NASAのインスタグラム(nasa) - 10月18日 06時30分
☄️ Interstellar visitor spotted! ☄️
@nasahubble has given astronomers their best look yet at an interstellar visitor — comet 2I/Borisov — whose speed and trajectory indicate it has come from beyond our solar system. In this Oct. 12, 2019 Hubble image, the comet is 260 million miles from Earth. The comet is following a hyperbolic path around the Sun and will exit back into interstellar space.
Comet 2I/Borisov is only the second such interstellar object known to have passed through the solar system. In 2017, the first identified interstellar visitor, an object officially named 'Oumuamua, swung within 24 million miles of the Sun before racing out of the solar system.
As the second known interstellar object found to enter our solar system, the comet provides invaluable clues to the chemical composition, structure and dust characteristics of planetary building blocks presumably forged in an alien star system a long time ago and far away.
#comet #interstellar #solarsystem #hubble #space #cometborisov
Image Credit: Credit: NASA, ESA and D. Jewitt (UCLA)
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