The Rosetta team is hoping that a software patch will help re-establish reliable contact with the little Philae lander, lodged somewhere on the comet's surface.
Scientific arguments suggest that alien civilizations should be common in our galaxy. If so, where is everybody? That question is known as the Fermi paradox.
Moon might harbor bits blasted off Earth billions of years ago. These lunar time capsules could hold secrets of what Earth was like as life first emerged.
Members of the EarthSky community - including scientists, as well as science and nature writers from across the globe - weigh in on what's important to them.