Aurora waves goodbye and lets the stars take center stage. Goodnight from the International Space Station. | NASA Astronaut Jeff Williams

Aurora waves goodbye and lets the stars take center stage. Good night from @Space_Station.https://t.co/Qq5NoNi0uT

— Jeff Williams (@Astro_Jeff) August 4, 2016

NASA Astronauts Jeff Williams & Kate Rubins on the International Space Station want to wish Team USA Good Luck at the Rio 2016 Olympics!

.@NASA astronauts on the @space_station want to wish #TeamUSA GOOD LUCK at #Rio2016!https://t.co/Y9CFKKLPbn

— U.S. Olympic Team (@TeamUSA) August 4, 2016

Istanbul, Turkey | NASA Astronaut Jeff Williams | International Space Station

Travel across the Bosphorus strait, Istanbul Turkey. Continental boundary between Europe and Asia.https://t.co/Um7eg0Qsqo

— Jeff Williams (@Astro_Jeff) August 3, 2016

These wild looking swirl formations are not clouds, but rather ice flows off of Newfoundland. | NASA Astronaut Jeff Williams | International Space Station

These wild looking swirl formations are not clouds, but rather ice flows off of Newfoundland.https://t.co/lH0KIsf2QY

— Jeff Williams (@Astro_Jeff) July 28, 2016

Grand Teton National Park, Wyoming | NASA Astronaut Jeff Williams | International Space Station

Grand Teton National Park, Wyoming. #FindYourPark #NPS100https://t.co/DRRST4SiNO

— Jeff Williams (@Astro_Jeff) July 27, 2016

"Aurora approaches and lights up our International Space Station" | NASA Astronaut Jeff Williams | International Space Station

Aurora approaches and lights up our @Space_Station.https://t.co/v3TYtRFQvk

— Jeff Williams (@Astro_Jeff) July 27, 2016

Northern Rockies, Canada and Montana, including Glacier National Park! | NASA Astronaut Jeff Williams | International Space Station

Northern Rockies, Canada and Montana, including @glaciernps #FindYourPark #NPS100https://t.co/yMeIQFSnIT

— Jeff Williams (@Astro_Jeff) July 26, 2016

Albuquerque, New Mexico. Zoom to Northeast Heights and fly across the Valley. In view is the University of New Mexico, downtown area, and the zoo. | NASA Astronaut Jeff Williams | International Space Station

Albuquerque New Mexico. Zoom to Northeast Heights and fly across the Valley. In view is @UNM, downtown, and the zoo.https://t.co/2hPIliSsfc

— Jeff Williams (@Astro_Jeff) July 26, 2016

Women of NASA on LEGO Ideas: NASA Astronaut Mae Jemison

Women of NASA on LEGO Ideas: Support & Vote!

The Grand Canyon of the Tuolumne River. Yosemite National Park. Hetch Hetchy reservoir to Lembert Dome. | NASA Astronaut Jeff Williams | International Space Station

The Grand Canyon of the Tuolumne River @YosemiteNPS. Hetch Hetchy reservoir to Lembert Dome. #FindYourPark #NPS100https://t.co/Ht98hl5KZC

— Jeff Williams (@Astro_Jeff) July 19, 2016

"Some celestial aurora to brighten your Sunday." | NASA Astronaut Jeff Williams | Goodnight from the International Space Station

Some celestial aurora to brighten your Sunday. pic.twitter.com/SXrVxktWst

— Jeff Williams (@Astro_Jeff) July 17, 2016

"Do you like cloud watching? Then you might enjoy these side profiles during sunset." | NASA Astronaut Jeff Williams | Goodnight from the International Space Station

Do you like cloud watching? Then you might enjoy these side profiles during sunset. Good night from @Space_Stationhttps://t.co/uqJlZRv935

— Jeff Williams (@Astro_Jeff) July 13, 2016

"Beautiful view of the Grand Canyon National Park today. It looks like a new fire has broken out near the north rim." | NASA Astronaut Jeff Williams | International Space Station

Beautiful view of the @GrandCanyonNPS today. It looks like a new fire has broken out near the north rim. pic.twitter.com/n951JUO3f5

— Jeff Williams (@Astro_Jeff) July 13, 2016

"Wow! Look at how the navy blue contrasts with the aqua, Gulf of Batabano Cuba" | NASA Astronaut Jeff Williams | International Space Station

Gulf of Batabano Cuba. Video created from merged panorama.https://t.co/X8Olp5Qw2W

— Jeff Williams (@Astro_Jeff) July 13, 2016

Paris at Night | International Space Station