Asteroids Clusters Comets Concepts Constellations Galaxies Moons Nebulae Planets and Moons Stars Surface Features

Menus

Catalogues

Tools and Links

eSky © copyright
Mark Fisher
1999-2008
Optical Double
A term that describes two unrelated stars that appear close together in the sky, but only because they lie on the same line of sight from the Earth.
Indexes
  • Main Index
  • Concepts Index
    		•  Related Entries
  • Omicron Capricorni
    		•