Phenomenon
Photoionization
Photons knocking electrons out of atoms.
The process where an atom or molecule absorbs a photon and ejects an electron — drives the ionisation of H II regions and intergalactic gas.
Overview
The process where an atom or molecule absorbs a photon and ejects an electron — drives the ionisation of H II regions and intergalactic gas.
See also
Inverse Compton Scattering
Low-energy photons boosted by fast electrons.
Thomson Scattering
Low-energy photons bouncing off free electrons.
Pair Production
Photons converting into matter–antimatter pairs.
Solar Eclipse
When the Moon stands between Earth and Sun.
Lunar Eclipse
When Earth's shadow falls on the Moon.
Meteor Showers
Cosmic dust burning in our atmosphere.