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 ... Within the last billion years the solar wind has significantly diminished ... 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 ...
... propose that life began "9.7±2.5 billion years ago", billions of years before the Earth was formed ... In the case of evolution, empirical evidence 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 790–630 million years ...
... 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 ... will cease to support life in about a billion years, and will be drawn into the Sun in about 5 billion years ...
... 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 productiononly to produce a race of bed-wetters!”
—Barbara Ehrenreich (b. 1941)
“All through the years of our youth
Neither could have known
Their own thought from the others,
We were so much at one.”
—William Butler Yeats (18651939)
“SING a song of sistence
Pocket full of Eye
Two billion Turtle-doves
Mourning in a sty”
—Allen Tate (18991979)