To help compare orders of magnitude of different times this page lists times between 1017 seconds and 1018 seconds (3.2 and 32 billion
1000000000 (numbe
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To help compare orders of magnitude of different times this page lists times between 1017 seconds and 1018 seconds (3.2 and 32 billion
1000000000 (number)
1,000,000,000 is the natural number following 999,999,999 and preceding 1,000,000,001.In scientific notation, it is written as 109.... years) See alsotimes of other orders of magnitude
To help compare orders of magnitude of different times this page lists times between 1016 seconds and 1017 seconds . See also Orders of magnitude ....
3.9 to 4.1 billion years — age of oldest cellular life (cyanobacteria
Cyanobacteria
Cyanobacteria, also known as blue-green algae, blue-green bacteria or Cyanophyta, is a phylum of bacteria that obtain their energy through photosynthesis.... )
3.7 to 3.9 billion (3.7e9 to 3.9e9) years — age of the Mare Imbrium
Mare Imbrium
Mare Imbrium, Latin for "Sea of Showers" or "Sea of Rains", is a vast lunar mare filling a basin on Earth's Moon. Mare Imbrium was created when lava flooded the giant Impact crater formed when a very large object hit the Moon long ago.... , the Lower Imbrian
Lower Imbrian
In the lunar geologic timescale, the Lower Imbrian epoch occurred between 3850 million years ago to about 3800 million years ago. It overlaps the end of the Late Heavy Bombardment of the inner solar system.... epoch
The half-life of a quantity whose value decreases with time is the interval required for the quantity to decay to half of its initial value. The concept originated in describing how long it takes atoms to undergo radioactive decay but also applies in a wide variety of other situations.... of uranium-238
Uranium-238
Uranium-238 , is the most common Isotopes of uranium of uranium found in nature. When hit by a neutron, it becomes uranium-239 , an unstable isotope which radioactive decay into neptunium-239 , which then itself decays, with a half-life of 2.355 days, into plutonium-239 ....
Modern Geology and geophysicists consider the age of the Earth to be around 1 E17 s This age has been determined by Radiometric dating of meteorite material and is consistent with the ages of the oldest-known terrestrial and Earth's moon Moon rock.... (see: Precambrian
Precambrian
The Precambrian is an informal name for the supereon comprising the eon of the geologic timescale that came before the current Phanerozoic eon.... )
The main sequence is a continuous and distinctive band of stars that appear on plots of stellar Color index versus brightness. These color-absolute magnitude plots are known as Hertzsprung-Russell diagrams after their co-developers, Ejnar Hertzsprung and Henry Norris Russell.... lifetime of a G2 dwarf star (like the Sun
Sun
The Sun , a G V star, is the star at the center of the Solar System. The Earth and other matter orbit the Sun, which by itself accounts for about 98.6% of the Solar System's mass.... )
13.7 ± 0.2 billion years (4e17 seconds) — estimated age of the universe
Universe
The universe is defined as everything that physically exists: the entirety of space and time, all forms of matter, energy and momentum, and the physical laws and physical constants that govern them.... according to the Big Bang
Big Bang
The Big Bang is the physical cosmology model of the initial conditions and subsequent development of the universe supported by the most comprehensive and accurate explanations from current scientific method and observation.... theory
20 billion years — time until the end of the universe in the Big Rip
Big Rip
The Big Rip is a physical cosmology hypothesis first published in 2003, about the ultimate fate of the universe, in which the matter of universe, from stars and galaxies to atoms and subatomic particles, are progressively torn apart by the metric expansion of space at a certain time in the future.... scenario
