a small, dense star that is typically the final stage in the life cycle of a medium-sized star, like our sun.

Front

List the colors of stars from lowest temperature to highest temperature.

Back

Red, orange, yellow, white, blue.

Front

Why does the sun appear brighter than other stars?

Back

The sun is much closer to Earth than other stars, making it appear brighter.

Front

What is a main-sequence star?

Back

A main-sequence star is a star that is in the stable phase of its life cycle, where it fuses hydrogen into helium in its core.

Front

What happens to a star when it exhausts its nuclear fuel?

Back

When a star exhausts its nuclear fuel, it undergoes changes that can lead to it becoming a red giant, supernova, neutron star, or black hole, depending on its mass.

Front

What is a supergiant star?

Back

A supergiant star is a very large star that is much brighter than a main-sequence star of the same temperature.

Front

What is the life cycle of a star?

Back

The life cycle of a star includes stages such as nebula, main-sequence star, red giant or supernova, and finally, white dwarf, neutron star, or black hole.

Front

What is the significance of a star's temperature?

Back

A star's temperature determines its color, luminosity, and stage in the stellar life cycle.