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Chinese researchers discovered a pulsar that simultaneously exhibits three emission variability phenomena—intermittent nulling, mode switching, and periodic amplitude modulation—overturning previous observations that pulsars show only one or two such variations.
Xona Space Systems is developing a constellation of 258 low-Earth orbit satellites called Pulsar to provide a GPS alternative with 100x stronger signals, enabling centimeter-level accuracy indoors and in dense urban areas, with initial launches planned for October 2026.
An experimental satellite has mapped GPS jamming across Europe and the Middle East, revealing a larger scale of interference than expected. The findings highlight vulnerabilities in GNSS signals and the need for more resilient navigation systems.