Association of British Scrabble Players

Astronomy


achondrite a stony meteorite without rounded grains.
achondritic of or like an ACHONDRITE.
acronic acronical acronycal acronychal occurring at nightfall or sunset, (esp. of the rising or setting of stars.
albedo the fraction of light reflected from a body or surface > ALBEDOS or (US) ALBEDOES.
almacantar almucantar a circle of altitude, parallel to the horizon.
almagest a textbook or handbook, especially dealing with astronomy.
analemma the figure-8 on a map showing the sun's seasonal course > ANALEMMAS or ANALEMMATA.
ansa part of Saturn's rings > ANSAE.
antipodal situated at the opposite side of the earth or moon; diametrically opposed; (noun) an antipodal cell > ANTIPODALS.
antisolar opposite to the sun; -- said of the point in the heavens 180° distant from the sun.
aphelian relating to an APHELION, the point when the earth is farthest from the sun during its annual orbit.
aphelion the point when the earth is farthest from the sun during its annual orbit > APHELIA or APHELIONS. [Gk. apo, from + helios, sun].
apoapsis the high point in an orbit > APOAPSIDES.
apogaeic apogeal apogean apogeic relating to an APOGEE.
apogee the outermost point in an orbit; the highest point; the apex > APOGEES.
apolune the point in the orbit of a body revolving round the moon that is farthest from the centre of the moon.
appulse the close approach of a planet or asteroid to a star without the occurrence of an eclipse.
appulsive relating to an APPULSE, the close approach of a planet or asteroid to a star without the occurrence of an eclipse > APPULSIVELY.
apsis the point at which a heavenly body is most or least distant from centre of attraction > APSIDES.
areography description of the physical features of the planet Mars.
areology the study of Mars. [From Ares, the Greek equivalent of Mars in classical mythology) + logy (study)].
asterism a constellation of stars; a group of asterisks; appearance of star-like reflection by certain crystals.
asteroid a type of celestial body.
asteroidal of or pertaining to an ASTEROID.
astrobleme the wound left by a meteorite strike.
astrohatch a domed window in an aircraft for astronomical observations.
astronaut a person engaged in space travel.
astronomer a person who is skilled in astronomy or who makes observations of celestial phenomena.
astronomic astronomical related to ASTRONOMY.
astronomise astronomize to study astronomy.
astronomy the study of the celestial bodies and the heavens in all scientific aspects.
azimuth the angle a celestial object makes from due north, when measured in an eastwards direction along the horizon. [Arabic al-sumut, from al, the + samt, way].
azimuthal of or pertaining to the AZIMUTH > AZIMUTHALLY.
blazar a type of active galaxy that is a more energetic source of radiation than a quasar. Cf. REDSHIFT.
blueshift a shift of the spectrum towards the blue. Cf. REDSHIFT.
blueshifted having its light shifted towards the blue.
bolide a large meteor that bursts; a fireball.
canicular pertaining to the dog star, or the dog days of summer.
cepheid a star of a type having regular cycles of brightness which can be used to deduce their distances (aka 'standard candle').
chevelure the nebulous part of a comet.
chondrite a meteoric stone characterized by the presence of CHONDRULES.
circumlunar situated or moving round the moon.
circumsolar situated or moving round the sun.
cislunar on this side of the moon, i.e. between moon and earth.
coelostat an astronomical instrument used to reflect light on to a telescope.
collapsar a star that has collapsed under its own gravity to form a black hole.
collimator a telescope arranged and used to determine errors of collimation, both vertical and horizontal.
colure a celestial circle that intersects another at the poles. [Gr. kolouros, from kolos, docked + oura, tail].
coma a spherical cloud of material surrounding the head of a comet > COMAE or COMAS.
comal relating to a COMA.
comet a heavenly body with a (usu) elliptical orbit round the sun, having a main nucleus composed of rocky fragments held together with ice and surrounded by a cloud of dust and gas.
cometary cometic relating to a COMET.
cometology the study of comets.
corona one of the sun's envelopes, outside the chromosphere, observable during total eclipse > CORONAS or CORONAE.
cosmic cosmical of or pertaining to the universe as an ordered system or totality > COSMICALLY.
cosmologic cosmological relating to cosmology.
cosmology the study of the COSMOS.
cosmos kosmos the world or universe > COSMOSES, KOSMOSES. [Gk. kosmos].
coude (of a reflecting telescope) in which one or more plane mirrors reflects the light down the polar axis. (The e has an accent).
dayside the side of a planet facing the sun.
daystar the planet Venus.
deorbit to come out of an orbit.
diskless having no disk; appearing as a point and not expanded into a disk, as the image of a faint star in a telescope.
earthlight the faint light visible on parts of the moon not illuminated by the sun.
