The Sun makes up 99.86% of the total mass of the solar system.
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The light you see from some stars today began traveling before humans existed.
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Some metals such as mercury are liquid at room temperature.
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In 1977, a strong narrowband radio signal known as the 'Wow! signal' was detected from space.
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In 1961, Yuri Gagarin became the first human in space.
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The Earth's gravity keeps the Moon in orbit.
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Black holes can merge and release enormous energy.
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The Great Attractor is a gravitational anomaly influencing the motion of galaxies.
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Rogue planets drift through space without orbiting a star.
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