An official website of the United States government
The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before
sharing sensitive information, make sure you’re on a federal
government site.
The site is secure.
The https:// ensures that you are connecting to the
official website and that any information you provide is encrypted
and transmitted securely.
Cronin JR, Pizzarello S.Cronin JR, et al. Among authors: pizzarello s.Adv Space Res. 1983;3(9):5-18. doi: 10.1016/0273-1177(83)90036-4.Adv Space Res. 1983.PMID: 11542462