The World Meteorological Organization said that the last three months were the hottest on record for Earth. See charts and hear what officials have to say.
Space junk is an increasing problem. With more countries and private companies entering space, more junk is accumulating and no one is in charge of cleaning up.
A space rock that came to rest in the Sahara desert is more than 4.5 billion years old. It helps scientists understand the conditions of our early solar system.