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Why in news?

Deep-space ice formed in one of the coldest parts of the cosmos has been found in our solar system.

21-Borisov was in the news in the past: It was the first such identified interstellar comet to have come close to the Sun from another stellar system.


  • Deep-space ice was carried on a comet that formed far from its host star, where temperatures could reach minus 250 degree Celsius.
  • Named 21/Borisov, the comet 800 metres wide with a tail almost 1,60,934-km long, was spotted just outside the orbit of Mars.
  • Scientists have found the coma- a fuzzy outer layer of light-  contains water and a lot of carbon monoxide.
  • Carbon monoxide, poisonous to humans, is a common gas in space and forms as ice only in the most frigid locations.
  • The presence of so much carbon monoxide suggests 2I/ Borisov was formed — in a very cold outer region of its home star system or around a star cooler than the Sun.

What are Comets?

  • A comet is an icy, small Solar System body that, when passing close to the Sun, warms and begins to release gases, a process called outgassing.
  • This produces a visible atmosphere or coma, and sometimes also a tail.
  • These phenomena are due to the effects of solar radiation and the solar wind acting upon the nucleus of the comet.
  • Comet nuclei range from a few hundred meters to tens of kilometers across and are composed of loose collections of ice, dust, and small rocky particles.
  • The coma may be up to 15 times Earth’s diameter, while the tail may stretch one astronomical unit.
  • Comets have been observed and recorded since ancient times by many cultures.

-Source: The Hindu

November 2023