Starlink is the name of a satellite (opens in new tab) network developed by the private spaceflight company SpaceX (opens in new tab) to provide low-cost internet to remote locations. SpaceX eventually hopes to have as many as 42,000 satellites in this so-called megaconstellation.
The size and scale of the project flusters astronomers, who fear that the bright, orbiting objects will interfere with observations of the universe (opens in new tab), as well as spaceflight safety experts who now see Starlink as the number one source of collision hazard in Earth's orbit. In addition to that, some scientists worry that the amount of metal that will be burning up in Earth's atmosphere as old satellites are deorbited, could trigger unpredictable changes to the planet's climate.
Starlink:The satellite internet plan(opens in new tab)
SpaceX's satellite internet proposal was announced in January 2015. Though it wasn't given a name at the time, CEO Elon Musk said that the company had filed documents with international regulators to place about 4,000 satellites in low Earth orbit.
"We're really talking about something which is, in the long term, like rebuilding the internet in space," Musk said during a speech in Seattle when revealing the project. (Musk also owns electric car company Tesla, but Tesla does not produce satellites.)
Musk's initial estimate of the number of satellites soon grew, as he hoped to capture a part of the estimated $1 trillion worldwide internet connectivity market to help achieve his Mars colonization vision. The U.S. Federal Communications Commission (FCC) has granted SpaceX permission to fly 12,000 Starlink satellites, and the company has filed paperwork with an international regulator to loft up to 30,000 additional spacecraft.
To put that into perspective, as of Jan. 5 2022, 12,480 satellites have been launched in all of history with only 4,900 still active, according to the European Space Agency (opens in new tab).
SpaceX launched its first two Starlink test craft, named TinTinA and TinTinB, in February 2018. The mission went smoothly. Based on initial data, the company asked regulators for its fleet to be allowed to operate at lower altitudes than originally planned, and the FCC agreed (opens in new tab).
The first 60 Starlink satellites launched on May 23, 2019, aboard a SpaceX Falcon 9 rocket. The satellites successfully reached their operational altitude of 340 miles (550 kilometers) — low enough to get pulled down to Earth by atmospheric drag in a few years so that they don't become space junk once they die.
Starlink service costs and service
SpaceX has a dedicated website to order Starlink terminals. Go to the main page (opens in new tab) of the Starlink website and scroll down to the section that says "Order Now."
After plugging in your service address, you can see whether Starlink is available for your region. Note that there may be shipping delays due to ongoing supply chain issues associated with the pandemic.
While pricing varies by region, a search for an address in Brooklyn in April 2022 gave a hardware price of $599.00, a one-time shipping and handling charge of $50.00, and a monthly service charge of $110.00.
Speeds are said to be much faster for many users in rural regions compared to local options, although again, this varies by region. "Users can expect to see download speeds between 100 Mb/s and 200 Mb/s, and latency as low as 20ms in most locations," the home page states.
Once your box arrives, you should see within it a Starlink kit (opens in new tab) that will allow you to connect to the Internet. A Starlink app, as well as a website user guide, are meant to guide you through the installation.
The company says that nearly anybody with a clear region of the sky visible should be able to find a satellite, although those very close to the north and south poles might be out of luck.
"Starlink is ideally suited for areas where connectivity has been unreliable or completely unavailable," the Starlink main page states. "People across the globe are using Starlink to gain access to education, health services and even communications support during natural disasters."
More information about Starlink setup, along with answers to frequently answered questions, are available on the customer service page (opens in new tab).
How Starlink satellites work
The current version of each Starlink satellite weighs 573 lbs. (260 kilograms) and is, according to Sky & Telescope magazine (opens in new tab), roughly the size of a table.
Rather than sending internet signals through electric cables, which must be physically laid down to reach far-flung places, satellite internet works by beaming information through the vacuum of space, where it travels 47% faster than in fiber-optic cable, Business Insider (opens in new tab) reported.
Current satellite internet works using large spacecraft that orbit 22,236 miles (35,786 km) above a particular spot on Earth. But at that distance, there are generally significant time delays in sending and receiving data. By being closer to our planet and networking together, Starlink’s satellites are meant to carry large amounts of information rapidly to any point on Earth, even over the oceans and in extremely hard-to-reach places where fiber-optic cables would be expensive to lay down.
