chapter 13: cosmology Flashcards
Most of the mass of the universe is
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 of the universe
What was made in the first 4 minutes after the Big Bang
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 energy
To make a black hole, we need
high mass in a small radius
Most of mass in the unverse is made of
dark matter
Oxygen and nitrogen were created
within a star
What is Nemesis
a theoretical star that orbits the sun, making comets and asteroids veer toward the sun
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, its radius would be approx
a few kilometers
If we turn the sun into a black hole, the the force of the earth will
be unchanged
Choose the following that are NOT part of our solar system
the Andromede Galaxy
a galaxy is
a large collection of stars
a light-year is
a distance
