Earth
Earth is our reference point for scale and tangibility. As a card it helps relate cosmic and microscopic sizes to everyday experience.
astronomy.planets.terrestrial
Metrics
Diameter
Mean diameter of Earth.
Mass
5.972 × 10^24 kg.
Orbital Period
Sidereal year, rounded.
Distance from Sun
Mean distance, corresponds to 1 Astronomical Unit (AU).
Relations
Tangibility: The jump in orders of magnitude from planetary scale to molecular systems becomes experiential.
Explanations
Earth is our yardstick for understanding the universe. With a diameter of 12742 km and a mass of 5.972 × 10^24 kg, it serves as a reference object to make cosmic scales and distances comprehensible. It orbits the Sun in exactly 365.25 days at a distance of approximately 150 million kilometres – a distance that seems unimaginably vast to humans but is relatively close in astronomical terms. Its average temperature of 288 K (about 15 °C) makes it the only known planet with liquid water and life.
Sources
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Provenance
Status
seed
Review
none
Last Updated
2026-02-16