The Hubble constant — the universe's expansion rate — has been measured with increasing precision since the 1920s.
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Neutron stars are so dense that a single teaspoon would weigh billions of tons on Earth.
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Venus has surface temperatures hot enough to melt lead.
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The Mars Pathfinder mission tested new landing techniques.
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The Great Attractor is a gravitational anomaly influencing the motion of galaxies.
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Dark energy is thought to drive the accelerating expansion of the universe.
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Venus has a thick atmosphere that traps heat.
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The observable universe is about 93 billion light‑years wide.
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