Term
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Compared to the Milky Way Galaxy, how much energy does a quasar emit?
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Definition
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Term
What determines whether the Universe will continue to expand forever?
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Definition
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Term
What is the diameter of the Milky Way Galaxy in light years?
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Definition
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Term
What kind of telescope was used to discover the first quasar?
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Definition
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Term
Which of these objects is the farthest from the Earth?
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Definition
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Term
What sets a size limit on the diameter of a quasar?
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Definition
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Term
What is a possible source of power for a quasar?
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Definition
| Matter falling into a black hole |
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Term
What formula can be used to find the mass of a galaxy?
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Definition
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Term
How long does it take for the Sun to orbit the Milky Way galaxy?
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Definition
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Term
What is the critical density needed to cause the Universe to eventually collapse in grams per cubic centimeter?
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Definition
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Term
Jack and Joe drive toward each other at 30 ad 60 mph. After 10 minutes they pass. How far apart were they when they started?
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Definition
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Term
Two galaxies are separated by one million light years and are moving away from each other at 20 kilometers/second. How much time has elapsed in years since they were together?
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Definition
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Term
What is the evidence that the universe may be accelerating?
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Definition
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Term
How bright is a supernova compared to the galaxy?
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Definition
| About the same brightness |
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Term
How are galaxies distributed in the universe?
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Definition
On spherical shells surrounding voids
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Term
What is the evidence for “dark matter” in the Milky Way galaxy?
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Definition
| Galaxy rotates too quickly |
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Term
What did Edwin Hubble discover that distances of galaxies were related to?
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Definition
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Term
Would observers on other galaxies see the same expansion of the Universe that we see? Would Hubble’s Law still work?
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Definition
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Term
If you found a star that seemed to match the position of strong radio sources, what would you measure to tell if it’s a quasar?
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Definition
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Term
How are distances to quasars determined?
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Definition
| Red shifts and Hubble's law |
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Term
How much time has elapsed since the creation of the Universe, according to the Big Bang Theory?
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Definition
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Term
What do gravitational lenses do?
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Definition
Make multiple images of a Galaxy
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Term
How can clouds of cold mono-atomic hydrogen be observed?
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Definition
| 21 cm spin-flip radio waves |
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Term
How does the Tully-fisher relation work?
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Definition
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Term
Can most of the mass of the Milky Way galaxy be accounted for by shining stars and clouds of dust and gas?
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Definition
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Term
What techniques might be used to find dark matter, if it’s made of brown dwarfs?
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Definition
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Term
How do you find Cepheid variable star luminosity?
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Definition
| Period of luminosity range |
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Term
What is spectroscopic parallax?
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Definition
Finds distance to star clusters by plotting HR diagrams
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Term
What causes Cepheid variable stars to change in brightness?
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Definition
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Term
How can the line of sight speed of a galaxy be measured?
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Definition
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