Milky Way
The Milky Way is a spiral galaxy containing hundreds of billions of stars, including our Solar System.
30.66 kpcDiameterWorlds apart
Milky Way vs Local Group
What are they, and what does the difference actually look like?
Two things. One honest scale.
Meet the pair
What these two things are
Local Group
The Local Group is a collection of galaxies that includes the Milky Way, Andromeda, and several smaller galaxies.
3.066 MpcDiameterLocal Group has about 100 times the diameter of Milky Way.
01
Milky Way30.66 kpcDiameter
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Local Group3.066 MpcDiameter
Inset ×22.7Milky Way is too small to see clearly at this scale. The ring marks its position; only the inset is enlarged.
Measurements, assumptions & sources +
Milky Way
A rounded 100,000 light-year span of the stellar disk. Faint stars and the dark-matter halo extend farther; galaxies have no crisp rim.
The marked diameter is calibrated. Unmeasured illustration details are representative.
Local Group
A rounded 10 million light-year span for the neighbourhood of galaxies. Galaxy groups have no solid edge.
Defined examples — our methodology
The marked diameter is calibrated. Unmeasured illustration details are representative.
Change the comparison
Put something else beside it.
Measurement details
Why these numbers?
The visual compares diameter with diameter. The records below preserve each value’s basis and caveats.
Milky Way
30.66 kpcDiameter · approximate
A rounded 100,000 light-year span of the stellar disk. Faint stars and the dark-matter halo extend farther; galaxies have no crisp rim.
Local Group
3.066 MpcDiameter · rounded reference
A rounded 10 million light-year span for the neighbourhood of galaxies. Galaxy groups have no solid edge.
- Comparing
- Diameter ↔ Diameter
- Relative size
- Local Group is larger on this measurement by a factor of about 100.
How to read the visual
The labelled spans and stored measurements determine the scale; unmeasured illustration details do not.
- Milky Way is labelled approximate; treat the displayed value as a comparison anchor rather than false precision.
- Local Group is labelled rounded reference; treat the displayed value as a comparison anchor rather than false precision.
There’s always another scale
Follow your curiosity.
SpaceMilky Way30.66 kpcThe Milky Way is a spiral galaxy containing hundreds of billions of stars, including our Solar System.SpaceLocal Group3.066 MpcThe Local Group is a collection of galaxies that includes the Milky Way, Andromeda, and several smaller galaxies.
SpaceSun1,391,000 kmThe Sun is the star at the centre of the Solar System.
SpaceDistance to the galactic centre7.972 kpcThis is the distance from the Solar System to the centre of the Milky Way galaxy.SpaceAndromeda galaxy79.72 kpcThe Andromeda galaxy, also called M31, is the nearest large spiral galaxy to the Milky Way.
SpaceObservable universe28.21 GpcThe observable universe is the region from which light or other signals have had time to reach us since the early universe.SpaceEarth–Sun distance1 AUThe Earth–Sun distance, or astronomical unit, is the standard measure of separation between Earth and the Sun used in astronomy.Side by side
Another point of view.
