It's 2M1207b.
This gigantic planet (with about four times the mass of Jupiter) lies 170 light-years from Earth, and its distinctive atmosphere is hellish. Temperatures can reach 1400 degrees Celsius, and its rotation speed is astonishing (it completes one rotation in 10 hours compared to Earth's 24 hours, which is remarkable considering it's about 4000 times the size of Earth). And in the planet's stratosphere, highly sophisticated chemical reactions occur, causing glass droplets to rain down on its surface, so sometimes the rain contains not only glass but also molten iron and other materials.