Light years
Those are all measures of length.
It was measured in 1887.
61 Cygni61 Cygni first attracted the attention of astronomers because of its large proper motion. In 1838, Friedrich Wilhelm Bessel measured its distance from Earth at about 10.4 light years, very close to the actual value of about 11.4 light years.
Stellar distances are measured in light-years, which is the average distance between the Earth and the Sun.
Stars are not measured in light years. The distance between them is.
They are measured in light years. Galaxies are often 100,000 light years across or more.
Light Years.
Anything can be measured in light time. The moon is about 1.3 light seconds (0.0000000412 light years) from the earth. The closest star system, which includes Alpha Centauri, is 4.3 light years away.
in light years
light years.
Light years
Light Years
Usually such distances are measured either in light-years, or in parsecs.
light years
parsecs or light years
Light years or Parsecs