A NASA spacecraft on Tuesday began sending back the first of 72 anticipated pictures of its flyby with a comet aiming to reveal how the comet's surface has changed since it skimmed by the Sun in 2005.
The initial pictures from US space agency's Stardust-NExT mission spacecraft were posted on NASA's website, and more were expected throughout the day.
NASA also planned to hold a press conference later Tuesday to discuss the findings.
The closest moment of the Valentine's night encounter came at 11:39 pm Estern time in the United States, or 0439 GMT, at a distance of 181 kilometers (112 miles) from Tempel 1, NASA said.
The Stardust-NExT spacecraft was rapidly snapping pictures of the Tempel 1 comet as they passed.
Space experts are curious to see how a trip around the Sun has affected the surface of the Tempel 1, which is about six kilometers (3.7 miles) wide and travels on an orbit that brings it as close to the Sun as Mars and as far away as Jupiter.
Tempel 1 was last glimpsed in 2005 by NASA's Deep Impact mission as the comet was shooting toward the Sun on its five-year orbit between Mars and Jupiter.
Deep Impact pummeled the comet with a special impactor spacecraft and the material that came out was a surprise to scientists: a cloud of fine powdery material emerged, not the water, ice and dirt that was expected.
Deep Impact also found evidence of ice on the surface of the comet, not just inside it.
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