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Astronomy
The scientific study of celestial objects and phenomena.
Star
A large, glowing ball of gas that generates heat and light through nuclear fusion.
Galaxy
A great island of stars in space, all held together by gravity and orbiting a common center.
Solar System
A star and all the material that orbits it, including its planets and moons.
Planet
A moderately large object that orbits a star, which may be rocky, icy, or gaseous.
Light Year
The distance that light can travel in one year.
Constellation
A region of the sky; there are 88 official constellations.
Zodiac
The 12 constellations in the plane of Earth's orbit.
Right Ascension
A celestial coordinate similar to longitude, measuring a star's position west to east.
Declination
A celestial coordinate similar to latitude, measuring a star's position south to north.
Celestial Sphere
An imaginary sphere where stars at different distances appear to lie.
Zenith
The point directly overhead in the sky.
Horizon
The "ground" level, 90 degrees from the zenith in all directions.
Gravitational Waves
Ripples in spacetime caused by mergers of black hole pairs.
Stellar Remnants
The remnants of stars after they die, including white dwarfs, neutron stars, and black holes.
Scientific Notation
A method of expressing large numbers using powers of ten.
Dark Energy
Comprises 75% of the Universe's composition.
Dark Matter
Comprises 21% of the Universe's composition.
Normal Matter
Comprises 4% of the Universe's composition.
Precession
The gradual shift in the orientation of Earth's axis over time.
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