Thursday, May 1, 2025

Space & Physics: The new satellite war is clogging low-Earth orbit

May 1—This week, the troubling repercussions of Earth's skyrocketing numbers of satellites, the gnarly implications of evolving dark energy, the surprising possibilities for sound in space, and more. Enjoy!

Lee Billings, Senior Editor, Space and Physics


Amazon has launched its first operational Project Kuiper satellites in its attempt to compete with SpaceX's Starlink—but experts remain concerned about space debris and astronomy

On Monday, Amazon launched its first batch of operational Project Kuiper satellites in its attempt to compete with SpaceX's Starlink for providing fast and reliable internet connectivity across the globe.

While the advent of more competition in the rarefied realm of space-based communications might be good for consumers, the surging numbers of satellites orbiting Earth could be very bad in myriad disturbing ways. As our top story notes, when the first Starlink batch launched in 2019, there were about 2,000 satellites in orbit; today, thanks to that SpaceX project and other mega constellations, there are more than 11,000. And this remarkable trend of growth seems destined only to accelerate.

More satellites mean more "space traffic" to manage—more crowded orbits, more near-misses to avoid, and, sooner or later, more actual collisions that produce hazardous cascades of debris. Some of this debris risk can be mitigated by deliberately deorbiting defunct satellites to burn up in Earth's atmosphere, but even then the massive influx of vaporized metals and plastic into the air can frightfully degrade vital things like our planet's protective ozone layer. Even leaving all that aside, swelling numbers of satellites will also unavoidably interfere with all sorts of astronomical observations that depend on clear, dark skies. And, perhaps worst of all, regulatory frameworks that might rein in the worst excesses of mega constellations are relatively threadbare, fostering a laissez-faire approach that could prove profoundly damaging in the longer term.

Simply put, thanks to mega constellations Earth's orbital environment is now undergoing dramatic change. Could the escalating situation reach a breaking point? And if so, when? What's at stake—and is the push for ubiquitous satellite-based connectivity worth what could be some very high environmental costs? Read our top story to find out more. —Lee Billings

Top Stories
Latest Dark Energy Study Suggests the Universe Is Even Weirder Than We Imagined

If dark energy is weakening, as suggested by recent results, then the cosmos is far stranger than most physicists had supposed

Giant, Glowing Gas Cloud Discovered Just 300 Light-Years Away

An enormous glowing cloud that contains approximately 3,400 solar masses worth of gas has been discovered near the solar system

Can There Be Sound in Space?

It seems contrary to common knowledge, but sound can travel through some parts of space quite well

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Celebrate Hubble Space Telescope's 35th Birthday with Stunning Images

Happy anniversary to the Hubble Space Telescope, which launched on April 24, 1990

This Cutting-Edge Encryption Originates in Renaissance Art and Math

The mathematics underpinning the modern method of elliptic curve cryptography originated with Renaissance architect Filippo Brunelleschi

Prime Number Mystery Is Key to Magic: The Gathering Card Game Strategy

The popular fantasy card game Magic: The Gathering has a new card related to prime numbers. Now fans are trying to use it to tackle one of the biggest problems in mathematics

Solar Shadow Play, Seances for Science, and More from Our 1925 Coverage

We present a historical romp through Scientific American—100 years ago.

What We're Reading
  • NASA's Psyche spacecraft hits a speed bump on the way to a metal asteroid. | Ars Technica
  • The chance detection of an ultra-energetic neutrino could illuminate the strangest corners of the cosmos. | New Scientist
  • Scientists used fluid dynamics to study the physics of perfecting pour-over coffee. | New York Times

From the Archive
A New, Deadly Era of Space Junk Is Dawning, and No One Is Ready

A Saskatchewan farmer's near miss with potentially lethal debris falling from orbit highlights the skyrocketing risks and murky politics of space junk

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