However, even on desert planets in so-called habitable zones around ... for instance, and Saturn's moon Titan is covered in dark sands made from organic matter. NASA hopes to learn more about ...

The Moon also periodically covers Venus ... In one glance, an observer can see the barren, airless lunar surface and a cold, desert planet that once harbored rivers, lakes, and potentially ...

Here's when and how to watch the next full moon and February's rare planetary parade, starting with the shiny bright planet of Venus.