As elementary schoolers, we learned the order of the planets. Maybe your teacher even had a snappy mnemonic like “My Very Educated Mother Just Served Us Nine Pizzas” or “My Very Educated Mother Just ...

Mars could have lost its liquid water, the key ingredient of life, because it is small, according to a study. Washington University researchers say that the Red Planet's size may be the key reason it ...

Artist's rendition of Mars with Earth-like surface water. We have a fleet of robots seeking out habitability on Mars, but is the planet too small for life in the first place? A new study suggests that ...