Available now! 2026 EarthSky lunar calendar. A unique and beautiful poster-sized calendar showing phases of the moon every night of the year! And it makes a great gift. The world's 3rd known interstellar object - 3I/ATLAS - made its closest pass of the sun back on October 29, 2025.

Nuclear physicists are notching scientific advances for fusion energy, fueling hopes - and billions in investment - to create an energy source that doesn't produce carbon or nuclear waste. Why it matters: For decades, scientists have chased the dream of using fusion for limitless clean energy.