“The Galactic Heart” | Source: Rubin Observatory / NOIRLab / National Science Foundation / AURA - Image Credit: J. daSilva, M. Zamani (artist’s impression)

What You’re Seeing: Stellar streams arcing through and around the Milky Way

Made Of: Stars stripped from dwarf galaxies and star clusters by gravity

Why They Exist: Past mergers and close encounters stretched these systems into long, thin ribbons

What They Trace: The Milky Way’s gravitational field—visible and invisible

Dark Matter Clue: Gaps, bends, and kinks in streams reveal clumps of dark matter

Scale: Some streams span tens of thousands of light-years

Time Capsule: Each stream preserves a record of events billions of years old

Why Rubin Matters: Rubin Observatory will uncover many more streams than ever detected

Scientific Payoff: Helps reconstruct the Milky Way’s formation history in unprecedented detail

Big Picture: Our galaxy didn’t grow quietly—it grew by eating, stretching, and reshaping others

🐾 Feline Perspective: Many paths. All lead somewhere important. I will block every single one.

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