ASTR FINAL EXAM 2025 COMPLETE
QUESTIONBANK WITH NEWEST
QUESTIONS AND CORRECT DETAILED
ANSWERS (VERIFIED ANSWERS) |
ALREADY GRADED A+
For any object moving uniformly, velocity = distance/time.
If so, in the Hubble relationship for the expansion of the
universe, V= H 0d, what is the significance of the constant
1/H 0?
Select one:
a. It is the inverse of the velocity that the object would
have at a standard distance of 10 parsecs.
b. It represents the average spacing between objects in
the universe at the present time.
c. It is merely a constant of proportionality, to allow for the
different units of V and d.
d. It represents the time since the expansion began, or the
age of the universe, assuming the expansion has been
uniform. Correct Answer D
The cosmic background radiation left over after the Big
Bang of the universe and pervading all observable space
has an effective blackbody temperature of approximately
Select one:
a. 273 K.
,b. 10 K.
c. 3 K.
d. 0 K. Correct Answer C
The future of the overall universe, in terms of its ultimate
evolution and whether it will expand forever or eventually
contract again, is determined by which of its parameters?
a. the intensity of cosmic microwave background radiation
b. the temperature of the gas within it
c. the present volume of the universe
d. the average density of the matter within it Correct
Answer D
On the basis of recent results from very bright and very
distant type 1a supernovae, what seems to be the
situation in our universe regarding the past and present
motion of clusters of galaxies.
a. We live in a "Flat" universe with an accelerating rate of
expansion
b we live in a closed universe with a decelerating rate of
expansion
c. we live in an open universe witha constant rate of
expansion given by hubbles law
d. we live in a "flat" universe with a deceleraing rate of
expansion Correct Answer A
You can calculate the mass of a galaxy using
a.Stefan-Bozman Law
b. Wein's Law
c. Hubble Law
,d. Kepler's Third Law Correct Answer D
Convert 26,000 ly to AU:
______ X 10^9 AU Correct Answer 1.64
Star S0-2 orbits SGR A at the galactic center with an
orbital period of 15.2 years and a semimajor axis of 980
AU. What is the mass of SGR A?
a. 980^3/15.2^2 = 4.1 x 10^6 Mgal
b. 15.2(980^3) = 11.4 ^9 Mgal
c. 15.2^2/980^3 = 4.1 x 10^6 Mgal
d. 980^2/15.2^3 = 10^6 Mgal Correct Answer A
If a galaxy is receding from earth at 6300 km/second in the
Hubble Flow, what is the distance?
a. 70 Mpc
b. 180 Mpc
c. 90Mpc
d. 6300 Mpc Correct Answer C
A galaxy is found to have a distance of 500 Mpc,
according to Hubble Law, what will it's recessional velocity
be?
_______km/s Correct Answer 35,000
, From Urbana, a star rises exactly due East. When this star
reaches its highest position above the horizon, where will
it be?
a. Directly overhead
b. high in the northern sky
c. high in the eastern sky
d. high in the western sky
e. high in the southern sky Correct Answer E
From Urbana at midnight, you see a star between Polaris
and the horizon. When will this star set?
a. 6 hours later
b. 12 hours later
c. 24 hours later
d. Depends on the time of year because the tilt of the
earth shifts the stars by 23.5 degrees
e. Never Correct Answer E
Mars is moving in retrograde motion. Over the course of
several nights, how will Mars appear to move relative to
the background stars?
a. moves randomly since mars moves differently than the
stars
b. moves east to west
c. moves west to east
d. breaks a move
e. doesn't move at all, since Mars does not move with the
stars Correct Answer B
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