#99: The legendary New Scientist end-of-year holiday party and quiz
The World, the Universe and Us
00:00
We Can't See a Shepherd Dog Planet
We can't see a shepherd dog planet that's may be five or 15 times the size of earth, out there beyond neptune and the tipe about. The alternative explanation for wy we can't see this source of mass in the outer solar system is because it is a small black hole left over from the big bag. And er physicists have calculated, because that's what physicists do, that it would need to be about the size of a grape fruit,. which would provide a useful explanation for why our current telescopes haven't been able to see it.
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