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Small particles between planets
The interplanetary dust cloud, or zodiacal cloud (as the source of the zodiacal light), consists of cosmic dust (small particles floating in outer space)
Interplanetary_dust_cloud
Concentrations of dust in the Earth–Moon system
the clouds from the Tatra Mountains in what was then Czechoslovakia. Dust particles in the clouds likely come from the interplanetary dust cloud as they
Kordylewski_cloud
Faint solar glow caused by interplanetary dust at sunset and sunrise
or light pollution. The interplanetary dust in the Solar System forms a thick, pancake-shaped cloud called the zodiacal cloud which straddles the ecliptic
Zodiacal_light
Dust floating in space
dust can be further distinguished by its astronomical location: intergalactic dust, interstellar dust, interplanetary dust (as in the zodiacal cloud)
Cosmic_dust
Material which fills the Solar System
the Aurora, 2002) Interplanetary dust cloud Interplanetary magnetic field Interstellar space Interstellar medium Interstellar dust Intergalactic space
Interplanetary_medium
Space dust measurement refers to the study of small particles of extraterrestrial material, known as micrometeoroids or interplanetary dust particles
Space_dust_measurement
Large, round non-stellar astronomical object
formation is the nebular hypothesis, which posits that an interstellar cloud collapses out of a nebula to create a young protostar orbited by a protoplanetary
Planet
Innermost Galilean moon of Jupiter
chloride dust. These materials originate from Io's volcanic activity, with the material that escapes to Jupiter's magnetic field and into interplanetary space
Io_(moon)
Void between celestial bodies
termed the interplanetary medium. A cloud of interplanetary dust is visible at night as a faint band called the zodiacal light. Interplanetary space contains
Outer_space
Optical effect of interplanetary dust reflections
centered at the antisolar point. The backscatter of sunlight by interplanetary dust causes this optical phenomenon, being a zodiacal light and part of
Gegenschein
Accumulation of gas, plasma, and dust in space
An interstellar cloud is an accumulation of gas, plasma, and cosmic dust in galaxies. Put differently, an interstellar cloud is a denser-than-average region
Interstellar_cloud
Planetary system consisting of the Sun and objects orbiting it
bodies, such as asteroids, comets, centaurs, meteoroids, and interplanetary dust clouds. The dwarf planet Ceres and many of these smaller bodies are located
Solar_System
Dust instruments on the Galileo and Ulysses missions
detectors of sub-micron and micron sized dust particles. With these instruments the interplanetary dust cloud was characterized between Venus’ and Jupiter's
Galileo and Ulysses Dust Detectors
Galileo_and_Ulysses_Dust_Detectors
Overview of and topical guide to the Solar System
Centaurs Ubiquitous Comets ☄ Meteoroids Micrometeoroids Cosmic dust Interplanetary dust cloud Trans-Neptunian region Trans-Neptunian objects Kuiper belt Pluto
Outline_of_the_Solar_System
Scientific instrument on Cassini spacecraft
route to Saturn, the CDA analysed the interplanetary dust cloud, the stream of interstellar dust, and Jupiter dust streams. During 13 years in orbit around
Cosmic_Dust_Analyzer
Extraterrestrial view of outer space
interplanetary dust cloud in the Solar System. Analysis of images of impact debris from the Juno spacecraft shows that the distribution of the dust extends
Extraterrestrial_sky
Random fluctuations in radio waves of celestial origin
active galactic nuclei. Interplanetary space Interplanetary medium Interplanetary dust Interplanetary dust cloud Interplanetary magnetic field Interstellar
Interplanetary_scintillation
Zodiacal light instrument measured the brightness of light scattered by interplanetary dust along the line of sight. The in situ Micrometeoroid analyzer recorded
Helios_Dust_Instrumentation
Meteoroid with a mass of less than one gram
formation of the Solar System, consisting of particles from the interplanetary dust cloud or other objects made up from this material, like comets. The
Micrometeoroid
Planets visible to the naked eye
Gravitational collapse Hills cloud Hill sphere Interplanetary dust cloud Interplanetary medium/space Interstellar cloud Interstellar medium Interstellar
Classical_planet
Natural objects that originated in outer space
