Topic
Study of celestial gamma-ray emissions using space telescopes like Fermi and Swift and ground-based arrays such as H.E.S.S. and CTAO.
Four 23 m Large-Sized Telescopes at La Palma are complete after a ceremony attended by some 250 scientists and officials. The array still faces commissioning, so the promised gains in sensitivity and resolution are projections.
Reality
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