OB starOB stars are hot, massive stars of spectral types O or early-type B that form in loosely orga


OB starOB stars are hot, massive stars of spectral types O or early-type B that form in loosely orga
OB starOB stars are hot, massive stars of spectral types O or early-type B that form in loosely orga
OB starOB stars are hot, massive stars of spectral types O or early-type B that form in loosely orga