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When you can find a whole bunch very quickly, which is what we can do now with the Australian Square Kilometre Array Pathfinder, we'll be able to get a nice uniform set that we can start to do some statistics with.

So a classic thing we can do is measure how many really bright ones there are versus how many faint ones. And that tells us whether the things that we're looking at come from fairly nearby or really far away in the universe, much further than we might even think.

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