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bad_motivator t1_iyasjg5 wrote

Reply to comment by KillasArt in Artemis 1 at its furthest point in its moon orbit, about 268,000 miles from earth. by kjpmi

Your point?

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KillasArt t1_iyaszx1 wrote

My point is, how can we see stars on earth but not up there that high?

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blue-ten t1_iyax8d1 wrote

We see stars with our eyes, but they are relatively dim. In order to see stars with a camera, you need to let the sensor expose for a long time, no matter how high up you are. The consequence of a long exposure is that brighter objects, like the Moon, Earth, and the spacecraft would be overexposed bright blobs.

You can test this with a camera here on Earth.

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KillasArt t1_iyaxlog wrote

Thank you for your mature response, I've learned something today.

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alsheps t1_iyb0k9b wrote

You know how you can't see as many stars in the city as you can in the country? like say if are in the City, you look up, and you can see stars and stuff, but when you go out to farm land there's so many more stars that are visible?

That's what's happening here. The light bouncing off Artemis-1's fuselage is causing the light coming from the stars we'd expect to see to appear much much dimmer, due to the camera not taking in light for as long given the brightness of Artemis-1. It's only going to caputre the really large, bright objects in the frame, i.e. the Earth, Moon, and Artemis-1.

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mfb- t1_iyb1g1j wrote

How many stars do you see during the day? Zero (well, one if we count the Sun). Exactly the same thing happens here. The objects pictures are in broad daylight, exposure settings that show them won't show stars.

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