dust collected on Earth, in the Earth's stratosphere, and in low Earth orbit which likely include particles from the present day interplanetary dust cloud
Extraterrestrial_materials
Type of interstellar cloud
observations of some other galaxies. Within molecular clouds are regions with higher density, where much dust and many gas cores reside, called clumps. These
Molecular_cloud
Planetary object disrupted by other body
depths (and shapes) may differ, with g'-band being more sensitive to dust cloud scattering due to its shorter wavelength (0.47 vs. 0.62 micron). For a
Disrupted_planet
Interstellar cloud in the Milky Way Galaxy
Very Local Interstellar Medium which begins where the heliosphere and interplanetary medium end, the furthest that probes have traveled. The Solar System
Local_Interstellar_Cloud
Branch of astronomy
in an isotropic flux. Models of the interplanetary dust cloud require that the lifetimes of interplanetary dust particles are longer than those for rock
Dust_astronomy
Small particles between exoplanets
by collisions among bigger parent bodies like asteroids. Exozodiacal dust clouds are often components of debris disks that are detected around main-sequence
Exozodiacal_dust
Accumulation of matter around a star
source of interplanetary dust. Edgeworth-Kuiper belt, beyond the orbit of Neptune Scattered disc, beyond the orbit of Neptune Hills cloud; only the inner
Circumstellar_disc
Sand- to boulder-sized particle of debris in the Solar System
originating as meteorites Impact crater Impact event Interplanetary dust cloud § Collecting interplanetary dust on Earth Meteorite Micrometeorite Tektite "meteoroid"
Meteoroid
the Solar System, see meteoroid, micrometeoroid, cosmic dust, and interplanetary dust cloud. (See also Visited/imaged bodies.) List of gravitationally
List of Solar System objects by size
List_of_Solar_System_objects_by_size
Dense obscuring band of interstellar dust
molecular cloud (DMC) behavior. Extinction (astronomy) Interplanetary medium Intergalactic dust Interplanetary dust Interstellar dust Molecular Clouds Star
Dust_lane
reflected by an interplanetary dust cloud. It is concentrated near the plane of the zodiac, or ecliptic, particularly toward the Sun. The dust is mostly the
Glossary_of_astronomy
formation is the nebular hypothesis, which posits that an interstellar cloud collapses out of a nebula to create a young protostar orbited by a protoplanetary
Lists_of_planets
Natural physical entity in space
and an object: It is a body in reference to the frozen nucleus of ice and dust, and an object in reference to the entire comet with its diffuse coma and
Astronomical_object
Second planet from the Sun
orbital space of Venus has a dust ring-cloud, with a suspected origin either from Venus–trailing asteroids, interplanetary dust migrating in waves, or the
Venus
planets also have rings, consisting of a multitude of tiny solid objects and dust. The planets are, in order of distance from the Sun: Mercury, Venus, Earth
Historical models of the Solar System
Historical_models_of_the_Solar_System
Accumulation of matter around a planet
millimetre and submillimetre wavelengths, are better at observing dust concentrated in interplanetary regions, since stars emit comparatively little light at these
Circumplanetary_disk
Colombian astrophysicist
Colombian astrophysicist whose research concerns the accretion of interplanetary dust clouds into protoplanetary disks as part of the formation of exoplanets
Paola_Pinilla
Mathematician, natural philosopher and astronomer (1664–1753)
explained the zodiacal light as sunlight scattered by an interplanetary dust cloud (the "zodiacal cloud") that straddles the ecliptic plane. Fatio then studied
Nicolas_Fatio_de_Duillier
Equilibrium points near two orbiting bodies
interplanetary dust and at least two asteroids, 2010 TK7 and 2020 XL5. The Earth–Moon L4 and L5 points contain concentrations of interplanetary dust,
Lagrange_point
of the Earth's atmosphere and its associated meteorological phenomena: clouds, rain, hail and snow; wind, storms and thunderstorms, tornadoes and
Timeline of Solar System astronomy
Timeline_of_Solar_System_astronomy
Solar system exploration program by NASA
Earth-trailing orbit to determine the composition of the local and interplanetary dust cloud. MANTIS (Main-belt Asteroid and NEO Tour with Imaging and Spectroscopy)
Discovery_Program
