Here's why:

* Dimness: Proxima Centauri is a red dwarf star, which are much fainter than our sun. It's about 1/7th the mass of the sun and emits only about 1/6000th of its light.

* Distance: Proxima Centauri is the closest star to our sun, but it's still incredibly far away – roughly 4.24 light-years. This distance makes it too faint to be visible without a telescope.

You need a powerful telescope to see Proxima Centauri. Even with telescopes, it's a challenging observation due to its faintness and location close to the bright star Alpha Centauri A.