Astronomical Dictionary on Letter #P

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Pahoehoe

A basaltic lava with a smooth, undulating surface....

Pahoehoe

Parallax

The angular difference in apparent direction of an object seen from two different viewpoints. This o...

Parallax

Parsec

The distance at which a star (or other object) would have a parallax of 1" (one second of arc)....

Parsec

Penumbra

The partial shadow or darkness of an eclipse. Means, literally, "dim light". It most often refers ...

Penumbra

Periapsis

A genericterm. The point in an orbit closest to a body other than the Sun or the Earth. For bodies ...

Periapsis

Perigee

From the Greek "near the Earth." The point in its orbit where the Moon, or planet is closest to...

Perigee

Perihelion

From the Greek "near the Sun." The point in its orbit when an object is closest to the Sun. Opposite...

Perihelion

Perturb

To cause a celestial body, to deviate from its predicted orbit, usually under the gravitational infl...

Perturb

Photosphere

The visible surface of the Sun; ...

Photosphere

Plage

Bright regions in the Sun's chromosphere. ...

Plage

Planisphere

An aid to locatiing stars and constellations in the night sky. It consists of two discs. One with th...

Planisphere

Precession

Also called Precession of the Equinoxes. Circular motion about the axis of rotation of a body; fixed...

Precession

Prominence

A cloud, or plume, of hot, luminous gas in the Sun's corona. It appears bright when seen against the...

Prominence

Phobos

In Greek mythology, a son of Ares (Mars) who, with brother Deimos, was a constant companion to his f...

Phobos

Plateau

Any comparatively flat area of great extent or elevation....

Plateau

Plume

A buoyant mass of hot, partially molten mantle material that rises to the base of the lithosphere....

Plume

Pluto

Planet ninth in order, and farthest, from the sun. In Greek mythology, god of the dead and the under...

Pluto

Prometheus

A Greek mythological hero who gave humankind fire....

Prometheus
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