Life Cycle of the Stars

The formation of elements is known as _________.

• nucleotides
• Synthogenesis
• nuclear fission
• nucleosynthesis

The first elements were formed in what is known as _________________.

• Big Bang Nucleosynthesis
• Stellar Nucleosynthesis
• Supernova Nucleosynthesis
• Genonucleosynthesis

The two elements formed in Big Bang Nucleosynthesis where __________________.

• hydrogen and lithium
• hydrogen and helium
• hydrogen and oxygen
• helium and lithium

The key ratio found in the universe that confirms the Big Bang is _______.

• 25% hydrogen and 75% helium
• 75% hydrogen and 75% helium
• 75% hydrogen and 25% lithium
• 75% hydrogen and 25% helium

________ nucleosynthesis happens in the center of stars and is where the elements helium through iron (Fe) are formed. 

• Big Bang
• Stellar
• Supernova
• Superdupernova

Stellar nucleosynthesis stops at the element of iron because there are _________ in their nuclei.

• not enough protons
• not enough electrons
• not enough protrons
• not enough neutrons

All elements bigger than iron on the periodic table are formed in _________________.

• Big Bang Nucleosynthesis
• Stellar Nucleosynthesis
• Supernova Nucleosynthesis
• Genonucleosynthesis

A star will spend ______ of it's life turning hydrogen into helium.

• 100%
• 99%
• 90%
• 50%

Three elements made in the fusion of helium are ________________.

• hydrogen, helium, and lithium
• carbon, nitrogen, and oxygen
• helium, nitrogen, and oxygen
• carbon, nitrogen, and iron

When a star builds up too much iron, it ______.

• regenerates
• starts over burning hydrogen
• dies
• starts unmaking iron and goes backwards