Download Name Date ______ Period _____ Earth Science Chapter 25 Study

Name _______________________________________ Date ___________ Period _____
Earth Science
Chapter 25 Study Guide
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Patterns of stars called ____________________ were originally named in honor
of mythological characters or great heroes.
The most basic way to measure the distance to a star is ____________________.
A light-year is the distance ____________________ travels in a year.
Apparent magnitude refers to a star’s ___________________ as it appears from
____________________.
Some stars, called ____________________, get brighter and fainter in a regular
pattern.
A(n) ____________________ is a developing star not yet hot enough to engage in
nuclear fusion.
Stars that radiate short pulses of radio energy are called ____________________.
The most dense stars known to exist are called ___________.
The average star spends ____________________ percent of its life as a
hydrogen-burning, main-sequence star.
The sun is positioned about ____________________ of the way from the center
of the galaxy.
The Milky Way is classified as a(n) ____________________ galaxy.
In addition to size and shape, one of the major differences among galaxies is the
____________________ of their stars.
A(n) ____________________ galaxy is a type of galaxy that lacks symmetry.
The apparent change in wavelength of radiation caused by the relative motions of
the source and the observer is called the ____________________.
The ____________________, which occurred in an instant, marks the beginning
of the universe.
Earth Science
Chapter 25 study guide
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According to Figure 25-1, which main-sequence stars are brightest? ___________
According to Figure 25-1, the sun has an absolute magnitude of
___________________.
Stars of which color have the highest surface temperature?
__________________________________________________________________
A star with a surface temperature between 5000 K and 6000 K appears
____________________.
How was the mass of stars determined?
__________________________________________________________________
Stars of which color have the coolest surface temperature?
__________________________________________________________________
How big is a light-year and what does it measure?
__________________________________________________________________
Stellar distances are usually expressed in what units?
__________________________________________________________________
What is parallax and how is it used in astronomy?
__________________________________________________________________
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What affects the apparent brightness of a star?
__________________________________________________________________
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Earth Science
Chapter 25 study guide
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What is the measure of the brightness of a star?
_________________________________________________________________
If star A is farther from Earth than star B, but both stars have the same absolute
magnitude, what is true about their apparent magnitude?
_________________________________________________________________
What is the relationship between a magnitude number and the brightness of a
star?
__________________________________________________________________
__________________________________________________________________
The difference in the brightness of two stars with the same surface temperature is
attributable to what?
__________________________________________________________________
__________________________________________________________________
What types of nebula are there?
__________________________________________________________________
__________________________________________________________________
A Hertzsprung-Russell (H-R) diagram shows what relationship?
__________________________________________________________________
__________________________________________________________________
What type of stars are 90% of the stars on the H-R diagram?
__________________________________________________________________
Which main-sequence stars are the most massive?
__________________________________________________________________
Which main-sequence stars are the least massive?
__________________________________________________________________
What is the name for the interstellar matter that will eventually form a star?
__________________________________________________________________
When is a star said to be born?
__________________________________________________________________
What forces are most responsible for the formation of a star?
__________________________________________________________________
In the Milky Way, what is the most abundant gas in emission nebulae?
__________________________________________________________________
What is it called when a massive star explodes?
__________________________________________________________________
Which stars are composed of matter in which electrons have combined with
protons?
__________________________________________________________________
What happens to all stars regardless of size at the end of their life?
__________________________________________________________________
__________________________________________________________________
Before being engulfed, matter that is pulled into a black hole should become very
hot and emit what? _________________________________________________
What does a main-sequence star that has exhausted the fuel in its core become?
__________________________________________________________________
Earth Science
Chapter 25 study guide
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What type of star is our sun?
__________________________________________________________________
What is the next stage in the sun’s life cycle?
__________________________________________________________________
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Light cannot escape the intense gravitational pull of a
______________________.
What is our galaxy called?
__________________________________________________________________
How big is the Milky Way Galaxy at its nucleus?
__________________________________________________________________
__________________________________________________________________
What are 60% of all know galaxies classified as?
__________________________________________________________________
What types of galaxies are there?
__________________________________________________________________
__________________________________________________________________
According to Hubble’s law, galaxies are retreating at a speed that is proportional
to what? __________________________________________________________
What indicators are there that the universe is expanding?
__________________________________________________________________
__________________________________________________________________
What do greater red shifts in the spectra of galaxies indicate?
__________________________________________________________________
__________________________________________________________________
According to the big bang theory, when did the universe begin?
__________________________________________________________________
What supports the big bang theory?
__________________________________________________________________
__________________________________________________________________
__________________________________________________________________
additional notes:
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Earth Science
Chapter 25 study guide
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