- Capella (stars.astro.illinois.edu)
CAPELLA (Alpha Aurigae). In early mid-northern winter evenings, Capella shines almost directly overhead, and is one of the three bright stars spread around the northern sky, the others Arcturus of spring and Vega of summer.
- Planetary nebula (Wikipedia)
A planetary nebula is a type of emission nebula consisting of an expanding, glowing shell of ionized gas ejected from red giant stars late in their lives.