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Observational Astronomy

Ground-based Telescopes LIGO/Virgo/KAGRA Collaboration Gravitational Wave Detectors Gravitational Wave Transient Catalog Gaia Satellite MAGIC Telescopes Multiwavelength Observations LIGO Discoveries KM3NeT Experiment Fermi-LAT Observations GW170817 Data Analysis Neutrino Astronomy Telescope Measurements Interference Patterns Space Telescopes GW250114 Collision Laser Interferometer Space Antenna APOGEE Instrument X-ray Astronomy Astrophysical Environments Cosmological Surveys LIGO Observations LHAASO IceCube AstroSat Data LIGO-Virgo-KAGRA Electromagnetic Observations DESI Collaboration LIGO LIGO-Virgo-KAGRA Detectors H.E.S.S. Observatory Multi-Messenger Observations NASA Missions James Webb Space Telescope

New Studies Probe KM3NeT’s Ultra-High-Energy Neutrino, Testing New Physics Against Cosmogenic Models

Researchers assess whether Earth-crossing distances could enable sterile-to-active conversion that boosts KM3NeT detections relative to IceCube.

XL-Calibur Balloon Measures Hard X-Ray Polarization of Cygnus X-1 With Record Precision

LHAASO Links Cosmic-Ray 'Knee' to Black Hole Micro-Quasars

Ground Telescopes Capture Polarized Microwave Light From Cosmic Dawn