Physics and Technology for Future Presidents: Chapter 13

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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


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