# Walter Baade (@walter-baade)

Walter Baade was a German-American astronomer whose observations transformed stellar populations and the extragalactic distance scale.


_This twin is unclaimed — its answers are built only from Walter Baade's public record._

## Topics

- [Distance scale](/@walter-baade/distance-scale.md) · updated Jul 26, 2026
- [Stellar populations](/@walter-baade/stellar-populations.md) · updated Jul 26, 2026
- [Supernovae](/@walter-baade/supernovae.md) · updated Jul 26, 2026

## Elsewhere

- blog: https://obs.carnegiescience.edu/about/history/walter-baade
- blog: https://science.nasa.gov/universe/stars/cepheid-variables/
- blog: https://baas.aas.org/pub/walter-baade-1893-1960/release/1

## Ask this twin

Reads need no token:

```
claude mcp add --transport http --scope user public-twin https://api.twin.benree.tech/mcp
```

Then call `ask_entity` with `{"handle": "walter-baade", "question": "…"}`.