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Astro 1 Exam 4 Questions And Correct
Answers/ Latest Update / Already
Graded
The radius of the event horizon of the supermassive black hole at the
center of the Milky Way Galaxy is
A) about 100 Astronomical Units.
B) There is no supermassive black hole at the center of the Milky
Way.
C) about 50 Megaparsecs
D) about 1000 light years
E) about 100,000 light years
Ans: A
How could the universe be accelerating, despite the gravitational
pull of all the matter in it?
A) There's no friction in space.
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B) There could be less dark matter than we think.
C) There could be a new force or property of space that affects the
universe on its largest scales. D) Our laws of nature are incorrect.
E) Probably B and C
Ans: C
The redshifts of galaxies are found to be larger
A) for galaxies that are moving towards us.
B) for galaxies that are in the Local Group than for galaxies that are
outside of the Local Group. C) for galaxies that are further away.
D) for galaxies that are older.
E) for dwarf galaxies than for spiral galaxies.
Ans: C
What is the difference between an E0 and an E7 galaxy?
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A) There is no such thing as an E0 galaxy.
B) The E7 has a circular shape and E0 is oval.
C) The E7 has an oval shape and the E0 is circular. D) The E7 has a
larger disk than the E0.
E) The E7 has a smaller disk than the E0.
Ans: C
Which of the following is TRUE?
A) It is possible for galaxies that are very distant to actually move
through space at a speed several
times the speed of light.
B) We measure a redshift for roughly half of the galaxies that we
observe, and for the others we
measure a blueshift.
C) The center of the universe is located at a point about 200 Mpc
from us in the center of a cluster
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of galaxies.
D) At the time that the Big Bang expansion began, all matter and
energy in our observable universe
was compressed into a single point of space.
E) A redshift occurs when a photon loses energy and slows down as
it moves through space.
Ans: D
A nova is
A) a star that is invisible and then becomes visible for several minutes
because the planetary debris
surrounding it moves aside.
B) a star that blows off its outer layers when it reaches the end of its
main sequence lifetime.
C) a star that suddenly brightens and then goes to its normal
brightness again, and then the process
Astro 1 Exam 4 Questions And Correct
Answers/ Latest Update / Already
Graded
The radius of the event horizon of the supermassive black hole at the
center of the Milky Way Galaxy is
A) about 100 Astronomical Units.
B) There is no supermassive black hole at the center of the Milky
Way.
C) about 50 Megaparsecs
D) about 1000 light years
E) about 100,000 light years
Ans: A
How could the universe be accelerating, despite the gravitational
pull of all the matter in it?
A) There's no friction in space.
,2 | Page
B) There could be less dark matter than we think.
C) There could be a new force or property of space that affects the
universe on its largest scales. D) Our laws of nature are incorrect.
E) Probably B and C
Ans: C
The redshifts of galaxies are found to be larger
A) for galaxies that are moving towards us.
B) for galaxies that are in the Local Group than for galaxies that are
outside of the Local Group. C) for galaxies that are further away.
D) for galaxies that are older.
E) for dwarf galaxies than for spiral galaxies.
Ans: C
What is the difference between an E0 and an E7 galaxy?
,3 | Page
A) There is no such thing as an E0 galaxy.
B) The E7 has a circular shape and E0 is oval.
C) The E7 has an oval shape and the E0 is circular. D) The E7 has a
larger disk than the E0.
E) The E7 has a smaller disk than the E0.
Ans: C
Which of the following is TRUE?
A) It is possible for galaxies that are very distant to actually move
through space at a speed several
times the speed of light.
B) We measure a redshift for roughly half of the galaxies that we
observe, and for the others we
measure a blueshift.
C) The center of the universe is located at a point about 200 Mpc
from us in the center of a cluster
, 4 | Page
of galaxies.
D) At the time that the Big Bang expansion began, all matter and
energy in our observable universe
was compressed into a single point of space.
E) A redshift occurs when a photon loses energy and slows down as
it moves through space.
Ans: D
A nova is
A) a star that is invisible and then becomes visible for several minutes
because the planetary debris
surrounding it moves aside.
B) a star that blows off its outer layers when it reaches the end of its
main sequence lifetime.
C) a star that suddenly brightens and then goes to its normal
brightness again, and then the process
