Launched atop a SpaceX Falcon 9 from Vandenberg Space Force Base on 11 January 2026, NASA’s new Pandora telescope is now in orbit, poised to sharpen the James Webb Space Telescope’s hunt for potentially habitable worlds. Rather than competing with Webb, Pandora has a very specific job: cleaning up the “noise” from distant stars that can make planets look far more Earth-like than they really are.
Why NASA needed Pandora beside James Webb
Over the past decade, the James Webb Space Telescope (JWST) has turned exoplanet science into precision work, dissecting the atmospheres of planets light-years away. Yet astronomers hit an awkward problem: the stars themselves kept getting in the way.
When a planet passes in front of its star, a tiny fraction of starlight filters through the planet’s atmosphere. That light carries signatures of gases such as water vapour, hydrogen and methane. JWST is excellent at reading those signatures, but less good at tracking how unstable and blotchy the parent star can be.
Pandora’s core mission is to separate what belongs to the star from what truly comes from the planet.
Many stars are covered in dark starspots and bright magnetic patches. These features change the star’s brightness and colour over time. From Earth’s perspective, that flickering can mimic or mask the signals scientists are trying to read from a planet’s atmosphere. Some stars even hold water vapour high in their own atmospheres, especially in cooler starspots, tricking instruments into seeing “water” where there might be no planet at all.
The problem Pandora is built to fix
A series of studies in the late 2010s highlighted how serious this issue had become. Researchers showed that stellar activity could skew measurements of small, rocky planets by a large margin. The effect was memorable enough to earn a name: the “transit light source effect”.
Instead of merely refining models, NASA opted to send hardware. Pandora was conceived as a specialised clean-up artist for exoplanet data, designed from the start to work hand-in-hand with JWST and, later, with the Roman Space Telescope.
A compact telescope with a very patient eye
Pandora is a SmallSat, far tinier than Webb and built on a much tighter budget and schedule. It cannot collect as much light, and it will never produce the showpiece images that made JWST famous. Its strength lies somewhere else entirely: it stares. For a very long time.
Where Webb usually samples a target and moves on, Pandora will camp on a handful of carefully chosen stars for more than 200 hours each over the course of a year, revisiting them again and again.
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By tracking subtle, long-term changes in a star’s brightness and colour, Pandora turns “noisy” stars into well-understood light sources.
During these campaigns, Pandora will:
- Monitor a star continuously for up to 24 hours at a time
- Record both visible and infrared light
- Watch starspots rotate into and out of view
- Track how active regions grow, evolve and fade
- Observe planetary transits against this changing backdrop
This double role — watching the star and the transit in the same consistent way — lets scientists correct Webb’s rich but short snapshots with Pandora’s long, steady watch.
How Pandora and JWST will work together
The key to the partnership lies in timing and wavelength coverage. JWST offers exquisitely detailed spectra during a transit, but seldom returns to the same system in exactly the same configuration. Pandora lacks that fine spectral resolution, yet it can build a dense, time-based record of how a star behaves.
| Telescope | Main strength | Main limitation |
|---|---|---|
| James Webb Space Telescope | High-precision spectra of exoplanet atmospheres during transits | Limited long-term monitoring of host stars |
| Pandora | Long, repeated monitoring of stars in visible and infrared light | Smaller mirror, less detailed spectra |
Combining the two data sets should allow astronomers to tell, for example, whether a water signal comes from a humid exoplanet atmosphere, or from water-rich starspots on the host star.
Pandora gives context to Webb’s close-ups, turning cautious hints of habitability into better-tested claims.
A fast, low-cost mission by design
Pandora also marks a cultural shift inside NASA. Rather than a decades-long flagship observatory, it was proposed and built on a compressed schedule, with a smaller budget and a higher tolerance for risk.
The spacecraft was assembled by Blue Canyon Technologies, a company specialising in compact satellites, before being integrated into the SpaceX Falcon 9 that carried it to orbit. This approach trimmed costs but demanded simplicity: fewer moving parts, a focused science goal and streamlined operations.
Once initial checks by Blue Canyon are complete, control will shift to the University of Arizona’s Multi-Mission Operation Center in Tucson. From there, teams will schedule long stares at selected stars, coordinating with JWST and, later, with Roman when possible.
What Pandora could reveal about habitable worlds
Behind the technical language sits a clear ambition: to judge which exoplanets genuinely stand a chance of being habitable. Misreading a star can lead scientists to overestimate the presence of water or clouds, making a dry, airless rock look oddly Earth-like on paper.
With Pandora’s corrections, atmospheric measurements for small planets — especially those near the size of Earth or super-Earths — should become far more reliable. Researchers hope to:
- Sort genuinely water-rich atmospheres from false positives caused by stars
- Measure cloud cover and haze with better confidence
- Compare rocky planets across different types of stars
- Design future missions based on realistic targets, not misleading signals
This matters most for red dwarf stars, which are prime hunting grounds for habitable-zone planets but notoriously active and spotty. Pandora’s long-term monitoring will help quantify just how tricky those stars are to work with.
Key concepts behind Pandora’s mission
What astronomers mean by a “transit”
A transit happens when a planet crosses the face of its star as seen from Earth. The star dims by a tiny fraction. Instruments can measure that dip in brightness, revealing the planet’s size and orbit. When some starlight filters through the planet’s atmosphere, it changes slightly in colour depending on which gases it passes through.
Pandora and JWST both use this approach, known as transit spectroscopy, but with different strengths. JWST reads the fine details in the light. Pandora makes sure the “candle” — the star — is properly understood.
Why stellar activity is such a headache
Starspots are cooler, darker patches on a star’s surface, while bright active regions are hotter and more intense. As the star spins, these features move in and out of view, changing how bright and how red or blue the star looks from Earth.
If that change happens during a planetary transit, the signal from the planet’s atmosphere can be distorted. One scenario that astronomers worry about is a rocky planet appearing to host a thick, water-rich atmosphere simply because the star has water vapour concentrated in its starspots at that moment.
Pandora’s long sequences of observations will help scientists simulate these patterns for each target star. Those simulations can then be fed into models that strip away the stellar effects from Webb’s delicate transit spectra.
What comes next for the search for life
As Pandora settles into its 90-minute orbit around Earth and the initial engineering phase passes, attention will shift quickly to science operations. Early targets are expected to be systems already examined by JWST, where stellar contamination is suspected to be especially strong.
If the approach works as planned, Pandora-style missions could become a standard sidekick for future giant observatories. Instead of just building ever-bigger telescopes, agencies might regularly pair them with nimble, cheaper sentinels that watch the targets in the background, making sure that spectacular-looking signals are not simply tricks of the light.
For anyone following the search for habitable worlds, Pandora adds a less glamorous but crucial ingredient: trust in the measurements themselves. Before claiming hints of life on a distant planet, astronomers want to be sure they have not been fooled by a restless, spotted star — and Pandora is now on orbit, watching those stars with a steady, unblinking gaze.