A gravitationally bound system consisting of a star (the Sun) and the objects that orbit it, including planets, moons, asteroids, and comets.

A large celestial body that orbits a star, is spherical (or nearly so) due to its own gravity, and has cleared the neighborhood around its orbit.

A massive, luminous sphere of plasma held together by its own gravity, which generates energy through nuclear fusion in its core.

A massive system of stars, stellar remnants, interstellar gas, dust, and dark matter, all bound together by gravity.

A unit of distance representing the distance that light travels in a vacuum in one Julian year (approximately 9.46 trillion kilometers)

The totality of all space, time, matter, and energy, including all galaxies, stars, and planets.

A measure of how bright a celestial object appears to an observer on Earth. Smaller or more negative numbers indicate brighter objects.

The total amount of energy (light) emitted by a star, galaxy, or other celestial object per unit of time.

A measure of the intrinsic brightness of a celestial object, defined as the apparent magnitude it would have if it were located at a standard distance of 10 parsecs.

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unit 2

vocab space

Question	Answer
solar system	A gravitationally bound system consisting of a star (the Sun) and the objects that orbit it, including planets, moons, asteroids, and comets.
planet	A large celestial body that orbits a star, is spherical (or nearly so) due to its own gravity, and has cleared the neighborhood around its orbit.
star	A massive, luminous sphere of plasma held together by its own gravity, which generates energy through nuclear fusion in its core.
galaxy	A massive system of stars, stellar remnants, interstellar gas, dust, and dark matter, all bound together by gravity.
light year	A unit of distance representing the distance that light travels in a vacuum in one Julian year (approximately 9.46 trillion kilometers)
universe	The totality of all space, time, matter, and energy, including all galaxies, stars, and planets.
apparent magnitude	A measure of how bright a celestial object appears to an observer on Earth. Smaller or more negative numbers indicate brighter objects.
luminosity	The total amount of energy (light) emitted by a star, galaxy, or other celestial object per unit of time.
absolute magnitude	A measure of the intrinsic brightness of a celestial object, defined as the apparent magnitude it would have if it were located at a standard distance of 10 parsecs.

Created by: Javier velez

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