Question

Write an essay about one of the following scientists who contributed significantly to the theory of cosmology and stellar evolution. 

a. George Gamow 

c. Hans Bethe 

b. Fred Hoyle 

d. Edwin Hubble

Answer 1

a. George Gamow: Nucleosynthesis by neutron capture and the hydrogen-fusion reaction in stellar cores. 

b. Fred Hoyle: Steady-state cosmology and spontaneous creation of hydrogen nuclei in intergalactic space. 

c. Hans Bethe: CNO-cycle for hydrogen fusion in the Sun catalyzed by ¹²₆C. 

d. Edwin Hubble: Expansion of the Universe indicated by the red-shift of the light received from distance galaxies.