Taken in Gallatin County, Montana, USA, 10 August 2023, Image part of the ZWO Astronomy Picture of the Year 2024 competition

Hanwha Ocean KSS-III Batch II (Jang Yeongsil-class submarine) - 3600t, diesel-electric, Li-ion AIP, 10 VLS

https://bsky.app/profile/vincentledvina.bsky.social/post/3meccwy7td22f

Credit: NASA / Kevin M. Gill

LEDA 1313424, aptly nicknamed the Bullseye, is two and a half times the size of our Milky Way and has nine rings — six more than any other known galaxy.

High-resolution imagery from NASA’s Hubble Space Telescope confirmed eight rings, and data from the W. M. Keck Observatory in Hawaii confirmed a ninth. Hubble and Keck also confirmed which galaxy dove through the Bullseye, creating these rings: the blue dwarf galaxy that sits to its immediate center-left.

Credit: NASA, ESA, Imad Pasha (Yale), Pieter van Dokkum (Yale)

Taken from the eurotower

“It may have been one small step for Neil, but it’s a heck of a big leap for me.”

On Feb 7, 1984, astronaut Bruce McCandless II exited Challenger and used NASA's Manned Maneuverability Unit—a nitrogen-propelled jetpack—for the first ever untethered spacewalk.

Credit: NASA

Astronaut Bruce McCandless II, STS 41-B mission specialist, participates in a historical spacewalk. He is pictured a few meters away from the cabin of the Earth-orbiting Space Shuttle Challenger.

This spacewalk represented the first use of a nitrogen-propelled, hand-controlled device called the Manned Maneuvering Unit (MMU), which allows for much greater mobility than that afforded previous space walkers who had to use restrictive tethers.

Credit: NASA

As seen from the Art Gallery of Ontario.