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First images from Euclid are in

(dlmultimedia.esa.int)
544 points mooreds | 2 comments | 21 Oct 24 20:15 UTC | HN request time: 0s | source
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lfmunoz4 ◴[22 Oct 24 00:22 UTC] No.41909953[source]▶
600x zoom didn't seem to help from the 150x zoom. Wonder if we will ever be able to see actual planet surfaces or we need some other technology to do that, i.e, we should have small satellites every 10 light years. but this map is amazing and a good step forward.

Edit: Was just thinking that image does us tells us something i.e, there no large artificial structures or billboards anywhere we can see. Maybe I watch too much sci-fi but honestly would have expected someone to build some huge structure around a star or planet, would be disappointing if no one does.

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stouset ◴[22 Oct 24 00:29 UTC] No.41909980[source]▶
There is zero way to optically resolve an exoplanet’s surface without something like a gravitational lens.
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frabjoused ◴[22 Oct 24 02:42 UTC] No.41910695[source]▶
If light is hitting it, can you explain why not?
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1. thrtythreeforty ◴[22 Oct 24 03:35 UTC] No.41910961[source]▶
The naïve optical instrument will be diffraction limited. The resolving power of a lens, basically how "sharp" the resulting image will be, goes down as you decrease the size of the aperture relative to the focal length (that is, as the f-stop number goes up).

A telescope that could zoom into an exoplanet would have an f value of a kajillion or so.

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2. stouset ◴[22 Oct 24 06:07 UTC] No.41911626[source]▶
You’d need a 90km aperture to get a one pixel image of an Earth-sized exoplanet at 100ly.