150 relations: Age of the Earth, Age of the universe, Alpha decay, Anno Domini, Antihydrogen, Antimatter, Asteroid, Atomic nucleus, Attosecond, Australopithecus, Bahá'í calendar, Baryon, Base unit (measurement), Big Bang, Big Rip, Bird, Bismuth, Black dwarf, Bottom quark, Brahma, Bromine, Calendar, Cambrian explosion, Century, Chicxulub crater, Coba, Coordinated Universal Time, Cosmic microwave background, Cretaceous–Paleogene extinction event, Dark energy, Day, Decimal, Developed country, Digital clock, Dinosaur, Duodecimal, Earth, Ediacaran biota, Electronvolt, Elementary particle, Epoch (geology), Era (geology), Ergodic hypothesis, Eternal inflation, Europe, Exponential decay, Feature film, February, Femtochemistry, Femtosecond, ..., Future of an expanding universe, Galactic year, Gamma ray, Geologic time scale, Geology, Glacial period, Gregorian calendar, Half-life, Hard disk drive performance characteristics, Hawking radiation, Heat death of the universe, Higgs boson, Hindu mythology, Hindu units of time, Holocene, Hour, Inflation (cosmology), Inflaton, International System of Units, Jesus, Julian calendar, Julian year (astronomy), Kalpa (aeon), Kilometre, Leap second, Leap year, Life expectancy, Linda Schele, List of mammalian gestation durations, Logarithmic timeline, Long and short scales, Loschmidt's paradox, Luminosity, Main sequence, Mass, Mesoamerican Long Count calendar, Metre per second, Mexico, Microsecond, Milky Way, Millennium, Millisecond, Minicomputer, Minute, Moon, Multicellular organism, Myr, Names of large numbers, Nanometre, Nanosecond, Natural units, Orbital period, Order of magnitude, Orders of magnitude (frequency), Pangaea, Permian–Triassic extinction event, Photodissociation, Photon, Physical Review Letters, Picosecond, Planck length, Planck mass, Planck time, Planck units, Poincaré recurrence theorem, Proton decay, Quantum gravity, Quaternary glaciation, Red dwarf, Reflex, Rest frame, Second, Sexagesimal, Siberian Traps, Solar mass, Solar time, Species, Stellar evolution, Sun, Super-Kamiokande, Supercontinent, Supermassive black hole, Temporal resolution, Tidal acceleration, Time, Timekeeping on Mars, Transition state, Types of volcanic eruptions, Ultimate fate of the universe, Ultraviolet, Universe, Unix time, Uranium, Week, Year, Yocto-, YouTube, Zepto-, 12-hour clock, 24-hour clock. Expand index (100 more) » « Shrink index
The age of the Earth is 4.54 ± 0.05 billion years This age may represent the age of the Earth’s accretion, of core formation, or of the material from which the Earth formed.
In physical cosmology, the age of the universe is the time elapsed since the Big Bang.
Alpha decay or α-decay is a type of radioactive decay in which an atomic nucleus emits an alpha particle (helium nucleus) and thereby transforms or 'decays' into an atom with a mass number that is reduced by four and an atomic number that is reduced by two.
The terms anno Domini (AD) and before Christ (BC) are used to label or number years in the Julian and Gregorian calendars.
Antihydrogen is the antimatter counterpart of hydrogen.
In modern physics, antimatter is defined as a material composed of the antiparticle (or "partners") to the corresponding particles of ordinary matter.
Asteroids are minor planets, especially those of the inner Solar System.
The atomic nucleus is the small, dense region consisting of protons and neutrons at the center of an atom, discovered in 1911 by Ernest Rutherford based on the 1909 Geiger–Marsden gold foil experiment.
An attosecond is 1×10−18 of a second (one quintillionth of a second).
Australopithecus (informal australopithecine or australopith, although the term australopithecine has a broader meaning as a member of the subtribe Australopithecina which includes this genus as well as Paranthropus, Kenyanthropus, Ardipithecus, and Praeanthropus) is an extinct genus of hominins.
The Bahá'í calendar, also called the Badíʿ calendar (Badíʿ means wondrous or unique), is a solar calendar with years composed of 19 months of 19 days each (361 days) plus an extra period of "Intercalary Days".
A baryon is a composite subatomic particle made up of three quarks (a triquark, as distinct from mesons, which are composed of one quark and one antiquark).
A base unit (also referred to as a fundamental unit) is a unit adopted for measurement of a base quantity.
The Big Bang theory is the prevailing cosmological model for the universe from the earliest known periods through its subsequent large-scale evolution.
