Concept
Emission Line
A bright peak in a spectrum.
A bright feature in a spectrum produced when atoms or molecules emit photons at specific wavelengths from excited energy levels.
Overview
A bright feature in a spectrum produced when atoms or molecules emit photons at specific wavelengths from excited energy levels.
See also
Apparent & Absolute Magnitude
How astronomers measure brightness.
Apparent Magnitude
How bright an object looks from Earth.
Absolute Magnitude
Intrinsic brightness on a standard scale.
Bolometric Magnitude
Brightness across all wavelengths.
Absorption Line
A dark notch in a spectrum.
The Big Bang
How everything began, 13.8 billion years ago.