NASAのインスタグラム(nasagoddard) - 3月27日 22時59分

An illustration of ‘Oumuamua, the first object we’ve ever seen pass through our own solar system that has interstellar origins.
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In October, a mysterious object zipped through our solar system at 196,000 mph. Scientists named it ‘Oumuamua, which means “a messenger from afar arriving first” in Hawaiian, and it’s the first object we’ve ever seen that entered from outside our solar system. Now our astrophysicists have helped calculate how it fits into what we know about how planetary systems form.
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On Sept. 19, ‘Oumuamua sped past the Sun at about 196,000 mph (315,400 km/h), fast enough to escape the Sun’s gravitational pull and break free of the solar system, never to return. Usually, an object traveling at a similar speed would be a comet falling sunward from the outer solar system. Comets are icy objects that range between house-sized to many miles across. But they usually shed gas and dust as they approach the Sun and warm up. ‘Oumuamua didn’t. Some scientists interpreted this to mean that ‘Oumuamua was a dry asteroid.
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Read more: https://go.nasa.gov/2GgN2HY
Credits: European Southern Observatory/M. Kornmesser #nasagoddard #space #science #Oumuamua #astonomy #traveler #asteroid #interstellar

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