Part 5/11:
In the pursuit of quantum gravity, several constants emerge that are pivotal: the speed of light (c), the gravitational constant (G), and the newly acknowledged Planck constant (h or h-bar). By combining these constants, scientists derive the Planck units that serve as benchmarks depicting where quantum mechanics intertwines with general relativity.
One fundamental aspect of this merger is the Planck length (1.6 x 10^-35 m) and the Planck energy (2 billion Joules). As quantum mechanics advances, producing insights at smaller distances necessitates higher energies, introducing collisions with general relativity in extreme conditions—like the emergence of black holes.