Space Astrometric Interferometer Constellation
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Long-baseline interferometry space telescopes don't exist yet because optical sensors have not been developed that record both amplitude and polarization of incident light, as they do for radio astronomy. If such sensors existed, then space telescopes could be sent to locations millions of kilometers apart, collect light from distant space objects, transmit their data to a ground-based facility, and digitally combined to create a single extreme-high-resolution synthetic image. This would be incredibly useful for astrometrics, such as determining the actual distances to galaxies without using standard candles.
For example, two space telescopes could be placed at the Sun-Saturn L4-L5 Lagrange Points, with 16.474 AU separation. If they have sensors that detect 15 nanometer wavelengths (extreme ultraviolet light), and if they're capable of functioning as an interferometer, the effective angular resolution would be 1.527 femto-arcseconds.
This space astrometric interferometer constellation would be capable of directly measuring the distances to every galaxy in the visible universe.
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