TIL The world's biggest and the most low-frequency-sensitive radio telescope array is at Pune and recently helped detect nano hertz gravitational waves

It helped detect the first nano hertz gravitational waves https://indianexpress.com/article/cities/pune/punes-gmrt-first-indian-facility-detect-gravitational-waves-8692416/lite/ which needs high sensitivity, probably originated from merger of two super massive blackholes.

Nano + Hz

If I remember units correctly that is a frequency of # per billion seconds, yeah? That would be a frequency of once per 30 years, surely I'm missing something...