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Japan to launch spacecraft to collect samples from Mars moon Phobos

Associated Press reports Japan's Tuesday H-3 launch begins a mission to bring Phobos samples back toward Earth.

Updated Oct 20, 2026 · 10:26 UTC10 reports

The short version

  • Japan plans to launch a spacecraft on an H-3 rocket on Tuesday, Associated Press reports.[Associated Press]
  • The mission would be the world's first attempt to bring back samples from Phobos, one of Mars's two moons.[Associated Press]
  • Scientists expect the roughly five-year mission to help explain how Phobos and Deimos formed, though that benefit is hoped for rather than established.[Associated Press]
  • Sampling has not happened yet, and JAXA officials estimate Martian material will be only about 0.1 percent of what is collected.[Associated Press]

Key facts

  • Japan plans to launch a spacecraft on Tuesday on an H-3 rocket to bring back samples from Phobos.[Associated Press]
  • The mission is described as the world's first attempt to bring back samples from Phobos.[Associated Press]
  • Scientists expect the mission to take about five years and hope it will clarify how Phobos and Deimos formed.[Associated Press]
  • Japan leads the international mission, which includes equipment and communications support from NASA and other national space agencies.[Associated Press]
  • JAXA officials estimate that material from Mars will make up about 0.1 percent of the material collected from Phobos.[Associated Press]
  • JAXA scientists aim to collect at least 10 grams of Phobos soil through two sampling attempts using U.S. and Japanese methods.[Associated Press]
  • The French-German rover Idefix is set to land on Phobos first and explore the surface during a 100-day mission around 2029.[Associated Press]
  • Only the spacecraft's third module will return to Earth, carrying the samples stored in a capsule.[Associated Press]

What remains uncertain

  • The mission has not yet launched, and its sampling and science goals remain unproven; scientific benefits are described as hopes.[Associated Press]
  • The share of Martian material in the collected samples is an official estimate, not a measured result.[Associated Press]

Sources

Outlet counts describe coverage, not independent confirmation. Reports may share a wire service or original source.