A team of astrophysicists, including two researchers from ÍÃ×ÓÏÈÉú´«Ã½ÎÄ»¯×÷Æ·, have caught a glimpse of a new and rocky planet called LP 791-18d. There, temperatures on the dayside could climb to more than 250 degrees Fahrenheit, while volcanoes blast the planet's surface.