NASA’s TESS Unveils Its Most Complete All-Sky Mosaic of Exoplanets

NASA’s Transiting Exoplanet Survey Satellite (TESS) released an all-sky mosaic built from data collected between April 2018 and September 2025. The image, assembled from 96 TESS sectors, marks 679 confirmed exoplanets with blue dots and 5,165 orange dots representing candidate planets yet to be validated. The mosaic also captures a bright arc of the Milky Way and two white ovals identifying the Large and Small Magellanic Clouds.

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TESS first imaged the sky in May 2018, showing over 200,000 stars. Over the next eight years it observed each sky strip for roughly 27 days using four identical cameras, each equipped with 4,096 × 4,096-pixel back-illuminated sensors and f/1.4 lenses. The second extended mission concluded in September 2025, expanding coverage to nearly the entire celestial sphere.

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The mosaic was assembled by NASA, MIT/Lincoln Lab, and University of Maryland researchers. Project scientists include Rebekah Hounsell (TESS project scientist, UMBC & NASA Goddard) and Allison Youngblood (TESS project scientist, NASA Goddard). Image processing credit goes to Veselin Kostov (University of Maryland, College Park).

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The mosaic identifies 679 confirmed exoplanets spanning sizes from Mercury-like bodies to planets larger than Jupiter, including several in their stars’ habitable zones. Candidate detections number 5,165, representing the largest catalog of potential worlds compiled by a single mission.

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The expanded planet inventory improves statistical studies of planetary system architectures and informs the search for life by highlighting worlds in habitable zones. TESS data also support investigations of young stellar populations, galactic dynamics, and near-Earth asteroid monitoring, demonstrating the mission’s multi-disciplinary value.

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Project scientists emphasized that TESS has become a high-throughput engine for exoplanet discovery, delivering planets across a broad size range and locating those within habitable zones. They also noted that deeper analysis using automated algorithms continues to reveal unexpected phenomena, extending the mission’s relevance beyond planet detection to stellar and asteroid science.

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The article lists candidate exoplanets as “nearly 5,200” and later specifies 5,165, indicating a minor inconsistency. No breakdown of validation status for candidates is provided.

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• “Over the last eight years, TESS has become a fire hose of exoplanet science,” — Rebekah Hounsell, TESS project scientist, UMBC & NASA Goddard

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• “This menagerie includes worlds that may be covered by volcanoes, are being destroyed by their stars, or orbit two stars — experiencing double sunrises and sunsets each day,” — NASA

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• “The more we dig into the large TESS dataset, especially using automated algorithms, the more surprises we find,” — Allison Youngblood, TESS project scientist, NASA Goddard

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• “highly optimized, red-sensitive, wide-field cameras that together can monitor a 24 degree by 90 degree strip of the sky.” — MIT

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The TESS team indicates that ongoing analysis of the extensive dataset will likely uncover additional planets and unexpected astrophysical phenomena, as the mission continues to fill in more of the night sky.

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