Aww…look: a baby planet! This is the youngest known exoplanet—a mere 5 to 10 million years old. It orbits its star every 5 days—a ridiculously short year which puts even Mercury’s 88 day orbit to shame (although, to be fair, the planet is 10 times closer to its star than Mercury is to the sun). The newly discovered world is approximately 500 light years from Earth. Researchers discovered the world with the Kepler space telescope (which continues to disgorge a treasure trove of data, even after its primary mission has ended because of mechanical failure).
The planet is thought to be about the size of Neptune. Since its star, K2-33, is only 10 million years old, the planet is assumed to be younger than that…though who knows. The strange nature of this system may cause scientists to rethink and refine their models of planetary formation. It isn’t the sort of thing they expected (though these super-hot giant planets right next to their stars seem to be more common than anyone would have guessed).