Space Contents Archive

Spiral Aurora over Icelandic Divide [Image credit: Juan Carlos Casado]

Arcturus (widefield)

Taken with and edited on mobile phone.

Explore Mars with this new 3D map, created using 110,000 images from NASA's Mars Reconnaissance Orbiter

catch the chicken! (IC2944, the running chicken nebula) Image credit: Daniel Stern]

Perseverance Landing Livestream removed from YouTube

Hey, the landing livestream from Perseverance was the most clicked video on NASA's YouTube channel, but I just noticed it is gone... ​ Does anyone know why? thanks!

Soviet Moon Landings

Where can one view video footage of the soviet unmanned moon landings? All of the documentaries and such I see online only show images, never video. I wonder how their's compares to the US

A treasure from the NASA Tech Reports Server: a novel nuclear thermal rocket design

I came across a [1994 article](https://ntrs.nasa.gov/citations/19950005290) some years ago proposing to increase the thrust of nuclear thermal rockets by adding liquid oxygen, and thus combustion, to the hydrogen at the throat. The idea behind increasing thrust would be to use mined lunar oxygen to save weight on the hydrogen tanks, while still allowing high specific impulses. The effect would be to make these “nuclear shuttles” more sustainable and reliable. Seeing as I only just today learned about Ryan Gosse’s new [NTR design idea](https://www.nasa.gov/directorates/spacetech/niac/2023/New_Class_of_Bimodal/) that combines it with a nuclear electric rocket and a wave rotor pump, I wonder if the LANTR and the Gosse design could be hybridized, creating a nuclear rocket that could attain both very high thrusts and 4000-sec Isp. What are your thoughts?

Update on my realtime black hole

Whirlpool Galaxy

Canada proposes to develop robotic lunar rover for Artemis

Could us some help with my astrophotography.

Hey Reddit. I have a new nexstar 4se with a Nikon D3500 setup. When I attempt to take pictures of the stars I see they look like this https://astronomy.stackexchange.com/questions/43684/what-is-that-donut-shaped-object-i-see-in-my-telescope According to this article and some other ones I’ve read it is caused by a focus issue causing me to see the shadow of the secondary mirror. My eyepiece appears in focus of Mars, but the camera is showing the donut shape. Do I need to adjust the focus of the telescope differently when I am using the camera? If so any best practices for adjusting? Sample photos or?

Perseverance Rover - A long journey indeed

NASA's Mars Perseverance rover acquired this image using its onboard Right Navigation Camera (Navcam). The camera is located high on the rover's mast and aids in driving. This image was acquired on April 9, 2023 (Sol 759) at the local mean solar time of 14:21:56. Image Credit: NASA/JPL-Caltech

Milky Way Season Begins in Florida

Why is the SLS and Shuttle ET’s hydrogen tank 2.5-2.7 times bigger than the oxygen tank?

I noticed the ideal stoichiometric ratio of hydrogen to oxygen is 2:1. Why add the extra hydrogen? Is it extra margin for hydrogen leaks? Is there a definitive NASA paper that addresses this mismatch?

Cosmic dusts near Andromeda