EXOPLANETS • SKY SURVEYS • TESS
TESS Maps a Sky of Other Worlds
96 observing sectors, one mosaic—and a useful lesson in how discoveries become confirmed.
ADDED OCTOBER 27, 2026 • NASA RELEASE MAY 13, 2026 • OBSERVATIONS THROUGH SEPTEMBER 2025
A dated discovery snapshot
NASA assembled this mosaic from 96 TESS sectors observed between April 2018 and September 2025. Its markers show 679 confirmed exoplanets in blue and 5,165 candidates in orange. These are the release’s historical counts, not live October 2026 totals.
How TESS searches
TESS uses four cameras to monitor a sector for roughly a month, measuring changes in stellar brightness. Repeated dips can reveal a planet passing in front of its star: a transit. Candidate signals require verification before they count as confirmed planets.
Reading the map
The luminous band is the Milky Way’s plane. Black patches inside the oval mark regions not yet imaged in this mosaic. The colored dots mark sky locations of planetary systems; they are not resolved photographs of the planets themselves.
| Map feature | Interpretation |
|---|---|
| Blue markers | Confirmed planets in the dated sample |
| Orange markers | Candidates awaiting verification |
| Dark gaps | Missing survey coverage in this mosaic |
Why it belongs in MKP
MKP perspective: The map is both an exploration milestone and a lesson in evidence. A promising detection and an established discovery belong in different categories. Preserving that distinction makes the scale of the achievement clearer.
The same discipline applies when imagining future exploration: a location on a map is a starting point for questions, not a guarantee of a habitable destination. Discovery, characterization and practical access are separate challenges.
Questions for readers and classrooms
Why should a map include its observation dates? How might missing coverage affect comparisons between sky regions? What extra evidence would you want before promoting an orange marker to blue?
Discuss the map →