The false-colored image in radio wavelengths shows a proto-planetary disk, which contains the unseen protoplanets. The yellow bar gives a sense of length in units of AU where 1 AU is the average distance between the Earth and the Sun.

https://apod.nasa.gov/apod/ap130919.html

Author: Hayley Rice, UCF Undergraduate 2017
Editor: Patrick Joiner, UCF Interdisciplinary Studies, Class of 2018
Senior Editor: M.M. Montgomery, Ph.D, UCF Physics