Circumbinary gas giant orbiting the Kepler-1647 star system
collapse Hills cloud Internal structure Interplanetary dust cloud Interplanetary medium Interplanetary space Interstellar cloud Interstellar dust Interstellar
Kepler-1647b
Extrasolar planet
collapse Hills cloud Internal structure Interplanetary dust cloud Interplanetary medium Interplanetary space Interstellar cloud Interstellar dust Interstellar
51_Eridani_b
Interstellar comet in 2025
outgasses and lifts up dust from the comet's surface to form its coma. Images taken by the Hubble Space Telescope and various interplanetary spacecraft suggest
3I/ATLAS
Planetary mass companion orbiting GU Piscium
Doradus moving group of ca. 30 main stars created from the same molecular cloud less than 100 million years ago, and the only one found among the 90 stars
GU_Piscium_b
Earth-size exoplanet orbiting Kepler-1649
collapse Hills cloud Internal structure Interplanetary dust cloud Interplanetary medium Interplanetary space Interstellar cloud Interstellar dust Interstellar
Kepler-1649c
Star in the constellation Cetus
collapse Hills cloud Internal structure Interplanetary dust cloud Interplanetary medium Interplanetary space Interstellar cloud Interstellar dust Interstellar
LHS_1140
Molecular cloud in the constellation Ursa Minor
interstellar space Interplanetary medium – interplanetary dust Interstellar medium – interstellar dust Intergalactic medium – Intergalactic dust Local Interstellar
Polaris_Flare
Set of non-stellar objects in orbit around a star
Interplanetary dust clouds have been studied in the Solar System and analogs are believed to be present in other planetary systems. Exozodiacal dust,
Planetary_system
Frigid super-Earth orbiting OGLE-2016-BLG-1195L
collapse Hills cloud Internal structure Interplanetary dust cloud Interplanetary medium Interplanetary space Interstellar cloud Interstellar dust Interstellar
OGLE-2016-BLG-1195Lb
Super-Earth ice exoplanet
collapse Hills cloud Internal structure Interplanetary dust cloud Interplanetary medium Interplanetary space Interstellar cloud Interstellar dust Interstellar
OGLE-2005-BLG-390Lb
Cosmic dust that originates from a comet
"Ch. Orbital evolution of interplanetary dust". In Grün E; Gustafson B; Dermott S; Fechtig H (eds.). Interplanetary Dust. SpringerVerlag. pp. 569–39
Comet_dust
Natural object in space that releases gas
Ishii, H. A.; et al. (2008). "Comparison of Comet 81P/Wild 2 Dust with Interplanetary Dust from Comets". Science. 319 (5862): 447–50. Bibcode:2008Sci.
Comet
GPHS-RTG, electrical and thermal heat source of New Horizons Interplanetary dust cloud Interplanetary medium, studied during Hibernation Mongoose-V, CPU in New
List_of_New_Horizons_topics
Region between the orbits of Mars and Jupiter
x. Love, S. G.; Brownlee, D. E. (1992). "The IRAS dust band contribution to the interplanetary dust complex – Evidence seen at 60 and 100 microns". Astronomical
Asteroid_belt
Very old dust in space
Circumstellar dust Cosmic dust Cosmochemistry Extraterrestrial diamonds Extraterrestrial materials Glossary of meteoritics Interplanetary dust cloud List of
Presolar_grains
List of near-parabolic comets Small objects, including: Meteoroids Interplanetary dust Helium focusing cone, around the Sun Human-made objects orbiting
List_of_Solar_System_objects
Gas layer surrounding Mars
about 230 km and gradually merges with interplanetary space. Under sufficiently strong wind (> 30 ms−1), dust particles can be mobilized and lifted from
Atmosphere_of_Mars
collapse Hills cloud Internal structure Interplanetary dust cloud Interplanetary medium Interplanetary space Interstellar cloud Interstellar dust Interstellar
List of exoplanet search projects
List_of_exoplanet_search_projects
Topics referred to by the same term
Council, a Sri Lanka local authority Kordylewski Dust Clouds, sparse clouds of trapped interplanetary dust at the L4 and L5 Lagrangian points of the Earth–Moon
KDC
Space Infrared vision Infrared window Interlock (engineering) Interplanetary dust cloud Intervalence charge transfer Ionic crystal Iris recognition J
Index_of_infrared_articles
Appearance of the sky in a clear night
the Sun rises and sets, and is caused by sunlight interacting with interplanetary dust. Gegenschein is a faint bright spot in the night sky centered at
Night_sky
Matter and radiation in the space between the star systems in a galaxy
