ASTRO 1 EXAM 4 NEWEST 2025 ACTUAL EXAM
COMPLETE QUESTIONS AND ANSWERS (VERIFIED
ANSWERS) |ALREADY GRADED A+||BRAND NEW
VERSION!!
About how long does it take light to cross the Milky Way galaxy? - RIGHT ANSWER -About
100,000 years
According to models of galaxy formation, which stars formed first? - RIGHT ANSWER -The
spheroidal population
Compared to spiral galaxies, elliptical galaxies have... - RIGHT ANSWER -Less gas, redder colors,
and less new star formation
How could universe be accelerating, despite gravitational pull of all matter in it? - RIGHT
ANSWER -There could be a new force or property of space that affects the universe on its largest
scale
How did conditions differ from the present era when the universe was young? - RIGHT ANSWER
-The universe was hotter, more dense, and smoother
How do we know that the universe's expansion is speeding up? - RIGHT ANSWER -Look at
objects from different times in the past to see how expansion changes
How do you measure the mass of the super massive black hole at the center of the Milky Way? -
RIGHT ANSWER -Look at the orbits of nearby stars & apply Kepler's 3rd law
, How do you measure the speed of a galaxy relative to you? - RIGHT ANSWER -Doppler shifts
How have astronomers interpreted the unexpectedly fast rotation of galaxies? - RIGHT ANSWER
-There must be a lot of dark matter whose gravity can be felt but not seen
How many types of fundamental particles exist? - RIGHT ANSWER -30
How many up quarks are in Helium-3? - RIGHT ANSWER -5
In the symbol for Hubble type galaxy, SBc, the "B" denotes.... - RIGHT ANSWER -The presence of
a bar
In what part of the spectrum are starburst galaxies brightest? - RIGHT ANSWER -Infrared
We see the most distant galaxies as they were when the universe was... - RIGHT ANSWER
1-2 billion years old
What are the differences between open star clusters and globular star clusters? - RIGHT ANSWER
-Open clusters are less concentrated, younger, and have fewer stars
What does our galaxy look like? - RIGHT ANSWER -All the above; large disk with spiral arms &
relatively flat & thin, clouds of dust & gas in spiral arms, old yellow stars found at center bulge,
old stars & globular clusters located in spherical halo
What forms in nucleosynthesis? - RIGHT ANSWER -Most of the Helium-4 in the Universe
COMPLETE QUESTIONS AND ANSWERS (VERIFIED
ANSWERS) |ALREADY GRADED A+||BRAND NEW
VERSION!!
About how long does it take light to cross the Milky Way galaxy? - RIGHT ANSWER -About
100,000 years
According to models of galaxy formation, which stars formed first? - RIGHT ANSWER -The
spheroidal population
Compared to spiral galaxies, elliptical galaxies have... - RIGHT ANSWER -Less gas, redder colors,
and less new star formation
How could universe be accelerating, despite gravitational pull of all matter in it? - RIGHT
ANSWER -There could be a new force or property of space that affects the universe on its largest
scale
How did conditions differ from the present era when the universe was young? - RIGHT ANSWER
-The universe was hotter, more dense, and smoother
How do we know that the universe's expansion is speeding up? - RIGHT ANSWER -Look at
objects from different times in the past to see how expansion changes
How do you measure the mass of the super massive black hole at the center of the Milky Way? -
RIGHT ANSWER -Look at the orbits of nearby stars & apply Kepler's 3rd law
, How do you measure the speed of a galaxy relative to you? - RIGHT ANSWER -Doppler shifts
How have astronomers interpreted the unexpectedly fast rotation of galaxies? - RIGHT ANSWER
-There must be a lot of dark matter whose gravity can be felt but not seen
How many types of fundamental particles exist? - RIGHT ANSWER -30
How many up quarks are in Helium-3? - RIGHT ANSWER -5
In the symbol for Hubble type galaxy, SBc, the "B" denotes.... - RIGHT ANSWER -The presence of
a bar
In what part of the spectrum are starburst galaxies brightest? - RIGHT ANSWER -Infrared
We see the most distant galaxies as they were when the universe was... - RIGHT ANSWER
1-2 billion years old
What are the differences between open star clusters and globular star clusters? - RIGHT ANSWER
-Open clusters are less concentrated, younger, and have fewer stars
What does our galaxy look like? - RIGHT ANSWER -All the above; large disk with spiral arms &
relatively flat & thin, clouds of dust & gas in spiral arms, old yellow stars found at center bulge,
old stars & globular clusters located in spherical halo
What forms in nucleosynthesis? - RIGHT ANSWER -Most of the Helium-4 in the Universe
