Photos Of Frozen 'Ghost Apples' Are Going Viral. What Are They?

When their temperature drops to around -18°C (around 0°F), their structure collapses, and a few could spew their rotten contents successfully. Although some may wonder why the apples didn't freeze solid during the polar vortex, Shoemaker noted that the apple has a significant acid content, so it would have to get exceedingly cold before it froze solid. It's certainly unique, but I would guess it has happened before, he said, adding: but it probably never had exposure to a journalist before.