【冥王星的表面景象】

The Dwarf Planet’s Landscape-

【冥王星的表面景象】

New Pluto Photos Reveal a Closer Look at the Dwarf Planet’s Landscape

More than two months have passed since the New Horizons spacecraft made its historic flyby of Pluto on the morning of July 14. But the moment of closest approach, at roughly 7:49 that morning, was just the harbinger of a trove of new information still to come. The spacecraft continues to send back data, like the image NASA released on Thursday that was taken by its wide-angle Ralph/Multispectral Visual Imaging Camera just 15 minutes after the flyby.

“This image really makes you feel you are there, at Pluto, surveying the landscape for yourself,” New Horizons Principal Investigator Alan Stern isquoted as saying of the panorama downlinked from the spacecraft on Sunday and published Thursday, which shows a 780-mile stretch of the dwarf planet. “But this image is also a scientific bonanza, revealing new details about Pluto’s atmosphere, mountains, glaciers and plains.”

Fifteen minutes after flying past Pluto, at 11,000 miles above its surface, the New Horizons spacecraft turned around to face the dwarf planet, the sun lighting it from behind, to capture the high-resolution image of the landscape.

The smooth, icy plain on the right side of the image has been informally named Sputnik Planum (or Sputnik Plain, after the Earth’s first artificial satellite). To the west of the plain, one can see mountains that rise to heights of up to 11,000 feet above Pluto’s surface, and to the east “rougher terrain is cut by apparent glaciers.”

The scientists have released two additional versions of the same image that zoom in on smaller sections of the landscape to show 230- and 115-mile stretches.

Scientists point out layers in the dwarf planet’s extended nitrogen atmosphere that extend to at least 60 miles above the surface, as well as some fog or low-lying haze. “In addition to being visually stunning, these low-lying hazes hint at the weather changing from day to day on Pluto, just like it does here on Earth,” Will Grundy, lead of the New Horizons Composition team, is quoted as saying.

In this small section of the larger crescent image of Pluto, the setting sun illuminates a fog or near-surface haze, which is cut by the parallel shadows of many local hills and small mountains. The image was taken from a distance of 11,000 miles, and its width is 115 miles. NASA/JHUAPL/SWRI

condensed from News Week.

09/22/2015