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The slow rotation of the major axis of a planet's orbit in the same direction as the revolution of the planet itself, due to gravitational interactions with other planets and/or other effects (such as those due to general relativity.)

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行业/领域：天文学
类别普通天文学
Company: Caltech
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教育; 教学

The movement from one educational stage or developmental level to another.

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Function words; preposition; touching a surface or an object.

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天文学; 普通天文学

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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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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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.

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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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行业/领域：娱乐类别音乐

Адам Јанг

American musician who founded the band, Owl City, via MySpace. He was signed onto Universal Republic record company in 2009. Before signing on with ...