Over 500,000 satellites are expected by 2040, and they may interfere with space telescope photos

Space is getting crowded faster than expected

Space is filling with satellites far faster than most people realize. The number of satellites in orbit has grown from a few thousand a few years ago to about 15,000 today, and planned deployments suggest the total could reach roughly 560,000 by 2040, depending on which proposals move forward.

That is fantastic for global internet coverage and navigation, but there is a hidden cost. Those identical satellites are now photobombing the universe for astronomers.

Astronomers realize space telescopes are not safe

New simulations show that some space telescopes that were assumed to be relatively protected could be significantly affected by sunlight reflected from very large satellite constellations.

A recent study led by researchers, including NASA astrophysicist Alejandro Borlaff, models how dense low Earth orbit constellations could contaminate images from Hubble, NASA’s SPHEREx mission, ESA’s ARRAKIHS concept, and China’s planned Xuntian telescope and finds substantial image contamination in the modeled scenarios.

Scientists simulate how satellites hit key observatories

Researchers modeled four key observatories to understand how half a million satellites might impact science images. They focused on the Hubble Space Telescope, NASA’s new SPHEREx mission, Europe’s planned ARRAKIHS survey telescope, and China’s future Xuntian observatory.

By simulating satellite traffic across their fields of view, they could estimate how often bright streaks would slice through exposures and contaminate precious data.

Hubble still suffers from growing satellite streaks

The results for Hubble are worrying but not catastrophic. The simulations indicate that about 39.6 percent of Hubble exposures would contain at least one satellite trail under the modeled megaconstellation scenario.

A meaningful share of the images appear to be affected in subtle ways, leaving researchers to spend extra time sorting signal from noise.

Over the years, that adds up to a steady burden on teams already working at the limits of what the data can reveal, where every bit of usable information matters.

Survey telescopes face a flood of satellite trails

For the next generation of survey missions, the news is much worse. SPHEREx, ARRAKIHS, and Xuntian are designed to scan vast areas of sky in every exposure, which makes them far more likely to cross satellite highways.

The study finds that more than 96 percent of exposures for wide field missions would include at least one sun-illuminated satellite trail in the dense projections used in their models.

Satellite streaks quietly erase vital science signals

A satellite trail is not just an unappealing scratch that editors crop out at the last minute; it is a distinct feature that remains visible.

Those bright lines can hide faint asteroids, blur the subtle dimming of stars that hints at the presence of exoplanets, and introduce noise into measurements that track how galaxies evolve.

Long exposures used to detect faint objects can be permanently degraded by a satellite trail, and the lost signal cannot be recovered by post-processing in many cases, so the scientific cost can be high.

The satellite boom is accelerating faster than predicted

Part of what makes this so alarming is the speed of the satellite boom. Astronomers recall that spotting a single spacecraft in a night’s worth of images felt novel.

Now, thanks to megaconstellations for broadband and navigation, thousands of spacecraft constantly cross the same orbital shells that telescopes use. Launch costs continue to fall, prompting commercial operators to rush to occupy every available altitude.

Ideas to limit satellite harm face complex realities

Astronomers and satellite companies are debating the feasibility of realistic mitigation. One idea is to cap the highest orbits of prominent constellations, allowing space telescopes to sit above the swarm.

Maintaining accurate orbital catalogs and sharing ephemerides with observatories could reduce collisions with satellite trails for scheduled observations.

Placing telescopes farther away is one escape route

Some researchers argue that instead of squeezing telescopes between satellite shells, we should push observatories even farther out into space.

One option is to place observatories well beyond low Earth orbit. For example, the James Webb Space Telescope and NASA’s Nancy Grace Roman Space Telescope operate near the Sun-Earth L2 point, well beyond LEO, and so are far less vulnerable to LEO satellite trails.

Researchers question and refine the darkest forecasts

Not everyone agrees with the most pessimistic simulations, and that tension matters. Teams behind missions like ARRAKIHS point out that they will spend much of their time looking away from Earth, where satellite density is lower.

Their own models suggest smaller amounts of contamination per image. Even so, they acknowledge that megaconstellations are now a severe design constraint for new instruments.

Satellite networks bring benefits that complicate regulation

The satellite surge is not happening in a vacuum. Constellations promise faster internet for remote communities, better climate monitoring, and new commercial services.

That creates real social and economic value, which is why regulators have been slow to impose strict limits. The challenge is to ensure that these benefits do not quietly erode our ability to study the universe with clarity.

Our cultural connection to the night sky is at risk

Beyond pure science, a cultural loss is at stake. Streak-filled long exposure photos already show how satellite trains cut through Milky Way vistas and even bright comets.

Astronomers worry that if we normalize a sky crowded with artificial lights, future generations may never experience a truly dark, star-rich night. The night sky has always been a shared heritage.

And if you want to see the latest launch lighting up the skies, take a look at SpaceX’s launch carrying 24 satellites, which thrills viewers in California.

There is still time to protect both sky and service

Researchers say we still have a window of opportunity to act before the worst projections become a reality.

More brilliant satellite designs, better coordination between companies and observatories, and thoughtful orbital limits could keep astronomy viable without freezing innovation.

If we treat low Earth orbit as a shared ecosystem rather than a land rush, we can keep both global connectivity and our clear view outward.

And if you want to see another major issue unfolding in orbit, take a look at Satellites expose massive data leak involving T-Mobile and major networks.

What do you think about the expected number of satellites that are set to be in space, which can cause numerous difficulties, including issues with space photography? Please share your thoughts and drop a comment.

This slideshow was made with AI assistance and human editing.

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