Convert length and distance units — meters, feet, inches, kilometers, miles, light years and more.
| Unit | Name | Value |
|---|---|---|
| 0.001 nm | 1.057e-28 ly | |
| 0.01 nm | 1.057e-27 ly | |
| 0.1 nm | 1.057e-26 ly | |
| 1 nm | 1.057e-25 ly | |
| 5 nm | 5.285e-25 ly | |
| 10 nm | 1.057e-24 ly | |
| 50 nm | 5.285e-24 ly | |
| 100 nm | 1.057e-23 ly | |
| 1000 nm | 1.057e-22 ly |
Multiply the number of Nanometers by 1.057×10-25 to get Light Years. Formula: ly = nm × 1.057×10-25. Example: 10 nm × 1.057×10-25 = 1.057×10-24 ly. To reverse, divide Light Years by 1.057×10-25 to get Nanometers.
| Nanometer (nm) | Light Year (ly) |
|---|---|
| 0.001 nm | 1.057×10-28 ly |
| 0.01 nm | 1.057×10-27 ly |
| 0.1 nm | 1.057×10-26 ly |
| 0.5 nm | 5.2849×10-26 ly |
| 1 nm | 1.057×10-25 ly |
| 2 nm | 2.1139×10-25 ly |
| 5 nm | 5.2849×10-25 ly |
| 10 nm | 1.057×10-24 ly |
| 20 nm | 2.1139×10-24 ly |
| 50 nm | 5.2849×10-24 ly |
| 100 nm | 1.057×10-23 ly |
| 250 nm | 2.6424×10-23 ly |
| 500 nm | 5.2849×10-23 ly |
| 1000 nm | 1.057×10-22 ly |
| 10000 nm | 1.057×10-21 ly |
To convert Nanometer to Light Year, multiply by 1.057×10-25. Example: 10 nm = 1.057×10-24 ly
To convert Light Year back to Nanometer, divide by 1.057×10-25 (multiply by 9.461×1024). Use the swap button above.
Start with 100 Nanometers = 1.057×10-23 ly as your reference point. Scale up or down from there.
The most fundamental combination in observational astronomy: measuring spectral lines at nanometre wavelengths to determine redshift, then expressing the resulting distance in light-years. Every galaxy redshift measurement uses both units in the same calculation.
JWST observes from 600 nm to 28,000 nm wavelength while targets range from the Moon (1.3 light-seconds) to the edge of the observable universe (13.8 billion light-years). Both units appear in every JWST observation programme.
Gravitational redshift shifts spectral lines by nanometres in stars and galaxies at light-year distances. Relativistic astrophysicists calculate the nm-scale wavelength shift using ly-scale gravitational potential depths in the same equation.
1 ly = 9.461×10²⁴ nm — nearly 10²⁵ nanometres. Physics educators use nm-to-ly as the most dramatic scale contrast within a single discipline: "From the atom to the cosmos — 25 orders of magnitude within astronomy alone."
Each rung of the cosmic distance ladder involves spectral observations in nanometres combined with distance measurements in light-years, parsecs, or megaparsecs. The nm-to-ly conversion is embedded in every rung from parallax to Type Ia supernovae.
Scientists studying the intergalactic medium measure absorption features at nanometre wavelengths in quasar spectra while describing the path length through the medium in millions of light-years — both units in every IGM paper.
The Nanometer is a unit of Length measurement (symbol: nm). 1 nm = 1.057×10-25 ly. Used in scientific and practical Length measurement applications.
The Light Year is a unit of Length measurement (symbol: ly). It is part of an internationally recognised measurement system used alongside the Nanometer.
The nanometre owes its name to the Greek 'nanos' (dwarf) combined with 'metre'. The prefix 'nano' was formally adopted by the International Committee for Weights and Measures in 1960 as part of the SI prefix system. Before the nanometre became standard, atomic-scale scientists used angstroms (1 nm = 10 Å), a unit named after Swedish spectroscopist Anders Ångström. The nanometre rose to public prominence in the 1980s and 1990s alongside the emergence of nanotechnology and semiconductor manufacturing, where transistor feature sizes first crossed the nanometre threshold around 1995 with the 180nm process node. Today the nanometre defines the entire semiconductor industry — every chip generation is named by its nm node size.
The light-year first appeared in a German publication in 1851 written by Otto Ule as a way to make stellar distances comprehensible to general audiences. It equals the distance light travels in one Julian year: exactly 9,460,730,472,580.8 kilometres. Professional astronomers often prefer parsecs. One light-year equals about 63,241 astronomical units.
Common use: Nanometer to Light Year conversion is needed when working with international standards, scientific publications, or reference materials that use different unit systems for Length measurement.