Expedition 24 Flight Engineer Tracy Caldwell Dyson, left, Commander Alexander Skvortsov, center and Mikhail Kornienko sit in chairs outside the Soyuz Capsule just minutes after they landed near the town of Arkalyk, Kazakhstan on Saturday, Sept. 25, 2010. Russian Cosmonauts Skvortsov and Kornienko and NASA Astronaut Caldwell Dyson, are returning from six months onboard the International Space Station. (AP Photo/NASA - Bill Ingalls)
This image provided by NASA shows the eye of Hurricane Igor taken from the International Space Station Tuesday Sept.14, 2010, by astronaut Douglas Wheelock. At midnight Sept. 15, 2010, Igor was about 1140 miles southeast of Bermuda with maximum sustained winds of 155 mph moving to the west-northwest at 9 mph. (AP Photo/NASA - Doug Wheelock)
This image provided by the National Aeronautics and Space Administration shows Hurricane Earl at 12:45 a.m. EDT on Thursday, Sept. 2, 2010. As of Wednesday night, Earl was a powerful Category 4 hurricane centered more than 520 miles south-southeast of Cape Hatteras, N.C., with winds of 140 mph. (AP Photo/NASA)
This image provided by the National Aeronautics and Space Administration shows Hurricane Earl (lower right) at 1 a.m. EDT on Wednesday, Sept. 1, 2010. At 11 p.m. EDT Tuesday the center of the storm was located about 910 miles south-southeast of Wilmington, N.C. The Category 4 hurricane was moving northwest at 15 mph with maximum sustained winds of 135 mph. (AP Photo/NASA)
Hurricane Earl passes over the Leeward Islands on Monday, Aug. 30, 2010, in this image from the National Aeronautics and Space Administration. (AP Photo/NASA)
FILE - This Thursday, Feb. 14, 2008 image provided by NASA shows astronaut Alan Poindexter exercising on a bicycle ergometer on the space shuttle Atlantis while docked with the International Space Station. Astronauts can become as weak as 80-year-olds after six months at the International Space Station, according to a new study that raises serious health concerns as NASA contemplates prolonged trips to asteroids and Mars. (AP Photo/NASA)
Expedition 24 astronauts Tracy Caldwell Dyson and Douglas Wheelock work outside the International Space Station on Monday, Aug. 16, 2010, as they prepare to install a cooling pump module, replacing one that failed. (AP Photo/NASA)
In a photo made from NASA television, Expedition 24 astronaut Tracy Caldwell Dyson works outside the space station Monday Aug. 16, 2010 as she and Douglas Wheelock prepare to install a cooling pump module, replacing the one that failed. (AP Photo/NASA)
This image provided by NASA of the Petermann Glacier and the new iceberg was acquired from the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) instrument on NASA's Terra spacecraft on Thursday Aug. 12, 2010. It covers an area of 49.5 by 31.5 kilometers (30.7 by 19.5 miles), four times the size of New York's Manhattan island. According to scientists the recently calved iceberg is the largest to form in the Arctic in 50 years. (AP Photo/NASA)
