00:01
So if we're using visible wavelengths of light, so we're the observer, which is represented by the eyeball, and we're looking at a distant galaxy.
00:07
So it looks like this little spiral galaxy over here on the right, but there's something in the way.
00:12
So we see a dark line cutting through the bright disk.
00:16
Well, most of what we see when we're looking out is inside the milky way galaxy.
00:22
This is because we're in the milky way galaxy, and these are all the closer objects.
00:26
So the probability is that this dust cloud is in the milky way galaxy and it's blocking our view from something in the distance.
00:34
So that's why this object that's over here on the right is getting blocked by this dust cloud here in the middle.
00:39
So light goes through and it hits this dust cloud...