Astronomers spot an exoplanet so hot it has iron and titanium in its atmosphere

When it comes to heat in our Solar System, Mercury takes the top crown, at least as far as planets are concerned. You wouldn't last more than a few seconds on Mercury's surface, with temperatures topping 800 degrees Fahrenheit on the Sun-facing side of the planet, but believe it or not that's downright chilly compared to the distant exoplanet KELT-9b. KELT-9b is located around 650 light years from our Solar System, and it's orbiting its start -- named KELT-9 -- at such a short distance that it m...