Chapter 34, Problem 5TC

Rank the following in order of increasing abundance: dark energy, ordinary matter, dark matter.

To determine

The increasing order of abundance of dark energy, ordinary matter and dark matter in the Universe.

Answer to Problem 5TC

The increasing order of abundance in the universe is, Ordinary matter < dark matter < dark energy.

Explanation of Solution

The ordinary matter includes atoms, stars, planets and life in the universe. Only $5\%$ of the universe is visible, rest of it is made of unknown and invisible matter, this unknown and undefined form of matter is known as dark matter. And the force that repels gravity is known as dark energy.

Dark energy is the greatest abundance present in the universe. The most abundance in the universe is dark energy and the least abundance is ordinary matter.

Conclusion:

Therefore, the increasing order of abundance in the universe is, Ordinary matter < dark matter < dark energy.