Deep Sky Objects

______ is a force that causes dust particles to stick together in a nebula.

• nuclear fusion
• gravity
• hydrogen
• iron

All stars begin as a __________?

• giant
• black hole
• white dwarf
• nebula

Nebula's are mixtures of gases and what?

• clouds
• stars
• tiny particles
• dust

About 4.6 billion years ago, a cloud of stellar dust or nebula exists within the Milky Way. What happened next?

• Shock waves hit the nebula causing it to collapse.

• The energy enriched nebula begins to contract further due to gravity.

• Supernova of a nearby star occurs.

The nebula begins to spin and flatten. Then what?

• The center of the nebula begins to get hot and dense.

• Gravity causes light gases to move to the center while heavier materials and ice stay in outer areas.

• A protostar forms in the center of the nebula.

This is a young star that glows as gravity brings it together

• Nebula
• Protostar
• Main-sequence star
• Red giant

Most stars are made of which elements?

• Hydrogen only
• Hydrogen and Lithium
• Hydrogen and Sodium
• Hydrogen and Helium

The Orion Nebula is a nearby star-forming region in which galaxy?

• Pegasus

• Andromeda

• IC 1101: a supergiant elliptical galaxy at the center of the Abell 2029 galaxy cluster

• The Milky Way

When visible light hits interstellar dust, what happens to blue and red light?

• blue light is scattered, red light is transmitted

• blue light is absorbed, red light is transmitted

• blue light is transmitted, red light is scattered

• blue light is scattered, red light is absorbed

What kind of galaxy is this?

• Ring
• Irregular
• Spiral
• Elliptical