What Is Dark Matter?

The video explores the composition of the universe, focusing on dark matter and dark energy. It explains how dark matter, which makes up 27% of the universe, interacts with gravity but not light, making it difficult to detect. The concept of Einstein rings is introduced to illustrate dark matter's effect on light. Various theories about dark matter, including WIMPs and parallel universes, are discussed. The video also touches on dark energy, which constitutes 68% of the universe, and its enigmatic properties.

What percentage of the universe is made up of ordinary matter?

• Exactly 50%

• Less than 5%

• About 27%

• Approximately 68%

What is the only force that dark matter is known to interact with?

• Weak nuclear force

• Gravity

• Strong nuclear force

• Electromagnetic force

Who was the astronomer that studied the rotation of spiral galaxies, leading to evidence of dark matter?

• Carl Sagan

• Vera Rubin

• Albert Einstein

• Isaac Newton

What is an Einstein ring?

• A theory about dark energy

• A type of galaxy

• A phenomenon where light is bent by gravity

• A new particle discovered in space

What is the most popular theory about the composition of dark matter?

• It is a type of black hole

• It is a form of dark energy

• It consists of weakly interacting massive particles

• It is made of ordinary matter

What are MACHOs in the context of dark matter?

• A parallel universe

• A new form of energy

• A type of galaxy

• Massive astrophysical compact halo objects

What is one theory about the origin of dark energy?

• It comes from the energy of empty space

• It is a form of dark matter

• It is a type of black hole

• It is a new type of galaxy