The human eye can process light wavelengths in the range of 380 to 740 nanometers. However, there’s a whole swath of “light” that we are unable to see. Cue the fancy telescopes! This week we are going to look at photos of space that are filtered for the infrared—wavelengths from 700 nanometers to 1 millimeter in size. By filtering for infrared scientists are able to peer through the visible stuff that gets in the way, like gas and dust and other material, to see heat, and in space there’s a lot of hot stuff. This is why NASA has telescopes like Spitzer that orbit the Earth looking at the universe in infrared, showing us stuff our puny eyes could never see on their own.