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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.
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