In physical cosmology, the Big Rip is a hypothetical cosmological model concerning the ultimate fate of the universe, in which the matter of the universe, from stars and galaxies to atoms and subatomic particles, and even spacetime itself, is progressively torn apart by the expansion of the universe at a certain time in the future.
Birds, also known as Aves, are a group of endothermic vertebrates, characterised by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a strong yet lightweight skeleton.
Bismuth is a chemical element with symbol Bi and atomic number 83.
A black dwarf is a theoretical stellar remnant, specifically a white dwarf that has cooled sufficiently that it no longer emits significant heat or light.
The bottom quark or b quark, also known as the beauty quark, is a third-generation quark with a charge of − ''e''.
Brahma (Sanskrit: ब्रह्मा, IAST: Brahmā) is a creator god in Hinduism.
Bromine is a chemical element with symbol Br and atomic number 35.
A calendar is a system of organizing days for social, religious, commercial or administrative purposes.
The Cambrian explosion or Cambrian radiation was an event approximately in the Cambrian period when most major animal phyla appeared in the fossil record.
A century (from the Latin centum, meaning one hundred; abbreviated c.) is a period of 100 years.
The Chicxulub crater is an impact crater buried underneath the Yucatán Peninsula in Mexico.
Coba (Cobá) is an ancient Mayan city on the Yucatán Peninsula, located in the Mexican state of Quintana Roo.
The cosmic microwave background (CMB, CMBR) is electromagnetic radiation as a remnant from an early stage of the universe in Big Bang cosmology.
The Cretaceous–Paleogene (K–Pg) extinction event, also known as the Cretaceous–Tertiary (K–T) extinction, was a sudden mass extinction of some three-quarters of the plant and animal species on Earth, approximately 66 million years ago.
In physical cosmology and astronomy, dark energy is an unknown form of energy which is hypothesized to permeate all of space, tending to accelerate the expansion of the universe.
A day, a unit of time, is approximately the period of time during which the Earth completes one rotation with respect to the Sun (solar day).
The decimal numeral system (also called base-ten positional numeral system, and occasionally called denary) is the standard system for denoting integer and non-integer numbers.
A developed country, industrialized country, more developed country, or "more economically developed country" (MEDC), is a sovereign state that has a highly developed economy and advanced technological infrastructure relative to other less industrialized nations.
A digital clock is a type of clock that displays the time digitally (i.e. in numerals or other symbols), as opposed to an analog clock, where the time is indicated by the positions of rotating hands.
Dinosaurs are a diverse group of reptiles of the clade Dinosauria.
The duodecimal system (also known as base 12 or dozenal) is a positional notation numeral system using twelve as its base.
Earth is the third planet from the Sun and the only astronomical object known to harbor life.
The Ediacaran (formerly Vendian) biota consisted of enigmatic tubular and frond-shaped, mostly sessile organisms that lived during the Ediacaran Period (ca. 635–542 Mya).
In physics, the electronvolt (symbol eV, also written electron-volt and electron volt) is a unit of energy equal to approximately joules (symbol J).
In particle physics, an elementary particle or fundamental particle is a particle with no substructure, thus not composed of other particles.
In geochronology, an epoch is a subdivision of the geologic timescale that is longer than an age but shorter than a period.
A geologic era is a subdivision of geologic time that divides an eon into smaller units of time.
In physics and thermodynamics, the ergodic hypothesis says that, over long periods of time, the time spent by a system in some region of the phase space of microstates with the same energy is proportional to the volume of this region, i.e., that all accessible microstates are equiprobable over a long period of time.
Eternal inflation is a hypothetical inflationary universe model, which is itself an outgrowth or extension of the Big Bang theory.
Europe is a continent located entirely in the Northern Hemisphere and mostly in the Eastern Hemisphere.
A quantity is subject to exponential decay if it decreases at a rate proportional to its current value.
A feature film is a film (also called a motion picture or movie) with a running time long enough to be considered the principal or sole film to fill a program.
February is the second and shortest month of the year in the Julian and Gregorian calendar with 28 days in common years and 29 days in leap years, with the quadrennial 29th day being called the leap day.
Femtochemistry is the area of physical chemistry that studies chemical reactions on extremely short timescales (approximately 10−15 seconds or one femtosecond, hence the name) in order to study the very act of atoms within molecules (reactants) rearranging themselves to form new molecules (products).
A femtosecond is the SI unit of time equal to 10−15 or 1/1,000,000,000,000,000 of a second; that is, one quadrillionth, or one millionth of one billionth, of a second.
Observations suggest that the expansion of the universe will continue forever.
