Solar System

Match it! Select the correct answer from the pull down...Good luck!

Areas of the Sun that appear cooler than surrounding areas.

What are the percentages of hydrogen and helium in the Sun?

What is the process in which two hydrogen atoms become one helium atom?

Pluto is now considered to be a _____________ planet.

How many miles in a light year?

Which other planet is most similar to Earth in mass and volume?

What is the process in which two hydrogen atoms become one helium atom?

Where does nuclear fusion occur?