The comet’s luminosity
The comet's luminosity

The comet’s luminosity

The fate of a rare cosmic event was found. This is the first time a kind of luminosity has been observed around the comet.

It is known that the same thing happens in the comet that we call ‘aurora‘ or aurora borealis. However, what can be seen very well in the world only on two poles, this time the aurora was seen everywhere in the comet.

Analyzing the images and data sent by the European Space Agency (ESA) spacecraft Rosetta, the traces of this rare cosmic event have been found in the comet ‘7P / Shuryumov-Gerashimenko’. The study was published in the international science journal Nature Astronomy on Monday.

8 years ago today, human civilization touched the first foot in this comet season. However, when landing, the lander ‘Philly’ got stuck in the notch of the comet’s back and became inactive. The device that matched the first traces of the comet 7P / Shuryumov-Gerashimenko’s aurora was built at NASA’s Jet Propulsion Laboratory (JPL). Its name is ‘Microwave Instrument for Rosetta Orbiter (Miro)’.

This is the first aurora anywhere other than planets, satellites

According to the researchers, this is the first time that an aurora-like electromagnetic wave has come out of a cosmic object without a planet or a satellite.

In addition to visible light in the spectrum of light wavelengths and frequencies, there are ultraviolet rays or ultraviolet rays and infrared rays or infrared rays. The frequency of ultraviolet rays is the highest (lowest wavelength) and the frequency of infrared rays is the lowest (maximum wavelength). Just as there are seven colors in visible light, there are also different colors in ultraviolet and infrared rays. However, none of them can be seen with the naked eye.

 

67 P / Shuradyumov-Gerashimenko comet according to the researchers, the light from the aurora seen on the comet 67 P / Suryumov-Gerashimenko is at the far edge of ultraviolet rays (‘far-ultraviolet rays’).

It was on this comet that civilization first set foot

ESA’s Rosetta spacecraft was launched in 2004 to make its first foray into a comet. After 10 years of continuous spaceflight, the Rosetta comet 6P / Shuryumov-Gerashimenko entered orbit in 2014. After that, the lander ‘Philly’ in Rosetta landed on the comet in September 2016.

‘I thought day-glow, then broke the mistake’: Marina Galand

“We thought the first incident was just a day-glow,” lead researcher Marina Galand of Imperial College London told Anandabazar Digital. When the sun shines during the day, the comet gas particles filled with ice, rocks, and various gases become excited. When it returns to normal, the gas radiates. This is the ‘day-glow’. But later, by analyzing the information provided by NASA’s other equipment in Rosetta, we broke the mistake. Understand that it is not a day-glow at all. That’s the aurora. Ultraviolet rays. Which surrounds the entire comet like a luminosity. It can be seen everywhere on the comet. Ultraviolet rays are not visible to the naked eye like the aurora of the earth.

Marina also said by telephone that the discovery would help better understand in the coming days how the particles in the solar system change over time as they travel a long way through space. How they change after reaching a planet, satellite, or any other cosmic object. This will make it easier to predict space weather in the future. Which could save various parts of the spacecraft from being damaged by artificial satellites orbiting different planets in the coming days. Can also save astronauts going to the moon and Mars.

 

Why is the polar light on earth?

At every moment, solar wind is blowing out of the sun and rushing to all corners of the solar system, including the earth. This solar atmosphere contains very strong solar particles. Those that collide with particles in the upper layer of the atmosphere of a planet or satellite at once. It benefits those planets or satellites. If our atmosphere could not resist these solar particles, it would be impossible for life to survive on Earth. These solar particles have an electric charge (‘charge’). The result is a magnetic field. So when these solar particles collide with a planet (such as Earth) that has a fairly strong magnetic field, electromagnetic waves like light are born. Earth’s magnetic field is the strongest at its two poles. So this aurora or polar light can be seen in the north and south poles of the earth. Which we call ‘Northern Lights’ and ‘Southern Lights’ respectively. Which can be seen in different colors of white, green, red, purple, or a mixture of them.

Here too the feet of civilization. 67 P / Shuradyumov-Gerashimenko comet

The same thing happens with planets like Jupiter, Mars, Saturn, Uranus, and Neptune, which have more or less the same atmosphere. Aurora is also seen on the moons of Jupiter and Saturn. But this is the first time that the aurora’s trajectory has been found in any other cosmic object like a comet other than a planet or satellite.

Why the aurora across the entire comet?

Gautam Chattopadhyay, a senior scientist at NASA‘s JPL, says the first Aurora trail on the comet was made by two NASA-built devices. Comets contain ice, gas, and rocks. When it is far away, the ice freezes. And the closer the comets get to the sun, the more the ice melts and spreads out as water particles.

Choloman Sangbad

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