A NASA astronaut shared images of Earth from space.
Bob Behnken captured the 'boundary between night & day'.
Behnken has shared many Earth images, like the Saharan dust cloud.
Behnken is aboard the International Space Station.
Behnken & fellow NASA astronaut Doug Hurley created history in May 2020.
They became the first astronauts to travel to Space Station on SpaceX's Dragon capsule atop Falcon 9 rocket.
Watch the full video for more.