The following events happen during Big Bang nucleosynthesis EXCEPT
fusion of protons and neutrons to form hydrogen
collision of quarks and gluons into subatomic particles
cooling of the temperature
fusion of helium into iron
This graph shows the relative abundance of elements in the universe and their number of protons. Which of the following explains how elemental abundance in the universe supports the Big Bang theory?
The elemental abundance shows that the universe is expanding because there are more elements found today than in the past.
The elemental abundance shows that the universe started from a singularity because the most abundance element, the hydrogen, only has 1 proton.
The elemental abundance shows that the universe is expanding because the elements have increasing amount of protons.
The elemental abundance shows that the universe started from a singularity because we can extrapolate the amount of H back in time to an infinitely small and dense beginning.
The more massive a main sequence star, the __________ its temperature because __________
higher; it burns heavier elements, which burn hotter
lower; the nuclear fusion is deeper in the star
higher; it must burn more hydrogen to keep from collapsing
lower; it burns heavier elements, which burn cooler
The dark line emission spectra used to determine the elemental composition of stars represents __________ emitted from the stars.
visible light spectrum
the entire electromagnetic spectrum
microwave radiation
infrared spectrum
Nuclear fusion in the stars can only form elements up to Fe26 because
the star is dying when Fe26 is made
there is insufficient atoms to fuse
there is insufficient energy to fuse Fe26 to H or He atoms
the star is going to explode
By analyzing the spectrum of light from distant galaxies, astronomers learned that they are
brighter when they are closer to us
hotter the farther out they are
moving away from us
made of different materials
The star's color is determined by
temperature at its core
size of the star
brightness of the star
mass of the star
Which of the following cluster of stars represent the red super giants?
A
C
B
D
Use the elemental spectrum to determine the type of elements found in the spectroscopic analysis of a star.
The star has all the elements.
The star has very little elements.
The star has hydrogen, helium, and carbon.
The star has hydrogen and helium.
A __________ can only be seen indirectly because it emits no light.
supernova
black hole
white dwarf
white hole
By analyzing the redshift of light from distant galaxies, astronomers learned that they are