Most of the sources of energy we use, represent stored solar energy. Which of the following is NOT ultimately derived from the sun’s energy?

Which of the following planets of our solar system has least mass?

Which one among the following stars is nearest to the earth?

Which one from among the following planets is largest in size?

Which one of the following is a reason why astronomical distances are measured in light-years?

Which one of the following astronomers proved that the Earth and other planets revolve around the Sun ?