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17 April 2014 12:48 pm ,
Vol. 344 ,
Officials last week revealed that the U.S. contribution to ITER could cost $3.9 billion by 2034—roughly four times the...
An experimental hepatitis B drug that looked safe in animal trials tragically killed five of 15 patients in 1993. Now,...
Using the two high-quality genomes that exist for Neandertals and Denisovans, researchers find clues to gene activity...
A new report from the Intergovernmental Panel on Climate Change (IPCC) concludes that humanity has done little to slow...
Astronomers have discovered an Earth-sized planet in the habitable zone of a red dwarf—a star cooler than the sun—500...
Three years ago, Jennifer Francis of Rutgers University proposed that a warming Arctic was altering the behavior of the...
- 17 April 2014 12:48 pm , Vol. 344 , #6181
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NEAR and Eros in an Eternal Embrace
12 February 2001 7:00 pm
"The NEAR Shoemaker spacecraft is safely on the surface of Eros," Robert Farquhar proudly announced at 3:30 EST this afternoon. The NEAR (Near Earth Asteroid Rendezvous) mission director and controllers at the Johns Hopkins Applied Physics Laboratory in Laurel, Maryland, had just guided a half-ton spacecraft to such a gentle touchdown on the 33-kilometer asteroid Eros that the orbiter didn't miss a beat in its radio transmissions. The pictures returned just before touchdown revealed details on a centimeter scale that may help planetary scientists solve several mysteries about the asteroid.
The programmed descent of NEAR Shoemaker went without a hitch, even though the craft was never designed to contact anything. A single rocket fired at 10:31 a.m., sending the spacecraft toward the surface. Then four braking maneuvers in the final hour slowed it from 32 kilometers per hour to its touchdown speed, which was intended to be the pace of a slow jog. Still, the chance of survival was not much more than 1%, Farquhar said. Much to the surprise of all, a signal continued for at least half an hour after touchdown. "I think we can claim we soft-landed on the surface," Farquhar said.
The last image returned before contact shows a rocky, airless surface far different than that of the moon. Apollo astronauts drove around many a crater as deep as the day a meteorite gouged it out, but a fine, thick "soil," or regolith, covers the surface of Eros and has somehow ponded in small impact craters. And on Eros, boulders stick up through the regolith as if planted there rather than appearing to have fallen from a larger, nearby impact. If its last pictures help solve such mysteries, NEAR Shoemaker can rest in peace.