All things · Between the Stars
One light-year: how big is it?
One light-year is about 1 light-years. In everyday terms, that is ≈ 1,050 Solar Systems (to Neptune).
- Size
- 1 light-years
- In metres
- 9.46 × 10¹⁵ m
- Everyday comparison
- ≈ 1,050 Solar Systems (to Neptune)
- Chapter
- Between the Stars
Did you know?
The distance light travels in a year: about 9.46 trillion km.
How it compares
- About 1,100× bigger than Neptune's orbit (9 billion km).
- About 4.2× smaller than Distance to nearest star (4.24 light-years).
Other things of a similar size
- Betelgeuse 1.06 billion km
- Neptune's orbit 9 billion km
- Distance to nearest star 4.24 light-years
- Orion Nebula 24 light-years
- Omega Centauri 150 light-years
- Large Magellanic Cloud 31,700 light-years
Sizes are rounded, typical values drawn from standard reference sources, including NIST/CODATA physical constants and NASA's planetary fact sheets. Real objects vary; see About for how sizes are chosen.