Unit 5 Vocab

Front

What is a spiral galaxy?

Back

A type of galaxy characterized by spiral arms.

Front

What is the universe?

Back

A collection of galaxies, stars, and planets.

Front

What does apparent magnitude measure?

Back

How bright a star appears as seen from Earth.

Front

What is an irregular galaxy?

Back

A type of galaxy that lacks a distinct shape or structure.

Front

What constitutes a galaxy?

Back

A massive system that consists of stars, stellar remnants, interstellar gas, dust, and dark matter.

Front

What is the difference between apparent magnitude and absolute magnitude?

Back

Apparent magnitude measures brightness as seen from Earth, while absolute magnitude measures the intrinsic brightness of a celestial object.

Front

What are the main types of galaxies?

Back

Spiral, elliptical, and irregular galaxies.

Front

What is dark matter?

Back

A form of matter that does not emit light or energy, making it invisible and detectable only through its gravitational effects.

Front

What is a star?

Back

A luminous celestial body made of plasma that generates energy through nuclear fusion.

Front

What is a planet?

Back

A celestial body that orbits a star, is spherical in shape, and has cleared its orbit of other debris.