The signal problem

If a signal is out there, how do we catch it?

01

We don't know where it will come from.

A signal could arrive from virtually any direction in the sky. A telescope watching one star at a time may simply be looking somewhere else.

SAINT’s answer: Watch wide
02

We don't know when it will arrive.

A signal could reach Earth tonight, next month or years from now. There may be no opportunity to ask the sender to transmit again.

SAINT’s answer: Watch continuously
03

We may have very little time to receive it.

A tightly focused laser beam can cross Earth quickly. If the signal contains encoded information, high temporal resolution is needed to record its structure.

SAINT’s answer: Record fast
To search for a signal we cannot predict, we need to watch as much of the sky as possible, as continuously as possible, with enough temporal resolution to preserve the information it may contain.
Why light?

Why search for laser signals?

Laser communication is one plausible way an advanced civilization could transmit large amounts of information across interstellar distances. A powerful, tightly directed optical beam can concentrate energy toward its intended receiver while supporting extremely high data rates.

If such a beam crosses Earth, its artificial nature may be revealed not only by its brightness or wavelength, but by its temporal structure — the pattern in which information is encoded.

Distant civilization
Encoded laser transmission (high data rate)
Beam may cross Earth only briefly
Earth
SAINT is designed not simply to detect a flash of light, but to preserve the temporal structure of a potential signal.
Find wide. Focus fast.

From search to signal

SAINT combines wide-field monitoring with rapid follow-up.

01

Search

12 telescopes watch different parts of the sky. Software processes the data in real time.

02

Detect

A candidate optical signal is identified and characterized by our pipeline.

03

Repoint

The array reacts within seconds, rapidly turning toward the candidate source.

04

Study

All telescopes focus on the signal. We record at up to 1,684 frames per second, with photometric, spectral and polarization data.

The observatory

The SAINT telescope

SAINT consists of 12 independently mounted 30 cm telescopes. It is designed for wide-field monitoring, rapid repointing and high-speed follow-up observations.

12 × 30 cm telescopes
468 deg² combined field of view
54 fps wide-field monitoring
up to 1,684 fps targeted observation
up to 50°/sec repointing speed
Real-time data processing
All sky. All time.

A global network for continuous coverage

A single SAINT observatory monitors a large part of the sky. To achieve continuous coverage of the entire sky, we plan to build a network of observatories at geographically separated sites.

  • Planned sites
The long-term goal: Continuous coverage of the entire sky. All sky. All time.
More than SETI

A tool for time-domain astronomy

The same capabilities that make SAINT suitable for optical SETI also open a largely unexplored region of time-domain astronomy.

Gamma-ray bursts Fast optical emission
Fast radio burst counterparts Millisecond timescales
Gravitational-wave counterparts Transients and follow-up
Other transients From near-Earth objects to distant galaxies
Project roadmap

From concept to a global search network

  1. 01

    Scientific concept & architecture

    Completed
  2. 02

    Detector test

    In progress €65,000
  3. 03

    Assembly of the first telescope

    Next
  4. 04

    First operational SAINT observatory

    Upcoming
  5. 05

    First light & SETI observations

    Upcoming
  6. 06

    Global SAINT network

    Long-term goal
Current campaign

Help us build the next piece of the search.

€177 raised of €65,000
0% €64,823 still needed
Current stage · 2 of 6 Detector test
What we're building

Purchase and testing of a telescope detector (high speed sCMOS camera).

Why it's needed

Determine the actual characteristics of the detector.

What this unlocks

Create the final telescope design based on the test results.

Donate now Discuss a major contribution

Interested in institutional partnership or significant support? Let's talk.

Published research

The SAINT instrument concept was developed by an international team and published in the peer-reviewed journal Photonics in 2023.

We don't know where a signal will come from. We don't know when it will arrive. So we need to be watching.

SAINT — all sky. All time.