Giant stars
Our local star, the Sun, is roughly 1.4 million kilometres across. That's large - 100 times the diameter of Earth - but is tiny compared to many others. One of the contenders for largest known star is UY Scuti. If placed at the centre of the Solar System it would stretch beyond the orbit of Jupiter.
| Star name | Radius (Solar) | Reference | Spectral type |
|---|---|---|---|
| Delta Boötis | 10.5 | 1999AJ....118.3032N | G8IV |
| Arcturus | 25.4 | 2011ApJ...743..135R | K0III |
| Aldebaran | 44.2 | 2005A&A...433..305R | K5III |
| Canopus | 65 | David Darling Encyclopedia of Science | A9II |
| Rigel A | 78 | 2012ApJ...747..108M | B8 Iae |
| Peony Nebula Star | 100 | spacemath.gsfc.nasa.gov | O5 (Ofpe) |
| Epsilon Geminorum | 140 | 1999AJ....118.3032N | G8Ib |
| Deneb | 203 | 2008A&A...479..849S | A2Ia |
| The Pistol Star | 306 | 2009ApJ...691.1816N | B5 (LBV) |
| Alpha Herculis | 460 | 2004A&A...418..675P | M5Ib-II |
| Betelgeuse | 1200 | 2009AJ....137.3558S | M1-M2Ia-ab |
| UY Scuti | 1708 | 2013A&A...554A..76A | M4Ia |