ESO / M. Kornmesser
Our first view of a rock from beyond our solar system was fleeting. Astronomers spotted the object, later called ‘Oumuamua, in October 2017, and it was quickly too distant for Earth-based telescopes to spot.
In late November 2017, researchers pointed the Spitzer Space Telescope towards where ‘Oumuamua should have been and stared for more than 30 hours. It saw nothing.
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Immediately, the researchers wondered whether that was because of ‘Oumuamua’s strange acceleration – astronomers using the Hubble Space Telescope had found that it …