Convert Fermis (fm) to Light Years (ly) | fm in ly

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# Let's convert Fermis (fm) to Light Years (ly)

This quick and easy calculator will convert Fermis (fm) to Light Years (ly) and show formula, brief history on the units and quick maths for the conversion.

## Quick Reference for Converting Fermis to Light Years

Formula
ly = fm / 9.46055E+30
Quick Rough Maths
To get the Light Years, divide the number of Fermis by 9.46055E+18 trillion
Fermis (fm) in 1 Light Year
There are 9.46055E+30 Fermis in 1 Light Year
Light Years (ly) in 1 Fermi
There are 0 Light Years in 1 Fermi

## Unit Information

Fermi
/ˈfəːmi/
Symbol: fm
Unit System: Non-SI metric

### What is the Fermi?

The fermis is a unit of length in the non-SI metric system and uses the symbol fm.

One fermi is equal to 1×10−15m or 3.9370×10−14 in.

It is used to measure nuclear distances and was named after the Italian physicist Enrico Fermi (1901–1954). It has now been replaced with the SI-derived term femtometre.

Light Year
/lʌɪt jɪə,jəː/
Symbol: ly
Unit System: Astronomical System of Units

### What is the Light Year?

The light year is a unit of length in the Astronomical system of units. It uses the symbol ly.

Often confused with a unit of time as it contains the word "year", it is actually defined by the International Astronomical Union (IAU) as the amount of distance that light travels in a vacuum in one Julian year (365.25 days).

Using the speed of light (299,792,458 m/s or 'c') and the Julian year (as apposed to the Gregorian year which is 365.2425 days), we can equivalate 1 light year as 9,460,730,472,580,800 metres or ≈ 9.46 trillion kilometres.

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