Question

Which of the following statements about dark matter and dark energy is/are true?

Choose one or more:
A. Both exceed the matter-energy equivalent of luminous matter.
B. Dark matter has only an attractive gravitational effect, while dark energy is repulsive.
C. While the nature of dark matter has been determined, the nature of dark energy has no

Answer 1

Dark matter and dark energy are both intriguing and poorly understood components of the universe. Dark matter outweighs all known stars and galaxies and exerts attractive gravitational effects, while dark energy pushes spacetime apart and causes the universe's expansion to accelerate. The nature of dark matter has been partially determined, while the nature of dark energy remains a mystery.

Step-by-step explanation:

According to current scientific understanding, the following statements about dark matter and dark energy are true:

1. A. Both exceed the matter-energy equivalent of luminous matter. Dark matter is a substance that exerts gravitational effects but does not emit or absorb light. It outweighs all the known stars and galaxies in the universe. Dark energy, on the other hand, is a mysterious energy that pushes spacetime apart, causing the acceleration of the universe's expansion.
2. B. Dark matter has only an attractive gravitational effect, while dark energy is repulsive. Dark matter exerts attractive gravitational effects, influencing the motion of stars and galaxies. Dark energy, however, has a repulsive effect, causing the expansion of the universe to accelerate.
3. C. While the nature of dark matter has been determined, the nature of dark energy remains a mystery today. Scientists have made progress in understanding the nature of dark matter but are still uncertain about its exact composition. Dark energy, on the other hand, is even less understood, and its properties remain a mystery.