A spacecraft mission to Saturn’s moon Enceladus found unexpectedly high methane in its ice plumes, fueling speculation about life in its hidden ocean. A new Nature Astronomy sutdy shows current models can’t reliably distinguish that methane from purely non-biological sources. The one signal that could tell life apart from chemistry, a molecular “handedness” pattern, would likely be destroyed before we could ever detect it.
There’s a hard physical limit on spotting a planet next to its blinding star. However, it turns out today’s telescopes aren’t hitting it. New work maps out exactly how close in we could still detect the faint, Earth-like worlds we want to find the most.
What if the ingredients for life did not bubble up from a pond or vent, but fell from space as dust? A new paper suggests ancient glaciers may have collected this cosmic dust, concentrated it, and helped kick-start prebiotic chemistry.
Not just the right temperature for water, but the right chemical recipe: only planets formed in a narrow nitrogen-, phosphorus-, and oxygen-balanced “Goldilocks” zone may keep life’s key ingredients available at their surface.