Question: When a nuetron hits an atom if U-235 and splits into Barium and Krypton tbree nuetrons and immense amounts of energy are released

Answer: Nuclear fission

Question: When U-235 is compacted together into critical mass and the three neutrons will hit more atoms of U-235

Answer: Fission chain reactions

Question: Using the energy of a fission chain reaction in order to form a tremendous explosion

Answer: Atomic bombs

Question: When two isotopes of hydrogen combine and produce helium & tremendous amounts of energy; comes from the mass changing directly into energy

Answer: Nuclear fusion

Question: Why is fusion difficult?

Answer: The two nuclei of the hydrogen isotopes repel each other

Question: Using the energy of fusion in order to form a tremendous weapon

Answer: Hydrogen bomb

Question: Uses fusion, that is initiated by its tremendous gravity

Answer: Sun

Question: Discovered helium by using a spectrographic analysis of the sun’s light

Answer: Pierre Janssen

Question: Discovered that the sun was primarily composed of hydrogen and helium

Answer: Cecilia Payne

Question: What process cannot happen within the sun and why?

Answer: Combustion; no oxygen