Using data from NASA's TESS mission and networks of ground-based telescopes, astronomers think that a massive dust cloud surrounds one of a pair of stars.
by looking for tiny, rhythmic dips in the brightness of a star — dips caused by a planet passing in between the telescope and the star, blocking a smidge of its light.
Taken together, all this data let scientists piece together a picture of what might be causing the strange signal. The researchers suspect that at the heart of TIC 400799224 is a binary star in which two similar stars circle each other. But one of those stars appears to be pulsing every 19.77 days, causing the more complicated patterns; that pulsing, the astronomers argue, is caused by a massive cloud of dust surrounding the star.
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