Alpha Centauri is the star nearest to the sun, and it has a parallax angle of 0.751 second. How far is Alpha Centauri from the sun? Note: Parallax is used not only to measure stellar distances. Our...

Alpha Centauri is the star nearest to the sun, and it has a parallax angle of 0.751 second. How far is Alpha Centauri from the sun? Note: Parallax is used not only to measure stellar distances. Our binocular vision actually provides the brain with a parallax angle that it uses to estimate distances to objects we see.

Sound pressure and decibels: Sound exerts a pressure P on the human ear.