Like other stars, the Sun is made up mainly of hydrogen gas. The
temperature at the Sun's surface is about 10,000 degrees F, but rises
to about 27,000,000 degrees F at its core. The temperature and
pressure are so high there that nuclear reactions take place. Hydrogen
atoms smash into each other and stick to form helium, and release an
enormous amount of energy in the process.
Shop Windows to the Universe Science Store!Cool It!
is the new card game from the Union of Concerned Scientists that teaches kids about the choices we have when it comes to climate change—and how policy and technology decisions made today will matter. Cool It! is available in our online store