Topic
Space-based observation of gamma rays, including spectral-line searches in galaxy clusters with the Fermi telescope.
H.E.S.S. searched 546 hours of Milky Way centre data for a single-energy gamma-ray line from dark matter and found no significant signal. Its upper limits now reach the annihilation rates the collaboration says matter for WIMPs, a leading dark matter candidate.
Reality
NASA's Swift observatory, in orbit since 2004, will re-enter by year's end after the Katalyst spacecraft sent to boost it developed faults in orbit. NASA now presents the year-long effort as practice for fast commercial satellite servicing.
Reality
Two of three reaction wheels failed on Katalyst's LINK spacecraft, so NASA cancelled the capture-and-boost. What is left, rendezvous and proximity data, is what this industry can actually do.
Perspective Coverage
5 publishersReality
Simplified treatments of the secondary mirror's shadow can misstate how much of a muon's Cherenkov light reaches the camera by up to 40 percent, ten times the calibration precision CTAO requires of itself.
Reality
A team reports a spectral spike in 15.5 years of Fermi data from Virgo, Fornax and Ophiuchus. The same signal goes quiet where dark matter should be densest, near our own galactic centre.
Reality