If the sky is getting brighter and brighter, it’s not because of the stars but because of the mega-constellations of satellites spreading out there. So much so that an astronomer predicts that soon one in fifteen points of light in the night sky will be a satellite. But what does it matter since many of us in urban areas no longer even see the stars illuminating the firmament.
I’m outside on my farm in Saskatchewan chatting with my neighbors who I’ve invited over to look at the skywith my telescope. After the exclamations and the wonder at the and the which has traversed space for more than two million years since the to reach our gaze, our conversation inevitably deviates towards the , our teleworking organization and complaints about in rural area. My neighbor mentions in passing that he has just changed supplier for .
I look up and notice a bright satellite moving across the sky. This is most likely a Starlink, since they now account for almost half of the fewand that they are particularly brilliant. I take a deep breath and think about how to discuss the cost we’re all going to have to pay for Starlink’s internet access.
I do not blame my neighbors for their choice. Here, as in many rural areas of North America, there is noto the Internet, and given that many people are working and studying from home during the pandemic, we want to do everything to make our lives easier.
However, I know how high the cost could be. My article to appear in The Astronomical Journal presents if the satellite companies continue with their current projects. I also know that due to the light geometry of the and chosen, the 50e the northern parallel, where I live, will be the most severely affected part of the world.
In the absence of regulation, I know that in the near future a in the sky will be a satellite moving inexorably, and not . This will be disastrous for astronomical research and completely change the night sky around the world.
In order to determine how much the night sky will be affected by sunlight reflected from future satellite megaconstellations, we designed a to predict the satellites as seen from various places on Earth, at different times of the night and in different . We have also created a based on this simulation.
Simulation of the luminosity and the number of satellites during a complete night for the 50ᵉ north parallel at the summer solstice. © Sam Lawler
According to our research, we will not be able to escape this new light pollution from satellites anywhere on Earth, not even at the North Pole.
At present, it is relatively easy to escape thecity to benefit from a starry sky while camping or going to a chalet, but, according to our research, we will not be able to escape this new satellites anywhere on Earth, not even at the North Pole.
The hardest hit places on Earth will be at 50 degrees north and south, near cities like London, Amsterdam, Berlin, Prague, Kiev, Vancouver, Calgary and my home. At the summer solstice, at these, nearly 200 satellites will be visible at naked all night.
I study the orbital dynamics of the, composed of small bodies that lie beyond . My research is based on wide-field and long-term images exhibition to learn more about the history of our .
Internet by Starlink may seem cheaper than other options in rural areas, but that’s because you . One of them is the atmospheric pollution caused by the hundreds of launches of necessary to build and maintain this system.
Starlink plans to replace each of the 42,000 satellites after five years of operation, which will require de-orbiting an average of 25 satellites per day, or about six tons of material. Theof these satellites will not disappear — it will be disseminated in the upper layers of the . As satellites are mainly composed of d’ , they risk forming particles of by vaporizing in the upper atmosphere, which could destroy and cause global temperature changes.
This question has not yet been studied in depth since low Earth orbit is not subject to any environmental regulations.
rule the sky
At the moment, low Earth orbit, where all these satellites are expected to evolve, is almost unregulated. There are no standards for light pollution, air pollution caused by launches, air pollution caused by re-entry into the atmosphere, and.
These megaconstellations may not be financially viable in the long term, and internet access speeds may drop significantly when many users connect at the same time or if it rains. Yet satellites are being launched at a breakneck pace right now, and the damage they cause to the night sky, the atmosphere, and the safety of low Earth orbit will not be erased, even if the companies go bankrupt.
There is no doubt that in many places people in rural and remote areas have been left behind in the development of Internet access. But there are many other options that do not entail such high costs. We cannot accept the global loss of access to, which human beings have been able to observe and with which they have been able to connect since the beginning of their existence.
If theinstead of competing, there could be far fewer satellites in orbit. Changing the design of the satellites could make them much dimmer, which would lessen their impact on the night sky. We shouldn’t have to choose between astronomy and the Internet.
However, without regulations that require change, or a strongof consumers that demonstrates the importance of the night sky, our vision of will soon be changed forever.