The galactic year, also known as a cosmic year, is the duration of time required for the Sun to orbit once around the center of the Milky Way Galaxy.
A gamma ray or gamma radiation (symbol γ or \gamma), is penetrating electromagnetic radiation arising from the radioactive decay of atomic nuclei.
The geologic time scale (GTS) is a system of chronological dating that relates geological strata (stratigraphy) to time.
Geology (from the Ancient Greek γῆ, gē, i.e. "earth" and -λoγία, -logia, i.e. "study of, discourse") is an earth science concerned with the solid Earth, the rocks of which it is composed, and the processes by which they change over time.
A glacial period (alternatively glacial or glaciation) is an interval of time (thousands of years) within an ice age that is marked by colder temperatures and glacier advances.
The Gregorian calendar is the most widely used civil calendar in the world.
Half-life (symbol t1⁄2) is the time required for a quantity to reduce to half its initial value.
Higher performance in hard disk drives comes from devices which have better performance characteristics.
Hawking radiation is blackbody radiation that is predicted to be released by black holes, due to quantum effects near the event horizon.
The heat death of the universe is a plausible ultimate fate of the universe in which the universe has diminished to a state of no thermodynamic free energy and therefore can no longer sustain processes that increase entropy.
The Higgs boson is an elementary particle in the Standard Model of particle physics.
Hindu mythology are mythical narratives found in Hindu texts such as the Vedic literature, epics like Mahabharata and Ramayana, the Puranas, the regional literatures Sangam literature and Periya Puranam.
Hindu texts describe units of Kala measurements, from microseconds to Trillions of years.
The Holocene is the current geological epoch.
An hour (symbol: h; also abbreviated hr.) is a unit of time conventionally reckoned as of a day and scientifically reckoned as 3,599–3,601 seconds, depending on conditions.
In physical cosmology, cosmic inflation, cosmological inflation, or just inflation, is a theory of exponential expansion of space in the early universe.
The inflaton field is a hypothetical scalar field that is theorized to drive cosmic inflation in the very early universe.
The International System of Units (SI, abbreviated from the French Système international (d'unités)) is the modern form of the metric system, and is the most widely used system of measurement.
Jesus, also referred to as Jesus of Nazareth and Jesus Christ, was a first-century Jewish preacher and religious leader.
The Julian calendar, proposed by Julius Caesar in 46 BC (708 AUC), was a reform of the Roman calendar.
In astronomy, a Julian year (symbol: a) is a unit of measurement of time defined as exactly 365.25 days of SI seconds each.
Kalpa (कल्प kalpa) is a Sanskrit word meaning a relatively long period of time (by human calculation) in Hindu and Buddhist cosmology.
The kilometre (International spelling as used by the International Bureau of Weights and Measures; SI symbol: km; or) or kilometer (American spelling) is a unit of length in the metric system, equal to one thousand metres (kilo- being the SI prefix for). It is now the measurement unit used officially for expressing distances between geographical places on land in most of the world; notable exceptions are the United States and the road network of the United Kingdom where the statute mile is the official unit used.
A leap second is a one-second adjustment that is occasionally applied to Coordinated Universal Time (UTC) in order to keep its time of day close to the mean solar time as realized by UT1.
A leap year (also known as an intercalary year or bissextile year) is a calendar year containing one additional day (or, in the case of lunisolar calendars, a month) added to keep the calendar year synchronized with the astronomical or seasonal year.
Life expectancy is a statistical measure of the average time an organism is expected to live, based on the year of its birth, its current age and other demographic factors including gender.
Linda Schele (October 30, 1942 – April 18, 1998) was an expert in the field of Maya epigraphy and iconography.
A logarithmic timeline is a timeline laid out according to a logarithmic scale.
The long and short scales are two of several large-number naming systems for integer powers of ten that use the same words with different meanings.
Loschmidt's paradox, also known as the reversibility paradox, irreversibility paradox or Umkehreinwand, is the objection that it should not be possible to deduce an irreversible process from time-symmetric dynamics.
In astronomy, luminosity is the total amount of energy emitted per unit of time by a star, galaxy, or other astronomical object.
In astronomy, the main sequence is a continuous and distinctive band of stars that appear on plots of stellar color versus brightness.
Mass is both a property of a physical body and a measure of its resistance to acceleration (a change in its state of motion) when a net force is applied.
The Mesoamerican Long Count calendar is a non-repeating, vigesimal (base-20) and base-18 calendar used by several pre-Columbian Mesoamerican cultures, most notably the Maya.
Metre per second (American English: meter per second) is an SI derived unit of both speed (scalar) and velocity (vector quantity which specifies both magnitude and a specific direction), defined by distance in metres divided by time in seconds.
