What will the MMX spacecraft do?

After arriving at Mars in August 2027, the spacecraft will begin its survey of Phobos and Deimos. It will then study Phobos in detail before collecting a sample from the moon's surface no earlier than December 2028.

The mission's final step is a homecoming: the spacecraft will deliver the Phobos material to Earth in 2031, giving scientists their first hands-on look at a piece of a Martian moon.

Phobos and Deimos are small, irregularly shaped bodies, and researchers have long debated whether they are captured asteroids or fragments blasted off Mars by ancient impacts. A physical sample could help settle that question, though the mission's timeline — spanning roughly a decade from launch to sample return — leaves room for schedule adjustments along the way.

What is NASA contributing?

NASA's role in the mission covers instruments, hardware, infrastructure and people:

• MEGANE, a gamma-ray and neutron spectrometer that will measure the chemical composition of the Martian moons. The name comes from the Japanese word for "glasses," fitting for an instrument designed to sharpen scientists' view of Phobos. Johns Hopkins Applied Physics Laboratory developed it.
• The pneumatic sampler mechanism, built by Honeybee Robotics, a Blue Origin company, which will gather material from Phobos's surface using bursts of gas.
• Communications and navigation support from NASA's Deep Space Network, the system of large radio antennas the agency uses to talk with distant spacecraft.
• Funding for U.S. scientists serving on the MMX science team.

A spectrometer, in plain terms, is an instrument that identifies what a surface is made of by analyzing the energy of particles and light it gives off. MEGANE specifically detects gamma rays and neutrons, which escape from the top layer of a planetary surface and carry a chemical fingerprint of the material below.

How is the work funded?

NASA's Discovery Program paid for the agency's contributions to MMX. The Discovery Program funds frequent, relatively low-cost flight opportunities for focused, high-value planetary science investigations, and NASA's Marshall Space Flight Center in Huntsville, Alabama, manages it on behalf of the agency's Science Mission Directorate in Washington.

For readers who want to follow the mission in real time, NASA maintains a dedicated MMX page at science.nasa.gov/mission/mmx.

The October 15 briefing offers a preview rather than final results — the spacecraft has not yet left the ground, and its observations of Phobos remain years away. Still, with launch just days after the teleconference, the mission marks a concrete step toward answering one of planetary science's oldest questions: where did Mars's moons come from?