Retrospective birth dating of cells in humans

The Earth has over 4 billion years left in its life, but humans only have around a billion years left before we have to find a new home. Oxygen is what makes the sky blue, molecules in the air scatter blue light from the sun more than they scatter red light.We might have even less time if we don't start making improvements. New type of Green Algae produced O2, which created the Ozone Layer that protected life from damaging UV Rays and gave life a chance to progress.It is the longest of the Phanerozoic eras, lasting from 541 to 251.902 million years ago, Phanerozoic covers 541 million years to the present.

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Ions can be created, by either chemical or physical means, via ionization. Theia collided with another planetary-mass object, Gaia (the early Earth) around 4.51 billion years ago.

And as you got closer, it would almost disappear because of the tremendous amount of space there is between everything, like with atoms.

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.

Over the following 70 to 80 million years, the rate of diversification accelerated by an order of magnitude and the diversity of life began to resemble that of today.

Almost all the present phyla plants (Asterids - Verbena) appeared during this period, with the exception of Bryozoa, which are a phylum of aquatic invertebrate animals who made its earliest known appearance later, in the Lower Ordovician.

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