Radio telescopes around the world listened for signals from Huygens to measure wind speeds on Titan as the probe descended through its atmosphere last month. The telescopes discovered that winds on Titan are very weak near the surface, and then increase in intensity with altitude. Huygens passed through winds going nearly 435 kph (270 mph) at an altitude of 120 km (75 miles). Cassini was originally supposed to make these measurements, but there was a configuration problem with one of its receivers.