NASAのインスタグラム(nasagoddard) - 4月26日 22時19分

The first interstellar comet, 2I/Borisov, discovered last August, has a higher concentration of carbon monoxide than any comet seen within about 200 million miles (300 million kilometers) of the Sun.
Astronomers worked out the comet’s composition with data from @NASAHubble and the National Radio Astronomy Observatory’s Atacama Large Millimeter/submillimeter Array (ALMA). This suggests to scientists that the comet could have formed around a red dwarf — a smaller, fainter type of star than the Sun — though other kinds of stars are possible. Another idea is that 2I/Borisov could be a carbon monoxide-rich fragment of a small planet from another star system.

Credit: NASA/Space Telescope Science Institute

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