From past to planets

 Far beyond Pluto, where sunlight is little more than a faint glow, astronomers have discovered something strange. A small icy world in the outer reaches of our solar system appears far more active than it should be. In a region where everything is expected to be frozen and silent, this distant object may still be changing and evolving. Why It's a Mystery Scientists expected worlds this far from the Sun to be geologically dead. Temperatures are so low that most activity should have stopped billions of years ago. Yet observations suggest that some distant objects may still show signs of unexpected activity beneath their frozen surfaces. What Researchers Think One possibility is that heat trapped deep inside these worlds is still driving changes. Another idea is that hidden reservoirs of volatile ices occasionally erupt or shift beneath the surface. If true, these distant bodies may be much more complex than anyone imagined. Why It Matters Understanding these mysterious w...