Musk has said that the Starlink network would be able to provide "minor" internet coverage after 400 spacecraft were up and running, and "moderate" coverage after about 800 satellites became operational.
As of early January 2022, SpaceX had launched more than 1,900 Starlink (opens in new tab)satellites overall. The constellation is now providing broadband service in select areas around the world, as part of a beta-test program (opens in new tab) with download speeds of between 100 Mb/s and 200 Mb/s and latency as low as 20 milliseconds, according to a Starlink guide (opens in new tab).
Users on the ground access the broadband signals using a kit sold by SpaceX. The kit contains a small satellite dish with mounting tripod, a wifi router, cables and a power supply, according to the company's website (opens in new tab).
Starlink versus astronomy
Within days of the first 60-satellite Starlink launch, skywatchers spotted a linear pearl string of lights as the spacecraft whizzed overhead in the early morning. Web-based guides showed others how to track down the spectacular display.
"This was quite an amazing sight, and I was shouting 'Owowowow!' when the bright 'train' of objects entered into view," Netherlands-based satellite tracker Marco Langbroek told Space.com in 2019 via email. "They were brighter than I had anticipated."
That brightness was a surprise to almost everyone, including both SpaceX and the astronomical community. Researchers began to panic and shared photos of satellite streaks in their data, such as this one (opens in new tab) from the Lowell Observatory in Arizona.
They expressed particular concerns about future images from highly sensitive telescopes such as the Vera Rubin Observatory (formerly known as the Large Synoptic Survey Telescope), which will study the entire universe in exquisite detail and is expected to come online in 2022. Radio astronomers are also planning for interference from Starlink's radio-based antennas.
The International Astronomical Union (IAU) expressed concerns in a statement (opens in new tab) released in June 2019. "Satellite constellations can pose a significant or debilitating threat to important existing and future astronomical infrastructures, and we urge their designers and deployers as well as policy-makers to work with the astronomical community in a concerted effort to analyze and understand the impact of satellite constellations," the statement said.
In April 2021, Thomas Schildknecht, the deputy director of the Astronomical Institute of the University of Bern, who represents Switzerland in the IAU, said at the European Space Agency's space debris conference that the union was calling on the United Nations to protect pristine night sky as cultural heritage against the uncontrolled expansion of megaconstellations.
In a report released in October 2022, the American Astronomical Society (ASS) likened the impact of megaconstellations on astronomy to light pollution. The report said the sky may may brighten by a factor of two to three due to diffuse reflection of sunlight off the spacecraft.
Starlink as a major source of orbital collision risk
SpaceX received more backlash in September 2019, when the European Space Agency (ESA) announced that it had directed its Aeolus satellite to undertake evasive maneuvers and avoid crashing into "Starlink 44," one of the first 60 satellites in the megaconstellation. The agency took action after learning from the U.S. military that the probability of a collision was 1 in 1,000 — 10 times higher than ESA's threshold for conducting a collision-avoidance maneuver.
In August 2021, Hugh Lewis, the head of the Astronautics Research Group at the University of Southampton, U.K. and Europe's leading space debris expert, told Space.com that Starlink satellites represent the single main sources of collision risk in low Earth orbit.
According to computer models, at that time, Starlink satellites were involved every week in about 1,600 encounters between two spacecraft closer than 0.6 miles (1 kilometer). That's about 50% of all such incidents. This number rises with every new batch of satellites launched into space. By the time Starlink deploys all 12,000 satellites of its first-generation constellation it could reach 90%, Lewis said.
Lewis also expressed concerns that Starlink's operator SpaceX, a newcomer into the satellite business, is now the single most dominant player in the field whose decisions can affect safety of all operations in low Earth orbit.
Starlink's effects on the atmosphere
SpaceX plans to refresh the Starlink megaconstellation every five years with newer technology. At the end of their service, the old satellites will be steered into Earth's atmosphere where they will burn up. That is certainly commendable when it comes to space debris prevention, however, there is another problem.