of stars – are caused by absorption of background starlight by dust in molecular clouds within a few thousand light years from Earth. This effect decreases
Interstellar_medium
Exosolar object orbiting OGLE-2016-BLG-1190L
collapse Hills cloud Internal structure Interplanetary dust cloud Interplanetary medium Interplanetary space Interstellar cloud Interstellar dust Interstellar
OGLE-2016-BLG-1190Lb
astrophysics doctoral thesis was titled The thermal emission of interplanetary dust cloud models, published by the University of Colorado Boulder in 1968
Christopher_B._Kaiser
Interstellar absorption and scattering of light
PAH molecules. Investigations of interstellar grains embedded in interplanetary dust particles (IDP) observed this feature and identified the carrier
Extinction_(astronomy)
Cosmic dust in between galaxies in intergalactic space
dust can form intergalactic dust clouds, known since the 1960s to exist around some galaxies. By the 1980s, at least four intergalactic dust clouds had
Intergalactic_dust
Series of first-person shooter video games
series is set in the 24th century, showing the galactic war between the Interplanetary Strategic Alliance (ISA) and the Helghan Empire. The Killzone series
Killzone
Evaluation and mitigation system
elongated. Inhalation exposure to this dust can cause breathing difficulties because the dust is toxic. It can also cloud astronauts' visors when working on
Astronautical_hygiene
Star at the centre of the Solar System
bright sunlight suddenly appearing through a break between clouds). Hazy conditions, atmospheric dust, and high humidity contribute to this atmospheric attenuation
Sun
Discrepancy between past temperatures and the amount of incoming solar radiation
Farley, K.A. (13 July 1995). "Cenozoic variations in the flux of interplanetary dust recorded by 3He in a deep-sea sediment". Nature. 376 (6536): 153–156
100,000-year_problem
First successful mission to Venus (1962–1963)
confirming the measurements by Luna 1 in 1959. It also measured interplanetary dust, which turned out to be scarcer than predicted. In addition, Mariner
Mariner_2
Pressure exerted upon any surface exposed to electromagnetic radiation
regions of large clouds of dust and gases, giving rise to star clusters. Radiation pressure from the member stars eventually disperses the clouds, which can
Radiation_pressure
caused by interplanetary dust at sunset and sunrise Gegenschein – Optical effect of interplanetary dust reflections[1] Reflection nebula – Clouds of interstellar
List of reflected light sources
List_of_reflected_light_sources
Ring of cosmic dust orbiting an astronomical object
minor planets, such as the asteroid belt or Kuiper belt, or rings of interplanetary dust, such as around the Sun at distances of Mercury, Venus, and Earth
Ring_system
Experiment payload on the Space Shuttle Columbia
Goddard Team NASAN.gov, Sprites and Elve from MEIDEX NASA.gov, Interactions of mineral dust and sea salt with clouds; some results from the MEIDEX campaign
Freestar_experiment
American astronomer
collapse Hills cloud Internal structure Interplanetary dust cloud Interplanetary medium Interplanetary space Interstellar cloud Interstellar dust Interstellar
Sarah_Ballard
European orbiter mission to Mars (2003–present)
composition, and study of the interaction of the atmosphere with the interplanetary medium. Due to the valuable science return and the highly flexible mission
Mars_Express
Failed Mars mission
to globally monitor Mars over time to make studies of cloud movement, surface changes due to dust storms, and other long-term observations of the surface
Mars_96
been shown to have its own dust ring-cloud, with a suspected origin either from Venus trailing asteroids, interplanetary dust migrating in waves, or the
Orbit_of_Venus
NASA space program from 1962 to 1973
charged particles flowing outward from the Sun. It also measured interplanetary dust, which turned out to be more scarce than predicted. In addition,
Mariner_program
American astronomer
Gravitational collapse Hills cloud Hill sphere Interplanetary dust cloud Interplanetary medium/space Interstellar cloud Interstellar medium Interstellar
Craig_Chester_(astronomer)
NASA flyby mission to Venus (1967–1968)
Mariner 5 was able to shed new light on the hot, cloud-covered planet and on conditions in interplanetary space. Radio occultation data from Mariner 5 helped
Mariner_5
Hypothesis on the interstellar spreading of primordial life
