Study Findings: Radar Evidence of an Accessible Cave Conduit on the Moon Below the Mare Tranquillitatis Pit

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Image (Credit): Mare Tranquillitatis Pit on the lunar surface. (http://www.lroc.asu.edu/atlases/pits/3)

Nature Astronomy abstract of the study findings:

Several potential subsurface openings have been observed on the surface of the Moon. These lunar pits are interesting in terms of science and for potential future habitation. However, it remains uncertain whether such pits provide access to cave conduits with extensive underground volumes. Here we analyse radar images of the Mare Tranquillitatis pit (MTP), an elliptical skylight with vertical or overhanging walls and a sloping pit floor that seems to extend further underground. The images were obtained by the Mini-RF instrument onboard the Lunar Reconnaissance Orbiter in 2010. We find that a portion of the radar reflections originating from the MTP can be attributed to a subsurface cave conduit tens of metres long, suggesting that the MTP leads to an accessible cave conduit beneath the Moon’s surface. This discovery suggests that the MTP is a promising site for a lunar base, as it offers shelter from the harsh surface environment and could support long-term human exploration of the Moon.

Citation: Carrer, L., Pozzobon, R., Sauro, F. et al. Radar evidence of an accessible cave conduit on the Moon below the Mare Tranquillitatis pit. Nat Astron (2024).
https://doi.org/10.1038/s41550-024-02302-y

Study-related stories:

Pic of the Week: Stellar Penguin and Egg

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Image (Credit): The Penguin and Egg galaxies, known jointly as Arp 142. (NASA, ESA, CSA, STScI)

This week’s fun image comes from the James Webb Space Telescope. Called the Penguin and the Egg, these two galaxies of similar mass are locked together.

Here is the story of the two galaxies from NASA:

Before their first approach, the Penguin held the shape of a spiral. Today, its galactic center gleams like an eye, its unwound arms now shaping a beak, head, backbone, and fanned-out tail.

Like all spiral galaxies, the Penguin is still very rich in gas and dust. The galaxies’ “dance” gravitationally pulled on the Penguin’s thinner areas of gas and dust, causing them to crash in waves and form stars. Look for those areas in two places: what looks like a fish in its “beak” and the “feathers” in its “tail.”

Surrounding these newer stars is smoke-like material that includes carbon-containing molecules, known as polycyclic aromatic hydrocarbons, which Webb is exceptional at detecting. Dust, seen as fainter, deeper orange arcs also swoops from its beak to tail feathers.

In contrast, the Egg’s compact shape remains largely unchanged. As an elliptical galaxy, it is filled with aging stars, and has a lot less gas and dust that can be pulled away to form new stars. If both were spiral galaxies, each would end the first “twist” with new star formation and twirling curls, known as tidal tails.

Another reason for the Egg’s undisturbed appearance: These galaxies have approximately the same mass or heft, which is why the smaller-looking elliptical wasn’t consumed or distorted by the Penguin.

It is estimated that the Penguin and the Egg are about 100,000 light-years apart — quite close in astronomical terms. For context, the Milky Way galaxy and our nearest neighbor, the Andromeda Galaxy, are about 2.5 million light-years apart. They too will interact, but not for about 4 billion years.

NASA Cancels VIPER Moon Mission

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Image (Credit): An artist’s rendering of the NASA’s PRIME-1 spacecraft approaching the Moon. The mission will need to accomplish some of the work previously assigned to the VIPER mission. (NASA)

It has not been a great year for NASA so far. While the Chinese brought back samples from the far side of the Moon, we saw two NASA-contracted commercial spacecraft either fail to reach the Moon or critically mess up the landing. Plus we now have a Boeing capsule stranded at the International Space Station (ISS) while SpaceX just flubbed a rocket launch that brings into question manned flights to the ISS.

