COSMIC ADDRESS
Registered entity:
Planet Surface
Third terrestrial rocky planet orbiting in the circumstellar habitable zone.
Planet Earth
Equatorial diameter: 12,742 km · Mean orbital distance: 1.00 AU (149.6 million km).
Solar System
Gravitationally bound system centered on Sol (G-type yellow dwarf star), extending to the Oort Cloud (~100,000 AU).
Local Interstellar Bubble
A cavity in the interstellar medium roughly 300 light-years across, carved by ancient supernovae millions of years ago.
Orion-Cygnus Arm
Minor spiral arm bridge situated between the Sagittarius Arm and the Perseus Arm of the Milky Way.
Milky Way Galaxy
Barred spiral galaxy spanning ~100,000 light-years. Our Sun is located ~26,000 light-years from supermassive black hole Sagittarius A*.
The Local Group
Gravitationally bound cluster of 54+ galaxies, dominated by the Andromeda Galaxy (M31), Milky Way, and Triangulum Galaxy.
Laniakea Supercluster
Immense gravitational watershed containing ~100,000 galaxies across 520 million light-years, flowing toward the Great Attractor.
Pisces-Cetus Supercluster Complex
One of the largest known cosmic web filament superstructures, measuring approximately 1 billion light-years in length.
The Observable Universe
The cosmic sphere reachable by light since the Big Bang: ~93 billion light-years in diameter, containing an estimated 2 trillion galaxies.