Astronomical Dictionary on Letter #R

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Radiant

The point on the Celestial Sphere where the meteors of a meteor shower appear to originate. Meteor s...

Radiant

Red Giant

A type of star with high luminosity and low temperature, eg Betelgeuse in Orion... ...

Red Giant

Red Shift

The lengthening of the wavelength of electromagnetic radiation caused by relative motion between sou...

Red Shift

Resolution

The amount of small detail visible in an image (usually telescopic); low resolution shows only large...

Resolution

Retrograde

Rotation of a planet, or orbit, opposite to that normally seen. ...

Retrograde

Right Ascension

The angular distance, measured Eastwards, from the Vernal Equinox. It is one of the ordinates used t...

Right Ascension

Relief

The maximum regional difference in elevation....

Relief

Rhea

In Greek mythology, mother of Zeus and wife of Cronos the Titan ....

Rhea

Rift

A valley formed at a divergence zone or other area of extension....

Rift

Rille

One of several trenchlike, or cracklike valleys up to several hundred km long and 1-2 km wide common...

Rille
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