The vast amount of satellites that will be burning in the otherwise pristine upper layers of the atmosphere could actually alter the atmospheric chemistry and have unforeseen consequences for life on the planet.
In a paper published in May 2021 in the journal Scientific Reports (opens in new tab), Canadian researcher Aaron Boley said the aluminum the satellites are made of will produce aluminum oxide, also known as alumina, during burn-up. He warned that alumina is known to cause ozone depletion and could also alter the atmosphere's ability to reflect heat.
"Alumina reflects light at certain wavelengths and if you dump enough alumina into the atmosphere, you are going to create scattering and eventually change the albedo of the planet," Boley told Space.com.
That could lead to an out-of-control geoengineering experiment, a change in the Earth's climate balance. The effects of such alternations are currently unknown.
Karen Rosenlof, an atmospheric chemistry expert at the National Oceanic and Atmospheric Administration (NOAA), told Space.com she too was concerned about the effects of the particles from the burning satellites in the atmosphere. Rosenlof actually has expertise in modelling the effects of geoengineering interventions.
David Fahey, the Director of NOAA's Chemical Sciences Laboratory, and Martin Ross, a physics and meteorology scientist at the Aerospace Corporation, both told Space.com that more research is urgently needed to understand the effects of burning increasing amounts of satellites in the atmosphere.
The problem, the scientists said, is that in those high layers of the atmosphere, the particles are likely going to stay forever.
Boley said that while the amount of satellites burning in the atmosphere will be considerably smaller than the amount of meteorites, the chemical composition of the artificial objects is different, thus the presence of the products of their burning is something scientists know nothing about.
"We have 54 tonnes (60 tons) of meteoroid material coming in every day," Boley said. "With the first generation of Starlink, we can expect about 2 tonnes (2.2 tons) of dead satellites reentering Earth's atmosphere daily. But meteoroids are mostly rock, which is made of oxygen, magnesium and silicon. These satellites are mostly aluminum, which the meteoroids contain only in a very small amount, about 1%."
As the accumulation of those particles would increase over time, so would the intensity of the effects. It thus cannot be ruled out that over decades the pollution from burning megaconstellation satellites could lead to changes on a scale akin to what we are currently experiencing with fossil-fuel-induced climate change.
"Humans are exceptionally good at underestimating our ability to change the environment," said Boley. "There is this perception that there is no way that we can dump enough plastic into the ocean to make a difference. There is no way we can dump enough carbon into the atmosphere to make a difference. But here we are. We have a plastic pollution problem with the ocean, we have climate change ongoing as a result of our actions and our changing of the composition of the atmosphere and we are poised to make the same type of mistake by our use of space."
Starlink did not respond to Space.com requests for comment.
What SpaceX plans to do
SpaceX has stated that it will work with organizations and space agencies to mitigate the impacts of its megaconstellation. And the company has tried to assuage astronomers' concerns over Starlink's effect on the night sky.
"SpaceX is absolutely committed to finding a way forward so our Starlink project doesn't impede the value of the research you all are undertaking," Patricia Cooper, SpaceX's vice president of satellite government affairs, told astronomers at a January 2020 meeting of the American Astronomical Society in Honolulu, Nature reported (opens in new tab).
SpaceX has taken action to this effect. For example, recently launched Starlink satellites sport visors designed to prevent sunlight from glinting too brightly off their most reflective parts.
But the huge numbers of satellites in megaconstellations from SpaceX and other private space companies, such as OneWeb, suggest that light-pollution and other issues may continue, and advocates have called for greater regulations from government agencies.
"Here is a gift for the leaders of the world, a task more non-partisan than any other which has come before: protect our skies," stargazer Arwen Rimmer wrote in The Space Review, a weekly online publication devoted to essays and commentary about space, in early 2020.
Starlinks lost in 2022 solar storm
On Feb. 3, 2022, a SpaceX Falcon 9 rocket made a routine and successful launch of 49 Starlink satellites from NASA's Kennedy Space Center in Florida. But only a day later, a geomagnetic storm above Earth pushed up the density of the atmosphere, increasing the drag on the satellites and dooming the bulk of them to an early death.
