Stars differ in all of the following ways except…

• size
• temperature
• color
• composition

Of the choices given, the coolest stars are __________; the hottest stars are __________.

• yellow; orange
• blue; orange
• yellow; yellow
• red; blue

Our star, the Sun, will likely end its life as a

• red giant
• black hole
• white dwarf
• supernova

Scientists collide particles in particle accelerators to

• simulate the conditions of the birth of the universe.
• simulate nuclear fusion in a star's core.
• fuse subatomic particles.
• all of these

Stars form 

• from a nebula; gravity causes material to collapse until fusion begins.
• particles of rock and metal that smash together to form a body that begins nuclear fusion
• a supernova explosion that releases material into space.
• none of these

The H-R Diagram is a    that shows the relationship between      and   .

• Scatter plot; brightness & temperature
• Line graph; brightness & star size
• Scatter plot; star size & temperature
• none of these

Galaxies are

• elliptical, spiral or irregular
• stationary
• made of millions, billions, trillions of stars
• none of these

What can't escape a black hole?

• mass
• matter
• light
• all of these

The farther away a galaxy, the faster it is moving away from us is called…

• Hubble's Law
• Big Bang Theory
• the Doppler Effect
• the law of reverse gravitation

By analyzing the spectrum of light from distant galaxies, astronomers learned that they are

• made of different materials
• moving away from us
• hotter the farther out there are
• none of th