How the Crab Nebula’s Pulsing Heart Stayed Hidden for Centuries
Ancient astronomers chronicled the shifting heavens, diligently charting the movements of our star-studded canopy. The moon’s face morphed nightly, our planetary neighbors came and went, and occasionally a brilliant, icy vagrant would sweep by.
But the stars? Those stayed pretty much in the same place, relative to one another. So when new, starry points of light briefly appeared and then faded away, Earth’s sky gazers noticed.