NASAのインスタグラム(nasagoddard) - 12月14日 07時03分

These two images, taken by @nasahubble, capture comet 2I/Borisov blazing though our solar system on its way back into interstellar space. It's only the second interstellar object known to have passed through the solar system.
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[1] The comet appears in front of a distant background spiral galaxy. The galaxy's bright central core is smeared because Hubble was tracking the comet. Comet Borisov was approximately 203 million miles from Earth in this image.
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[2] Hubble revisited the comet shortly after its closest approach to the Sun, where it received maximum heating after spending most of its life in frigid interstellar space. The comet also reached a breathtaking maximum speed of about 100 thousand miles per hour. Comet Borisov is 185 million miles from Earth in this photo, near the inner edge of the asteroid belt but below it.
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[3] Path of comet 2I/Borisov.

Credit: Credits: NASA, ESA and D. Jewitt (UCLA)

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