Planetary protection – Prevention of interplanetary biological contamination Berera, Arjun (6 November 2017). "Space dust collisions as a planetary escape
Panspermia
Celestial event caused by streams of meteoroids entering Earth's atmosphere
Meteor Storm of 1833 led Denison Olmsted to show it arrived as a cloud of space dust, with the streaks forming a radiant point in the direction of the
Meteor_shower
1970s proposal for an interstellar probe
flight) was a study conducted between 1973 and 1978 by the British Interplanetary Society to design a plausible uncrewed interstellar probe. Intended
Project_Daedalus
Interplanetary introduction of species
such as the capture of interplanetary dust particles by planets and moons in the Solar System, where 10−5 of the Zodiacal cloud maintained by comet ablation
Directed_panspermia
Halo seen about the observer's shadow
spectre – Atmospheric optical phenomenon Gegenschein – Optical effect of interplanetary dust reflections Halo (optical phenomenon) – Optical phenomenon of the
Glory_(optical_phenomenon)
Neutral form of the hydroxide ion
molecules in the interstellar clouds and provide the possibility to study dense clouds, which are obscured by the dust they contain. The •HO molecule
Hydroxyl_radical
Scientific package that flew on Apollo 12 and Apollo 15
lunar night. The instrument was also able to distinguish plasma within interplanetary space and that found in the Earth's magnetosheath. Magnetosheath plasma
Solar_Wind_Spectrometer
Earth shield to reduce sunlight
"Space-Based Solar Shield To Offset Greenhouse Effect", Journal of the British Interplanetary Society, vol. 42, pp. 567–569, Bibcode:1989JBIS...42..567E. This proposal
Space_sunshade
Circumplanetary Dust: Observations and Simple Physics" (PDF). In Grun, E.; Gustafson, B. A. S.; Dermott, S. T.; Fechtig H. (eds.). Interplanetary Dust. Berlin:
Rings_of_Jupiter
NASA sample-return mission to Comet 81P/Wild 2 (1999–2011)
Its primary mission was to collect dust samples from the coma of comet Wild 2, as well as samples of cosmic dust, and return them to Earth for analysis
Stardust_(spacecraft)
New Horizons Pluto space probe instrument launched 2006
Bibcode:2008AGUFM.P31A1388J. "Measurements of the Interplanetary Dust Population by the Venetia Burney Student Dust Counter on the New Horizons Mission". Archived
Venetia Burney Student Dust Counter
Venetia_Burney_Student_Dust_Counter
Space probe that can travel out of the Solar System
List of nearest stars and brown dwarfs Local Interstellar Cloud and Local Bubble Interplanetary spaceflight Interstellar travel Intergalactic travel "Interstellar
Interstellar_probe
India's second Martian mission
explain the dust flux at Mars, whether there is any ring (as hypothesized) around Mars and also confirm whether the dust is interplanetary or coming from
Mars_Lander_Mission
Optical phenomenon
observer cast upon the upper surfaces of clouds opposite the Sun Gegenschein, the brightening of interplanetary dust (zodiacal light) visible in the night
Heiligenschein
Soviet orbiter and lander mission to Mars (1971–1972)
their available data resources in snapping images of the featureless dust clouds below, rather than the surface mapping intended. The Mars 2 orbiter sent
Mars_2
Soviet orbiter/lander mission to Mars (1971–1972)
their available data resources in snapping images of the featureless dust clouds. The Mars 3 orbiter sent back data covering the period from December
Mars_3
Formation processes of the planet Jupiter
most of the gas in its orbital region, creating a gap in the dense interplanetary medium of the protoplanetary disk. The regular satellites are thought
Formation_of_Jupiter
INTERPLANETARY DUST-CLOUD
INTERPLANETARY DUST-CLOUD
Surname or Lastname
English
English : nickname from Middle English dut ‘joy’, ‘delight’.Indian : variant of Datta.German : from the Germanic personal name Dudo (see Due).
Girl/Female
English American
Nickname.
Boy/Male
Indian
Friend
Girl/Female
Hindu
Dust
Surname or Lastname
English
English : from Old English dūst ‘dust’, applied as a nickname, possibly for someone with a dusty complexion or hair (as, for example, a miller), or for a worthless person.North German : possibly a Westphalian habitational name from a farm named with dost ‘bush’, ‘brush’. However, the word also means ‘fine dust’, ‘flour’ and may have been applied as an occupational nickname for a miller. Compare 1.
