NASA Satellites Catch a Skull in Antarctic Ice — and a Warning

Some of the snow that did fall was lost to sublimation — ice turning directly into water vapor — and to strong winds that swept it away.

"The winter season was no treat for these glaciers," Pelto said.

How can bare ice speed up melting?

Snow is bright. It reflects most sunlight back into space. Darker, exposed ice absorbs far more solar energy, so as Antarctic daylight lengthens and temperatures climb, those dark surfaces will warm faster and melt more quickly.

Even a little fresh snowfall could buy time. "Even a thin cover of new snow from a spring storm would be helpful in the short run," Pelto said.

Melting will also redraw the face itself. The formations that make the skull are vulnerable as glaciers retreat.

"When entombed in snow and ice, the skull is preserved. But when exposed to melt, it weathers away, which will lead to a changing jawline and expanding eye socket," Pelto said.

How long have scientists tracked these glaciers?

Decades. A 1982 study — among the first detailed surveys — combined early Landsat satellite data, aerial photography and topographic maps. It identified four ice caps on Vega Island, rocky cliffs rising above the ice, and 29 glaciers flowing outward from the caps.

Devil's Bay Glacier, the skull's jaw, has been monitored closely since the Antarctic summer of 1998-1999. Those measurements show an overall loss of glacier mass. Satellite observations across recent decades show the other glaciers on the island losing ice too, exposing more of the bedrock underneath.

The pattern is consistent and long-term. Vega Island's ice has been shrinking for at least 40 years of recorded observation.

What's the island's exploration history?

Before satellites, Vega Island played a part in one of Antarctica's grimmest survival stories. The Swedish Antarctic Expedition of 1901-1903 set out to study the geography, geology, climate and wildlife of the eastern Antarctic Peninsula and surrounding areas.

The mission went wrong. The explorers split into three groups, each forced to spend the Antarctic winter in a different spot. Pack ice then destroyed their ship, stranding them in one of the planet's harshest environments.

Hope arrived in spring 1903. Two of the groups reunited at a site later named Cape Well-met — near what now looks like the skull's forehead. An Argentine expedition soon reached them and rescued the survivors.

Today the island combines dramatic formations, exploration history and a changing climate in one frame. The skull may be Antarctica's strangest sight, but the slow transformation of the ice shaping it carries the real story: winter snow is failing, dark ice is spreading, and the melt season ahead could come fast.