quasars that passed through the stream, and detected the spectral fingerprints of these elements from the way they absorb ultraviolet light. Quasars are
ultraviolet measurements of distant quasars behind the Magellanic Stream. As the ultraviolet light from the quasars passed through the stream, Hubble recorded
from seven quasars — the bright cores of distant active galaxies — to measure how it filtered through the Leading Arm’s gas. These quasars reside billions