алкални земни метали

алкални земни метали

Element in the second column of the periodic table (from the left.)

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行业/领域：天文学
类别普通天文学
Company: Caltech
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Fine jewelry and jewelry settings are crafted of metal. Common metals include gold, silver, platinum and titanium. Metals can be used in pure form or combined to increase ...

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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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天文学; 普通天文学

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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天文学; 普通天文学

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

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天文学; 普通天文学

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

зголемување

天文学; 普通天文学

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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天文学; 普通天文学

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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Kristina Ivanovska

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行业/领域：个人生活类别离婚

разводна постапка

A formal ceremony to officially end a marriage by exchanging divorce vows and returning the wedding rings. As divorce becomes more common, a divorce ...