Mexico (México; Mēxihco), officially called the United Mexican States (Estados Unidos Mexicanos) is a federal republic in the southern portion of North America.
A microsecond is an SI unit of time equal to one millionth (0.000001 or 10−6 or 1/1,000,000) of a second.
The Milky Way is the galaxy that contains our Solar System.
A millennium (plural millennia or, rarely, millenniums) is a period equal to 1000 years, also called kiloyears.
A millisecond (from milli- and second; symbol: ms) is a thousandth (0.001 or 10−3 or 1/1000) of a second.
A minicomputer, or colloquially mini, is a class of smaller computers that was developed in the mid-1960s and sold for much less than mainframe and mid-size computers from IBM and its direct competitors.
The minute is a unit of time or angle.
The Moon is an astronomical body that orbits planet Earth and is Earth's only permanent natural satellite.
Multicellular organisms are organisms that consist of more than one cell, in contrast to unicellular organisms.
The abbreviation myr, "million years", is a unit of a quantity of (i.e.) years, or 31.6 teraseconds.
This article lists and discusses the usage and derivation of names of large numbers, together with their possible extensions.
The nanometre (International spelling as used by the International Bureau of Weights and Measures; SI symbol: nm) or nanometer (American spelling) is a unit of length in the metric system, equal to one billionth (short scale) of a metre (m).
A nanosecond (ns) is an SI unit of time equal to one thousand-millionth of a second (or one billionth of a second), that is, 1/1,000,000,000 of a second, or 10 seconds.
In physics, natural units are physical units of measurement based only on universal physical constants.
The orbital period is the time a given astronomical object takes to complete one orbit around another object, and applies in astronomy usually to planets or asteroids orbiting the Sun, moons orbiting planets, exoplanets orbiting other stars, or binary stars.
An order of magnitude is an approximate measure of the number of digits that a number has in the commonly-used base-ten number system.
To help compare different orders of magnitude, the following list describes various frequencies, which is measured in hertz.
Pangaea or Pangea was a supercontinent that existed during the late Paleozoic and early Mesozoic eras.
The Permian–Triassic (P–Tr or P–T) extinction event, colloquially known as the Great Dying, the End-Permian Extinction or the Great Permian Extinction, occurred about 252 Ma (million years) ago, forming the boundary between the Permian and Triassic geologic periods, as well as the Paleozoic and Mesozoic eras.
Photodissociation, photolysis, or photodecomposition is a chemical reaction in which a chemical compound is broken down by photons.
The photon is a type of elementary particle, the quantum of the electromagnetic field including electromagnetic radiation such as light, and the force carrier for the electromagnetic force (even when static via virtual particles).
Physical Review Letters (PRL), established in 1958, is a peer-reviewed, scientific journal that is published 52 times per year by the American Physical Society.
A picosecond is an SI unit of time equal to 10−12 or 1/1,000,000,000,000 (one trillionth) of a second.
In physics, the Planck length, denoted, is a unit of length, equal to metres.
In physics, the Planck mass, denoted by mP, is the unit of mass in the system of natural units known as Planck units.
In quantum mechanics, the Planck time is the unit of time in the system of natural units known as Planck units.
In particle physics and physical cosmology, Planck units are a set of units of measurement defined exclusively in terms of five universal physical constants, in such a manner that these five physical constants take on the numerical value of 1 when expressed in terms of these units.
In physics, the Poincaré recurrence theorem states that certain systems will, after a sufficiently long but finite time, return to a state very close to, if not exactly the same as, the initial state.
In particle physics, proton decay is a hypothetical form of radioactive decay in which the proton decays into lighter subatomic particles, such as a neutral pion and a positron.
Quantum gravity (QG) is a field of theoretical physics that seeks to describe gravity according to the principles of quantum mechanics, and where quantum effects cannot be ignored, such as near compact astrophysical objects where the effects of gravity are strong.
The Quaternary glaciation, also known as the Quaternary Ice Age or Pleistocene glaciation, is a series of glacial events separated by interglacial events during the Quaternary period from 2.58 Ma (million years ago) to present.
A red dwarf (or M dwarf) is a small and relatively cool star on the main sequence, of M spectral type.
A reflex, or reflex action, is an involuntary and nearly instantaneous movement in response to a stimulus.
In special relativity the rest frame of a particle is the coordinate system (frame of reference) in which the particle is at rest.
The second is the SI base unit of time, commonly understood and historically defined as 1/86,400 of a day – this factor derived from the division of the day first into 24 hours, then to 60 minutes and finally to 60 seconds each.
