COMPLETE ME (21-30)
Direction: Write the letter that corresponds to the word that best suited the paragraph Write in BIG LETTER the letter
of the correct answer in the space provided. Note: Not following instructions may invalidate your answers.
A supernova
B. Sun
C. burning
D. nuclear fusion
E. Fred Hoyle
F Big Bang
G. planetary nebula
H. chemical elements
I. lithium
J. red giant star
Stellar Nucleosynthesis is the creation of ________
by __________
reactions within stars. It has
occurred since the original creation of hydrogen, helium, and ___________
during the __________
As a
predictive theory, it yields accurate estimates of the observed abundances of the elements. It explains why the observed
abundances of elements change over time and why some elements and their isotopes are much abundant than others
The theory was initially proposed by _________
Stars evolve because of changes in their composition (the abundance of their constituent elements) over their
lifespans, first by ________
hydrogen (main sequence star), then helium _______, and progressively
burning higher elements. However, this does not by itself significantly alter the abundances of elements in the universe
as the elements are contained within the star. Later in its life, a low-mass star will slowly eject its atmosphere via stellar
wind forming a _________
while a higher-mass star will eject mass via a sudden catastrophic event called a
_________
A second stimulus to understanding the process of stellar nucleosynthesis occurred during the 20th
century, when it was realized that the energy released from nuclear fusion reactions accounted for the longevity of the ______________
as a source of heat and light.
