Why are fewer and fewer stars seen in the sky of big cities?

Seeing the stars has become a very entertaining activity for many people. Some do it for a particular reason, while others out of simple curiosity, because it is a great spectacle to see them shine in the sky. However, what has attracted attention is that the presence of these celestial bodies large size is getting smaller in several cities. This has caused many to wonder what is happening?

look at the stars in the sky is an activity that everyone has done at some point in their lives. In large cities, celestial bodies cause great astonishment due to their luminosity and more than one dares to photograph them with their cell phones or cameras.

But one of the reasons that has powerfully caught people’s attention is that the stars they are being seen in fewer and fewer years compared to years ago. Although no one has been able to explain this to date, a group of scientists analyzed such a situation.

The investigation carried out explains in detail what is happening in the sky and with these celestial bodies.

In the universe there are millions of stars (Photo: Pixabay)

WHAT ARE THE STARS?

Stars are celestial bodies and, furthermore, cosmic energy engines that have the capacity to produce heat, light, ultraviolet rays, and other forms of radiation.

According to stars are composed of gas (almost entirely) and plasma, which is a superheated state of matter made up of subatomic particles.

Likewise, it specifies that in the universe there could be approximately more than 100 billion galaxies which would be made up of more than 100 billion stars.

These celestial bodies can be of various sizes and are classified from dwarf to giant.

WHY DO YOU SEE LESS STARS IN THE SKY?

This is one of the big questions that many have been asking. In this sense, a group of scientists led by Christopher Kybafrom the German Center for Research in GFZ Geosciences and of the Ruhr University Bochumtogether with colleagues from the GFZ and the NOIRLab of the National Science Foundation (NSF) decided to carry out an investigation in this regard.

The study was published in the specialized magazine “” where it is detailed that the stars are seen less and less in the big cities because the sky is shining a little more. The specialists considered that the artificial brightness of the night sky is a form of light pollution.

The number of visible stars decreased by an amount that can be explained by an increase in sky brightness of 7 to 10% per year in the human visible band.“, accurate.

The meteor shower (Photo: Pixabay)

The meteor shower (Photo: Pixabay)

HOW WAS THIS STUDY DONE?

This research was conducted from 2011 to 2022 for which it was required 51,351 observations of citizen scientists of stellar visibility with the naked eye.

In the article of ““Experts detail that this global change, over time, is not well known, since “Advances in lighting technology complicate any measurement due to changes in lighting practices and emission spectra”.

We attribute this difference to spectral changes in light emission and to the mean angle of light emissions.”I note.

HOW WAS THE BRIGHTNESS OF THE SKY CALCULATED?

according to a global model was made, managing to determine the change in the brightness of the sky and it had the support of observers located in different parts of the world for several years.

“Skyglow grew exponentially for much of the 20th century as a result of population growth, settlement expansion, and the deployment of new lighting technologies”says Christopher Kyba.

That is why the researchers concluded that the change in the number of stars that can be observed is due to the increase in the sparkle of night sky.

BRIGHTNESS OF THE SKY IN THE WORLD

  • Europe – Increased sky brightness by 6.5%.
  • North America – Increased sky brightness by 10.4%.
stars.  (Photo: Pixabay)

stars. (Photo: Pixabay)

MORE INFORMATION ABOUT STARS

HOW MANY YEARS DOES A STAR LIVE?

According to , the life cycle of a star lasts billions of years. It also ensures that the bigger a star is, its lifetime will be much shorter.

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