{
  "id": 3562405,
  "title": "Scientists Discover Vast Underground 'Anomaly' on Mars",
  "url": "https://urgent.news/2026/08/26/scientists-discover-vast-underground-anomaly-on-mars",
  "topic": "science",
  "section": "Science",
  "published": "2026-08-26T18:19:46.000Z",
  "source": {
    "name": "404 Media",
    "slug": "404-media",
    "url": "https://www.404media.co/scientists-discover-vast-underground-anomaly-on-mars/"
  },
  "original_language": "en",
  "account": "Scientists have unveiled a vast underground anomaly on Mars that may hold the key to the planet's divided geography and the mystery of whether it ever harbored alien life, according to a study published in Nature. Utilizing a novel technique called tidal tomography, researchers analyzed data from three Mars orbiters over 16 years to detect a temperature anomaly in the southern hemisphere's mantle, which lies between the planet's crust and core. This mantle region is between 400 to 750°F hotter in the southern hemisphere compared to the northern half. The temperature discrepancy could help explain the long-standing Martian dichotomy, a term describing the stark contrast between the northern lowlands potentially once home to a massive ocean and the southern highlands with higher average elevations. While the study doesn't provide a definitive answer, it adds crucial evidence to understanding Mars' internal structure. The origin of the dichotomy remains an ongoing question, with possibilities including ancient impacts or internal mantle processes, such as convection or plate tectonics. Tidal tomography, while previously applied to Earth and the Moon, is now being used to explore Mars, offering a non-invasive method to probe celestial bodies' interiors. Uncovering Mars' full complexity, from its atmosphere to its core, will provide insights into its past and present habitability and the potential for ancient life.",
  "summary": "Scientists have used a novel technique to detect a major temperature asymmetry under the surface of Mars that could shed light on the evolution and past habitability of the red planet.",
  "key_points": [
    "Scientists discover vast underground anomaly on Mars.",
    "Temperature anomaly in southern hemisphere's mantle.",
    "Tidal tomography technique reveals hidden structure."
  ],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}