J1721+8842: The first Einstein zig-zag lens — mentioned by westurner

Sat, 16 Nov 2024 20:50:08 GMT

To zoom into a reflection on a lens or a water droplet? From "Hear the sounds of Earth's magnetic field from 41,000 years ago" (2024) https://news.ycombinator.com/item?id=42010159 : > [ Redshift, Doppler effect, ] > to recall Earth's magnetic field from 41,000 years ago with such a method would presumably require a reflection (41,000/2 = 20,500) light years away To see Earth in a reflection, though Age of the Earth: https://en.wikipedia.org/wiki/Age_of_Earth : > 4.54 × 10^9 years ± 1% "J1721+8842: The first Einstein zig-zag lens" (2024) https://arxiv.org/abs/2411.04177v1 What is the distance…

Paper and discussion history. A mention is not an endorsement.

J1721+8842: The first Einstein zig-zag lens — mentioned by wglb

Sat, 16 Nov 2024 16:49:26 GMT

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

Paper and discussion history. A mention is not an endorsement.

J1721+8842: The first Einstein zig-zag lens · HackerPapers discussions

J1721+8842: The first Einstein zig-zag lens — mentioned by westurner

J1721+8842: The first Einstein zig-zag lens — mentioned by wglb