Space Daily·2 min read·medium
In 1676 a Danish astronomer noticed the eclipses of Jupiter's moon Io kept arriving late as Earth pulled away, and used the delay to conclude that light does not travel instantly
✦AI Summary
The article recounts how Danish astronomer Ole Rømer used the timing of Jupiter's moon Io to prove that light has a finite speed. By observing delays in eclipses, he concluded that light does not travel instantaneously.
In 1676, at the young Paris Observatory, a Danish astronomer named Ole Rømer was keeping careful time on a moon of Jupiter and finding that it would not keep time back. Io, the innermost of the large Jovian moons, slipped into Jupiter’s shadow and ou... [6433 chars]
scienceeducation
✦
Get the full story
Sign up for Headlinne to unlock AI insights, political bias analysis, and your personalized news feed.
Create free accountAlready have an account? Sign in