Physics and Technology for Future Presidents: Chapter 13
Who is famous for his estimate of extraterrestrial intelligence
Drake
For the earth to become a black hole, it would have to be reduced to the size of
a coin
A light-year is
a distance
If the sun were made into a black hole, its radius would be approx
a few kilometers
A galaxy is
a large collection of stars
What is Nemesis
a theoretical star that orbits the sun, making comets and asteroids veer toward the sun
When you look at a galaxy 5 billion light-years away, you
see this galaxy as it was 5 billion years ago
Light from the Andromeda Galaxy reaches us in
several millions of years
Dark energy makes the universe
speed up
Choose the following that are NOT part of our solar system
the Andromede Galaxy
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
Dark matter is made of
we don't know
Oxygen and nitrogen were created
within a star
The age of the universe is closest to
10 billion years
If we turn the sun into a black hole, the the force of the earth will
be unchanged
The expansion of the Universe is accelerating. Physicists attribute this to
dark energy
Most of mass in the unverse is made of
dark matter
Most of the mass of the universe is
dark matter
To become a black hole, an object must
have enough mass that the escape velocity exceeds c
To make a black hole, we need
high mass in a small radius
What was made in the first 4 minutes after the Big Bang
hydrogen, helium
Doppler shift for galaxies
is usually toward red
