N.B. Click on the diagram to view a larger image
or download a PDF-file with the diagram.
Infrared emissions from Comet Hale-Bopp signal the predominance
of a crystalline form of olivine, in the mineral dust emerging from the comet. The same material is conspicuous in a dust cloud around a young
star, where planet formation may be in progress. Both spectra were
obtained with the same instrument in the European Space Agency's
Infrared Space Observatory ISO.