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There is no air in space, so sound waves cannot travel. This means that if you were to stand on the Moon, you would not be able to hear anything, even if a rocket exploded right next to you.
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Plasma is the fourth state of matter, after solid, liquid, and gas. It is made up of charged particles, like electrons and protons. The Sun is so hot that most of its matter is in the plasma state.
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Scientists estimate that there are about 100 billion galaxies in the universe, and each galaxy contains billions of stars. That means there are more stars in the universe than there are grains of sand on all the beaches on Earth combined.
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This means that the distance between galaxies is getting larger all the time. Scientists are not sure why the universe is expanding, but they think it may be due to a mysterious force called dark energy.
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Black holes are incredibly dense objects with such strong gravity that not even light can escape. The black hole at the center of our Milky Way galaxy is about 4 million times the mass of the Sun.
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Neutron stars are formed when the core of a star collapses in on itself. They are so dense that a teaspoon of neutron star material would weigh about as much as a mountain on Earth.
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This means that the Big Bang, which is thought to be the beginning of the universe, happened about 13.8 billion years ago.
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These stars were much larger and brighter than the stars we see today. They eventually exploded, seeding the universe with heavier elements, like carbon and oxygen.
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These planets, called exoplanets, have been found orbiting other stars. Some of these exoplanets are similar to Earth, and they may even be habitable
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The elements that make up our bodies were created in the cores of stars. When these stars exploded, they scattered these elements throughout the universe, where they eventually came together to form planets and life.
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