astrophysics

How much time does it take to go into a black hole?

• 1 second

• infinite time

• 20 years

• 2 picoseconds

What is the fourth layer of the atmosphere

• Troposphere

• Thermosphere

• Exosphere

• Vesosphere

Which of the following is the largest?

• Parsec

• Lightyear

• Astronomical Unit

• 1 billion Kilometers

In this theory, astronomers think that once a limit is reached, the universe will collapse upon itself and shrink back down to pure energy.

• Milky Way

• Big Crunch

• Big Dipper

• Nothing

______________________has helped scientists move one step closer to PROVING that the Big Bang actually happened.

Examples of nuclear fuels are...

• Uranium

• Neptunium

• Plutonium

• Mercury

Experiment 16.1 shows us that the universe is expanding

• From the center out

• From the center to the right

• Away with no specific geometry

• in a spiral pattern

Critical mass is

• The amount of isotope needed to stop a chain reaction

• The amount of isotope needed to start a chain reaction

• The amount of radioactive material needed to start chain reaction.

• The amount of isotope necessary to sustain a chain reaction.

An H-R diagram is : (choose all that are true)

• Hertzsprung-Russell Diagram

• a diagram that compares the relationship between a star's temperature and it's magnitude.

• plots spectral letters and absolute magnitude on a graph

• Hertzmann-Ross Diagram

A star’s brightness depends on its _________.

Its color depends on its ___________________.

Its life cycle depends on its __________.

• size, mass, color

• size, temperature, mass

• temperature, mass, size