Europe Goes Solo to Venus After NASA Pulls Its Radar

Europe's space agency is moving ahead alone with a robotic mission to Venus after NASA said it probably can't deliver the radar instrument it promised. The spacecraft, called Envision, will orbit Venus and map its surface. Venus is wrapped in thick clouds of sulfuric acid, so ordinary cameras can't see the ground at all. Radar can — it works like sonar mapping the ocean floor. Envision's radar would see the surface about 10 times sharper than NASA's last Venus radar mission in the 1990s.

So why did NASA back out? Money. The Trump administration proposed cutting NASA's science budget nearly in half for 2026 and 2027. Congress restored most of it, but NASA still has about $220 million less than last year, so managers are trimming partnerships with other countries. NASA had already spent more than $50 million on the Venus radar before stepping back. It's also wavering on two European space telescopes, LISA and New Athena, both planned for launch in the late 2030s.

Rather than wait, the European Space Agency has hired teams in the United Kingdom and Italy to design a European-built radar with the same abilities. The goal is still to launch in 2031 on Europe's Ariane 6 rocket and to hunt for signs of active volcanoes. ESA's science chief says member countries have committed record funding — up 3.5 percent a year through 2028, plus inflation — so Europe can afford to go it alone.

The catch: doing it solo costs Europe more, and the design could change along the way. "We don't know what the final design will be, but we have the same requirements," the mission's project scientist said. The bigger lesson is that when one country's budget politics shift, global science projects rarely stop — they get reorganized, and someone else picks up the tab.