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39 Cards in this Set
- Front
- Back
What do the remains of a supernova become?
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a neutron star
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How can you tell a star's temperature?
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by its color
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What is all of space and everything in it called?
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universe
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What can giants and super giants blow up into?
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supernovas
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What happens to the largest supernovas when they collapse?
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they become black holes
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What is a light year?
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the distance that light travels in one year
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Is a light year a unit of distance or time?
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a unit of distance
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What do astronomers use to measure distances to nearby stars?
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parallax
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What is parallax?
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The apparent change in position of an object when you look at it from different places.
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What are the main characteristics used to classify stars?
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size, temperature, and brightness
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What are very large stars called?
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giant stars or supergiant stars
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What are two important characteristics of stars?
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temperature and absolute magnitude
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What is the diagonal line formed by most of the stars in the H-R diagram called?
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the main sequence
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In the main sequence, does surface temperature increase or decrease as brightness increases?
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surface temperature increases as brightness increases
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What is nuclear fusion?
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The process in which hydrogen atoms in the stars combine to for helium and release energy.
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In nuclear fsion hydrogen atoms combine with what to release energy?
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helium
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What is the nebula?
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a swirling cloud of dust and gas
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As stars run out of fuel they expand to form what?
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red giants and supergiants
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The remains of the largest supernovas collapse and become what?
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black holes
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What is formed when gravity forces the dust and gases of a nebula together?
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a protostar
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What is so strong in a black hole that even light cannot escape?
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gravity
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True or false? Small and medium stars will become supernovas?
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false
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What gas is fuel for stars?
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helium
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A star's brightness as if it were a standard distance is called its what?
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absolute magnitude
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A huge group of stars, such as the Milky Way, is called what?
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a galaxy
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The unit used to measure distances between stars is a what?
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a light year
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The region of the Hertzsprung-Russell diagram with the most stars is called the what?
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main sequence
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A graph of stars showing temperature on the X-axis and brightness on the Y-axis is called a what?
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Hertzsprung-Russell (H-R) diagram
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What is used to determine the distance to nearby stars?
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parallax
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The brightness of a star as seen from Earth is called its what?
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apparent magnitude
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Because of its large size, the star Aldebaran is often called a what?
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giant star
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How do all stars begin?
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as part of a nebula
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What is a nebula?
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a large cloud of dust and gas swirling in space
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What forces dust and gases together to form a protostar?
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gravity
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What does the length of a star's life depend upon?
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its mass
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Do stars with less mass live longer? Why?
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Yes because they use their fuel more slowly
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What happens when stars rn out of fuel? What is formed?
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The center shrinks but the outer part expands forming red giants or supergiants
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What do small and medium stars (white dwarfs) become when they stop glowing?
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black dwarfs
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White-dwarfs will become black dwars when they stop doing what?
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glowing
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