Scientists were able to grow plants in lunar soil. They weren't quite as robust as those grown in earthly soil. But it's a key step for future space missions.
Happy Earth Day! As a celebration of Earth on this fine day, enjoy these photos, a collection of the 10 best Earth images from space. What are your favorites?
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.