# R3 | openai/gpt-5.6-luna | run 2

## Prompt

Who was awarded the 2020 Nobel Prize in Physics, and for what? Cite your sources.

## Response

The **2020 Nobel Prize in Physics** was shared by **Roger Penrose, Reinhard Genzel, and Andrea Ghez** for discoveries concerning black holes and the supermassive object at the center of the Milky Way. [1] [Nobel Prize summary](https://www.nobelprize.org/prizes/physics/2020/summary/) ([nobelprize.org](https://www.nobelprize.org/prizes/physics/2020/summary/?utm_source=openai))

- **Roger Penrose** received one-half of the prize “for the discovery that black hole formation is a robust prediction of the general theory of relativity.”
- **Reinhard Genzel** and **Andrea Ghez** jointly received the other half “for the discovery of a supermassive compact object at the centre of our galaxy.” [2] [Nobel Prize press release](https://www.nobelprize.org/prizes/physics/2020/press-release/) ([nobelprize.org](https://www.nobelprize.org/prizes/physics/2020/press-release/_/?utm_source=openai))

Their work established both the theoretical inevitability of black holes under general relativity and strong observational evidence for the supermassive black hole known as **Sagittarius A\*** at the Milky Way’s center.

Would you like a brief explanation of how Genzel and Ghez detected Sagittarius A\*?
