Last year, astronomers announced they’d detected a comet from another solar system: ‘Oumuamua. NASA/ESA/STScI On October 19, 2017, astronomers first saw an object from another solar system traveling through our own. Zipping into our solar system from above, the interloper, now known as 1I/2017 U1 (‘Oumuamua), swung around the Sun and shot away again, never … Continue reading What do we know about ‘Oumuamua?