The Orbital ATK Antares rocket, with the Cygnus spacecraft onboard, launches from Pad-0A, Monday, May 21, 2018 at NASA’s Wallops Flight Facility in Virginia. Cygnus will deliver approximately 7,400 pounds of science and research, crew supplies and vehicle hardware to the International Space Station and its crew.

The Orbital ATK Antares rocket, with the Cygnus spacecraft onboard, is seen at launch Pad-0A, Saturday, May 19, 2018, at Wallops Flight Facility in Virginia. Liftoff is currently targeted for 4:39 a.m. Eastern on Monday, May 21.

NGC 1032 cleaves the quiet darkness of space in two in this image from the NASA/ESA Hubble Space Telescope.

Astronaut Ricky Arnold took this selfie during the May 16, 2018, spacewalk.

This image of the southern Greenland town of Narsaq was taken during an Operation IceBridge flight on Apr. 26, 2018.

Each and every day NASA’s Solar Dynamics Observatory (SDO) observes our Sun and relays observational data to scientists on Earth.

Galileo Galilei discovered Jupiter’s moon Europa in 1610. More than four centuries later, astronomers are still making discoveries about its icy surface.

In the darkness of the distant universe, these galaxies resemble glowing fireflies, flickering candles, charred embers floating up from a bonfire, and light bulbs softly shining.

The crew of the International Space Station snapped this image of the full moon on April 30, 2018, as the station orbited off the coast of Newfoundland, Canada.

Warm air and sunlight beget warmer ocean waters and provoke blooms of the “grass of the sea”—phytoplankton.