Some articles on billion years, billions, years, billion:
... As of 2013, this expansion is estimated to have begun 13.798 ± 0.037 billion years ago ... researchers call the development of all this physical structure over billions of years "cosmic evolution." Other, more interdisciplinary, researchers refer to "cosmic ... 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 ...
... 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 Way and there is also a hint of an extinction event at ... Within the last billion years the solar wind has significantly diminished ... the energy output 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 ...
... Law to biological evolution and extrapolating backwards, propose that life began "9.7±2.5 billion years ago", billions of years before the Earth was formed ... suggested a doubling of complexity every 376 million years ... one nucleotide) at "9.7±2.5 billion years ago" ...
... 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 790–63 ...
... 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 containing the words billion years, years and/or billion:
“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)
“Mily: You must remember me!?
Tadeusz: I never remember pretty women. It’s so expensive.
My friend, after twenty thousand years murder is still a business that’s mainly in the hands of amateurs.”
—Orson Welles (1915–1985)
“... men and women are not yet free.... The slavery of greed endures. Little child workers, the hope of the future, are sacrificed to industry. Young men are sent out by the billion to die for profits.... We must destroy industrial slavery and build industrial democracy.... The people everywhere must come into possession of the earth [second, third, and fourth ellipses in source].”
—Sara Bard Field (1882–1974)