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In the news, NASA plans to use the sun as a gravitational lens to image exoplanets. In fact, this plan has been proposed in 2017 [1]. Some people think this is a good novel idea, and some colleagues who study orbital dynamics question that such observations are unrealistic. But this news reminds me of an equally novel report I heard many years ago.
General relativity points out that light deflects in the gravitational field [2]. Therefore, an observation test of general relativity is the deflection of starlight passing near the sun. Until now, astronomers are still measuring the deflection of the sun to the electromagnetic wave, but they are no longer observing the position of the star, but observing the position of the radio source through very long baseline interference [3].
Light deflected by the gravitational field of celestial bodies is a common phenomenon in astronomy, including the strong gravitational lens created by well-known galaxies or galaxy clusters and the micro gravitational lens produced by planets (or some unknown celestial bodies). Naturally, the sun can also be used as a gravitational lens. The hot news a while ago is that NASA plans to use the sun as a gravitational lens to image exoplanets [4].


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