NJIT PHYSICS 203 EARTH IN SPACE ACTUAL EXAM
PAPER 2026 QUESTIONS WITH ANSWERS GRADED A+
● Astronomy. Answer: Scientific study of celestial objects and phenomena beyond Earth's
atmosphere
● Celestial Sphere. Answer: Imaginary sphere surrounding Earth on which stars and objects
appear projected
● Celestial Equator. Answer: Projection of Earth's equator onto the celestial sphere
● Celestial Poles. Answer: Points where Earth's rotational axis extended meets the celestial
sphere
● Right Ascension. Answer: East-west coordinate on the celestial sphere measured in hours
eastward from the vernal equinox
● Declination. Answer: North-south coordinate on the celestial sphere measured in degrees
from the celestial equator
● Ecliptic. Answer: Apparent path of the Sun across the celestial sphere over one year
● Zodiac. Answer: Band of constellations through which the ecliptic passes
● Vernal Equinox. Answer: Point on the celestial sphere where the Sun crosses the celestial
equator heading north
● Autumnal Equinox. Answer: Point where the Sun crosses the celestial equator heading
south around September 22
● Summer Solstice. Answer: Point when the Sun reaches its farthest north declination
around June 21
● Winter Solstice. Answer: Point when the Sun reaches its farthest south declination around
December 21
● Precession. Answer: Slow wobble of Earth's axis completing a cycle in about 26000 years
● Sidereal Day. Answer: Earth's rotation period relative to distant stars about 23 hours 56
minutes
, ● Solar Day. Answer: Earth's rotation period relative to the Sun averaging 24 hours
● Sidereal Year. Answer: Earth's orbital period relative to distant stars about 365.25 days
● Tropical Year. Answer: Earth's orbital period relative to the vernal equinox governing our
calendar
● Synodic Period. Answer: Time for a planet to return to the same position relative to Earth
and the Sun
● Sidereal Period. Answer: Time for a planet to complete one full orbit relative to the stars
● Inferior Planet. Answer: Planet with orbit closer to the Sun than Earth's orbit
● Superior Planet. Answer: Planet with orbit farther from the Sun than Earth's orbit
● Inferior Conjunction. Answer: Position when an inferior planet is between Earth and the
Sun
● Superior Conjunction. Answer: Position when a planet is on the far side of the Sun from
Earth
● Greatest Elongation. Answer: Maximum angular separation of an inferior planet from the
Sun as seen from Earth
● Opposition. Answer: Position when a superior planet is opposite the Sun as seen from
Earth
● Quadrature. Answer: Position when a planet is 90 degrees from the Sun as seen from
Earth
● Geocentric Model. Answer: Historical model placing Earth at the center of the universe
● Heliocentric Model. Answer: Model placing the Sun at the center of the solar system
● Ptolemy. Answer: Greek astronomer who developed the elaborate geocentric model with
epicycles
● Copernicus. Answer: Polish astronomer who proposed the modern heliocentric model in
1543
● Galileo. Answer: Italian astronomer who used telescopes to support the heliocentric model
PAPER 2026 QUESTIONS WITH ANSWERS GRADED A+
● Astronomy. Answer: Scientific study of celestial objects and phenomena beyond Earth's
atmosphere
● Celestial Sphere. Answer: Imaginary sphere surrounding Earth on which stars and objects
appear projected
● Celestial Equator. Answer: Projection of Earth's equator onto the celestial sphere
● Celestial Poles. Answer: Points where Earth's rotational axis extended meets the celestial
sphere
● Right Ascension. Answer: East-west coordinate on the celestial sphere measured in hours
eastward from the vernal equinox
● Declination. Answer: North-south coordinate on the celestial sphere measured in degrees
from the celestial equator
● Ecliptic. Answer: Apparent path of the Sun across the celestial sphere over one year
● Zodiac. Answer: Band of constellations through which the ecliptic passes
● Vernal Equinox. Answer: Point on the celestial sphere where the Sun crosses the celestial
equator heading north
● Autumnal Equinox. Answer: Point where the Sun crosses the celestial equator heading
south around September 22
● Summer Solstice. Answer: Point when the Sun reaches its farthest north declination
around June 21
● Winter Solstice. Answer: Point when the Sun reaches its farthest south declination around
December 21
● Precession. Answer: Slow wobble of Earth's axis completing a cycle in about 26000 years
● Sidereal Day. Answer: Earth's rotation period relative to distant stars about 23 hours 56
minutes
, ● Solar Day. Answer: Earth's rotation period relative to the Sun averaging 24 hours
● Sidereal Year. Answer: Earth's orbital period relative to distant stars about 365.25 days
● Tropical Year. Answer: Earth's orbital period relative to the vernal equinox governing our
calendar
● Synodic Period. Answer: Time for a planet to return to the same position relative to Earth
and the Sun
● Sidereal Period. Answer: Time for a planet to complete one full orbit relative to the stars
● Inferior Planet. Answer: Planet with orbit closer to the Sun than Earth's orbit
● Superior Planet. Answer: Planet with orbit farther from the Sun than Earth's orbit
● Inferior Conjunction. Answer: Position when an inferior planet is between Earth and the
Sun
● Superior Conjunction. Answer: Position when a planet is on the far side of the Sun from
Earth
● Greatest Elongation. Answer: Maximum angular separation of an inferior planet from the
Sun as seen from Earth
● Opposition. Answer: Position when a superior planet is opposite the Sun as seen from
Earth
● Quadrature. Answer: Position when a planet is 90 degrees from the Sun as seen from
Earth
● Geocentric Model. Answer: Historical model placing Earth at the center of the universe
● Heliocentric Model. Answer: Model placing the Sun at the center of the solar system
● Ptolemy. Answer: Greek astronomer who developed the elaborate geocentric model with
epicycles
● Copernicus. Answer: Polish astronomer who proposed the modern heliocentric model in
1543
● Galileo. Answer: Italian astronomer who used telescopes to support the heliocentric model
