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Bortle scale
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The Bortle dark-sky scale is a nine-level numeric scale that measures the night sky's brightness of a particular location. It characterizes the observability of celestial objects, taking into account
Representation of the Bortle scale
Representation of the Bortle scale
Milky Way
Videos
The Milky Way or Milky Way Galaxy, or simply the Galaxy, is the galaxy that includes the Solar System, with the name describing the galaxy's appearance from Earth: a hazy band of light seen in the nig
Bortle scale
…and sky quality meter (SQM) measurement of skyglow. At higher classes, light pollution above the horizon is obvious, diffuse light sources such as the Milky Way and Messier objects are invisible to the naked eye, and fewer point light sources such as stars and planets can be seen. At lower classes, light pollution…
The Galactic Center as seen from Earth's night sky (featuring the telescope's laser guide star).
The Galactic Center as seen from Earth's night sky (featuring the telescope's laser guide star).
The Milky Way as seen from a dark site with little light pollution
The Milky Way as seen from a dark site with little light pollution
Photograph of the "Great Andromeda Nebula" from 1899, later identified as the Andromeda Galaxy
Photograph of the "Great Andromeda Nebula" from 1899, later identified as the Andromeda Galaxy
A diagram of the Sun's location in the Milky Way; the angles represent longitudes in the galactic coordinate system
A diagram of the Sun's location in the Milky Way; the angles represent longitudes in the galactic coordinate system