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Buried mare basalt lavas on the Moon. Many light plains in the lunar highlands have impact craters surrounded by dark piles of ejecta, nicknamed "dark-haloed craters. " The dark-haloed craters formed when mare basalt lava flows were covered with ejecta from large impact craters and basins, and then small craters punctured through the ejecta to toss out mare basalt.

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Галузь/тема: Astronomy
Category: Planetary science
Company: PSRD
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Astronomy; Planetary science

A large cloud of dust and gas which escapes from the nucleus of an active comet.

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Astronomy; Planetary science

Materials loosely packed and not cemented together.

стандартты орта мұхит суы (СОМС)

Astronomy; Planetary science

A precise definition of the isotopic composition of water on Earth. It serves as a reference standard for comparing hydrogen and oxygen isotope ratios. For example, cosmochemists ...

метан

Astronomy; Planetary science

A compound composed of carbon and hydrogen: CH 4 .

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Astronomy; Planetary science

In astronomy, a comet with an orbital period greater than 200 years.

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Astronomy; Planetary science

Processes that change the physical structure, optical properties, or chemical or mineralogical properties of the surface of an airless planetary body from their original state. ...

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Received Pronunciation (RP), also called the Queen's (or King's) English,[1] Oxford English,[2] or BBC English, is the accent of Standard English in ...