Boy/Male
Czech
Spirit.
Boy/Male
English
Dusty Place; Diminutive of Dustin
Boy/Male
English American
Dusty place; brave soldier.
Biblical
dust
Girl/Female
Tamil
Kashmalam | கஷà¯à®®à®¾à®‚லம
Dust
Kashmalam | கஷà¯à®®à®¾à®‚லம
Boy/Male
Indian, Tamil
Dust
Surname or Lastname
Swiss German
Swiss German : topographic name for someone who lived by a prominent elm tree, Rust (Old High German ruost), or in northern Germany for someone who lived by a resting place or halt along a route, from Middle Low German ruste ‘rest’.English (chiefly East Anglia) and Scottish : nickname for someone with red hair or a ruddy complexion, from Old English rūst ‘rust’ (from a Germanic root meaning ‘red’).
Boy/Male
English
Dusty place; brave soldier.
Boy/Male
Muslim
Friend
Surname or Lastname
English (Lincolnshire)
English (Lincolnshire) : unexplained. Black identified this as a Scottish name of Pictish origin. However, the modern distribution of the surname, almost exclusively in Lincolnshire and adjoining counties, suggests a more localized eastern English origin.
Boy/Male
French
Red haired.
Girl/Female
Dutch
Girl/Female
English
Nickname.
Male
English
Pet form of English Dustin, probably DUSTY means "Thor's stone."
Boy/Male
American, British, English, Latin
Just
INTERPLANETARY DUST-CLOUD
INTERPLANETARY DUST-CLOUD
Boy/Male
Teutonic
Excellent.
Female
Finnish
Finnish pet form of Latin Tatiana, probably TAINA means "father."
Boy/Male
Tamil
The great one
Boy/Male
Tamil
Surname or Lastname
English and German
English and German : from Middle Low German stump ‘tree stump’ (borrowed into Middle English), hence a topographic name for someone who lived by a conspicuous tree stump, or a nickname for a short, stout man.German (mainly northern and central) : variant of Stumm.
Boy/Male
Hindu
The legend
Female
Hindi/Indian
Variant spelling of Hindi Nitya, NITHYA means "always; eternally."
Boy/Male
Hindu
Female
Greek
(θάλασσα) Greek name THALASSA means "sea." In mythology, this is the name of a daughter of Aither (Latin Æther) and Hemera. She was a feminine personification of the Mediterranean Sea.
Girl/Female
Arabic, Hindu, Indian, Muslim
Name of River in Punjab
INTERPLANETARY DUST-CLOUD
INTERPLANETARY DUST-CLOUD
INTERPLANETARY DUST-CLOUD
INTERPLANETARY DUST-CLOUD
INTERPLANETARY DUST-CLOUD
superl.
Like dust; of the color of dust; as a dusty white.
n.
Gold dust
v. i.
To contract rust; to be or become oxidized.
superl.
Filled, covered, or sprinkled with dust; clouded with dust; as, a dusty table; also, reducing to dust.
a.
Between planets; as, interplanetary spaces.
v. i.
To grow dusk.
v. t.
To free from dust; to brush, wipe, or sweep away dust from; as, to dust a table or a floor.
v. t.
To sprinkle with dust.
n.
One who, or that which, dusts; a utensil that frees from dust.
a.
Not transgressing the requirement of truth and propriety; conformed to the truth of things, to reason, or to a proper standard; exact; normal; reasonable; regular; due; as, a just statement; a just inference.
n.
Fine, dry particles of earth or other matter, so comminuted that they may be raised and wafted by the wind; that which is crumbled too minute portions; fine powder; as, clouds of dust; bone dust.
v. i. / auxiliary
To be obliged; to be necessitated; -- expressing either physical or moral necessity; as, a man must eat for nourishment; we must submit to the laws.
n.
That which resembles rust in appearance or effects.
v. t.
To cause to contract rust; to corrode with rust; to affect with rust of any kind.
n.
Foul matter arising from degeneration; as, rust on salted meat.
n.
A composition used in making a rust joint. See Rust joint, below.
v. t.
To make dusk.
adv.
Barely; merely; scarcely; only; by a very small space or time; as, he just missed the train; just too late.
v. i. / auxiliary
To be morally required; to be necessary or essential to a certain quality, character, end, or result; as, he must reconsider the matter; he must have been insane.