What are 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 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 ...
Abiogenesis - Current Models - From Organic Molecules To Protocells - Coenzyme World
... 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" ...
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 million years ...
Timeline Of The Big Bang
... 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 ...
Mount Elkins - Geology & Orogeny
... 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)

    All through the years of our youth
    Neither could have known
    Their own thought from the other’s,
    We were so much at one.
    William Butler Yeats (1865–1939)

    SING a song of ‘sistence
    Pocket full of Eye
    Two billion Turtle-doves
    Mourning in a sty
    Allen Tate (1899–1979)