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" ... In particular, the ASTERIA team wanted to prove that their [size] satellite could aim at a distant, tiny point of light in the sky and hold itself steady enough to measure the tiny changes in light that happen when an exoplanet like 55 Cancri e passes in front of a star. That kind of fine pointing control is vital, because a shift or wobble at the wrong moment could mess up the telescope’s data, making astronomers think they were seeing a dimming star when it was really just a fidgety spacecraft. And it’s been the key challenge for engineers since the very first space telescopes. ... "
" ... This illustration of the Milky Way includes Kepler's original field-of-view for its search. Kepler, ... [+] for its primary mission, surveyed the same part of the sky continuously, allowing it to image more than 100,000 stars at once. When a planetary transit occurred, Kepler would see a periodic dimming of the star's light. ... "
" ... Transits are expected to be rare around white dwarfs, as the odds of getting a serendipitous alignment — where the planet actually passes in front of a small-sized stellar remnant — are very low. Over 1,000 white dwarfs were surveyed by TESS, and WD 1856+534 was the first one to show evidence of this periodic dimming. Based on the data obtained, the planet is very close to the white dwarf, completing an orbit every 1.4 days (34 hours), but being quite large: approximately the size of Jupiter, taking 6-to-8 minutes to complete a full transit. ... "
" ... “We know the first dimming event involved a dust cloud … we found the second smaller event was likely due to the pulsations of the star,” said Joyce. The researchers used hydrodynamic and seismic modelling to learn more about the physics driving its pulsations to see what phase of its life Betelgeuse is in. ... "