I’m not aware of any country on Earth having set up long-range radar-like technology to track matter as it enters proximity to the planet yet. I’m assuming all our knowledge of space happenings is based on high-tech “telescopes”. That is extremely limited in the Funny Ew People Skull And Moon Shirt. Radar Astronomy is absolutely a thing that exists. That’s what produced some fantastic images and very precise orbital data on Asteroid 99942 Apophis. The problem is that asteroids are very small, and radar power diminishes with the 4th power of distance (inverse-square law both ways). Basically, imagine trying to look at a fly on a wall at the other end of a football field at night with a flashlight.
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So, now, imagine that you don’t know where the fly is, but think it’s somewhere on the side of a barn at the other end of the football field and you no longer have a flashlight. Trying to do a whole-sky survey to find and track asteroids using radar would be an absolutely enormous task. Especially since you need repeated observations to get any orbital data (to see if it’s a threat). It’s not an easy problem to solve, a planet-killing asteroid is quite small and moves very fast. It also wouldn’t be relying on a single system to detect them, rather an array of many different high powered radars. Even then, there are many of these asteroids they approach and pass very quickly so its an extremely tough challenge.
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There are several that exist re-listed on a Wikipedia page I put in another comment. But to my knowledge, they are all earth-born due to the need for lots of electricity. I am also not sure many are specifically made to detect asteroids on a Funny Ew People Skull And Moon Shirt. We have blind spots. It is frequently said we need to build more telescopes in the southern hemisphere for exactly this reason. Chances of spotting an object in that direction are too low. Problem is that there’s a lot more ocean in the Southern hemisphere.
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