Atmosphere

The Sun is huge. It's bigger than huge. It's so big that 1.3 million Earths would fit inside a hollowed-out   Sun. It's really far away, too - about 150 million kilometers (93 million miles) Even at that distance the Sun   affects everything on Earth. All the energy we have comes, or once came from, the Sun. That includes   energy to light a lamp, energy to kick a soccer ball, and energy in batteries that play your personal stereo.   We're talking about nearly all of the energy. There's a little bit of energy that comes from nuclear reactions   deep in the Earth's core. But that energy pales compared with the nuclear fusion fueling the Sun. Without   the Sun, the Earth would be a big hunk of rock with nearly nothing on it.   The Sun is made of gas. It has so much gravity that it's atoms are smashed into hot gas. In the sun, atoms   of gas are constantly crashing into each other. When they collide, they form new atoms and release energy.   Scientists call this atom smashing ""nuclear fus