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aurora boreal

an aurora ocurring in the northern hemisphere of the Earth

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boreal
Geography; Physical geography

Most usually used to mean northern in reference to latitudes 45°-75°n and in association with the largely coniferous forests found here.

aurora
Astronomy; Access control systems

A glow in a planet's ionosphere caused by the interaction between the planet's magnetic field and charged particles from the Sun.

aurora
Education; SAT vocabulary

A luminous phenomenon in the upper regions of the atmosphere.

aurora
Astronomy; General astronomy

the light produced by excited atoms and ions in the upper atmosphere of a planet

Sistema de Procesado de imágenes astronómicas
Astronomy; General astronomy

Developed by the National Radio Astronomy Observatory.

órbita
Astronomy; General astronomy

The path of one object about another (used here for an object orbiting the sun).

meteoros
Astronomy; General astronomy

Small rocky and/or icy particles that are swept up by the earth in its orbit about the sun. Also called "shooting stars", they travel across the sky in a very short time, from ...

equinoccio
Astronomy; General astronomy

Either of the two points (vernal, autumnal) on the celestial sphere where the ecliptic (which is the apparent path of the sun on the sky) intersects the celestial equator. Due to ...

cometa
Astronomy; General astronomy

A celestial body orbiting the sun (though some may be ejected from the solar system by planetary perturbations) that displays (at least during a portion of its orbit) some ...

cenit
Astronomy; General astronomy

The point directly overhead in the sky.

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