ASTRO 1 EXAM 4 NEWEST 2025 ACTUAL EXAM COMPLETE
100 QUESTIONS AND CORRECT DETAILED ANSWERS
(VERIFIED ANSWERS) |ALREADY GRADED A+||BRAND NEW
VERSION!!
Considering the contents of the Universe (including dark matter and
dark energy), Hydrogen and Helium are
A) only 30 percent of the total.
B) only half of the total.
C) less than 1 percent of the total. D) less than 5 percent of the total.
E) about 70 percent of the total. - - ANS✔️--D
The Sun is located
A) in the halo of the Milky Way, near its outer edge.
,B) in the halo of the Milky Way, about half way out.
C) in the bulge of the Milky Way.
D) very near the supermassive black hole at the center of the Galaxy.
E) in the disk of the Milky Way, about half way out. - - ANS✔️--E
How would you describe the distribution of galaxies in the Local
Group?
A) The dwarfs are in the center clustered together and the two big
galaxies off to the side. B) The big galaxies are together at the center
and the dwarfs are in a big circle around them. C) The two larger
galaxies are on one side of the group and all the dwarfs on the other
side. D) There are the two big galaxies, and then the dwarfs seem to
be clustered around them. E) They just look randomly distributed. - -
ANS✔️--D
What fraction of the energy density of the Universe is dark matter? A)
71%
B) 5% C) 1% D) 24% E) 99% - - ANS✔️--D
, Why can't we see back the whole way to the Big Bang? A) Radiation is
blueshifted out of the visible range. B) Not enough photons were
produced.
C) Our telescopes could never be powerful enough. D) It would take
too long for light to travel that far. E) The radiation scatters off matter
frequently so the Universe is opaque. - - ANS✔️--E
Which force has as its boson the photon? A) gravity
B) strong
C) none of the forces do D) electromagnetic
E) weak - - ANS✔️--D
How have astronomers interpreted the unexpectedly fast rotation of
galaxies? A) Scientific measurements must be wrong.
B) Galaxies may be breaking up.
C) There must be a lot of dark matter whose gravity can be felt but not
seen. D) These galaxies must have had collisions.
E) B, C, and D - - ANS✔️--E
100 QUESTIONS AND CORRECT DETAILED ANSWERS
(VERIFIED ANSWERS) |ALREADY GRADED A+||BRAND NEW
VERSION!!
Considering the contents of the Universe (including dark matter and
dark energy), Hydrogen and Helium are
A) only 30 percent of the total.
B) only half of the total.
C) less than 1 percent of the total. D) less than 5 percent of the total.
E) about 70 percent of the total. - - ANS✔️--D
The Sun is located
A) in the halo of the Milky Way, near its outer edge.
,B) in the halo of the Milky Way, about half way out.
C) in the bulge of the Milky Way.
D) very near the supermassive black hole at the center of the Galaxy.
E) in the disk of the Milky Way, about half way out. - - ANS✔️--E
How would you describe the distribution of galaxies in the Local
Group?
A) The dwarfs are in the center clustered together and the two big
galaxies off to the side. B) The big galaxies are together at the center
and the dwarfs are in a big circle around them. C) The two larger
galaxies are on one side of the group and all the dwarfs on the other
side. D) There are the two big galaxies, and then the dwarfs seem to
be clustered around them. E) They just look randomly distributed. - -
ANS✔️--D
What fraction of the energy density of the Universe is dark matter? A)
71%
B) 5% C) 1% D) 24% E) 99% - - ANS✔️--D
, Why can't we see back the whole way to the Big Bang? A) Radiation is
blueshifted out of the visible range. B) Not enough photons were
produced.
C) Our telescopes could never be powerful enough. D) It would take
too long for light to travel that far. E) The radiation scatters off matter
frequently so the Universe is opaque. - - ANS✔️--E
Which force has as its boson the photon? A) gravity
B) strong
C) none of the forces do D) electromagnetic
E) weak - - ANS✔️--D
How have astronomers interpreted the unexpectedly fast rotation of
galaxies? A) Scientific measurements must be wrong.
B) Galaxies may be breaking up.
C) There must be a lot of dark matter whose gravity can be felt but not
seen. D) These galaxies must have had collisions.
E) B, C, and D - - ANS✔️--E
