42,772 articles
IC 2165
IC 2165 is a carbon-rich planetary nebula in the constellation Canis Major, the glowing shell of gas expelled by a dying intermediate-mass star, discovered by Williamina Fleming in 1898.
IC 2391
IC 2391, also called the Omicron Velorum Cluster or Collinder 135, is a young open star cluster in the constellation Vela, about 150 parsecs from Earth.
IC 2602
IC 2602, also called the Southern Pleiades or Theta Carinae Cluster, is a bright young open star cluster in Carina, among the nearest to the Sun at about 480 light-years.
IC 342
IC 342, nicknamed the Hidden Galaxy, is a large, nearly face-on spiral galaxy in Camelopardalis, dimmed and reddened by dust in the Milky Way's plane.
IC 348
IC 348 is a young open cluster with reflection nebulosity in the Perseus molecular cloud, about 1,000 light-years away, with 495 members aged roughly 2 million years.
IC 3568
IC 3568, called the Lemon Slice Nebula, is a round planetary nebula in Camelopardalis about 9,000 light-years from Earth, the glowing shell shed by a dying sun-like star.
IC 418
IC 418, also known as the Spirograph Nebula, is a bright young planetary nebula in the constellation Lepus, formed from gas ejected by a dying Sun-like star.
IC 443
IC 443, also called the Jellyfish Nebula, is a supernova remnant in the constellation Gemini, about 5,000 light-years away, whose blast wave collides with nearby molecular clouds.
IC 4499
IC 4499 is a sparsely populated globular cluster of the Milky Way in the southern constellation Apus, discovered in 1900 and later found to be about 12 billion years old.
IC 4593
IC 4593, the White-Eyed Pea, is a planetary nebula in the constellation Hercules, a glowing gas shell cast off by a dying star about 7,800 light-years away.
IC 4651
IC 4651 is an intermediate-age open star cluster in the constellation Ara, about 3000 light-years from the Sun and roughly 1.7 billion years old, cataloged in 1896.
IC 4665
IC 4665, also cataloged as Collinder 349 and popularly called the Summer Beehive Cluster, is a large, loose open star cluster in the constellation Ophiuchus.
IC 4997
IC 4997, cataloged as PK 58−10.1 and the variable star QV Sge, is a young, compact planetary nebula in Sagitta whose emission-line spectrum varies episodically over roughly 50–60 years.
IC 5146
IC 5146, commonly called the Cocoon Nebula, is an emission and reflection nebula with young stars in the constellation Cygnus, about 4,000 light years away.
ICalendar
iCalendar, served as ICS files, is an IETF-standardized text format for exchanging events, to-dos, and scheduling information, used by essentially all major calendar products since 1998.
Icariin
Icariin is a prenylated flavonol glycoside, the main active constituent of Herba Epimedii from Epimedium in traditional Chinese medicine, and a weak PDE5 inhibitor studied for erectile function and bone health.
Icarus (journal)
Icarus, also known as the International Journal of Solar System Studies, is a peer-reviewed journal of Solar System research, first published by Academic Press in 1962.
ICARUS T600
The ICARUS T600 is a 760-ton liquid argon neutrino detector, the first large-scale of its kind, which ran at Gran Sasso from 2010 to 2013.
Icatibant
Icatibant, sold as Firazyr, is a synthetic decapeptide that blocks the bradykinin B2 receptor, used to treat acute attacks of hereditary angioedema by subcutaneous injection.
Ice
Ice is the solid form of water, formed by freezing liquid water or direct deposition of water vapor, and it floats on its own liquid.
Ice 0
Ice 0 is a metastable crystalline phase of water, proposed in 2014, through which deeply supercooled liquid water crystallizes into ordinary low-pressure ice instead of nucleating directly.
Ice accretion
Ice accretion is the growth of ice on a surface exposed to supercooled water, most prominently on aircraft, where it degrades wing aerodynamics and blocks sensors and engines.
Ice age
An ice age is a long interval of Earth history when continental ice sheets exist at least at the poles. Earth is currently in one, the Late Cenozoic Ice Age.
Ice core
An ice core is a cylindrical sample of ice drilled from a glacier or ice sheet, preserving trapped ancient air that records 800,000 years of climate history.
Ice core chronology
Ice core chronology is the dating framework assigning an age to every depth in a drilled ice core, built by layer counting, ice-flow models, and stratigraphy.
Ice cover dynamics
Ice cover dynamics is the study of the seasonal cycle of freezing, thickening, and thawing on lakes, summarized by ice phenology and used to track climate change.
Ice floe
An ice floe is a flat piece of sea ice 65 feet (20 m) or more across that floats freely, drifting with winds and currents in the polar pack.
Ice giant
An ice giant is a giant planet composed mainly of water, ammonia, and methane rather than hydrogen and helium; Uranus and Neptune are the Solar System's two members.
Ice Ih
Ice Ih is the hexagonal form of water that freezes at ambient pressure; it is virtually all natural snow, sea ice, glacier ice, and lake ice.
Ice lens
An ice lens is a layer of nearly pure ice that forms in freezing soil as water migrates to the freezing front, causing frost heave.