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Lunar eclipse
A lunar eclipse, or eclipse of the Moon, occurs when Earth passes between the Sun and a full Moon, so the Moon moves through Earth's shadow.
Lunar eclipses of the 16th–18th centuries
A catalog of the 738 lunar eclipses Earth experienced from 1501 to 1800, covering notable events, eclipse classification, and the scientific use of historical observations.
Lunar eclipses of the 20th century
Lunar eclipses of the 20th century: Earth experienced 229 lunar eclipses from 1901 to 2000, of which 81 were total, cataloged by astronomers Fred Espenak and Jean Meeus.
Lunar eclipses of the 21st century
The lunar eclipses of the 21st century, also listed as the list of 21st-century lunar eclipses, are the 228 eclipses occurring between 2001 and 2100, including 85 total eclipses.
Lunar eclipses of the 22nd century
The lunar eclipses of the 22nd century are the 238 eclipses predicted between January 2101 and December 2200, comprising 81 penumbral, 88 partial, and 69 total eclipses.
Lunar effect
The lunar effect is the claimed influence of the Moon's phases, especially the full moon, on human behavior and health; large-scale research has found no reliable connection.
Lunar laser ranging
Lunar laser ranging (LLR) is a geodetic technique that times laser pulses fired at retroreflector arrays on the Moon, measuring the Earth-Moon distance to millimeter precision since 1969.
Lunar lava tubes
Lunar lava tubes are empty conduits beneath the Moon's surface left when lava flows drained away; orbital evidence confirms intact examples exist, potentially far larger than any cave on Earth.
Lunar mare basalt
Lunar mare basalt is the dark volcanic rock that fills the Moon's low-lying maria, plains early astronomers mistook for seas, erupted mostly between 3.8 and 3.2 billion years ago.
Lunar month
A lunar month, also called a Moon month or lunation, is the time from one New Moon to the next, averaging 29.53 days and forming the basis of lunar calendars.
Lunar phase
A lunar phase, also called a moon phase, is one of the recurring apparent shapes of the Moon as seen from Earth, repeating every 29.5 days.
Lunar resources
Lunar resources, also called Moon mining targets, are materials on the Moon usable for space activity, including polar water ice, regolith oxygen and metals, and helium-3; none are yet extracted.
Lunar theory
Lunar theory is the mathematical description of the Moon's motion around the Earth under the gravitation of the Earth and the Sun, serving for three centuries as the principal testing ground for perturbation theory.
Lunar water
Lunar water, also called water on the Moon, is water on or beneath the Moon's surface, including ice in permanently shadowed polar craters, confirmed by spacecraft since the 1990s.
Luneburg lens
A Luneburg lens is a spherical lens whose refractive index is highest at its center, focusing waves from any direction without aberration, used in radar reflectors.
Lunisolar calendar
A lunisolar calendar has months following the Moon's phases and years kept aligned with the solar year by inserting extra months, as in the Hebrew and Chinese calendars.
Lupeol
Lupeol, also known as fagarasterol, is a naturally occurring pentacyclic triterpenoid found in lupin seeds, fig tree latex, and edible fruits and vegetables, studied for anticancer and anti-inflammatory activity despite poor bioavailability.
Luping Yu
Luping Yu is a chemist who spent his career as Professor of Chemistry at the University of Chicago until retiring in 2024, known for donor–acceptor semiconducting polymers for organic solar cells.
Lupus (constellation)
Lupus (Lup) is a southern constellation representing a wolf, one of Ptolemy's 48 constellations, lying between Centaurus and Scorpius; it contains the remnant of SN 1006, the brightest stellar event in recorded history.
Lupus Complex
The Lupus complex, also called the Lupus clouds, is a nearby group of dark molecular clouds forming low-mass stars in the constellation Lupus, about 150 parsecs away.
Lupus SN
Lupus SN is the SIMBAD database name for SN 1006, the remnant of the brilliant supernova of 1006, about 7,000 light-years away in the constellation Lupus.
Luqiao Liu
Luqiao Liu is a physicist and associate professor of electrical engineering at MIT who works on spintronics, known for a 2012 Science paper on the giant spin Hall effect of tantalum.
Lustre (mineralogy)
Lustre, also called mineral luster, is the way a mineral's fresh surface reflects light, described by terms such as metallic, vitreous, pearly, and adamantine, with vitreous the most common.
Lutetian
The Lutetian is the second of four Eocene stages, spanning about 47.8 to 41.2 million years ago and named after Lutetia, the Roman name for Paris.
Lutetium
Lutetium, also called cassiopeium, is a silvery-white metal, atomic number 71 and the heaviest lanthanide, discovered in 1907 and named after Lutetia, the Latin name for Paris.
Lutetium-177
Lutetium-177 (177Lu) is a reactor-produced radioactive isotope of the rare-earth metal lutetium, with a 6.647-day half-life, used in the approved cancer therapies Lutathera and Pluvicto.
Luther P. Eisenhart
Luther P. Eisenhart (1876–1965) was an American mathematician who spent his entire career at Princeton University, working in differential geometry and tensor analysis, and served as president of the American Mathematical Society.
Luttinger liquid
A Luttinger liquid, also called a Tomonaga–Luttinger liquid or TLL, is the low-energy description of interacting one-dimensional quantum fluids, where collective charge and spin waves replace quasiparticles.
Lutz Ackermann
Lutz Ackermann is a German chemist and professor at the University of Göttingen since 2007, known for C–H activation and electrocatalysis, and winner of the 2017 Leibniz Prize.
Lutz Greb
Lutz Greb is an inorganic chemist who has been Professor of Inorganic Chemistry at Heidelberg University since 2022, working on Lewis superacids and silicon chemistry.