Spitzer Space Telescope sheds new light on 'Oumuamua … by not being able to see it


Looking at 'Oumuamua in the visible spectrum, scientists concluded that it had to be no larger than half a mile (2,600 feet, or 800 meters) in its longest dimension. But Spitzer works in the infrared spectrum. Using three different mathematical models based on different assumptions about the composition of 'Oumuamua, and assuming that it's a sphere for purposes of calculation, a NASA research team concluded that its actual longest dimension is between 460 and 1,440 ft (140 to 440 m) with an absolute lower limit of 320 ft (100 m).

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