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Physics ch. 13
Question | Answer |
---|---|
Most of the Mass of the Universe is (be careful) | dark matter |
Dark matter is made of | we don't know |
Doppler shift for galaxies | is usually toward red |
The discovery of dark energy means that | the expansion of the universe is accelerating |
In the Big Bang Theory | there is no center to the universe |
What was made in the first 4 minutes after the Big Bang (all that apply) | hydrogen, helium |
To become a black hole, an object must | have enough mass that the escape velocity exceeds c |
Dark energy makes the Universe | speed up |
When you look at a galaxy 5 billion light years away, you | see this galaxy as it was 5 billion years ago |
Who is famous for his estimate of extraterrestrial intelligence? | Drake |
The expansion of the Universe is accelerating. Physicists attribute this to | dark matter |
To make a black hole, we need | high mass in a small radius |
Most of the mass in the universe is made of | planets |
Oxygen and nitrogen were created | within a star |
What is Nemesis | a theoretical star that orbits the Sun, making comets and asteroids veer toward Earth |
light from the Andromeda Galaxy reaches us in | several millions of years |
The Age of the universe is closest to | 10 billion years |
For the Earth to become a black hole, it would have to be reduced to the size of | a coin |
If the sun were made into a black hole, it's radius would be approximately | a few kilometers |
If we turn the Sun into a black hole, then the force on the Earth will | be unchanged |
Choose all of the following that are NOT part of our solar system | the Andromeda Galaxy |
A galaxy is | a large collection of stars |
A light year is | a distance |