is a gravitationally bound system consisting of the Sun and all objects that orbit it, including planets, moons, dwarf planets, asteroids, comets, and interplanetary dust.

a celestial body that orbits a star, is spherical due to its own gravity, and has cleared its orbital neighborhood of other debris.

a massive, luminous sphere of hot gas held together by gravity that generates energy through nuclear fusion in its core.

is any of the systems of stars and interstellar matter that make up the universe.

is a unit of distance that represents how far light travels in a vacuum in one Julian year, approximately 9.46 trillion kilometers (5.88 trillion miles).

all existing matter and space considered as a whole; the cosmos. The universe is believed to be at least 10 billion

is a measure of how bright a celestial object appears from Earth, influenced by its intrinsic brightness, distance, and any intervening material.

is the total amount of electromagnetic energy emitted by an object per unit time, commonly used in astronomy to describe the brightness of stars and other celestial bodies.

is a measure of the intrinsic brightness of a celestial object, defined as the apparent magnitude it would have if located at a standard distance of 10 parsecs (32.6 light-years) from Earth.

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UNIT 2

Question	Answer
solar system	is a gravitationally bound system consisting of the Sun and all objects that orbit it, including planets, moons, dwarf planets, asteroids, comets, and interplanetary dust.
planet	a celestial body that orbits a star, is spherical due to its own gravity, and has cleared its orbital neighborhood of other debris.
star	a massive, luminous sphere of hot gas held together by gravity that generates energy through nuclear fusion in its core.
galaxy	is any of the systems of stars and interstellar matter that make up the universe.
light-year	is a unit of distance that represents how far light travels in a vacuum in one Julian year, approximately 9.46 trillion kilometers (5.88 trillion miles).
universe	all existing matter and space considered as a whole; the cosmos. The universe is believed to be at least 10 billion
apparent magnitude	is a measure of how bright a celestial object appears from Earth, influenced by its intrinsic brightness, distance, and any intervening material.
luminosity	is the total amount of electromagnetic energy emitted by an object per unit time, commonly used in astronomy to describe the brightness of stars and other celestial bodies.
absolute magnitude	is a measure of the intrinsic brightness of a celestial object, defined as the apparent magnitude it would have if located at a standard distance of 10 parsecs (32.6 light-years) from Earth.

Created by: Allanhernandez

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