What is a large celestial body that is composed of gas and that emits light?

• Nebula
• Star
• Galaxy
• Planet

A collection of stars, dust, and gas bound together by gravity is...

• Universe
• Solar System
• Planet
• Galaxy

The distance that light travels in one year...

• Light year
• Quantumyear
• Stellar-year
• 1 million kilometers

What is a large spherical body that orbits a star?

• Meteorite
• Black hole
• Planet
• Nebula

The sun and all of the planets and other bodies that travel around it make up our...

• Galaxy
• Solar System
• Cluster
• Constellation

A large cloud of gas and dust in interstellar space; the predecessor to stars...

• Constellation
• Black hole
• Nebula
• Galaxy

What is the graph that shows the relations between a star's surface temperature and absolute magnitude?

• H-R Diagram
• Star Cluster Map
• Einstein's Diagram
• Newton's Chart of Stars

Space and all the matter and energy in it is...

• Universe
• Galaxy
• Solar System
• Ecosystem

Lightyear is used by scientist to measure what?

• Distance
• Time
• Energy

Nebulae are considered "Stellar Nurseries" because...

• Planets are created from the gases
• Stars form from them
• Asteroids are formed from them