Black Knight is an impossibly black exoplanet, a planet closer to its star than Mercury is to ours and blacker than coal. Today, it passes in front of its sun, and you can watch the transit with astronomers using the world’s largest infrared telescope.
TrES-2b is a Jupiter-sized planet located about 750 light-years from Earth. It reflects just 1% of the sunlight that reaches it, making it essentially one vast black sphere. In fact, it's darker than just about any substance found on Earth. We've never observed anything remotely like this before.