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Astronomy
Of or pertaining to the study of celestial objects. This includes the physics, chemistry, and evolution of moons, planets, stars, galaxies, and any phenomena that takes place outside the atmosphere of Earth.
Industry: Physics
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Astronomy
irregular galaxy
Physics; Astronomy
A galaxy whose shape is neither elliptical nor spiral. It is often rich in interstellar matter (gas and dust).
light-year
Physics; Astronomy
The distance traveled by light in a full year, equal to some 10 trillion kilometers (or about 6 trillion miles).
spiral arms
Physics; Astronomy
Curved, pinwheel-like structures in the disk of a spiral galaxy. The spiral arms contain blue stars and luminous newborn stars that make their spiral pattern visible.