Columnist Leonard David

Moon FARSIDE: Lunar Astronomy Proposal Takes Aim at Cosmic Dark Ages and Exoplanets

An artist's depiction of the FARSIDE array.
An artist's depiction of the FARSIDE array. (Image credit: NASA/JPL-Caltech/Jack Burns, Univ. of Colorado, Boulder)

The far side of the moon is an attention grabber for many reasons. A new mission idea capitalizes on those reasons in a project dubbed the Farside Array for Radio Science Investigations of the Dark ages and Exoplanets, shortened to this enlightened abbreviation: FARSIDE.

The concept would place a low-radio-frequency interferometric array on the far side of the moon. Jack Burns of the University of Colorado Boulder and Gregg Hallinan of the California Institute of Technology have sketched out a way to execute the mission in a NASA-funded report published last month.

Related: The Moon: 10 Surprising Lunar Facts

An artist's depiction of Blue Origin's Blue Moon lander. (Image credit: Blue Origin)

According to those materials, FARSIDE would enable near-continuous monitoring of the nearest stellar systems, letting scientists search for coronal mass ejections and energetic particle events at other stars. The instrument would also be able to detect magnetospheres of the nearest exoplanets that could be habitable. FARSIDE would be able to characterize similar activity in our own solar system as well, from the sun to the outer planets, including the hypothetical Planet Nine.

Related: Photo Shows Far Side of Moon Like Never Before

But those are just the highlights. The team explained that FARSIDE could also conduct a range of other tasks. Those applications might include sounding the lunar subsurface and characterizing the interstellar medium in the solar system neighborhood.

The FARSIDE idea encompasses the instrument itself, a deployment rover, the lander and a base station. FARSIDE relies on 128 dipole antennas deployed across 6 miles (10 kilometers) of the lunar landscape by a rover. Tethers connect the antennas to a base station for central processing, power and data transmission to the proposed NASA Lunar Gateway or an alternative relay satellite.

An artist's depiction of the deployment scheme of the FARSIDE array. (Image credit: NASA/JPL-Caltech/Jack Burns, Univ. of Colorado, Boulder)

FARSIDE would require transportation to the lunar surface, likely on board a commercial lunar lander. The study report uses the Blue Origin Blue Moon lander as a reference for the design.

All told, the team estimated that the budget for FARSIDE, after applying NASA and JPL standard cost reserves of 30% during development and 15% during operations, would be roughly $1.3 billion.

FARSIDE uses the Lunar Gateway, or similar Lunar asset, for communication with Earth. (Image credit: NASA/JPL-Caltech/Jack Burns, Univ. of Colorado, Boulder)

"In the past decade, significant investments have been made by commercial companies to develop the capability to deliver payloads to the surface of the moon, with some companies now on the horizon of success" the team wrote in the report. "NASA shows strong support of these companies through the Commercial Lunar Payload Services Program (CLPS), which recently awarded the first contract to three companies for payload delivery with a launch target in 2021."

An artist's impression of a habitable planet experiencing a coronal mass ejection (CME) from its host star, an active M dwarf. Detecting coronal mass ejections, energetic particle events and the magnetospheres of candidate habitable planets is a key science goal for the FARSIDE array. (Image credit: Chuck Carter/Caltech/Kiss)

"The study report notes that, because "sky noise" is so limited on the lunar farside, it's the only location within the inner solar system from which observations can be carried out, using frequencies that would best fulfill the promise of FARSIDE."

This study may be of interest to the lunar science community, Burns said, since it describes "how the array of low frequency radio dipole antennas might also be used to probe the subsurface on the lunar farside and as stations for seismic activity."

Leonard David is author of the recently released book, "Moon Rush: The New Space Race" published by National Geographic in May 2019. A longtime writer for, David has been reporting on the space industry for more than five decades. Follow us on Twitter @Spacedotcom or Facebook

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Leonard David
Space Insider Columnist

Leonard David is an award-winning space journalist who has been reporting on space activities for more than 50 years. Currently writing as's Space Insider Columnist among his other projects, Leonard has authored numerous books on space exploration, Mars missions and more, with his latest being "Moon Rush: The New Space Race" published in 2019 by National Geographic. He also wrote "Mars: Our Future on the Red Planet" released in 2016 by National Geographic. Leonard  has served as a correspondent for SpaceNews, Scientific American and Aerospace America for the AIAA. He was received many awards, including the first Ordway Award for Sustained Excellence in Spaceflight History in 2015 at the AAS Wernher von Braun Memorial Symposium. You can find out Leonard's latest project at his website and on Twitter.

  • Dwight Huth
    The far side of the Moon would be the best place to set up a permanent telescope, maybe 10 feet in diameter. The far side of the Moon is protected from the Sun's light, thus creating a nearly 100% light and heat wave shroud for the telescope.
  • Paco
    Dwight Huth said:
    The far side of the Moon would be the best place to set up a permanent telescope, maybe 10 feet in diameter. The far side of the Moon is protected from the Sun's light, thus creating a nearly 100% light and heat wave shroud for the telescope.
    The far side of the Moon is not protected from the Sun light, it has a two weeks of day an two weeks night. It is protected against the radio noise from Earth.
  • ChrisA
    The far side of the Moon gets exactly as much sunlight are the near side that faces Earth. The advantage of the Farside is that is faces away from Earth. There are many radio transmitters on Earth and the bulk of the Moon makes a good shield.

    As for the idea of a large optical telescope on the Moon. Why? These can be flown in space. But a 10 Km diameter radio telescope is too large to put on a spacecraft