Astronaut Ricky Arnold took this selfie during the May 16, 2018, spacewalk. via NASA https://ift.tt/2L8kFyR

This image of the southern Greenland town of Narsaq was taken during an Operation IceBridge flight on Apr. 26, 2018. via NASA https://ift.tt/2Itd8IW

Each and every day NASA’s Solar Dynamics Observatory (SDO) observes our Sun and relays observational data to scientists on Earth. via NASA https://ift.tt/2IkYsf2

Galileo Galilei discovered Jupiter’s moon Europa in 1610. More than four centuries later, astronomers are still making discoveries about its icy surface. via NASA https://ift.tt/2wElr3b

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. via NASA https://ift.tt/2rA7xKw

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. via NASA https://ift.tt/2rviCfM

Warm air and sunlight beget warmer ocean waters and provoke blooms of the “grass of the sea”—phytoplankton. via NASA https://ift.tt/2IqMWlB

Astronaut-educator Ricky Arnold conducts student-designed science on the Space Station. via NASA https://ift.tt/2rskpSU

The NASA InSight spacecraft launches onboard a United Launch Alliance Atlas-V rocket, Saturday, May 5, 2018, from Vandenberg Air Force Base in California. InSight, short for Interior Exploration using Seismic Investigations, Geodesy and Heat Transport, is a Mars lander designed to study the “inner space” of Mars: its crust, mantle, and core. via NASA https://ift.tt/2wo8P0f

NASA’s InSight spacecraft rests aboard a ULA Atlas V rocket, awaiting launch scheduled on May 5, 2018. via NASA https://ift.tt/2jsm0Uk