New close-up images of Pluto's equator sent by Nasa's New Horizons flyby probe reveal a giant range of young mountains rising as high as 11,000 feet (3,500 meters) above the surface of the planet's icy body.
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|Icy mountains on Pluto and a new, crisp view of its largest moon, Charon, are among the several discoveries announced Wednesday by NASA's New Horizons team, just one day after the spacecraft's first ever Pluto flyby. – (NASA/JHU APL/SwRI) || |
Data suggest that the mountains were formed no more than 100 million years ago – the youngest in the 4.56-billion-year-old solar system.
The close-up region, which covers about one per cent of Pluto's surface, could be geologically active as well, say NASA scientists.
"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 in Washington. "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."
''Home run!'' said Alan Stern, principal investigator for New Horizons at the Southwest Research Institute (SwRI) in Boulder, Colorado. ''New Horizons is returning amazing results already. The data look absolutely gorgeous, and Pluto and Charon are just mind blowing."
The mountains on Pluto likely formed no more than 100 million years ago - mere youngsters in a 4.56-billion-year-old solar system. This suggests the close-up region, which covers about one per cent of Pluto's surface, may still be geologically active today.
''This is one of the youngest surfaces we've ever seen in the solar system,'' said Jeff Moore of the New Horizons Geology, Geophysics and Imaging Team (GGI) at NASA's Ames Research Center in Moffett Field, California.
Unlike the icy moons of giant planets, Pluto cannot be heated by gravitational interactions with a much larger planetary body. Some other process must be generating the mountainous landscape.
''This may cause us to rethink what powers geological activity on many other icy worlds,'' says GGI deputy team leader John Spencer at SwRI.
The new view of Charon reveals a young and varied terrain, surprising scientists by the apparent lack of craters. A swath of cliffs and troughs stretching about 600 miles (1,000 km) suggests widespread fracturing of Charon's crust, likely the result of internal geological processes. The image also shows a canyon estimated to be 4 to 6 miles (7 to 9 km) deep. In Charon's north polar region, the dark surface markings have a diffuse boundary, suggesting a thin deposit or stain on the surface.
New Horizons also observed the smaller members of the Pluto system, which includes four other moons: Nix, Hydra, Styx and Kerberos.
A new sneak-peak image of Hydra is the first to reveal its apparent irregular shape and its size, estimated to be about 27 by 20 miles (43 by 33 km).
The observations also indicate Hydra's surface is probably coated with water ice. Future images will reveal more clues about the formation of this and the other moon billions of years ago. Spectroscopic data from New Horizons' Ralph instruments reveal an abundance of methane ice, but with striking differences among regions across the frozen surface of Pluto.
The Johns Hopkins University Applied Physics Laboratory in Laurel, Maryland designed, built and now operates the New Horizons spacecraft and manages the mission for NASA's Science Mission Directorate.
SwRI leads the mission, science team, payload operations and encounter science planning. New Horizons is part of NASA's New Frontiers Programme, managed by the agency's Marshall Space Flight Center in Huntsville, Alabama.