Editing X-ray astronomy (section)

===High-resolution gamma-ray and hard X-ray spectrometer (HIREGS)===
A balloon-borne experiment called the High-resolution gamma-ray and hard X-ray spectrometer (HIREGS) observed X-ray and gamma-rays emissions from the Sun and other astronomical objects.<ref name="hiregs">{{cite web|url=http://sprg.ssl.berkeley.edu/balloon/|title=HIREGS}}</ref><ref>{{Cite journal|last=Feffer|first=Paul|year=1996|title=Solar energetic ion and electron limits from High-Resolution Gamma-ray and Hard X-ray Spectrometer (HIREGS) Observations|journal=Solar Physics|volume=171|issue=2|pages=419–445|doi=10.1023/A:1004911511905|bibcode=1997SoPh..171..419F|s2cid=116604571 }}</ref> It was launched from [[McMurdo Station]], [[Antarctica]] in December 1991 and 1992. Steady winds carried the balloon on a circumpolar flight lasting about two weeks each time.<ref>{{Cite book|title=X-ray and Gamma-ray Observations of Solar Flares|last=Feffer|first=Paul|publisher=UMI Company|year=1997|location=Ann Arbor, MI}}</ref>