You might think of our solar system as fixed and unchanging. But that doesn't take into account the constant discoveries ...

Add Yahoo as a preferred source to see more of our stories on Google. A pellet of plutonium 238, illuminated by the glow of its own radioactivity. NASA and other space agencies use this material in ...

China envisions exploring the solar system, and it seems that would happen soon. The country launched Tianwen-2, an innovative space probe tasked with retrieving samples from an uncharted asteroid and ...

Introduction: NASA's solar system exploration paradigm : the first fifty years and a look at the next fifty / James L. Green and Kristen J. Erickson -- Part I. Overview. Exploring the Solar System : ...

Active small bodies—including comets, active asteroids, icy minor planets, and transitional objects—occupy a unique position in planetary science. As ...

Visit NAP.edu/10766 to get more information about this book, to buy it in print, or to download it as a free PDF. We live in an extraordinary period of exploration. Over the last few decades, humanity ...