17.Why does our sun give off light? a. The sun redirects and focuses energy from other planets.
b. Nuclear fission in the sun’s core generates photons.
c. Nuclear fusion in the sun’s core generates photons.
d. As the sun spins, it loses light which travels towards us.

Why does earth rotate? because earth is formed from cold gases collapsing due to gravity because the matter in the nebula that formed earth was spinning because earth forms more than 99% of the mass of the solar system because the hydrogen atoms inside the nebula fused to form helium

Why is the bottom layer of a trophic pyrimid the

In medium-sized stars such as the sun, nuclear fusion almost always means the fusing of nuclei to form , but larger stars can produce elements as heavy as