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- Number of terms: 3726
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A unit for measuring acceleration, which is metre per second squared.
Industry:Astronomy
1) A process by which a star accumulates matter as it moves through a dense cloud of interstellar gas; or, more generally, whereby matter surrounding a star flows toward it (as in close binaries.)
2) Collection of material together, generally to form a single body.
Industry:Astronomy
The theory by which planetesimals are assumed to collide with one another and coalesce, eventually sweeping up enough material to form the planets.
The theory according to which planetesimals collide with each other and joined , ultimately obscuring enough material to form planets.
Industry:Astronomy
Lens (or combination of lenses) that brings different wavelenghts within a ray of light to a single focus, thus overcoming chromatic aberration. It was first successfully made by Joseph von Fraunhofer.
Industry:Astronomy
A lens of two or more components with different refraction indices (e.g., crown glass and flint glass), used to correct for chromatic aberration.
Industry:Astronomy
1) Active galactic nuclei are very luminous. Their energy output is in two forms: nonthermal continuum and thermal emission line.
2) Any galaxy which is emitting large quantities of non-thermal radiation.
Industry:Astronomy
Controlling the shape of a telescope mirror at a relatively slow rate.
Industry:Astronomy
Compensating for atmospheric distortions in a wavefront by high-speed changes in the shape of a small, thin mirror.
Industry:Astronomy
