Like a Diamond in the Sky
Did you feel sad when Pluto got demoted from its status as a planet to a dwarf planet? The debate around that is because the classification is arbitrary: how spherical does an object have to be to be called a planet? How big must be it compared to other objects in orbit at the same distance? Why those values? None of these answers can be derived from the laws of physics, hence the controversy. Ok, but the difference between a planet and a star? Surely, that’s easy, right? A star emits its own light whereas a planet doesn’t. Simple? Even when a star runs out of fuel, we don’t call it a planet. Until we found the “diamond planet”, that is! Huh? Long, long ago, there was this pulsar. Oversimplified, a pulsar is a star that has collapsed and is spinning really fast. Like 170 times a second. As it spins, the pulsar shoots out deadly radiation. How deadly? Suffice to say, it’d make our nukes feel puny by comparison. There was this other star that got too close to this pul...