The Earth loses about 95,000 tons of hydrogen and helium to space each year.
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The Milky Way is estimated to be over 100,000 light-years wide.
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Project Mercury was the first U.S. human spaceflight program.
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Interstellar objects have passed through our solar system.
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The observable universe is about 93 billion light‑years wide.
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Rogue planets drift through space without orbiting a star.
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Black holes can slow time so much that seconds near them equal years far away.
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The Earth's orbit around the Sun is slightly elliptical.
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The Voyager probes have traveled beyond the heliosphere.
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