4. Λ as Dark Energy
Today, the cosmological constant (Λ) is at the heart of dark energy research.
Scientists believe that Λ could represent the energy inherent to empty space, which exerts a repulsive force and drives the universe’s accelerated expansion.
According to NASA, this mysterious force now accounts for nearly 70% of the universe’s total energy.
What Einstein once dismissed now stands as a cornerstone in our quest to understand why galaxies are being pushed ever farther apart.