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17 Cards in this Set
- Front
- Back
What is the minimum temperature required for fusion to occur?
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10 million K
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A star is discovered that has exactly the same surface temperature as our Sun, but is considerably larger in size. Where would it appear on a typical HR diagram, compared to where the Sun is?
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Directly above the Sun
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What is the correct order for the spectral classes?
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OBAFGKM
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A 4 MSun stellar remnant would form a...
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Black Hole
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When it is done, our Sun will leave behind a..
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White Dwarf
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The diameter of a typical, middle-sized star is roughly how many times bigger than Earth's?
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100 times
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What is a planetary nebula?
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The outer layers of a low mass star drifting off into space.
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What is the highest possible mass for a pulsar?
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3 MSun
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What is the last element to build up in teh core of an M star (that is, the star of spectral class M)?
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Carbon
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The most massive black holes in the Universe are believed to exist in..
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Quasars
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According to Hubble's law, on large scales the ________ of a galaxy is proportional to its __________.
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redshift; distance
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What are the contents of the Universe during the particle era?
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Electrons, quarks, antiparticles
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During which era of the early Universe were hydrogen nuclei fusing into helium?
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Nucleosynthesis Era
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Which places in our solar system (other than Earth) are the most likely to have had life at some point?
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Mars and Europa
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True or False: When a star leaves the main sequence, its mass dramatically increases.
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False. Mass never increases, but rather is constantly decreasing.
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True or False: All main sequence stars have roughly the same mass.
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False.
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True or False: The Drake Equation gives an estimate of the number of life forms in the Universe.
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False. The Drake Equation gives us the number of technologically advances civilizations in our galaxy.
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