The planet-spotting method unites the future of astronomy—the Nancy Grace Roman Space Telescope—and its past, a technique used by 19th-century astronomers.
suggests that exoplanets that exist in the Universe without a parent star could be more common than stars themselves, but until now spotting them has been difficult.
CLEoPATRA will exploit this brightening, which is called microlensing when it involves a lensing object of small mass like a planet, and use parallax to measure the distance to these rogue worlds. Astronomers in the 19th century used this phenomenon to measure the distances to close stars by observing how their positions shifted according to the background of more distant stellar objects.
France Dernières Nouvelles, France Actualités
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