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Below is a list of useful Astronomy words. These big words were created by scientists to explain what happens in Outer Space. It is useful to know these words, but you don't have to memorize them all in one big chunk. That would ruin all the fun. Rather learn these Astronomy words one by one as you explore, and learn about our Universe. If you see a word you do not know come here look it up, and hopefully it will stay in you memory.

Absolute magnitude
How bright a star would look if it were 32.6 light years away from the Earth.

Absolute zero
The lowest possible temperature -273.16 degrees C.

Acceleration
Change in velocity (speed, or direction).

Airglow
The natural glow of the night sky due to reactions that take place in the Earths upper atmosphere.

Albedo
The albedo of an object is how much light it reflects, a perfect reflector such as a mirror would have an albedo of 100, the moon has an albedo of 7, and the Earth has an albedo of 36.

Angstrom unit
Unit used to measure the wavelength of light, and other electromagnetic radiation.

Apastron
When two stars that orbit each other are as far away from each other as they can get.

Aphelion
The point in an objects orbit around the Sun when it is furthest from the Sun.

Apogee
The point in an objects orbit around the earth when it is furthest from the Earth.

Aerolite
A meteorite which is stoney.

Asteroid
A rock, or Minor Planet orbiting the Sun.

Astrology
A belief that links the positions of the stars and planets to human destinies. It has no scientific background.

Astronomical Unit
The distance from the Earth to the Sun. Usually written AU.

Astrophysics
The use of physics and chemistry in the study of Astronomy.

Atmosphere
The gaseous area surrounding a planet or other body.

Atom
The smallest particle of any element.

Aurora
beautiful lights seen over the polar regions which are caused when energized particles from the Sun react with the Earths magnetic field.

Axis
An imaginary straight line on which an object rotates.

Background radiation
Weak microwave radiation coming from space in all directions. It is believed to be the remnant of the Big Bang.

Barycentre
The center of gravity of the Earth, and moon.

Binary star
A star which is actually made up of two stars orbiting each other.

Black Hole
A region of space around a very small and extremely massive object within which the gravitational field is so strong that not even light can escape.

Bolide
A brilliant meteor, which may explode during its descent through the Earth's atmosphere.

Bolometer
A sensitive radiation detector.

Celestial sphere
An imaginary sphere surrounding the Earth. It is used to help astronomers explain where objects a found in the sky.

Cepheid
A variable star that scientists can use to determine how distant a galaxy, or star cluster is.

Charge-Coupled Device (CCD)
A sensitive imaging device which is replacing photography in most branches of Astronomy.

Chromosphere
Part of the Sun's atmosphere, it is visible during a total solar eclipse.

Circumpolar star
A star which never sets, but can be viewed year round.

Clusters
A group or stars, or galaxies which are held together by their common gravity.

Color index
A measure of a star's color, which tells scientists how hot the stars surface is.

Coma
The hazy-looking patch surrounding the nucleus of a comet.

Comet
A small, frozen mass of dust and gas revolving around the sun.

Conjunction
When a planet appears to come close to another planet, or star. It only appears to come close because it moves in between the other object, and the Earth.

Constellation
A grouping of stars which have been given names by ancient astronomers because of the way they look.

Corona
The outermost part of the Sun's atmosphere.

Coronagraph
A type of telescope designed to view the Sun's Corona.

Cosmic rays
High-speed particles that reach the Earth from Outer Space.

Cosmology
The study of the universe.

Day
Amount of time it takes the Earth to spin once on its axis.

Density
The compactness of matter.

Direct motion
Objects moving around the Sun in the same direction as the Earth are moving in direct motion, objects moving in the opposite direction are moving in retrograde motion.

Diurnal motion
The apparent motion of the sky from East to West caused by the Earth moving from West to East.

Earthshine
The faint glow of the moon when the side facing Earth is dark. Caused by light reflecting off the Earth.

Eclipse
When our view of one object in the sky is blocked by either another object, or the Earths shadow.

Ecliptic
The path the Sun, Moon, and planets all follow in the sky.

Ecosphere
The area around a star where it is just the right temperature for life to exist.

Electron
Negative particle which orbits an atom.

Element
Substance which cannot be broken down any further. there are 92 known elements.

Equinox
March 21st, and September 22nd. Twice a year, when the day and night are the same amount of time all around the world.

Escape velocity
The speed an object must have in order to escape from another objects gravity.

Exosphere
The outermost part of the Earth's atmosphere.

Flares

(Solar Flares)
Beautiful eruptions in the outer part of the Sun's atmosphere.

Galaxy
A group of stars, gas and dust held together by gravity.

Gamma ray
Extremely short-wavelength, and energetic electromagnetic radiation.

Geocentric
Simply means the Earth in the Center. People used to believe the Universe was geocentric, or that the Earth was in the center of the Universe.

Geophysics
Study of the Earth using Physics.

Gibbous
When the Moon is more than half full, but less than completely full.

HI region
Cloud of neutral hydrogen.

HII region
Cloud of ionized hydrogen.

Hertzspurng-Russell Diagram
A diagram which helps scientists understand different kinds of stars. click here to learn more.

Hubble Constant
The relationship between the distance of an object, and the speed at which it is traveling away from us. The further away an object is the faster away from us it is traveling.