Chapter 26 Section 2 Quiz

What is a star?

A large, glowing ball of gas in space, which generates energy through nuclear fusion in its core.

A graph of the surface temperature, or color, and absolute brightness of a sample of stars.

What is a light year?

The distance that light travels in a vacuum in a year, which is about 9.5 trillion kilometers.

The apparent change in position of an object with respect to a distant background

What is a parallax?

The apparent change in position of an object with respect to a distant background

The brightness of a star as it appears from Earth

What is the apparent brightness?

The brightness of a star as it appears from Earth

How bright a star really is; a characteristic of the star and does not depend on how far it is from Earth.

What is the absolute brightness?

The very bright stars at the upper right of the H-R diagram; much brighter than main-sequence stars of the same temperature.

How bright a star really is; a characteristic of the star and does not depend on how far it is from Earth.

What is an H-R diagram?

A graph of the surface temperature, or color, and absolute brightness of a sample of stars.

The small, dense remains of a low or medium-mass star.

What is the main sequence?

The diagonal band on the H-R diagram

The very bright stars at the upper right of the H-R diagram; much brighter than main-sequence stars of the same temperature.

What are super giants?

The small, dense remains of a low or medium-mass star.

The very bright stars at the upper right of the H-R diagram; much brighter than main-sequence stars of the same temperature.

What is a white dwarf?

The small, dense remains of a low or medium-mass star.

The diagonal band on the H-R diagram

What are absorption lines?

Show where light has been absorbed; can be used to identify different elements in the star; Absorption lines of most elements have been identified in the spectra of stars.

The very bright stars at the upper right of the H-R diagram; much brighter than main-sequence stars of the same temperature.

Chapter 26 Section 2 Quiz

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