Billion Years

Some articles on billion years, billion, years, billions:

Paleoclimatologists - Controlling Factors - Very Long Term (109 Years or More)
... The solar minimum around 2.4 billion years ago is consistent with an established cosmic ray flux modulation by a variable star formation rate in the Milky ... Within the last billion years the solar wind has significantly diminished ... of the sun has gradually increased, on the order of 5% per billion (109) years, and will continue to do so until it reaches the end of its current phase of stellar evolution ...
Medea Hypothesis
... Past "suicide attempts" include Methane poisoning, 3.5 billion years ago The oxygen catastrophe, 2.7 billion years ago Snowball earth, twice, 2.3 billion years ago and 790–630 ...
Abiogenesis - Current Models - From Organic Molecules To Protocells - Coenzyme World
... backwards, propose that life began "9.7±2.5 billion years ago", billions of years before the Earth was formed ... of evolution, empirical evidence suggested a doubling of complexity every 376 million years ... one nucleotide) at "9.7±2.5 billion years ago" ...
Timeline Of The Big Bang
... this expansion is estimated to have begun 13.798 ± 0.037 billion years ago ... Some researchers call the development of all this physical structure over billions of years "cosmic evolution." Other, more interdisciplinary, researchers refer to "cosmic evolution" as the entire ... day, scientists anticipate that the Earth will cease to support life in about a billion years, and will be drawn into the Sun in about 5 billion years ...
Mount Elkins - Geology & Orogeny
... formed the cratonic nucleus approximately 4 billion years ago ... Radiometrically dated to as old as 3.8 billion years, some of the zircons collected from the orthogneisses of the Napier Complex are among the oldest rock specimens found on Earth ... Billions of years of erosion and tectonic deformation have exposed the metamorphic rock core of these ancient mountains ...

Famous quotes related to billion years:

    Imagine spending four billion years stocking the oceans with seafood, filling the ground with fossil fuels, and drilling the bees in honey production—only to produce a race of bed-wetters!
    Barbara Ehrenreich (b. 1941)