A "Smart Ruler" Could Help Swarms of Space Telescopes Image Exoplanets

We’ve talked plenty of times here about the infeasibility of launching a mirror big enough to directly image exoplanets using current rocket fairings – at least as long as we’re not sending them 500+ AU away to a gravitational lensing point. We’ve also talked at length about the potential solution to that problem – interferometry, where multiple smaller satellites link up precisely, but are spaced far enough apart to act as one gigantic mirror. The problem is, from a technical standpoint, it’s really hard to build these kinds of systems. But the field has taken another step forward with a new paper from researchers at Xidian University and the Beijing Institute of Control Engineering, published in Space: Science & Technology, which describes a system to both control and calibrate a free-floating interferometer.
Source: https://www.universetoday.com/articles/a-smart-ruler-could-help-swarms-of-space-telescopes-image-exoplanets
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