Some articles on billion years, billion, years, billions:
... 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 ... Within the last billion years the solar wind has significantly diminished ... long term 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 of stellar ...
... expansion is estimated to have begun 13.798 ± 0.037 billion years ago ... call the development of all this physical structure over billions of years "cosmic evolution." Other, more interdisciplinary, researchers refer to "cosmic evolution" as ... 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 ...
... Law to biological evolution and extrapolating backwards, propose that life began "9.7±2.5 billion years ago", billions of years before the Earth ... case of evolution, empirical evidence suggested a doubling of complexity every 376 million years ... one nucleotide) at "9.7±2.5 billion years ago" ...
... 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 ... Billions of years of erosion and tectonic deformation have exposed the metamorphic rock core of these ancient mountains ...
... 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 million years ago At least ...
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 productiononly to produce a race of bed-wetters!”
—Barbara Ehrenreich (b. 1941)
“In the years of President Ford
Decorum and calm were restored.
He did nothing hateful
For which we were grateful
But terribly, terribly bored.”
“... 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 (18821974)