Back to Article List How to observe a lunar eclipse The Moon passing through Earth's shadow is one of the most dramatic sky events — it's also one of the easiest to observe. By Michael E. Bakich | Published: May 15, 2010 | Last updated on May 18, 2023 Key Takeaways: Astronomy magazine Senior Editor Michael E. Bakich explains how to watch a lunar eclipse.
Solar System Before spacecraft, how did astronomers determine the mass, size, and composition of the giant planets?