___ is a unit of length, roughly the distance from Earth to the Sun.
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The ozone layer protects us from harmful _______________ rays of the sun.
Earth is the _______ planet from the Sun.
Uranus is the _______ planet from the Sun.
Mercury is the _______ planet from the Sun.
Earth revolves around Sun. Who was the 1st one to present this theory?
Mars is the _______ planet from the Sun.
Venus is the _______ planet from the Sun.