SpazeSpiral galaxy, M101
Pinwheel Galaxy
Almost twice as wide as the Milky Way. A supernova lit up one of its arms in 2023.
- Distance
- 21 million light years
- Width
- 170,000 light years
- Stars
- ~1 trillion
Made of
- Dark matter 90%
- Stars 8%
- Gas and dust 2%
Hundreds of billions of stars in a halo of dark matter
Modelled from rotation curves and star counts