Astronomy

Astronomy is defined as the study of the objects that lie beyond our planet Earth and the processes by which these objects interact with one another.

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Geology

Geology (also known as geoscience or Earth science) is the…

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Astrobiology

Astrobiology (also known as exobiology, exopaleontology, and bioastronomy) is an…

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Rheid

In geology, a rheid is a substance whose temperature is…

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Interstellar cloud

An interstellar cloud is a local concentration of gas and…

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Dark matter

Dark matter is matter that can’t be detected directly, but…

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Celestial sphere

The celestial sphere is the apparent sphere of the sky;…

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Celestial axis

The celestial axis is the projection of Earth’s rotation axis,…

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Celestial poles

The celestial poles are the two points where an extension…

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Celestial equator

The celestial equator is the great circle on the celestial…

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Celestial meridian

The celestial meridian is the great circle on the celestial sphere that passes through…

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Celestial longitude

The celestial longitude is the angular distance along the ecliptic from…

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Celestial latitude

The celestial latitude is the angular distance on the celestial sphere…

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Ablation

Ablation is the removal of material from the surface of…

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Coelostat

The coelostat is an astronomical instrument consisting of a system…

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Earth

Atmosphere of Earth The origin of the earth’s atmosphere is…

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Atmosphere

The atmosphere is defined as the gaseous envelope that surrounds…

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Star

A star (like the Sun) is an astronomical object consisting…

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Absorption

Absorption may have different definitions depending on the field of…

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Aberration of starlight

Aberration of starlight is the difference between the observed position…

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Aberration

In optics, the aberration is a flaw in the imaging…

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Sun

The Sun is the star at the center of the…

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Astronomy

Astronomy is defined as the study of the objects that…

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