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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 ...

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Astronomy; General 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 ...

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Astronomy; General astronomy

Controlling the shape of a telescope mirror at a relatively slow rate.

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Astronomy; General astronomy

A unit for measuring acceleration, which is metre per second squared.

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Astronomy; General 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 ...

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Astronomy; General astronomy

The theory by which planetesimals are assumed to collide with one another and coalesce, eventually sweeping up enough material to form the planets.

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Ngành nghề/Lĩnh vực: Fruits & vegetables Category: Root vegetables

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Annual or biennial plant (Raphanus sativus) of the mustard family, probably of Oriental origin, grown for its large, succulent root. Low in calories ...