Convert Millennia to Gigayears
Convert Millennia (ka) to Gigayears (Ga) instantly and accurately.
Conversion Formula
Ga = ka × 1.000000000e-6
About Millennia
A millennium (1 ka) = 1,000 Gregorian years ≈ 3.156 × 10¹⁰ s. Standard unit in archaeology and Quaternary geology: Neolithic transition ~10-12 ka BP; Last Glacial Maximum ~21 ka BP; Homo sapiens leaving Africa ~60-70 ka BP. Milankovitch cycles include the 41 ka obliquity and ~100 ka eccentricity cycle. EPICA Antarctic ice core spans ~800 ka. Precession completes ~26 ka. 1 ka = 1,000 yr.
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
| Millennia (ka) | Gigayears (Ga) |
|---|---|
| 1 ka | 1 × 10-6 Ga |
| 2 ka | 2 × 10-6 Ga |
| 5 ka | 5 × 10-6 Ga |
| 10 ka | 1 × 10-5 Ga |
| 25 ka | 2.5 × 10-5 Ga |
| 50 ka | 5 × 10-5 Ga |
| 100 ka | 1 × 10-4 Ga |