earthlike like the planet earth.
earthrise the rising of the earth as seen from the moon.
earthset the setting of the earth as seen from the moon.
earthshine the faint light visible on parts of the moon not illuminated by the sun.
eclipse the total or partial disappearance of a heavenly body by the interposition of another between it and the spectator; (verb) to obscure.
ecliptic an imaginary circle which the sun follows from Earth perspective > ECLIPTICALLY.
emersion the act of emerging esp. the reappearance of a heavenly body after eclipse or occultation.
ephemeris a table giving the positions of celestial bodies at different times > EPHEMERIDES.
ephemerist one who studies the daily motions and positions of the planets.
equant a term in Ptolemy's astronomical system. [L. aequare, to make equal].
evection a lunar inequality, the combined effect of the irregularity of the point of the moon's orbit at which it is nearest to Earth and the alternate increase and decrease of the eccentricity of the moon's orbit.
evectional relating to EVECTION.
exoplanet a planet that orbits a star in another solar system.
extrasolar beyond the solar system.
facula an unusually bright spot on the sun's surface > FACULAE.
facular of or pertaining to FACULAE.
fireball a burning meteor, a BOLIDE.
galaxy a star system.
geoprobe a space probe for exploring space near the earth.
geostationary of or pertaining to a satellite that travels about the earth's equator at an altitude of at least 35,000 kilometers at a speed matching that of the earth's rotation, thus maintaining a constant relation to points on the earth.
gibbose gibbous of a moon, between half and full.
gibbosity the state of being GIBBOSE.
heliac heliacal solar; coincident with that of the sun, or as nearly as could be observed > HELIACALLY.
heliology the science of the sun.
helioscope an instrument for observing sun without injury to the eyes.
hypernova an exploding star than produces even more energy and light than a SUPERNOVA > HYPERNOVAE or HYPERNOVAS.
inerrant unerring, fixed (of a star).
intergalactic situated in or relating to the spaces between galaxies.
interlunar interlunary relating to the period of the moon's invisibility.
kosmos see COSMOS.
loadstar lodestar the pole-star; one that serves as an inspiration, model or guide.
lunanaut lunarnaut one who travels to the moon.
lunar relating to the moon; (noun) a lunar distance > LUNARS.
lunet a little moon or satellite.
lunisolar relating jointly to the moon and sun.
lunitidal pertaining to tidal movements dependent on the moon.
magnetar a type of neutron star that has a very intense magnetic field.
mare a sea on the moon > MARIA.
marsquake a seismic disturbance on Mars.
mascon a concentration of dense mass beneath the moon's surface.
metagalaxy the whole universe considered as a system of galaxies.
metagalactic relating to a METAGALAXY.
meteor a small celestial body that enters the earth's atmosphere.
meteoroid a meteor that has not reached the earth's atmosphere.
meteorous of the nature or appearance of a meteor.
micrometeorite a very small meteorite.
micrometeoroid a very small meteoroid.
moon the satellite of a planet; (verb) to spend time idly > MOONS, MOONED, MOONING.
moonless lacking the light of the moon.
moonlet a small moon.
moonlike resembling the moon.
moonphase a phase of the moon.
moonquake a seismic disturbance on the moon.
moonscape a view of the moon's surface.
moonset the setting of the moon.
multiverse the sum of all universes.
nadir the point of the heavens diametrically opposite to the zenith; the point directly below an observer. [Arabic nazir, opposite to].
nadiral of or like a NADIR.
nebula a hazy or indistinct luminous area in the night sky representing a distant cluster of stars > NEBULAE or NEBULAS.
nebular of or like a NEBULA.
nebulose like a NEBULA, cloudy.
nebulous like a NEBULA, cloudy > NEBULOUSLY.
nodical of or pertaining to the nodes, as, the nodical revolutions of the moon.
nonsolar not related to the sun.
nova an exploding star > NOVAE or NOVAS.
novalike like a NOVA.
orbit to move or revolve around > ORBITS, ORBITING, ORBITED.
orbital relating to an orbit > ORBITALLY; (noun) an orbit > ORBITALS.
orrery an apparatus showing the relative positions and motions of bodies in the solar system by balls moved by wheelwork > ORRERIES. [From Charles Boyle, 4th Earl of Orrery (1676-1731), who was given such a models by John Rowley, a London instrument-maker]
parallax the seeming change of an object's position due to the observer moving.
paraselene a mock moon; bright patch on a lunar halo > PARASELENAE.
paraselenic relating to the PARASELENE.
periapsis the closest point to a central body reached by a body in orbit > PERIAPSES.
periastron that point, in the real or apparent orbit of one star revolving around another, at which the former is nearest to the latter > PERIASTRONS.
