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

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Частина мови: noun
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Галузь/тема: Astronomy
Category: Planetary science
Company: PSRD
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“Neither a borrower nor a lender be,” wrote Shakespeare in “Hamlet”. Actually, the availability of debt, and the willingness to take it on, is a crucial ingredient of economic ...

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An extended interval of time, understood usually within the context of an identifiable geographic region, characterized by a specific set of cultural, economic, social or ...

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Archaeology; Human evolution

In geology, a division of an era, as the Quaternary period of the Cenozoic era.

период

Geography; Physical geography

Geologic time unit that is shorter than an era but longer than a epoch.

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A natural solid object (metallic or stony/silicate) larger than 10 µm (microns) that has traveled through space, by natural means from the celestial body on which it formed, and ...

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An element with atomic number 2; symbol: He. It is the second most common element in the Sun and outer planets, but rare on the rocky planets.

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Astronomy; Planetary science

A hole or depression. Most are roughly circular or oval in outline. On Earth most natural craters are of volcanic origin. On the Moon most are of impact origin.

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Term used to describe the layer of magma, hundreds of kilometers thick; thought to have covered the Moon 4. 5 billion years ago. The timing, duration, cooling rates, convection, ...

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Forces that alter the path of a comet, which are not caused by gravitational interaction with the Sun and planets. Typically this refers to uneven outgassing from vents on the ...

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Astronomy; Planetary science

Person engaged in or trained for spaceflight.

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Галузь/тема: Arts & crafts Category: Oil painting

Мона Лиза

The Mona Lisa is widely recognized as one of the most famous paintings in the history of art. It is a half-length portrait of a seated woman painted ...