![\"\"](\"https:\/\/explorism.blog\/blogs\/wp-content\/uploads\/2026\/05\/WASP-12_b.jpg\")
WASP-12b is being consumed. It has perhaps three million years left \u2014 which sounds like a long time until you remember that the universe is 13.8 billion years old. In cosmic terms, we arrived just in time to watch a planet die.<\/p>\n\n\n\n
What makes it impossible is not that it’s being destroyed. It’s that it exists at all. At that distance, the tidal forces should have torn the planet apart before it ever consolidated. The leading theory is that it formed further out and migrated inward \u2014 a process planetary science allows for, but not quite so dramatically, and not quite so close. WASP-12b sits at the edge of what the models permit, and perhaps slightly beyond.<\/p>\n\n\n\n
The Planet That Orbits the Wrong Way<\/h2>\n\n\n\n
Most planets in any solar system orbit their star in the same direction the star rotates. This is not a coincidence \u2014 it is a consequence of how solar systems form from a rotating disc of gas and dust. Conservation of angular momentum means everything ends up spinning and orbiting in broadly the same direction.<\/p>\n\n\n\n
WASP-17b does not.<\/p>\n\n\n\n It orbits its star in retrograde \u2014 the opposite direction to the star’s rotation. Not slightly offset. Backwards. When it was confirmed in 2009, it was the first exoplanet ever found with a confirmed retrograde orbit, and it immediately invalidated several tidy assumptions about how gas giants end up where they are.<\/p>\n\n\n\n The leading explanation involves gravitational interactions \u2014 possibly with another planet, or a passing stellar companion \u2014 that flipped the orbit early in the system’s history. But the mechanics required are extreme, and the probability of ending up in a stable retrograde orbit rather than simply being ejected from the system entirely is low enough that WASP-17b’s existence remains genuinely surprising. It is one of several impossible planets that exist in direct defiance of the angular momentum rules that govern almost every solar system we have ever studied.<\/p>\n\n\n\n The James Webb Space Telescope<\/a> has since taken detailed readings of WASP-17b’s atmosphere \u2014 finding quartz crystals suspended in clouds at temperatures above 1,500 degrees. A planet that shouldn’t exist, raining glass in the wrong direction around the wrong kind of orbit.<\/p>\n\n\n\n PSR B1257+12 is a pulsar \u2014 the spinning remnant of a dead star, a neutron star rotating hundreds of times per second, blasting the surrounding space with radiation intense enough to strip electrons from atoms at considerable distances.<\/p>\n\n\n\n It has planets.<\/p>\n\n\n\n Three of them. Confirmed in 1992, they were the first exoplanets ever discovered. And they represent perhaps the most philosophically disturbing category of impossible planets that exist \u2014 not because of their physical properties, but because of what their existence implies.<\/p>\n\n\n\n Pulsars form from supernova explosions. Any planets that existed before the explosion would have been vaporised or violently ejected. These planets formed after the explosion \u2014 coalescing from the debris disc of a dead star, in an environment bathed in lethal radiation, around an object that should provide no stable conditions for planetary formation whatsoever.<\/p>\n\n\n\n They formed anyway.<\/p>\n\n\n\n This tells us something important \u2014 and unsettling. Planet formation is apparently so robust, so fundamental a process, that it happens even in the most hostile environments the universe produces. Even in the first chaotic moments after stellar death<\/a>, matter wants to clump. Gravity does not care about the conditions. It just pulls.<\/p>\n\n\n\n 55 Cancri e is a super-Earth \u2014 roughly twice the diameter of our planet, orbiting its star in just 18 hours. Early models of its composition, based on its mass and density, suggested it could be largely composed of carbon in a high-pressure crystalline form.<\/p>\n\n\n\n Diamond. A planet potentially made of diamond, roughly 40 light-years away.<\/p>\n\n\n\n The diamond-planet hypothesis has since been complicated by more detailed atmospheric readings \u2014 the composition is now thought to be more mixed, possibly with a lava ocean on its surface and a carbon-rich mantle beneath. But the core possibility has not been ruled out, and 55 Cancri e remains one of the most extreme examples of how planetary conditions can produce environments<\/a> that have no analogue anywhere in our solar system.<\/p>\n\n\n\n The universe does not restrict itself to the materials and conditions familiar to Earth. It builds with whatever physics allows, in whatever configurations gravity and pressure produce \u2014 including, apparently, worlds that would be worth more than the entire global economy.<\/p>\n\n\n\n The deeper significance of impossible planets that exist is not the spectacle. It is the epistemological warning \u2014 a reminder that every model is only as good as the data that built it.<\/p>\n\n\n\n Every time astronomers find a planet that the models said couldn’t form, or couldn’t survive, or couldn’t orbit the way it does, the models get revised. That is how science works. But the sheer frequency of rule-breaking exoplanets discovered since 1995 \u2014 when the first planet around a sun-like star was confirmed \u2014 has forced a much more fundamental rethink. The assumption that our solar system was typical turns out to have been remarkably parochial. The Fermi Paradox<\/a> gets stranger still when you realise that most solar systems look nothing like ours.<\/p>\n\n\n\n![\"\"](\"https:\/\/explorism.blog\/blogs\/wp-content\/uploads\/2026\/05\/WASP-17b.jpg\")
The Planet That Is Older Than the Elements It Needs<\/h2>\n\n\n\n
![\"\"](\"https:\/\/explorism.blog\/blogs\/wp-content\/uploads\/2026\/05\/PSR_B125712_B.jpg\")
The Planet Made of Diamond<\/h2>\n\n\n\n
![\"\"](\"https:\/\/explorism.blog\/blogs\/wp-content\/uploads\/2026\/05\/Artists_impression_of_55_Cancri_e-1-1024x696.jpg\")
What They Tell Us About Everything Else<\/h2>\n\n\n\n