1. The Crab Nebula is the result of athat was witnessed on Earth in the year 1054.
2. Betelgeuse is a supergiant star that will eventually supernova, which means that by mass it is classified as a.
3. The debris from the death of a high-mass star forms aseveral light years across.
4. Ahas a density higher than the density of a white dwarf.
5. actually occurred about 150,000 years ago in the Large Magellanic Cloud.
6. Theis the process by which hydrogen fusion proceeds in high-mass stars.
7. Carbon can be converted into oxygen in the cores of high mass stars if carbon nuclei undergo a.