TECHNOLOGY

Gamma Ray and Neutron Detector (GRaND) Instrument

Click on the yellow hotspots and roll over the blue and green hotspots to explore how the GRaND instrument works.

The Gamma Ray and Neutron Detector (GRaND) instrument interactive illustrates how scientists learn about the composition of an asteroid by studying energy and neutrons that emanate from it. The Dawn spacecraft contains three instruments (GRaND, Visible Infrared Spectrometer, and the Framing Camera) that will provide new answers to questions about the formation and evolution of the early solar system.

- Electromagnetic Spectrum diagram
- Dawn Dictionary
- Explanation by GRaND PI Tom Prettyman (MP3 Run time: 6 min.)
- Transcript of explanation (PDF 40 Kb)
- Encyclopedia of the Solar System article by Tom Prettyman (Article originally published in 2007)