- Blue supergiant (Wikipedia)
A blue supergiant (BSG) is a hot, luminous star, often referred to as an OB supergiant. They are usually considered to be those with luminosity class I and spectral class B9 or earlier, although sometimes A-class supergiants are also deemed blue supergiants.
- Christoph Probst (Wikipedia)
Christoph Ananda Probst (6 November 1919 – 22 February 1943) was a German student of medicine and member of the White Rose (Weiße Rose) resistance group.