In an image provided by NASA, astronaut Randy Bresnik prepares to enter Boeing's CST-100 spacecraft for an evaluation at the company's Houston Product Support Center. NASA awarded Boeing with a $4.2 billion contract Tuesday. AP hide caption

itoggle caption AP

Closeup of Philae's primary landing Site J, which is located on the "head" of Comet 67P/Churyumov–Gerasimenko. The image was taken by Rosetta's OSIRIS narrow-angle camera on Aug. 20. ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA hide caption

itoggle caption ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA

A handout picture provided by Nicaraguan Army on Monday shows the place where what was first reported as a meteorite fell close to International Airport Augusto Sandino, in Managua, Nicaragua. Nicaraguan Army/ Handout/EPA/Landov hide caption

itoggle caption Nicaraguan Army/ Handout/EPA/Landov