Unit 2 Review - The Universe

Front

What is RED shift?

Back

RED shift is the phenomenon where light from an object moving away from an observer shifts towards the red end of the electromagnetic spectrum, indicating that the universe is expanding.

Front

What galaxy is our solar system located in?

Back

The Milky Way.

Front

How do the characteristics of a hotter star compare to a cooler star?

Back

A hotter star is generally brighter than a cooler star.

Front

What holds galaxies together?

Back

Galaxies are held together by gravitational attraction.

Front

What does a red shift in a star's light indicate?

Back

It indicates that the star is moving away from the Earth.

Front

What is the main evidence for the expanding universe?

Back

The main evidence is the observation of RED shift in light from distant galaxies.

Front

What is a galaxy?

Back

A galaxy is a massive system that consists of stars, stellar remnants, interstellar gas, dust, and dark matter, bound together by gravity.

Front

What is the difference between a star and a planet?

Back

A star is a luminous celestial body made of plasma that generates its own light, while a planet is a celestial body that orbits a star and does not produce its own light.

Front

What is gravitational attraction?

Back

Gravitational attraction is the force that pulls two masses towards each other, which is responsible for the formation and structure of galaxies.

Front

What is the Local Group?

Back

The Local Group is a collection of over 54 galaxies, including the Milky Way, Andromeda, and others, that are gravitationally bound.