In astrophysics, two of the greatest mysteries are dark matter and dark energy. Even though we are unable to directly see or measure them, they together make up almost 95% of the universe. Despite not being able to emit or absorb light, dark matter is assumed to exist because of its gravitational pull on galaxies and galaxy clusters. 

Despite their great speeds, it keeps galaxies from colliding by holding them together. In contrast, it is thought that dark energy is the cause of the universe's accelerating expansion. In a sense, it exerts a type of "anti-gravity," rapidly driving galaxies apart. Researchers are currently working to determine the exact nature of these invisible forces.

 If their secrets are discovered, our perception of the world and its ultimate destiny may be drastically altered. Despite this, dark matter and dark energy remain elusive, driving intense research.