this post was submitted on 03 Apr 2026
820 points (99.6% liked)

Space

2322 readers
1019 users here now

A community to discuss space & astronomy through a STEM lens

Rules

  1. Be respectful and inclusive. This means no harassment, hate speech, or trolling.
  2. Engage in constructive discussions by discussing in good faith.
  3. Foster a continuous learning environment.

Also keep in mind, mander.xyz's rules on politics

Please keep politics to a minimum. When science is the focus, intersection with politics may be tolerated as long as the discussion is constructive and science remains the focus. As a general rule, political content posted directly to the instanceโ€™s local communities is discouraged and may be removed. You can of course engage in political discussions in non-local communities.


Related Communities

๐Ÿ”ญ Science

๐Ÿš€ Engineering

๐ŸŒŒ Art and Photography


Other Cool Links


founded 3 years ago
MODERATORS
 

This image of home just came down from the Artemis II crew.

Taken after their translunar injection burn, there are aurorae at top right and lower left, and zodiacal light at lower right.

Credit: NASA/Reid Wiseman

// That's home. That's us.

Source

you are viewing a single comment's thread
view the rest of the comments
[โ€“] Obi@sopuli.xyz 3 points 3 hours ago* (last edited 3 hours ago) (1 children)

EDIT: I've now seen this is actually the night side, so it checks out.

This is full of interesting but slightly puzzling information.

First, it's shot at 22mm, which is a pretty wide angle, so I guess they were still pretty close when they took it.

What's really puzzling to me though, is why did they need to crank up the exposure so much?

We're looking at 51k ISO @ f4, I can shoot in really dark places with this kind of ISO (but I don't, because it looks like trash).

They seem to be shooting the day side of earth as far as I can tell, so I don't really understand why they needed that much sensitivity, instinctively I would've assumed you'd only need the same kind of settings you'd use on daytime exteriors here on earth (so nowhere near that ISO).

[โ€“] mech@feddit.org 2 points 42 minutes ago (1 children)

They seem to be shooting the day side of earth as far as I can tell

It looks like the daytime side because the ISO is cranked up that high.
This is the nighttime side, only lit by reflected moonlight. The sun is behind earth on the bottom right.
They wanted to fire off that first shot as soon as all of earth fit in the window, instead of waiting 12 hours.

[โ€“] Obi@sopuli.xyz 2 points 15 minutes ago

Yeah I realized that afterwards. At the end of the day moonlight is basically just sunlight but dimmer (also something you learn when trying to shoot night scenes), that's why we can shoot "day for night" and it looks mostly correct.