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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.

Contributors in Astronomy

Astronomy

astrophysics

Physics; Astronomy

Study of the physical properties of objects in space.

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).

milky way

Physics; Astronomy

The specific galaxy to which the Sun belongs, so named because many of its stars appear as a milky band of light extending across the sky overhead, on a clear, dark night. The Milky Way is a spiral ...

ngc

Physics; Astronomy

These letters, when followed by numbers, refer to specific entries in The New General Catalogue of Nebulae and Clusters of Stars, which was compiled by John L.E. Dreyer in the nineteenth century. ...

red stars

Physics; Astronomy

Stars with low temperatures. Hydrogen-burning red stars are small and use their available fuel slowly. These low-mass stars last for tens to hundreds of billions of years — much longer than ...

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.

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