pericenter pericentre the point in the path of a body revolving round a centre at which it is nearest to the centre.
perigeal perigean relating to a PERIGEE.
perigee the point of the moon's orbit at which it is nearest the earth. [Gk. perigeion neuter of perigeios round or near the earth, from peri and ge earth]. Cf. APOGEE.
perihelial relating to the PERIHELION.
perihelion the point of the orbit of a planet or a comet at which it is nearest to the sun, as opposed to APHELION > PERIHELIA.
perilune the point in the path of a body orbiting the moon that is nearest to the centre of the moon.
planet any of the celestial bodies (including the earth, but other than a comet or meteor) that revolve about the sun reflecting the sun's light.
planetary of or pertaining to the planets; (noun) a train of planetary gears.
planetesimal an asteroid or similar tiny celestial body.
planetic relating to a PLANET.
planetical of or pertaining to planets.
planetoid a body resembling a planet; an asteroid.
planetology study of planets.
plenilunar of or relating to the full moon.
plerion a supernova remnant emitting radiation from both centre and shell.
polestar the first-magnitude star Ursae Minoris, now within one degree of the north celestial pole.
protogalaxy a galaxy in its initial state of formation.
protoplanet a planet in its initial state of formation.
protostar a condensing mass of gas in the early formation of a star.
pulsar a cosmic source of regular and rapid pulses of radiation usu. at radio frequencies, believed to be a rapidly rotating neutron star.
quasar a celestial object that resembles a star optically but is inferred to be an extremely remote and immensely powerful source of light and other radiation.
redshift the displacement of the light a receding object emits toward the red end of the spectrum. Cf. BLUESHIFT.
redshifted having its light shifted towards the red.
rille one of certain narrow, crooked valleys seen, by aid of the telescope, on the surface of the moon.
satelles a satellite > SATELLITES.
satellite a body revolving around a planet; (verb) to transmit by satellite > SATELLITES, SATELLITING, SATELLITED.
selenian lunar.
selenic of or relating to the moon. [Gk. selene, moon].
selenocentric pertaining to moon's centre; having moon as centre.
selenography the branch of astronomy dealing with the physical features of the moon.
selenology study of the moon.
semilune a half-moon shape.
semilunar semilunate having the shape of a SEMILUNE.
shergottite a type of meterorite, composed of solidified lava from celestial bodies other than earth.
sidereal of or relating to the stars; measured by apparent motion of the stars > SIDEREALLY.
siderolite a meteorite made up partly of stone, partly of iron.
singularity a point in space-time at which gravitational forces cause matter to have infinite density and infinitesimal volume, and space and time to become infinitely distorted.
skylab an orbiting experimental space station.
solar related to the sun; (noun) an upper room, a garret.
solunar relating to sun and moon.
spinar a rapidly spinning galactic body.
sputnik an orbiting spacecraft.
stardrift a common proper motion of a number of stars in the same region.
stardust cosmic dust, meteoric matter in fine particles.
stargaze to observe stars.
starshine the light of stars.
starspot an area of relative darkness on the surface of a star.
stellar relating to stars.
subdwarf a star smaller than a dwarf star.
sublunar sublunary under the moon, terrestrial.
subsolar directly under the sun, as a point on the earth's surface where the sun is vertically overhead.
sun the star that is the source of light; (verb) to expose to the sun's rays.
sunlike like or resembling the sun.
sunspot a dark spot on the surface of the sun.
sunspotted showing SUNSPOTS.
supergiant a very bright star of enormous size and low density, such as Antares.
superlunar superlunary above the moon, not of this world.
supernova a very brilliant nova resulting from an explosion which blows the star's material into space, leaving an expanding cloud of gas > SUPERNOVAE or SUPERNOVAS.
swingby the passing of a spacecraft near a planet to use its gravitational pull > SWINGBYS.
syzygal syzygial related to a SYZYGY.
syzygetic relating to a SYZYGY, conjunction or opposition.
syzygy a conjunction or opposition. [Gk. syzygia union, coupling].
teinoscope a prism telescope.
terraform to make (another planet) earth-like.
thindown a lessening in the number of atomic particles and cosmic rays passing through the earth's atmosphere.
transit the apparent passage of a smaller planet, etc over the disc of a greater; (verb) to pass across or through (something); to traverse > TRANSITS, TRANSITING, TRANSITED.
translunar translunary of or relating to the region beyond the moon's orbit.
triones the seven stars of the Plough. [L. triones plough-oxen]. N.B. no TRIONE*.
universe the totality of all existing things.
uranography descriptive astronomy and mapping.
uranology the study of the heavens; astronomy.
ursid a meteor.
zenith the highest point.
zenithal of or pertaining to the ZENITH.



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