Dark matter is a type of matter that doesn’t interact with light or other forms of electromagnetic radiation. So far, scientists have only been able to detect its existence through its gravitational effects on other objects in space. It’s estimated to make up about 85% of the matter in the universe, and its exact properties and composition are still not well understood.

Dark energy is an unknown form of energy that’s causing the expansion of the universe to accelerate. It’s estimated to make up about 68% of the total energy in the universe. Scientists believe it may be related to the concept of vacuum energy, which suggests that even empty space contains energy and can exert a gravitational force. However, the nature and properties of dark energy remain one of the biggest mysteries in modern physics.