Am I missing anything? Oh yeah, and NASA has decided to cancel its Moon rover, the Volatiles Investigating Polar Exploration Rover (VIPER) project, after spending $450 million. Cost overruns and multiple delays had made the mission too expensive and too late in the game to be useful.

Nicola Fox, associate administrator, Science Mission Directorate, NASA Headquarters in Washington, stated:

We are committed to studying and exploring the Moon for the benefit of humanity through the [Commercial Lunar Payload Services] program…The agency has an array of missions planned to look for ice and other resources on the Moon over the next five years. Our path forward will make maximum use of the technology and work that went into VIPER, while preserving critical funds to support our robust lunar portfolio.

Fortunately, VIPER was one of a number of missions designed to seek water on the lunar surface. For example, NASA has the Polar Resources Ice Mining Experiment-1 (PRIME-1) , which is still scheduled to land at the South Pole later this year.

It has been a rough year for NASA, but the multiple missions planned for the Moon provide more opportunities to get it right, while the ISS issues do not appear insurmountable. NASA just needs a break, and its commercial partners need to prove they can meet the goals that were set for them.

Note: If you were one of the people who added your name to the VIPER mission, maybe NASA will open up another opportunity for your name on the Moon.

A Day in Astronomy: Launch of the Manned Saturn V Rocket to the Moon

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Image (Credit): The launch of the Apollo 11 space vehicle from the launch pad on July 16, 1969. (NASA/ Kipp Teague)

On this day in 1969, NASA launched the Saturn V rocket that carried astronauts Armstrong, Edwin “Buzz” Aldrin, and Michael Collins on the first manned lunar landing. The 363-feet tall Saturn V rocket was launched from Pad A, Launch Complex 39, Kennedy Space Center, at 9:32 a.m. EDT. 

While this was the most significant use of the Saturn V at that point in time, it was the backbone of the Apollo program. The first crewed Saturn V to launch was Apollo 8, which orbited the Moon without landing.

You can listen in on the control room chatter surrounding the launch at this NASA launch history site.

NASA has a number of events planned for this month to celebrate the 55th anniversary of the Moon landing. You can read about the planned activities at this NASA anniversary site.

Space Stories: Redefining Planets, Second Thoughts About Crashing the ISS, and NASA Preparing for Artemis II

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Credit: AdisResic at Pixabay

Here are some recent stories of interest.

—Space.com: “‘What Exactly is a Planet?’ Astronomers Want to Amend the Definition“

Three astronomers last week proposed expanding the official definition of a planet to encompass worlds orbiting stars other than our own, a nuance not currently included in the formal definition of the term established in 2006 by the International Astronomical Union, or IAU. If the trio’s new definition pans out, thousands of celestial bodies across the universe could be confirmed as formal planets.

—Forbes: “U.S. Plan To Crash Space Station Is Condemned By Space Agency Leaders“

An American plan to destroy the International Space Station by propelling it to burn through the atmosphere, and then crashing it into the Pacific Ocean, would rob citizens of the future of one of civilization’s greatest technological masterworks, and should be halted, say one-time leaders of NASA and of the European Space Agency. NASA’s draft blueprints to send the ISS on a peacetime kamikaze mission, to explode on impact with Antarctic waters, would obliterate a pole star of human ingenuity, says Jean-Jacques Dordain, Director General of the European Space Agency when the ISS was being built and expanded.

—NASA: “‘NASA Barge Preparations Underway for Artemis II Rocket Stage Delivery“

Team members are installing pedestals aboard NASA’s Pegasus barge to hold and secure the massive core stage of NASA’s SLS (Space Launch System) rocket, indicating NASA barge crews are nearly ready for its first delivery to support the Artemis II test flight around the Moon. The barge will ferry the core stage on a 900-mile journey from the agency’s Michoud Assembly Facility in New Orleans to its Kennedy Space Center in Florida…Measuring 212 feet in length and 27.6 feet in diameter, the core stage is the largest rocket stage NASA has ever built and the longest item ever shipped by a NASA barge.