Curated category
Environments
- UniverseTime began at zero, a moment known as the Planck epoch. This brief period extended from time zero to one Planck time unit of approximately 10 minus 43…
- Atmosphere of EarthA dry breath of air contains 78.08% nitrogen and 20.95% oxygen by mole fraction. Argon makes up 0.93% of the mixture, while carbon dioxide accounts for just…
- Outer spaceThe baseline temperature of outer space, as set by the background radiation from the Big Bang, is 2.725 kelvins. This near-perfect vacuum contains ultra-low…