Astronomy H/I

The Sun is

• one star among billions in the Milky Way
• located at the center of the galaxy
• the biggest and most powerful star in the galaxy
• powered by an oxygen-burning process

Galaxies are huge collections of

• stars, dust, and gas
• planets and dust
• planets and gas
• stars with no dust or gas

We cannot see the Milky Way galaxy from outside of it because

• the solar system is embedded within the galaxy
• it is the entire universe
• its gravity is too strong
• light cannot escape from the galaxy

Scientists believe the universe began in an event called

• the Big Bang
• the Big Crunch
• the Supernova
• the Cosmic Microwave Background

The largest structures in the universe are called

• sheets and filaments
• superclusters
• galaxies
• stars

The diameter of the Milky Way is about

• 100,000 light years
• 10 light years
• 100,000 kilometers
• 1 light year

Where is our Sun located in the Milky Way?

• about two thirds from the center to edge
• in the center
• near the edge
• astronomers don't know yet

When seen edge on, the Milky Way

• is flat with a buldge in the middle
• looks like a football
• looks like a volley ball
• is flat in the middle with a buldge at each edge

Andromeda is

• a galaxy similar to Milky Way
• possible origin of the universe
• our nearest neighboring galaxy
• what may be left after a supernova explosion

Neutron stars are

• what may be left after a supernova explosion
• a galaxy similar to Milky Way
• possible origin of the universe
• our nearest neighboring galaxy