ALT The darkness of space covering the entire image. At the center the Moon looks like a dark circle covering the Sun with its rays peeking out from the edges. This image taken at 10:19:24 on August 21, 2017 as Oregon begins to see first light 'diamond' following totality. Photographer: Dominic Hart

ALT A Progress cargo spacecraft in low Earth orbit approaching the International Space Station ahead of docking. The docking unit is visible and solar panels extend horizontally from the sides of the spacecraft. Earth's limb can be seen below.

ALT A 360-degree view inside the sandbox portion of the Crew Health and Performance Exploration Analog (CHAPEA) habitat at NASA’s Johnson Space Center in Houston. The walls are decorated with an image of the Martian landscape. Credit: NASA/Bill Stafford