Stars in the main-sequence stage give out energy as light and heat. This energy is released by nuclear fusion reactions deep in their cores. The reactions fuse hydrogen nuclei to create helium. Stars spend about 90% of their lives in this stage. Our Sun is about 5,000 million years into its 10,000 million year main-sequence.
Year born: 1910
Research Areas: Stellar Evolution, Black Holes
"My motive has not been to solve a single problem, but to acquire a perspective of an entire area"