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Four radioisotopes commonly used radiometric dating

The photo above is not to make you feel insignificant, it is only for reference and scale. Depending on your field of view, you would have to be around 100,000 light years away to see this Galaxy using the naked human eye.

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Dinosaurs are a diverse group of Reptiles of the clade Dinosauria that first appeared during the Triassic period, which was a geologic period and system which spans 50.9 million years from the end of the Permian Period 252.17 million years ago (Mya), to the beginning of the Jurassic Period 201.3 Mya.

Earth had 1 Continent, mostly desert, no broad leaf trees, no flowers, Earth spun faster, moon was closer.

Pangaea started braking apart about 200 million years ago.

The Scale of the Universe from Big to Small (youtube) The Scale of the Universe from Small to Big (youtube) NASA Astronomy Picture of the Day (APOD) The Scale of the Universe - Interactive (manual control scale) Sizes (nano) It is believed that our Universe began.

(Not sure if it was the first time or even the beginning of time? Reionization marks the point at which the hydrogen in the Universe became ionized.

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