The range of length scales occurring in the universe is immense! Protons and Neutrons are approximately 10-16 Meters in diameter while the observable universe is estimated to be approximately 4 x 1026 Meters in diameter.
Phenomenon
|
Time
|
Radioactive Decay | |
Polonium 214 | 1.5x10-4 Seconds |
Technetium 99 | 6 Hours |
Iodine 131 | 8 Days |
Strontium 90 | 30 Years |
Plutonium 239 | 2.4x103 Years |
Uranium 235 | 7.1x108 Years |
Rubidium 87 | 5.0x1010 Years |
Medicine | |
Time that it takes a single nerve cell to fire | ~10-3 Seconds |
Respiratory rate of a resting adult human being | 6 to 12 Seconds |
Incubation period of the Influenza Virus | 1 to 5 Days |
Life span of red blood cells | 100 to 120 Days |
Astronomy | |
Venus |
Rotation Period: 243 Earth Days Venusian Year: 224.7 Earth Days |
Mars |
Rotation Period: 24 Hours Martian Year: 687 Earth Days |
Jupiter |
Rotation Period: 9.8 Hours Jovian Year: 11.86 Earth Years |
Saturn |
Rotation Period: 10.2 Hours Saturnian Year: 29.46 Earth Years |
Uranus |
Rotation Period: 17 Hours Uranian Year: 84 Earth Years |
Neptune |
Rotation Period: 16.11 Hours Neptunian Year: 165 Earth Years |
Pluto |
Rotation Period: 6.39 Hours Plutonian Year: 247.7 Earth Years |
Rotation Period of the Sun at the Equator (the Sun does not rotate as a rigid body) | 25 Earth Days |
Time that it takes our solar system to orbit once about the center of the Milky Way Galaxy | 2.3x108 Years |