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Planets
Tap a planet to learn its size, distance, day and year length, moons, atmosphere, temperature, and notable features.
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Earth
Size
6,371 km
1.00⊕
Distance
1 AU
150 M km
Day
23.93h
Year
365.256d
Moons
1
Temp
15°C
Atmosphere
78% N₂, 21% O₂
Notable Features
- ●Only known world with life; 71% water ocean, 29% land
- ●Diameter: 12,742 km; mass 5.972 × 10²⁴ kg
- ●Third planet from Sun: 149.6 million km (1 AU by definition)
- ●One moon; day 23 hours 56 minutes, year 365.256 days
- ●Protective magnetic field and ozone layer shield from solar radiation
Source: NASA Planetary Fact Sheet — Earth
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Definitions
Schwarzschild Radius
Event horizon boundary: rs = 2GM/c²
Photon Sphere
Unstable light orbit at 1.5× rs
ISCO
Innermost stable orbit at 3× rs
Hawking Temperature
Black hole thermal radiation
Terminator
Day-night boundary on planets
On the Moment, the Eternal, and What We See
Charles Baudelaire wrote of modernity as “the ephemeral, the fugitive, the contingent”–and that “it is one half of art, the other half being the eternal and the immutable.” A planet spinning on its tilted axis, light catching clouds, the moment a world rotates under the distant Sun—these fleeting details carry something that lasts forever.
Read on Modernity →