More cool space words:
Apastron: the point where two binary stars are farthest apart.
Azimuth: distance of an object in angular.
Bolide: an especially bright meteor, especially one that explodes in the atmosphere (also called fireballs!).
Catena: a chain or series of craters.
Ejecta: material that is strewn about a crater by an impact, usually a meteorite or other similar object.
Ephemeris: a table that lists the positions of the sun, moon, and planets by date.
Heliosphere: the magnetic bubble of space that contains our solar system, solar wind, and the entire solar magnetic field. It is so large it goes beyond pluto's orbit.
Meridian: an imaginary circle that goes through the north and south poles, and the zenith and nadir of a location.
Nadir: the point in the sky directly underneath you.
Nova: when a dying star suddenly flares in brightness. The star becomes thousands of times its original luminosity.
Prominence: an explosion on the surface of the Sun.
Singularity: the impossibly small space in the center of a black hole where density and gravity are infinite, and space-time curves infinitely.
Spicules: a jet of gas ejected from the sun's atmosphere that resembles grass.
Supernova: one of the most powerful forces in the universe. When a star uses up all of its fuel it ends its life in a spectacular and devastating explosion.
Terminator: line on a planetary body that separates the light side from the dark side.
Umbra: the darkest part of a shadow.
Zenith: the point in the sky directly overhead.
Zodiac: an imaginary belt across the sky that the sun, moon, and planets are always in. The zodiac is made up of 12 constellations.
aphelion - the point in the orbit of a planet, asteroid, or comet at which it is farthest from the Sun. astral - relating to or resembling the stars. caldera - a large volcanic crater, especially one formed by a major eruption leading to the collapse of the mouth of the volcano. celestial - positioned in or relating to the sky, or outer space as observed in astronomy. constellation - a group of stars forming a recognizable pattern. cosmos - the universe seen as a well-ordered whole. equinox - the time or date at which the sun crosses the celestial equator, when day and night are of equal length. faculae - bright patches that are visible on the Sun’s surface. lunation - the interval of a complete lunar cycle, between one new Moon and the next. interstellar - occurring or situated between stars. nebula - a cloud of gas and dust in outer space, visible in the night sky either as an indistinct bright patch or as a dark silhouette against other luminous matter. perihelion - the point in the orbit of a planet, asteroid, or comet at which it is closest to the Sun. synodic - relating to or involving the conjunction of stars, planets, or other celestial objects.