H II region
= H II region
{wiki=H_II_region}
An H II region is a large cloud of gas and dust in space that is ionized by the radiation from young, hot stars. The term "H II" refers to the presence of hydrogen ions (protons) in the region.
= H II region
{wiki=H_II_region}
An H II region is a large cloud of gas and dust in space that is ionized by the radiation from young, hot stars. The term "H II" refers to the presence of hydrogen ions (protons) in the region.