Ultraviolet rays reveal new information about the FU Orionis mechanism. In 1936, the young star FU Orionis (FU Ori) dramatically brightened and became much more luminous. Since then, its brightness has gradually faded. Initially considered an isolated case, FU Ori is now recognized as part of a group of tumultuous young stars called (…)
Unexpected Heat Wave from a Star: FU Orionis Challenges Astrophysical Models
