Question:

The solar system is believed to have formed 

Ans:

4.5 billion years ago 

Question:

The Sun is made up of extremely hot gases 

Ans:

Hydrogen and Helium 

Question:

Sound travels at a speed of 

Ans:

330 m per second

Question:

The study of the Universe is 

Ans:

Cosmology

Question:

_____________is the unit used to measure the distance between the celestial bodies. 

Ans:

Light Year

Question:

The surface temperature of the Sun is about 

Ans:

6,000° C