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

(phys.org)
268 points wglb | 2 comments | 16 Nov 24 16:48 UTC | HN request time: 0.419s | source
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wglb ◴[16 Nov 24 16:49 UTC] No.42157343[source]▶
This is seriously cool. One lens galaxy is amazing, but two! (Too bad that this is not steerable.)

Underlying paper: https://arxiv.org/abs/2411.04177

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hinkley ◴[16 Nov 24 19:21 UTC] No.42158524[source]▶
It would be cool if we some day had special days of astronomy where every telescope is turned to galactic eclipses the way they once did for solar eclipses.

The sky is huge and we are moving, so surely some would happen in our lifetimes?

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yreg ◴[16 Nov 24 21:00 UTC] No.42159287[source]▶
Surely any such eclipse lasts a long time. From the perspective of our lifetimes it is static.
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1. hinkley ◴[17 Nov 24 21:04 UTC] No.42167231[source]▶
The farther away they are the slower they would scan the sky behind them or go out of conjunction. So I guess one of the objects would have to be something relatively close.
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2. yreg ◴[18 Nov 24 07:04 UTC] No.42170401[source]▶
Are we not talking about galaxies? No galaxy is "close".