A white dwarf’s unusual chemistry points to a giant planet containing material shed during the star’s death. If confirmed, the system would provide the first evidence of a second-generation planet ...

Niobium, a heavy metal never before found in a white dwarf, shows up in the atmosphere of HS 0209+0832 at more than 1,000 ...

"This pattern of elements is a telltale sign of the 's-process,' a nuclear reaction that builds heavy elements inside dying ...