NASA’s asteroid collision: how many asteroids are really out there?
More or Less: Behind the Stats
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Are Drilling Contractors Really Faster to Train a Driller to Be an Astronaut?
We don't really have precise numbers on this, but we've got really good estimates based on how many we've seen already. What we're doing at the moment is actually building a bigger telescope that allows us to see these much smaller objects. So they come in and out of our neighbourhood, and some of them will be sort of making their journey in. Weu just haven't seen them yet. But you know, this number, it's got a huge error on it.
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