Scientists have discovered two rare white dwarfs—which are among the dimmest stars in the universe—that feature changes in ...

Recent observations of this type have revealed that the r-process is not necessarily ... which occur when a radioactive isotope fuses with a helium nucleus and spits out a neutron. “These reactions ...

Inhaling helium and talking like Daffy Duck is a classic party trick. But not many know how helium works. Helium is much lighter than air, so sound waves move much faster through the gas.