Convert Shakes to Gigayears
Convert Shakes (sh) to Gigayears (Ga) instantly and accurately.
Conversion Formula
Ga = sh × 3.168873851e-25
About Shakes
A shake = exactly 10 ns (10⁻⁸ s) - the informal unit for fission prompt-neutron generation time, coined at Los Alamos during the Manhattan Project (1943-1945). A prompt-neutron generation in a supercritical core takes ~1-10 shakes; a full explosive chain reaction unfolds over ~50-100 shakes. The name alludes to 'two shakes of a lamb's tail'. Still used in reactor physics and weapons-design calculations. 1 shake = 10 ns.
About Gigayears
A gigayear (1 Ga) = 10⁹ yr ≈ 3.156 × 10¹⁶ s - the timescale of stellar evolution and cosmology. Universe age: 13.787 ± 0.020 Ga (Planck CMB). Sun: 4.603 Ga old; red giant in ~5 Ga. A 0.1 M☉ red dwarf lives ~10,000 Ga. Uranium-238 half-life = 4.468 Ga (used in radiometric dating). Proton decay (GUT prediction): ~10³⁴ yr = ~10²⁵ Ga. 1 Ga = 10⁹ yr.
Quick Reference Table
| Shakes (sh) | Gigayears (Ga) |
|---|---|
| 1 sh | 3.169 × 10-25 Ga |
| 2 sh | 6.338 × 10-25 Ga |
| 5 sh | 1.584 × 10-24 Ga |
| 10 sh | 3.169 × 10-24 Ga |
| 25 sh | 7.922 × 10-24 Ga |
| 50 sh | 1.584 × 10-23 Ga |
| 100 sh | 3.169 × 10-23 Ga |