Length & distance

Just how long is 1 × 10⁹ light-years?

Deep space

1 × 10⁹ ly

9.4607 × 10²⁴ mmetres

3.1039 × 10²⁵ ftfeet

5.8786 × 10²¹ mimiles

6.3241 × 10¹³ AUastronomical units

1 × 10⁹ light-years306.6 MpcLength · definition

Laniakea-scale region159.4 MpcDiameter · rounded reference

Both marked spans share one linear scale. Artwork keeps its proportions; poses and surface detail are illustrative.

A little perspective

The length of 1 × 10⁹ light-years is about 1.92 times the diameter of Laniakea-scale region.

Measurements, assumptions & sources +

The quantity is exact as entered. Comparisons use the clearly stated specimen, model or nominal measurement.

An illustrative 520 million light-year span for a large-scale galaxy-flow region; boundaries depend on the model.

The marked diameter is calibrated. Unmeasured illustration details are representative.

Measurement details

The visual compares length with diameter. The records below preserve each value’s basis and caveats.

306.6 Mpc

Length · definition

The quantity is exact as entered. Comparisons use the clearly stated specimen, model or nominal measurement.

159.4 Mpc

Diameter · rounded reference

An illustrative 520 million light-year span for a large-scale galaxy-flow region; boundaries depend on the model.

Comparing: Length ↔ Diameter
Relative size: 1 × 10⁹ light-years is larger on this measurement by a factor of about 1.92. 1 × 10⁹ light-years's selected measurement is approximately 92.3% greater than Laniakea-scale region's.

The labelled spans and stored measurements determine the scale; unmeasured illustration details do not.

Laniakea-scale region is labelled rounded reference; treat the displayed value as a comparison anchor rather than false precision.

Change your perspective

Choose a suggestion to redraw the comparison, or open its page to learn what it is.

A little smaller. A little larger.