What is the distance between the Earth and the Moon?

What is the distance between the Earth and the Sun?

What is the circumference around the Earth?

How many miles in a light year?

What is an astronomical unit?

According to Scientists, what is the age of the solar system?

Pluto is now considered to be a _____________ planet.

What percentage of the solar system is found in the Sun?

What percentage of the sun is made of hydrogen?

Where does nuclear fusion occur?

What two factors are very import when determining if humans could exist on another planet?

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

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

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

These are eruptions on the Sun

Areas of the Sun that appear cooler than surrounding areas.

Mars atmosphere is composed mostly of _______________.

Which inner planet does not have an atmosphere

Where does most of the carbon dioxide on Earth and Mars originate?

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

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