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A NASA contest for the next five weeks is looking for the best photographs of the Earth taken by astronauts aboard the International Space Station (ISS).

The Tournament Earth competition was kicked off by the agency's Earth Observatory and features images from more than 20 years of snapshots by spacewalkers.

SpaceX pressed ahead with its second attempt to launch astronauts for NASA- a historic first for a private company- but more stormy weather threatened more delays.

Elon Musk's company came within 17 minutes on May 27 of launching a pair of NASA astronauts for the first time in nearly a decade from the U.S., before the threat of lightning forced a delay.

A new era of human spaceflight is set to begin as American astronauts once again launch on an American rocket from American soil to the International Space Station as part of NASA's Commercial Crew Program. NASA astronauts Robert Behnken and Douglas Hurley will fly on SpaceX's Crew Dragon spacecraft, lifting off on a Falcon 9 rocket at 4:33 p.m.

Two American astronauts on Feb. 25 stepped out on the second of three spacewalks to prepare the International Space Station for the arrival of commercial capsules ferrying astronauts in the coming years.