Expedition 50 Flight Engineer Thomas Pesquet of the European Space Agency shared this photograph from the International Space Station on Feb. 14, 2017, writing, “Venice, city of gondoliers and the lovers they carry along the canals. Happy Valentine’s Day!” via NASA http://ift.tt/2kti7fZ

When seen up close, the F ring of Saturn resolves into multiple dusty strands. This Cassini view shows three bright strands and a very faint fourth strand off to the right. via NASA http://ift.tt/2lc53zv

The Andromeda constellation is one of the 88 modern constellations and should not be confused with our neighboring Andromeda Galaxy. via NASA http://ift.tt/2kcRMCB

Jeanette Scissum joined NASA’s Marshall Space Flight Center in 1964 after earning bachelor’s and master’s degrees in mathematics from Alabama A&M University. Scissum published a NASA report in 1967, “Survey of Solar Cycle Prediction Models,” which put forward techniques for improved forecasting of the sunspot cycle. via NASA http://ift.tt/2lofO2M

A sunrise photo of Edwards Air Force Base’s Rogers Dry Lake was taken after heavy rainfall in southern California. NASA’s Armstrong Flight Research Center is seen in the foreground. via NASA http://ift.tt/2kmG89u

The Larsen Ice Shelf is situated along the northeastern coast of the Antarctic Peninsula, one of the fastest-warming places on the planet. In the past three decades, two large sections of the ice shelf (Larsen A and B) collapsed. A third section (Larsen C) seems like it may be on a similar trajectory, with a new iceberg poised to break away soon. via NASA http://ift.tt/2khVD2e

Seen from outside, Enceladus appears to be like most of its sibling moons: cold, icy and inhospitable. via NASA http://ift.tt/2kdYKIB

The Calabash Nebula, pictured here is a spectacular example of the death of a low-mass star like the sun. via NASA http://ift.tt/2k9Nu2t

Dr. George Carruthers, right, and William Conway, a project manager at the Naval Research Institute, examine the gold-plated ultraviolet camera/spectrograph, the first moon-based observatory that Carruthers developed for the Apollo 16 mission. Apollo 16 astronauts placed the observatory on the moon in April 1972. via NASA http://ift.tt/2kwxJTs

This panorama, photographed by an astronaut aboard the International Space Station, shows nearly the full length of Lake Powell, the reservoir on the Colorado River in southern Utah and northern Arizona. Note that the ISS was north of the lake at the time, so in this view south is at the top left of the image. via NASA http://ift.tt/2jw0kt1