Hello astronomers Jeff Matthews coming at you again here and today we're going to be taking a look at ultraviolet light so One of these cameras that I have running right now is collecting visible So you're seeing me as you normally would so blue green you know red light I appear like this, but with the other camera for taking pictures of me in a ultraviolet light So you might notice a few differences in ultraviolet. I'm wearing shades There are a few other things so you might see that in the ultraviolet light there the This black and white picture the black is showing whether there's not much ultraviolet light From the sun hitting me reflecting to the camera places that are light are places where lots of ultraviolet light is hitting me reflecting off and going to the camera Now you might have heard the importance of sunblock for absorbing ultraviolet light ultraviolet light photons Each one of those particles packs enough punch break apart DNA molecules and so that can leave just some problems if they go back together And correctly giving a copy command So we'll see here that I've got a stick of sunblock So let's see how this looks when I just Apply that across my forehead So go ahead that way so what we see happening there is that this sunblock that you're not really seeing invisible light because it's Transparent to blue and green and red to the colors that our eyes can see it's not transparent to you being It's absorbing the ultraviolet light. So whereas before you saw some UV hitting my forehead Now that UV is hitting my forehead where I've got the sunblock and it's absorbing it all so now my forehead looks dark You can also see how My glasses are completely absorbing ultraviolet light. They look nice and dark here. So if I hold them over The the camera there you can't see a thing Well, let me go back to what's comfortable for me out on this sunny day Where I have my shades absorbing visible light making things a little bit more comfortable for myself so Thank you very much