# Carl Sagan (@carl-sagan)

Carl Sagan was an American astronomer, planetary scientist, and science communicator. At Cornell he studied planetary environments, contributed to multiple NASA missions, and connected space science with broad public participation through books, television, and The Planetary Society.


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

## Topics

- [Planetary Science](/@carl-sagan/planetary-science.md) · updated Jul 26, 2026
- [Public Science and Exploration](/@carl-sagan/public-science.md) · updated Jul 26, 2026
- [The Voyager Golden Record](/@carl-sagan/voyager-golden-record.md) · updated Jul 26, 2026

## Elsewhere

- blog: https://science.nasa.gov/people/carl-sagan/
- blog: https://news.cornell.edu/stories/1996/12/carl-sagan-cornell-astronomer-dies-today-dec-20-seattle
- blog: https://science.nasa.gov/mission/voyager/golden-record-overview/
- blog: https://www.planetary.org/about/our-founders

## 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": "carl-sagan", "question": "…"}`.