What's the Deal With Dark Matter?

Universe Expansion

The expansion of the universe is a phenomenon that has puzzled scientists for decades. Gary Arndt explains that while it was long assumed the expansion would slow down due to gravity, researchers in 1998 discovered it was actually accelerating. This acceleration suggests the presence of a mysterious force or energy, dubbed dark energy, which remains unexplained.

Not only was the expansion of the universe not slowing down, but it was accelerating. For something to accelerate, there needs to be a force or energy behind it. This mysterious energy has been dubbed dark energy because no one knows what it is.

--- Gary Arndt

Theories about dark energy range from it being an intrinsic part of space to an interaction with dark matter, but none have been conclusively proven 1.

   

Theoretical Models

Various theoretical models have been proposed to explain dark energy and its properties. Gary Arndt mentions that some theories suggest dark energy is an intrinsic part of space, while others propose it interacts with dark matter. There are also ideas that dark energy might be an anti-gravity force or simply a result of poor measurements.

There are theories that this is just an intrinsic part of space. Some hold that this is an interaction with dark matter, or it has something to do with dark matter, thus trying to solve both puzzles at once.

--- Gary Arndt

Despite numerous attempts, the true nature of dark energy remains one of the biggest mysteries in physics 1.