Shamrock Rover
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Seriously, the event horizon is almost the main thing in the theory, it can't be ignored, so it's impossible without black holes.
I'm not sure if it's impossible, there are different theories. But you might be right. By the way, we have one resident of the event horizon...)
And now, back to the topic, Ar won't search for articles for you, you might as well cite Nature... No, here we rely on Wikipedia...
I don't know why the article I provided is worse than the Wikipedia one. It's easily found on Google and is published on a fairly popular website. In the end, why shouldn't Ar search for articles? :confused: