Okay, so why are we talking about this now? Why won't we talk about space junk decades ago? Yeah, and look, I think this is a good question is, people have worried about space junk decades ago, but really we're starting to see the massive impacts of it and it becoming a worldwide problem because essentially, we are launching a lot of stuff and we're launching at a rate that we just have never seen before. In fact, so if you look here, this is the number of rocket launches and this is successful and unsuccessful, so back in the 60s and 70s, even though there look like a lot, a lot of these actually never made into the orbit. And nowadays you can see things like, well, some of these numbers are really starting to tick up, so China is really launching it. China launches the most rockets, in fact, of anyone. The US and private companies, Russia still launches all these groups. So there's actually lots of things being launched into space. And this is actually one of the points. It's not just the satellite, the rocket goes up with it. All of the bits of the rocket go with it. All of the things that may fall off the rocket go with it. So it's the sheer volume of things going into orbit. Yeah, so for a long time, the bulk of the rocket, all these Russian Soviet ones, and the problem here was basically that the Soviet spy satellites and electronics got fried by the radiation in space, so they needed to launch a new one, every time they looked at something. Exactly. So the Americans would launch a few of them, which then set up there for 10 years, Russians would launch one that lasted two weeks. But in many ways, it's an advantage for the Russians because they could build them faster. Oh, we have a crisis in the Middle East. Let's launch five rockets to go and look at that. But as the Americans, the rocket might be in the wrong place. Yep. In fact, most of the satellites you see at night, when you look up, are dots are often disused, bits like boosters or Russian spy satellites that were launched back in the 1980s or something, and have been up there ever since. But now it's climbing again. We've not seen all the SpaceX constellations. That's right. This is now not going up. There is a lot. And when we start to then look at how many of these are successful, we can see again. Yeah, in the 60s and 70s, there's quite a few failures. So they never quite made it or they didn't fully work nowadays. So this is, as of March 2022, the blue is the predicted plan. You can really see we're really starting to go up at a fast rate. And as we talked about before, it's not just one satellite for rockets. Some of these rockets can take 10, 50. I think the record is 140 satellites on one launch. It's now lots of things per rocket, suppose it down here. It generally was one satellite per one rocket. So when we start then thinking about the volume of objects in space, so this is now, we've made it into space. What are the satellites that are here? And we're looking at, again, this low-earth orbit, some about 200 kilometers to almost 2,000 kilometers. The red ones are the small ones. And we're doing a lot of small satellites now, the green. Yeah, that's presumably a cause of the advanced electronics you can now build a satellite. Exactly. As we'll talk about later, that's the speed. And how to do something you switch was not possible in 1970. That's right. So there's an advantage of it, but you still have that in space. You still have more small satellites in space. And of course, you've been hit by one of these sort of speeds. If it's the size of the brick or the size of the bus, you're still dead either way. Exactly. Either way, it's a catastrophe. So even though we still have, as you said, some of these really big ones that were quite popular back in the 70s and 80s and 90s, the small ones, which, again, as you see, we are talking about three to five times more per year than previously combined. So the reason we worry about it nowadays is that as we see the growth of everything, it's happening at a rate that worries people. We're not, again, just talking about the satellites themselves, the orange or the rockets. There's now all of this other bits, as we're going to start talking about now, the debris that comes with it. That is essentially an alarming rate. And I don't like to use that word lightly, but it really is, right, Paul? So this is kind of why we worry about it now is, yes, there's lots of satellites. They do great things as we've covered lots of parts of this course. But we are now sending so many of them so fast that it is really a part of the time that we've never compared to. And there's no sign of slowing down.