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A graphical view of the Cosmic Calendar, featuring the months of the year, days of December, the final minute, and the final second. The Cosmic Calendar is a method to visualize the chronology of the universe, scaling its currently understood age of 13.787 billion years to a single year in order to help intuit it for pedagogical purposes in science education or popular science.
In physical cosmology, the age of the universe is the time elapsed since the Big Bang: 13.8 billion years. [1] Astronomers have two different approaches to determine the age of the universe.
The thin disk of our galaxy began to form when the universe was about 5 billion years old or 9 ± 2 Gya. [15] The Solar System formed at about 9.2 billion years (4.6 Gya), [ 5 ] : 22.2.3 with the earliest evidence of life on Earth emerging by about 10 billion years (3.8 Gya).
First logo used from 2010 to 2017. The 2b2t Minecraft server was founded in December 2010; it has run consistently without a reset since then. [6] [1] The founders are anonymous, [7] choosing to remain unknown or known only via usernames; the most prominent founder is commonly referred to as "Hausemaster".
Minecraft is a media franchise developed from and centered around the video game of the same name.Developed by Mojang Studios (formerly known as Mojang AB) and Xbox Game Studios, which are owned by Microsoft Corporation, the franchise consists of five video games, along with various books, merchandise, events, board games, and an upcoming theatrical film.
The lookback time, , is an age difference: the age of the universe now, , minus the age of the universe when an photon was emitted at a distant location, . The lookback time depends upon the cosmological model: = ′ (+ ′) (′) where = (+) + (+) + and means the present day density parameters for mass and is the cosmological constant. [8]
One quintillionth of a second. atomic time ~ 24.2 × 10 −18 s: Derived from atomic theory of hydrogen. femtosecond: 10 −15 s: One quadrillionth of a second. svedberg: 10 −13 s: Time unit used for sedimentation rates (usually of proteins). picosecond: 10 −12 s: One trillionth of a second. nanosecond: 10 −9 s: One billionth of a second.
However, as the temperature of the universe continued to fall, hadron–anti-hadron pairs were no longer produced. Most of the hadrons and anti-hadrons were then eliminated in particle–antiparticle annihilation reactions, leaving a small residual of hadrons by the time the universe was about one second old. [137]: 244–266