NASA Reveals: 'Asteroid' 1998 SH2 Is Actually an Active Comet After 27 Years
For 27 years, the object 1998 SH2 was cataloged as an inert asteroid. Now NASA scientists have discovered it is actually an active comet, hidden in plain sight. The finding, published in Nature Astronomy, could reshape planetary defense strategies, as comets can subtly change their orbits due to gas emissions.