Galaxies and the Universe

Front

What is a galaxy?

Back

A galaxy is a huge collection of stars, gas, dust, and dark matter bound together by gravity.

Front

What type of galaxy is the Milky Way?

Back

The Milky Way is a spiral galaxy.

Front

What force holds galaxies together?

Back

Gravity holds galaxies together.

Front

What percentage of the universe's mass is dark matter?

Back

About 90% of the universe's mass is dark matter.

Front

What does the Big Bang theory state?

Back

The Big Bang theory states that the universe began expanding out of an enormous explosion between 15 and 20 billion years ago.

Front

What are the main components of a galaxy?

Back

The main components of a galaxy include stars, planets, gas, dust, and dark matter.

Front

What is dark matter?

Back

Dark matter is a type of matter that does not emit light or energy, making it invisible and detectable only through its gravitational effects.

Front

What is the difference between a solar system and a galaxy?

Back

A solar system is a collection of planets and other celestial bodies orbiting a star, while a galaxy is a vast collection of many solar systems, stars, and other matter.

Front

What is the observable universe?

Back

The observable universe is the part of the universe that we can see and measure, limited by the speed of light and the age of the universe.

Front

What is the role of gravity in the universe?

Back

Gravity is the force that attracts objects with mass towards each other, playing a crucial role in the formation and structure of galaxies.