Earth is approximately spherical, not flat.
Measurements from the ground and space agree: Earth is a slightly flattened sphere, with an uneven surface.
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Earth orbits the Sun.
Earth completes an orbit around the Sun in about one year while also rotating on its axis.
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Earth is approximately 4.54 billion years old.
Radiometric dating places Earth’s formation about 4.54 billion years ago, with uncertainty of roughly 50 million years.
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The Moon influences ocean tides.
Differences in the Moon’s gravitational pull across Earth help drive tides. The Sun and local geography matter too.
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The Apollo Moon landings occurred.
Mission records, later images of landing sites and radio reception on Earth provide converging evidence of the landings.
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The universe is expanding.
On large scales, the distances between unbound galaxies grow as the universe expands.
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