Space photo of the day for May 7, 2025
The European Space Agency (ESA) is two dozen steps closer to launching Plato, a spacecraft that will search for terrestrial planets outside of our solar system, after the installation of 24 of its 26 cameras.
ESA's Plato, or PLAnetary Transits and Oscillations of stars, mission will use its 26 cameras simultaneously to study terrestrial exoplanets in orbits up to the habitable zone of sun-like stars. The mission will measure the sizes of these worlds and discover exomoons and rings around them. Plato will also characterize the planets' host stars by studying tiny light variations in the starlight it receives.
As pictured here, the work to give Plato its sensitive eyes is nearing completion. Twenty-four of the 26 cameras have been installed on the spacecraft's optical bench, the structure that keeps all cameras firmly pointed in the right direction. Two more "fast" cameras will be installed in the coming weeks.
"This activity is one of the most critical in building the satellite. The cameras are delicate elements that must be attached to the spacecraft's supporting structure with great accuracy, to ensure that they are very precisely aligned," said Thomas Walloschek, ESA's Plato project manager, in a statement.
At present, the Plato spacecraft is under assembly at OHB, an aerospace contractor, in Germany.
When it launches in 2026, Plato will be sent into a halo orbit around the Sun-Earth Lagrange point-2 (L2).
Plato's 24 cameras are arranged in four groups of six that have the same field of view. The lines of sight of the four groups are offset by an angle of 9.2 degrees. With this configuration, the cameras can survey a very large area of the sky, more than 2000 square degrees, at once.
The 24 identical cameras will make images every 25 seconds, while the two "fast" cameras will make them every 2.5 seconds.
Each of the 24 cameras is equipped with four CCD light sensors for a total of 81.4-megapixel images per camera, resulting in two-billion-pixel images for the overall spacecraft. These will be the largest images ever for a space mission.
You can read more about Plato, Europe's planet-hunting telescope, and more about exoplanets.
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