Main Page | See live article | Alphabetical index To help compare orders of magnitude of different times this page lists times between 32 000 years and 320 000 years (1012 seconds and 1013 seconds). See also times of other orders of magnitude Shorter times ~75 000 years -- time since a group of humans became the Australian Aborigines 154 000 years -- half-life of neptunium-236 159 200 years -- half-life of uranium-233 211 100 years -- half-life of technetium-99 300 000 years -- time since Homo sapiens separated from Homo erectus 300 000 years -- time after the big bang until cosmic microwave background radiation began Longer times This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.