519,064 articles
AstroMesh reflector
The AstroMesh reflector is a deployable mesh antenna reflector for spacecraft, developed by Astro Aerospace in the 1990s and flown on missions including Thuraya, Inmarsat 4, and SMAP.
Astrometric calibration
Astrometric calibration ties measured positions of astronomical sources to a standard celestial reference frame, producing World Coordinate System solutions for images and global solutions for Gaia.
Astrometry
Astrometry, also called astrometrics, is the oldest branch of astronomy: the measurement of celestial positions and motions, from Hipparchus' star catalog to ESA's Gaia mission.
Astromind (星尘智能)
Astromind (星尘智能), whose product brand is Astribot, is a Chinese embodied-AI startup founded in Shenzhen in 2022 by ex-Tencent engineers that builds tendon-driven dual-arm robots.
Astron (fusion experiment)
Astron was a magnetic-confinement fusion experiment proposed by Nicholas Christofilos and built at Lawrence Livermore's Lawrence Radiation Laboratory; completed in 1964, its relativistic-electron E-layer concept led to the field-reversed configuration.
Astronaut
An astronaut is a person trained and qualified to serve as a crew member aboard a spacecraft, with Russian crew members called cosmonauts and Chinese crew members taikonauts.
Astronaut (Duran Duran album)
Astronaut (2004) is Duran Duran's eleventh studio album and the first recorded by the original five-member lineup since Seven and the Ragged Tiger (1983), released on Epic Records with the UK top five single (Reach Up For The) Sunrise.
Astronaut in the Ocean
Astronaut in the Ocean is a 2019 trap single by Australian rapper Masked Wolf (Harry Michael), produced by Tyron Hapi; viral on TikTok, re-released 2021 on Elektra, reaching Billboard Hot 100 No. 6 and one billion streams.
Astronaut selection and candidate screening
Astronaut selection and candidate screening is the multi-stage process by which agencies such as NASA and ESA screen applicants on qualifications, medical fitness, and psychological suitability, selecting classes roughly every four years.
Astronaut training
Astronaut training is the multi-year program that turns selected astronaut candidates into people certified to fly in space, covering spacecraft systems, spacewalking, robotics, languages, and survival.
Astronergy (正泰新能)
Astronergy (正泰新能) is the photovoltaic cell and module manufacturer of China's Chint Group, based in Haining, Zhejiang, and among the first to mass-produce n-type TOPCon modules.
AstroNet
AstroNet is a deep convolutional neural network by Christopher Shallue and Andrew Vanderburg that classifies Kepler light-curve signals as planets or false positives, discovering Kepler-90i and Kepler-80g.
Astronium
Astronium Jacq. (Anacardiaceae) is a neotropical genus of about 12-13 hardwood tree species, type species A. graveolens, ranging from Mexico to northern Argentina; sources of tigerwood and gonçalo-alves timber.
Astronium urundeuva
Astronium urundeuva (allemão) Engl., aroeira or urunday, a South American Anacardiaceae timber tree; a synonym of Myracrodruon urundeuva, native to Brazil, Bolivia, Paraguay, and Argentina, IUCN Least Concern.
Astronomer
An astronomer is a scientist who studies celestial bodies such as planets, stars, and galaxies, investigating the universe's origin and evolution; about 7,000 work professionally in North America.
Astronomia Nova
Astronomia Nova is a treatise by Johannes Kepler published in Prague in 1609, formulating the first two laws of planetary motion, based on Tycho Brahe's observations of Mars.
Astronomica
The Astronomica is a Latin didactic poem in five books by Manilius, teaching astrology; the earliest surviving explicitly astrological work, dated to the early first century CE.
Astronomical chronology
Astronomical chronology, also known as astronomical dating, dates historical events by matching recorded eclipses with calculated positions of the Sun and Moon, fixing events like Babylon's fall in 539 BC.
Astronomical clock
An astronomical clock is a clock that also displays the positions of the Sun and Moon, the lunar phase, and calendrical data such as the date.
Astronomical Diaries
The Astronomical Diaries, also known as the Babylonian Astronomical Diaries, are Akkadian cuneiform records kept at Babylon from 652 BCE, recording celestial phenomena, prices, and events.
Astronomical naming conventions
Astronomical naming conventions, or astronomical nomenclature, are the rules by which stars, planets, minor planets, and comets receive designations and proper names, standardized since 1919 by the International Astronomical Union.
Astronomical object
An astronomical object, also called a celestial object, is a natural physical entity observed in outer space, such as a star, planet, moon, asteroid, comet, nebula, or galaxy.
Astronomical Observatories of Kazan Federal University
Serial World Heritage property (inscribed 2023, criteria ii and iv) of Kazan Federal University: the 1837 Kazan City Astronomical Observatory and the 1901 Engelhardt Astronomical Observatory 24 km west, holding the world's only functioning heliometer.
Astronomical seeing
Astronomical seeing, also called atmospheric seeing, is the blurring and distortion of star images by turbulence in Earth's atmosphere, the reason stars twinkle and blur in photographs.
Astronomical spectroscopy
Astronomical spectroscopy disperses the light of stars and galaxies into spectra, revealing chemical composition, temperature, and motion; it measures dark matter, stellar masses, and the Universe's expansion.
Astronomical symbols
Astronomical symbols are graphic signs, such as ☿ for Mercury, representing the Sun, Moon, and planets in astronomy and astrology. The International Astronomical Union discourages their use in scientific publications.
Astronomical unit
The astronomical unit (au) is a unit of length used in astronomy, defined since 2012 as exactly 149,597,870,700 meters, approximating the mean distance between the Sun and Earth.
Astronomy
Astronomy is the natural science that studies celestial objects, including stars, planets, and galaxies, through observation of their light; practiced since ancient Babylonia, it now includes astrophysics and cosmology.
Astronomy & Astrophysics
Astronomy & Astrophysics, also known as A&A, is an international peer-reviewed scientific journal publishing original research in astronomy and astrophysics since its first issue in January 1969.
Astronomy in Goryeo
Astronomy in Goryeo was the state-run practice of celestial observation, calendar computation, and timekeeping under Korea's Goryeo dynasty, 918–1392, whose Goryeosa records are still used today.