How do astronomers map invisible matter across the entire sky?

Weak lensing—the bending of starlight by gravity—reveals where matter hides in the universe. Standard methods struggle with incomplete survey coverage and noise, requiring expensive matrix inversions. AKRA 3.0 treats the core calculation as a flowing operation rather than a fixed array, cutting memory needs from quadratic to linear. Applied to Dark Energy Survey Year 3 data, it produced the sharpest convergence map available, revealing the cosmic matter skeleton without added assumptions.