In general, the sun, solar radiation impacts the gases and dust of comets and this reaction causes the gases to become energetically charged and begin to shine depending on what gas it is and also the radiation they receive. They can have one color or another, so it is normal for a comet to change color. In fact, green comets are quite common and this comet called C2025 K1 changed color.
Comet C2025 K1 was initially green and after passing perihelion it changed to an almost gold tone, with some brown nuances, but it has broken into at least three pieces. The image shown is from November 11 to 12, obtained with the Copernicus telescope at the Asiago observatory in Italy.
It is estimated that the nucleus of the comet is 1 km in diameter, it would be smaller than 3IAtlas, so the three pieces that we are seeing, surely the two largest would be about 400 m and the small one perhaps 100 m at most, at most.
The colors of comets depend on the dust, in this case, the golden color was due to silicates, carbon usually produces green tones, at least the diatomic and some other compounds, the topic of colors is a whole world, but it gives a lot of information about the elements that a comet contains and this is essential, for example, in the case of 3I/Atlas, but this one in particular, in addition to having broken into three pieces, has not yet had its closest approach to the Earth, it will be on Tuesday, the 25th. November and will pass 60,300,000 km from us.
It comes from the Oort cloud, the outer part of the solar system, it is one of ours, but it is not going to be forever, it is not going to return or its three pieces are not going to return, they are going to travel through interstellar space, since its eccentricity exceeds one, it is not going to return, it will take thousands of years to leave the solar system, but who knows when it will arrive in millions and millions of years, hundreds of millions, perhaps billions of years to the environment of a star that is populated and with a civilization and see those three pieces, what will you think?
This serves as an example for us, first it will serve as an example for us because of the issue of 3I/Atlas and whether it had to break or not, it had to break and what it means for it to break or not break, but it also serves as an example for you to understand that natural processes also generate interstellar objects, in this case these three fragments.
Some comets come, sometimes from a long journey through the interstellar oceans, as in the case of 3I/Atlas, which lasted more than 7 billion years and others were formed here and are launched by the Sun or by Jupiter or by Saturn and are launched to travel between the stars until practically the end of time.
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