distinguish between 1 au and 1 angstrom Share with your friends Share 0 Akshit Bhalla answered this 1AU is 1 Astronomical Unit = 149597871 kilometers.1 angstrom is 1.0 × 10-10 meters. 2 View Full Answer Abhilasha Kumari answered this AU ar astronomical unit is a very LARGE unit of length defined as the mean distance b/w Sun and Earth wherear 1 angstrom is just 10-10 of a metre. 2