Pluto Has a Giant Ice Heart — and We Only Saw It Clearly in 2015
Answers: “what did new horizons discover at pluto?”
Pluto was discovered in 1930, but for 85 years it remained little more than a fuzzy speck of light — even the Hubble Space Telescope could only resolve it as a blurry blob of a few pixels. Nobody knew what its surface actually looked like.
That changed on July 14, 2015, when NASA’s New Horizons spacecraft — after a nine-year, five-billion-kilometer journey — screamed past Pluto at over 50,000 km/h and photographed it up close for the first time in history.
The images stunned everyone. Pluto wasn’t a dead, cratered rock. Splashed across its surface was an enormous, bright, heart-shaped region of ice, now informally called Tombaugh Regio after Pluto’s discoverer. And that was just the beginning:
- Mountains of water ice rising 3,000 metres, as tall as the Rockies, frozen hard as granite in the extreme cold
- Vast glaciers of nitrogen ice that appear to slowly flow and churn, resurfacing the “heart” and erasing craters — meaning Pluto is geologically active, despite being one of the coldest places in the solar system
- Hazy blue skies, and hints of a possible liquid water ocean hidden beneath the icy crust
This was a genuine shock. Pluto is so far from the Sun and so cold (around –230°C) that it “should” be frozen solid and geologically dead. Instead it’s alive with slow, icy activity — nobody is fully sure what keeps it going.
New Horizons had only a few hours to gather data as it flew past; it couldn’t stop or orbit. It’s now heading out of the solar system entirely, having given us our one and only close look — turning a blurry dot that had puzzled astronomers for 85 years into a real, complex world in a single afternoon.