Adam Riess from the Space Telescope Science Institute and colleagues have now made a more precise, direct measurement that reinforces the mismatch and could signal new physics.
Radiation emitted around a distant black hole has revealed the existence of extragalactic planets in a galaxy 3.8 billion light years away.
Multi-messenger astronomy, neutrino physics and dark matter are among several topics set to take priority in Europe, according to a report by the Astroparticle Physics European Consortium (APPEC).
A new national facility at La Silla Observatory in Chile, operated by the European Southern Observatory (ESO), made its first observations at the beginning of the year.
The spectrum of J1342+0928 gives us a view on the universe when it was just 690 million years old.
New measurements by the High-Altitude Water Cherenkov (HAWC) experiment hints at a more exotic origin of the positron excess.
The CALorimetric Electron Telescope (CALET) has released its first results concerning the nature of high-energy cosmic rays.
The Pierre Auger collaboration has published results showing that the arrival direction of ultra-high-energy cosmic rays (UHECRs) is far from uniform.
The era of multi-messenger astronomy is here, calling for next-generation gravitational-wave observatories.
A group of researchers from Keio University in Japan has now shown strong evidence for the existence of an intermediate-mass black hole (IMBH) within the Milky Way.