Sexagesimal (base 60) is a numeral system with sixty as its base.
The Siberian Traps (Сибирские траппы, Sibirskiye trappy) is a large region of volcanic rock, known as a large igneous province, in Siberia, Russia.
The solar mass is a standard unit of mass in astronomy, equal to approximately.
Solar time is a calculation of the passage of time based on the position of the Sun in the sky.
In biology, a species is the basic unit of classification and a taxonomic rank, as well as a unit of biodiversity, but it has proven difficult to find a satisfactory definition.
Stellar evolution is the process by which a star changes over the course of time.
The Sun is the star at the center of the Solar System.
Super-Kamiokande (semi-abbreviation of full name: Super-Kamioka Neutrino Detection Experiment, also abbreviated to Super-K or SK; スーパーカミオカンデ) is a neutrino observatory located under Mount Ikeno near the city of Hida, Gifu Prefecture, Japan.
In geology, a supercontinent is the assembly of most or all of Earth's continental blocks or cratons to form a single large landmass.
A supermassive black hole (SMBH or SBH) is the largest type of black hole, on the order of hundreds of thousands to billions of solar masses, and is found in the centre of almost all currently known massive galaxies.
Temporal resolution (TR) refers to the precision of a measurement with respect to time.
Tidal acceleration is an effect of the tidal forces between an orbiting natural satellite (e.g. the Moon), and the primary planet that it orbits (e.g. Earth).
Time is the indefinite continued progress of existence and events that occur in apparently irreversible succession from the past through the present to the future.
Various schemes have been used or proposed for timekeeping on the planet Mars independently of Earth time and calendars.
The transition state of a chemical reaction is a particular configuration along the reaction coordinate.
Several types of volcanic eruptions—during which lava, tephra (ash, lapilli, volcanic bombs and volcanic blocks), and assorted gases are expelled from a volcanic vent or fissure—have been distinguished by volcanologists.
The ultimate fate of the universe is a topic in physical cosmology, whose theoretical restrictions allow possible scenarios for the evolution and ultimate fate of the universe to be described and evaluated.
Ultraviolet (UV) is electromagnetic radiation with a wavelength from 10 nm to 400 nm, shorter than that of visible light but longer than X-rays.
The Universe is all of space and time and their contents, including planets, stars, galaxies, and all other forms of matter and energy.
Unix time (also known as POSIX time or UNIX Epoch time) is a system for describing a point in time, defined as the number of seconds that have elapsed since 00:00:00 Coordinated Universal Time (UTC), Thursday, 1 January 1970,.
Uranium is a chemical element with symbol U and atomic number 92.
A week is a time unit equal to seven days.
A year is the orbital period of the Earth moving in its orbit around the Sun.
Yocto (symbol y) is a unit prefix in the metric system denoting a factor of 10−24 or.
YouTube is an American video-sharing website headquartered in San Bruno, California.
Zepto (unit symbol z) is a unit prefix in the metric system denoting a factor of 10−21 or.
The 12-hour clock is a time convention in which the 24 hours of the day are divided into two periods: "The use of AM or PM to designate either noon or midnight can cause ambiguity.
The 24-hour clock is the convention of time keeping in which the day runs from midnight to midnight and is divided into 24 hours, indicated by the hours passed since midnight, from 0 to 23.
1 E -43 s, 1 E s, 1 E-19 s, 1 E-20 s, 1 E-21 s, 1 E-22 s, 1 E-23 s, 1 E-24 s, 1 E-25 s, 1 E-25 s and less, 1 E-26 s, 1 E-42 s, 1 E-43 s, 1 E12 s, 1 E13 s, 1 E14 s, 1 E15 s, 1 E16 s, 1 E17 s, 1 E18 s, 1 E18 s and longer, 1 E18 s and more, 1 E19 s, 1 E19 s and more, 1 E20 s, 1 E21 s, 1 E22 s, 1 E23 s, 1 E24 s, 1 E25 s, 1 E26 s, 1 E3 s, 1 E38 s, 1 E39 s, 1 E4 s, 1 E5 s, 1 e13 s, 1E-26 s, 1E19 s, 1E19 s and more, 1e-43 s, 1e12 s, 1e13 s, 1e14 s, 1e15 s, 1e16 s, 1e17 s, 1e21 s, 1e3 s, 1e38 s, 1e39 s, 1e4 s, 1e5 s, Exasecond, Exasecond and longer, Kilosecond, Petasecond, Terasecond, Terasecond and longer, Time (Orders of magnitude), Times of other orders of magnitude, Yactosecond, Yoctosecond, Yottasecond, Zeptosecond, Zettasecond.