New details of Pluto's largest moon Charon reveal a swath of cliffs and troughs stretching about 600 miles. At upper right, along the moon's curving edge, is a canyon estimated to be four to six miles deep. Credit:NASA
Just one day after NASA's New Horizons spacecraft made its closest approach to distant Pluto, scientists got their first glimpse at images showing that the dwarf planet and its largest moon may both be geologically active.
That has the space agency now searching the data coming back from the space probe for evidence of geysers and volcanoes.
"It's a small world with deep canyons, troughs and cliffs and dark regions that are still mysterious to us," said mission deputy project scientist Cathy Olkin during a news conference Wednesday afternoon. "There is so much interesting science in one image alone.... Pluto did not disappoint. I can add that Charon did not disappoint either."
Alan Stern, New Horizons' principle investigator, was quick to call the first information coming back from New Horizons amazing. "Home run!" he said. "The data look absolutely gorgeous, and Pluto and Charon are just mind blowing."
New Horizons, a piano-sized spacecraft that has been traveling 3 billion miles through the solar system for more than nine years, made its closest approach to Pluto on Tuesday.
On Tuesday night, the spacecraft sent a signal back to Earth that it was functioning well, had traveled its intended path and had collected images and measurements about Pluto and its satellites.
Then early on Wednesday morning, New Horizons began to send back the best images and data on Pluto and its system that anyone has ever seen.
"Pluto New Horizons is a true mission of exploration, showing us why basic scientific research is so important," said John Grunsfeld, associate administrator for NASA's Science Mission Directorate. "The mission has had nine years to build expectations about what we would see during closest approach to Pluto and Charon. Today, we get the first sampling of the scientific treasure collected during those critical moments, and I can tell you it dramatically surpasses those high expectations."
Scientists speaking at Wednesday's news conference also said they believe the mountains on Pluto are made up of ice.
"Water ice at Pluto temperatures is strong enough to hold up huge mountains and that's what I think we're seeing here," said, John Spencer, one of New Horizons' lead scientists. "It's the first time we've seen an icy world that isn't orbiting a giant planet."
According to NASA, the mountains on Pluto likely formed no more than 100 million years ago. That would make them "mere youngsters" in a 4.56-billion-year-old solar system.
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