"Preliminary analysis show the increased drag at the low altitudes prevented the satellites from leaving safe mode to begin orbit-raising maneuvers, and up to 40 of the satellites will reenter or already have reentered the Earth’s atmosphere," SpaceX wrote in an update (opens in new tab) Feb. 8.
Each satellite was put into a low initial orbit that had a minimum altitude as little as 130 miles (210 kilometers) above Earth, at the orbit's lowest point. SpaceX has said it intentionally releases Starlink batches into such an orbit to allow for quick disposal, just in case something goes wrong during launch. But this positioning also leaves satellites vulnerable to solar activity that affects Earth's atmosphere.
"In fact, onboard GPS suggests the escalation speed and severity of the storm caused atmospheric drag to increase up to 50 percent higher than during previous launches," SpaceX wrote in its update.
The company tried to save them, by placing all the satellites in a a protective "safe mode" and commanding them to fly edge-on "like a sheet of paper" to minimize drag. SpaceX also spoke directly with the U.S. Space Force and the company LeoLabs to track the machines with ground-based radar, it added.
Ultimately, however, most of that Starlink batch was lost. SpaceX noted the upshot is the satellites "pose zero collision risk with other satellites and by design demise upon atmospheric reentry." That latter part means the satellites won't generate any debris that hits the ground.
"This unique situation demonstrates the great lengths the Starlink team has gone to ensure the system is on the leading edge of on-orbit debris mitigation," SpaceX added.
Starlink in Tonga and Ukraine
On Feb. 26, 2022, two days after Russia invaded Ukraine in an unprovoked attack, Ukraine's Vice Prime Minister Mykhailo Fedorov asked Elon Musk for aid (opens in new tab).
Federov's tweet pleading for Starlink terminals resulted in a shipment coming in just two days later, which was incredible given supply chain disruptions and other issues induced by the conflict.
In reality, however, SpaceX was already working behind the scenes on a Ukraine delivery for six weeks. It was awaiting final permission to enter the country and took Federov's tweet as that permission, given the official paperwork wasn't able to get through in time.
SpaceX worked on this initiative in concert with the United States Agency for International Development (USAID). According to a USAID press release (opens in new tab) in April 2022, the public-private partnership has sent 5,000 Starlink terminals to the country, which remains under attack as of this writing on April 12.
The situation in Ukraine was not always smooth, as Musk noted in March 2022 that the Starlink terminals have been jammed near Ukraine conflict areas. The company was already working on an upgrade when Musk announced this, and he pledged a further pivot to cyber defense to keep the Starlinks operational.
Also in February 2022, Musk and SpaceX sent at least 50 Starlink terminals to the island nation of Tonga in the Pacific Ocean. The goal was to give its residents free Internet access, especially in remote villages.
Tonga needed the terminals after suffering a massive volcano eruption and tsunami in January, according to Reuters (opens in new tab). At the time, SpaceX said the terminals will allow for communications to flow in some of the regions with the worst effects due to the eruption.
- Watch this video describing the Starlink satellite project (opens in new tab), from SpaceX.
- Read how astrophysicist Ethan Siegel thinks SpaceX can fix the damage Starlink satellites are causing to astronomy, published in Forbes (opens in new tab).
- Follow the #starlink hashtag on Twitter to catch the latest news and opinions about Starlink.
NOIRLab, Report of the SATCON2 Workshop: Executive Summary, July 16, 2021 https://noirlab.edu/public/media/archives/techdocs/pdf/techdoc031.pdf
Boley, A., Byers, M. Satellite mega-constellations create risks in Low Earth Orbit, the atmosphere and on Earth, Scientific Reports, 20 May, 2021 https://www.nature.com/articles/s41598-021-89909-7 (opens in new tab)
McDowell, J. The Low Earth Orbit Satellite Population and Impacts of the SpaceX Starlink Constellation, The Astrophysical Journal Letters, April 6 2020 https://iopscience.iop.org/article/10.3847/2041-8213/ab8016/meta
Massey R. et al. The challenge of satellite megaconstellations, Nature Astronomy, 6 November, 2020
https://www.nature.com/articles/s41550-020-01224-9 (opens in new tab)
This article was updated on April 12, 2022 by Space.com contributor Elizabeth Howell