It appeared where almost nothing can be seen.

For decades, astronomers believed the inner solar system was largely mapped, its major wanderers accounted for and its hidden corners steadily shrinking. Then, in the blinding margin near our Sun, something massive slipped into view. Not drifting lazily, but moving with startling urgency. The object had been there all along, concealed by glare and geometry, completing its tight laps around our star unnoticed. Now that it has been detected, researchers are confronting an unsettling possibility. If something this large could remain hidden until now, what else might still be racing through that same unforgiving light?



