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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.
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
1) U Aristotelovoj fizici, peti element od koga su napravljene planete i zvezde
2) U klasičnoj fizici, nevidljivi medijum za koji se smatralo da prožima ceo prostor
Industry:Astronomy
Veština dovođenja delova univerzmuma ka savršenom stanju, prema kome se smatra da teže - npr zlato za metale, besmrsnost za ljudska bića
Industry:Astronomy
1) Spontaneous emission by a heavier element (such as uranium) of positively charged helium nuclei - alpha particles - comprising 2 protons and 2 neutrons. The result of this radioactive decay is that the original element is very gradually converted into another element, with a decreased atomic number and mass. Alpha particle emission may be simultaneous with beta particle decay.
2) The disintegration of an atomic nucleus, in which the final products are an alpha particle and a nucleus with two fewer protons and two fewer neutrons than the original.
Industry:Astronomy
