Cosmic Exploration · discovery
Helium
1868 · Norman Lockyer, Jules Janssen
- Year
- 1868
Description
An unexplained yellow line in the Sun's spectrum during a total eclipse. It was named for the Sun and not found on Earth for another 27 years — the only element discovered off-world first.
Open on the Cosmic Exploration shelf — the interactive card, the filters, and everything alongside it.