Mars was once a wet and habitable world, so what happened to change that? According to a new study from Washington University in St. Louis, Mars' small size is likely to blame for why it lost most of its water and atmosphere.
Hear the sounds of space. The videos in this post are what happens when scientists turn astronomical data into sound, via a process called sonification.
NASA scientists say that there were once thousands of volcanic eruptions on Mars. These explosive blasts, in the northern Arabia Terra region, were "super eruptions," the largest and most powerful kind known. The intense activity continued for about 500 million years, about four billion years ago.
Scientists in the U.K. have developed a kind of "space concrete" using dust and human blood that could be used for future human habitats on Mars or the moon.
Astronomers have found that planets form in cosmic soups of organic molecules. These soups have different ingredients, leading to a wide diversity of planets.