Front

What is a galaxy?

Back

A system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.

Front

What does the Big Bang Theory explain?

Back

How our universe began.

Front

What two factors affect the strength of gravity?

Back

Mass and Distance.

Front

What is the term for all existing matter and space considered as a whole?

Back

Universe.

Front

Which galaxy is Earth and its solar system a part of?

Back

Milky Way.

Front

What is the primary force that holds galaxies together?

Back

Gravitational attraction.

Front

What is the difference between a star and a galaxy?

Back

A star is a luminous celestial body, while a galaxy is a collection of stars, gas, and dust.

Front

What is dark matter and its significance in galaxies?

Back

Dark matter is a form of matter that does not emit light or energy, and it is believed to make up a significant portion of the mass in galaxies, affecting their formation and motion.

Front

What is the role of gravity in the formation of galaxies?

Back

Gravity pulls together gas and dust to form stars and galaxies.

Front

What is the observable universe?

Back

The part of the universe that can be seen from Earth, limited by the speed of light and the age of the universe.