⏰ when
When was the first evidence for galaxies beyond the Milky Way established?
Quick Answer
In 1924, Edwin Hubble showed that the Andromeda Nebula was a separate galaxy beyond the Milky Way.
The Full Story
In 1924, Edwin Hubble identified Cepheid variable stars in the Andromeda Nebula and used them to estimate its distance. The result showed Andromeda was far outside the Milky Way and therefore a separate galaxy. This solved a major astronomy debate about the scale of the universe. It was a foundational discovery in extragalactic astronomy.
Key Facts
1.Key result in 1924
2.Used Cepheid variables
3.Andromeda is a separate galaxy
YouTube Angle
Suggested video title for this topic:
"The moment humans learned the Milky Way was not the whole universe."
Was this answer helpful?
Tap a reaction — it helps us pick what to cover next.