1
ASTR 1220 FINAL EXAM LATEST QUESTIONS WITH
ANSWERS (100% CORRECT ANSWERS)
What is the average distance from Earth to the Sun? Answer: Astronomical Unit (AU)
What is the distance light travels in one year? Answer: Light-Year (ly)
What concept describes the fact that looking at distant objects is like looking back in time?
Answer: Lookback Time
What is a powerful, repeatedly verified explanation for a wide range of observations? Answer:
Scientific Theory
What is the imaginary dome surrounding Earth upon which we map the stars? Answer:
Celestial Sphere
What is the primary cause of Earth's seasons? Answer: The tilt of the Earth's axis (23.5°)
relative to the Ecliptic.
What term describes the slow wobble of Earth's axis? Answer: Precession
Which laws describe the motion of objects in orbit? Answer: Kepler's Laws
Which law states that every mass attracts every other mass? Answer: Newton's Law of
Universal Gravitation
What ancient model placed the Earth at the center of the universe? Answer: Geocentric Model
What model places the Sun at the center of the solar system? Answer: Heliocentric Model
What is the apparent temporary reversal of a planet's movement across the sky? Answer:
Retrograde Motion
What type of radiation travels as both a wave and a particle? Answer: Electromagnetic
Radiation (Light)
© 2025 All rights reserved
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What type of spectrum is produced by a hot, low-density gas? Answer: Emission Spectrum
What type of spectrum is produced when cool gas absorbs light from a hot source? Answer:
Absorption Spectrum
Which law states that hotter objects emit their peak thermal radiation at shorter
wavelengths? Answer: Wien's Law
What effect shifts light toward shorter wavelengths when an object is moving toward the
observer? Answer: Blueshift (a result of the Doppler Effect)
Which property of a telescope determines how faint an object it can detect? Answer: Light-
Collecting Area
What property determines the smallest angle a telescope can distinguish? Answer: Angular
Resolution
What technique is used on ground-based telescopes to compensate for atmospheric blurring?
Answer: Adaptive Optics
What process in the Sun's core converts hydrogen to helium? Answer: Nuclear Fusion
(specifically, the Proton-Proton Chain)
What is the state of balance in the Sun called? Answer: Hydrostatic Equilibrium
What is the total power that a star emits into space? Answer: Luminosity
What is the small angular shift in a star's apparent position used to measure distance?
Answer: Stellar Parallax
What is the name for the large, cool star formed when the Sun exhausts its core hydrogen?
Answer: Red Giant
What is the beautiful, expanding shell of gas ejected by a low-mass star? Answer: Planetary
Nebula
What is the dense, hot corpse of a low-mass star? Answer: White Dwarf
© 2025 All rights reserved
ASTR 1220 FINAL EXAM LATEST QUESTIONS WITH
ANSWERS (100% CORRECT ANSWERS)
What is the average distance from Earth to the Sun? Answer: Astronomical Unit (AU)
What is the distance light travels in one year? Answer: Light-Year (ly)
What concept describes the fact that looking at distant objects is like looking back in time?
Answer: Lookback Time
What is a powerful, repeatedly verified explanation for a wide range of observations? Answer:
Scientific Theory
What is the imaginary dome surrounding Earth upon which we map the stars? Answer:
Celestial Sphere
What is the primary cause of Earth's seasons? Answer: The tilt of the Earth's axis (23.5°)
relative to the Ecliptic.
What term describes the slow wobble of Earth's axis? Answer: Precession
Which laws describe the motion of objects in orbit? Answer: Kepler's Laws
Which law states that every mass attracts every other mass? Answer: Newton's Law of
Universal Gravitation
What ancient model placed the Earth at the center of the universe? Answer: Geocentric Model
What model places the Sun at the center of the solar system? Answer: Heliocentric Model
What is the apparent temporary reversal of a planet's movement across the sky? Answer:
Retrograde Motion
What type of radiation travels as both a wave and a particle? Answer: Electromagnetic
Radiation (Light)
© 2025 All rights reserved
, 2
What type of spectrum is produced by a hot, low-density gas? Answer: Emission Spectrum
What type of spectrum is produced when cool gas absorbs light from a hot source? Answer:
Absorption Spectrum
Which law states that hotter objects emit their peak thermal radiation at shorter
wavelengths? Answer: Wien's Law
What effect shifts light toward shorter wavelengths when an object is moving toward the
observer? Answer: Blueshift (a result of the Doppler Effect)
Which property of a telescope determines how faint an object it can detect? Answer: Light-
Collecting Area
What property determines the smallest angle a telescope can distinguish? Answer: Angular
Resolution
What technique is used on ground-based telescopes to compensate for atmospheric blurring?
Answer: Adaptive Optics
What process in the Sun's core converts hydrogen to helium? Answer: Nuclear Fusion
(specifically, the Proton-Proton Chain)
What is the state of balance in the Sun called? Answer: Hydrostatic Equilibrium
What is the total power that a star emits into space? Answer: Luminosity
What is the small angular shift in a star's apparent position used to measure distance?
Answer: Stellar Parallax
What is the name for the large, cool star formed when the Sun exhausts its core hydrogen?
Answer: Red Giant
What is the beautiful, expanding shell of gas ejected by a low-mass star? Answer: Planetary
Nebula
What is the dense, hot corpse of a low-mass star? Answer: White Dwarf
© 2025 All rights reserved
