Stephenson 2 DFK 49 size and scale context

Stephenson 2 DFK 49 is an extreme red supergiant whose quoted size remains highly uncertain because its outer layers are diffuse and difficult to define. Even so, plausible estimates make it so enormous that its photosphere could approach or even engulf Jupiter’s orbit if placed at the center of the Solar System. Read its scale context, comparisons, and journey links on the canonical object page.