This image of star trails was compiled from time-lapse photography taken by NASA astronaut Christina Koch while onboard the International Space Station. via NASA https://ift.tt/2MU6zE0

Astronomers using data from NASA’s Chandra X-ray Observatory and other telescopes have put together a detailed map of a rare collision between four galaxy clusters. via NASA https://ift.tt/2WfBlKL

The Medusa merger, was not always one entity, but two. An early galaxy consumed a smaller gas-rich system, throwing out streams of stars and dust into space. These streams resemble the writhing snakes that Medusa, a monster in ancient Greek mythology, famously had on her head in place of hair, lending the object its intriguing name. via NASA https://ift.tt/2M6YhXC

Engineers and technicians at NASA’s Michoud Assembly Facility in New Orleans have structurally mated the first of four RS-25 engines to the core stage for NASA’s Space Launch System (SLS) rocket that will help power the first Artemis mission to the Moon. via NASA https://ift.tt/31CuETR

Vice President Mike Pence delivers remarks during the opening ceremony of the 70th International Astronautical Congress. via NASA https://ift.tt/2Pa9Pwo

NASA astronaut Christina Koch conducts her fourth spacewalk at the International Space Station with fellow NASA astronaut Jessica Meir via NASA https://ift.tt/31uE9V3

In 1572, Danish astronomer Tycho Brahe was among those who noticed a new bright object in the constellation Cassiopeia. via NASA https://ift.tt/31prkLF

NASA astronaut Christina Koch works while tethered near the Port 6 truss segment of the International Space Station. via NASA https://ift.tt/32lR4tR

Amy Ross, a spacesuit engineer at Johnson Space Center, NASA Administrator Jim Bridenstine, watch as Kristine Davis and Dustin Gohmert wear prototype spacesuits. via NASA https://ift.tt/33AwnKU

NASA astronaut Dr. Serena Auñón-Chancellor speaks about her experience on Expeditions 56 and 57 onboard the International Space Station (ISS) at Excel Academy Public Charter School, Monday, June 10, 2019. via NASA https://ift.tt/2B72oy6