SCIENCE COUNTDOWNS / ESA / PLATO
The next planet hunter opens 26 eyes
Plato will look for small planets around bright stars, where a planet's size is only part of the story.
Until the planned launch month begins
WHERE THE MISSION STANDS
The threshold ahead.
The European Space Agency's Plato mission is planned to travel to an orbit around Sun–Earth L2. Its 26 cameras will measure tiny changes in starlight across a large population of stars, looking for planet transits while also studying the stars themselves. That pairing matters because a planet cannot be understood well if its parent star is poorly measured.
An Earth-size silhouette does not automatically mean an Earth-like world. Stellar properties, planetary orbit, and later follow-up observations are needed before anyone can discuss conditions on the surface. Plato's survey should sharpen the list of worlds worth that closer attention.
WHY THE SCIENCE MATTERS
Questions worth returning for.
How common are small planets in temperate orbits?
Repeated transits can reveal a planet's size and orbital period, including longer periods that resemble our own neighborhood more closely than many short-orbit discoveries.
How old are the systems we find?
Changes in a star's brightness can reveal stellar oscillations. Those patterns help estimate stellar properties and ages, giving the planet discovery a history as well as a size.
Which candidates deserve closer scrutiny?
A transit is an invitation to investigate, not proof of habitability. By targeting bright stars, Plato can help other telescopes measure promising planets in more detail.
CONTINUE THE INVESTIGATION
Follow the thread.
Explore related investigations, Evidence Files, image stories and films.
DATE & SCIENCE SOURCES
ESA currently lists March 2027 as Plato's planned launch month. March 1 is a month marker for this clock, not an announced launch date or time. Launch schedules may change.
Source review: October 2, 2026. Check the mission agency for later schedule changes.THE NEXT FILES
Keep watching.
Hera returns to the DART impact site
A spacecraft changed a moonlet's orbit. Hera goes back to discover what the collision actually did to the asteroid.
Enter the event fileEuclid opens the next map of the dark universe
The DR1-Foundation release brings survey material into public view. The interesting part is what independent researchers can test with it.
Enter the event fileBepiColombo enters Mercury's orbit
After years of flybys and braking, two science orbiters prepare to investigate a small planet with an outsized interior.
Enter the event file