1|Page
ASTR FINAL EXAM LATEST 2025/2026 ACTUAL EXAM WITH
COMPLETE QUESTIONS AND CORRECT DETAILED ANSWERS (100%
VERIFIED ANSWERS) |ALREADY GRADED A+| ||PROFESSOR
VERIFIED|| ||BRANDNEW!!!||
According to what we now know from Newton's laws, which of the
following best explains why Kepler's second law is true?
A) Gravity is an inverse cube law.
B) Orbits must be elliptical in shape.
C) A planet's angular momentum must be conserved as it moves
around its orbit.
D) This effect happens because of the influence of other planets
on a particular planet's orbit. - ANSWER-C) A planet's angular
momentum must be conserved as it moves around its orbit.
Currently, the largest optical telescope mirrors have a diameter of
A) 100 m.
B) 10 m.
C) 2 m.
D) 5 m. - ANSWER-B) 10 m.
,2|Page
What do we mean by the diffraction limit of a telescope?
A) It is the best angular resolution the telescope could achieve
with perfect optical quality and in the absence of atmospheric
distortion.
B) It is the maximum size to which any telescope can be built.
C) It describes the maximum exposure time for images captured
with the telescope.
D) It describes the farthest distance to which the telescope can
see. - ANSWER-A) It is the best angular resolution the telescope
could achieve with perfect optical quality and in the absence of
atmospheric distortion.
Which of the following is not a characteristic of the inner planets?
A) Their orbits are relatively closely spaced.
B) They are relatively smaller than the outer planets.
C) They all have substantial atmospheres.
D) They have very few, if any, satellites.
E) They all have solid, rocky surfaces. - ANSWER-C) They all
have substantial atmospheres.
,3|Page
Which planet has the highest average surface temperature, and
why?
A) Mercury, because it is closest to the Sun
B) Jupiter, because it is so big
C) Mars, because of its red color
D) Mercury, because of its dense carbon dioxide atmosphere
E) Venus, because of its dense carbon dioxide atmosphere -
ANSWER-E) Venus, because of its dense carbon dioxide
atmosphere
Which of the following statements is not an observed pattern of
motion in our solar system?
A) Most planetary orbits lie nearly in the same plane.
B) Most planets rotate in the same direction in which they orbit.
C) Almost all moons orbit their planet in the same direction as the
planet's rotation.
D) All planets orbit the Sun in the same direction.
E) Most planets orbit at the same speed. - ANSWER-E) Most
planets orbit at the same speed.
, 4|Page
The planet closest in size to Earth is
A) Mercury.
B) Pluto.
C) Venus.
D) the Moon. - ANSWER-C) Venus.
Which of the following is not an exception to the general patterns
in the solar system?
A) the large size of Earth's Moon
B) the counterclockwise rotation of Venus
C) the rings of Saturn
D) the retrograde rotation of Triton around Neptune
E) the extreme axis tilt of Uranus - ANSWER-C) the rings of
Saturn
Which of the following scenarios correctly demonstrates the
transformation of mass into energy as given by Einstein's
equation, E = mc2?
ASTR FINAL EXAM LATEST 2025/2026 ACTUAL EXAM WITH
COMPLETE QUESTIONS AND CORRECT DETAILED ANSWERS (100%
VERIFIED ANSWERS) |ALREADY GRADED A+| ||PROFESSOR
VERIFIED|| ||BRANDNEW!!!||
According to what we now know from Newton's laws, which of the
following best explains why Kepler's second law is true?
A) Gravity is an inverse cube law.
B) Orbits must be elliptical in shape.
C) A planet's angular momentum must be conserved as it moves
around its orbit.
D) This effect happens because of the influence of other planets
on a particular planet's orbit. - ANSWER-C) A planet's angular
momentum must be conserved as it moves around its orbit.
Currently, the largest optical telescope mirrors have a diameter of
A) 100 m.
B) 10 m.
C) 2 m.
D) 5 m. - ANSWER-B) 10 m.
,2|Page
What do we mean by the diffraction limit of a telescope?
A) It is the best angular resolution the telescope could achieve
with perfect optical quality and in the absence of atmospheric
distortion.
B) It is the maximum size to which any telescope can be built.
C) It describes the maximum exposure time for images captured
with the telescope.
D) It describes the farthest distance to which the telescope can
see. - ANSWER-A) It is the best angular resolution the telescope
could achieve with perfect optical quality and in the absence of
atmospheric distortion.
Which of the following is not a characteristic of the inner planets?
A) Their orbits are relatively closely spaced.
B) They are relatively smaller than the outer planets.
C) They all have substantial atmospheres.
D) They have very few, if any, satellites.
E) They all have solid, rocky surfaces. - ANSWER-C) They all
have substantial atmospheres.
,3|Page
Which planet has the highest average surface temperature, and
why?
A) Mercury, because it is closest to the Sun
B) Jupiter, because it is so big
C) Mars, because of its red color
D) Mercury, because of its dense carbon dioxide atmosphere
E) Venus, because of its dense carbon dioxide atmosphere -
ANSWER-E) Venus, because of its dense carbon dioxide
atmosphere
Which of the following statements is not an observed pattern of
motion in our solar system?
A) Most planetary orbits lie nearly in the same plane.
B) Most planets rotate in the same direction in which they orbit.
C) Almost all moons orbit their planet in the same direction as the
planet's rotation.
D) All planets orbit the Sun in the same direction.
E) Most planets orbit at the same speed. - ANSWER-E) Most
planets orbit at the same speed.
, 4|Page
The planet closest in size to Earth is
A) Mercury.
B) Pluto.
C) Venus.
D) the Moon. - ANSWER-C) Venus.
Which of the following is not an exception to the general patterns
in the solar system?
A) the large size of Earth's Moon
B) the counterclockwise rotation of Venus
C) the rings of Saturn
D) the retrograde rotation of Triton around Neptune
E) the extreme axis tilt of Uranus - ANSWER-C) the rings of
Saturn
Which of the following scenarios correctly demonstrates the
transformation of mass into energy as given by Einstein's
equation, E = mc2?
