A new survey of over 20,000 young stars has mapped the presence of water, carbon dioxide, and carbon monoxide ice in the regions where planets form. The findings show a sharp decrease in these ice signatures as stars age beyond three million years, i...

White dwarfs often possess disks of planetary debris created when rocky bodies are torn apart by tidal forces. New calculations show that these fragments are not infinitely small, but are limited by a kilometer-size barrier due to internal cohesive f...