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Two galaxies aligned in a way where their gravity acts as a compound lens

(phys.org)
268 points wglb | 1 comments | 16 Nov 24 16:48 UTC | HN request time: 0.31s | source
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ck2 ◴[16 Nov 24 18:30 UTC] No.42158113[source]▶
Fund the SGL Telescope!

https://www.universetoday.com/149214/if-we-used-the-sun-as-a...

Seriously, we could build that, it's at the limit of our tech but if it was either we walk on the moon again or build SGL, I'd pick SGL

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dmix ◴[16 Nov 24 18:36 UTC] No.42158166[source]▶
I made this comment before but someone on HN made a good argument is way harder than it sounds and given it's size/cost/function it'd basically have to point in one direction, it's not like an easily moveable telescope you can scan around with.
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skykooler ◴[16 Nov 24 18:55 UTC] No.42158333[source]▶
Yeah, you basically need to launch a new one for every target you want to image.
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1. Voultapher ◴[16 Nov 24 20:42 UTC] No.42159135[source]▶
I'd think to make it practical you'd have to have kind of (semi-) automatic space based assembly infrastructure that builds them and launches them. Launching these probes individually seems like it would be impractical. Building that infrastructure wouldn't be easy at all and I don't see that happening in the next 50 years.