Phenomenon
Elongation
An inner planet's angular distance from the Sun.
The angle between Mercury or Venus and the Sun. Greatest elongation marks the best viewing window in twilight.
Overview
The angle between Mercury or Venus and the Sun. Greatest elongation marks the best viewing window in twilight.
See also
Axial Precession
The slow wobble of a planet's rotation axis.
Fast Radio Burst
A millisecond pulse of radio waves from extragalactic distance.
Anti-greenhouse Effect
Atmospheric haze cooling a planet's surface.
Atmospheric Escape
Gas leaking from a planet's atmosphere into space.
Magnetosphere
A planet's magnetic shield against the solar wind.
Volcanism
Eruption of molten rock through a planet's crust.