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A recent large survey of low-albedo asteroid spectra in the 3-μm region show a range of hydrated compositions, with one large group similar to the CM chondrites and a second large group showing ...

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Visitors in the PSI parking lot view the Moon and Saturn through telescopes on Oct. 28, 2015. Credit: PSI/Alan Fischer On the evening of Oct. 28, 2025, the Planetary Science Institute hosted a ...

Painting by PSI Cofounder and Senior Scientist Emeritus William K. Hartmann As Siding Spring Comet passed by Mars on Oct. 19, 2014, it broke up in the atmosphere, creating a luminescent shower in the ...