NASA Orders LISA's Engineering Test Telescope From L3Harris
L3Harris will build a test telescope for LISA, the ESA-led space observatory designed to detect gravitational waves from merging giant black holes.
NASA has contracted L3Harris Technologies to design, assemble and integrate an Engineering Test Unit telescope for the Laser Interferometer Space Antenna (LISA), a final step before flight hardware is built. NASA announced the order on October 8, 2026. LISA is led by ESA and slated for launch in the mid-2030s, with NASA contributing the telescopes and other hardware.
LISA will be three spacecraft flying in a triangle 2.5 million km (1.6 million miles) on a side, exchanging infrared laser beams. Each spacecraft carries two telescopes made entirely of Zerodur, a glass-ceramic that barely changes shape when its temperature changes. That stability matters because LISA must measure changes in distance smaller than the width of a helium atom across millions of kilometers.
The payoff is a new band of gravitational waves. Ground detectors such as LIGO, which made the first detection of gravitational waves in 2015, hear high-frequency signals from merging stellar-mass black holes. Pulsar timing arrays listen at far lower frequencies, as in the NANOGrav evidence for a gravitational-wave background. LISA fills the gap between them, where mergers of supermassive black holes are expected to be loudest. This contract is engineering, not science: no new observations come from it, but the hardware has to work before the mission can fly.
What to watch next: tests of the engineering unit will feed directly into the design of the flight telescopes for the mid-2030s launch.
Primary source
This summary is based on NASA. Read the original for full details, data and caveats.
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