The universe wasn’t always such a well-lit place. It had its own Dark Ages, back in the days before stars and galaxies formed. One of the big questions in astronomy concerns how stars and galaxies shaped the very early days of the Universe. The problem is, there’s no visible light travelling through the Universe from this time period.
Time capsules are a fun and time-honored way to preserve pieces of the past. In most cases, they include photographs, mementos and other items of personal value, things that give future generations a sense of what life was like in the past. But what if we intend to preserve the memories and experiences of an entire species for thousands of years? What would we choose to squirrel away then, and where would be place it?
That’s precisely what researchers from the Molecular Information Systems Lab at the University of Washington (UW) and Microsoft had in mind when they announced their #MemoriesInDNA project. This project invites people to submit photos that will be encoded in DNA and stored for millennia. And thanks to a new partnership with the Arch Mission Foundation, this capsule will be sent to the Moon in 2020!
In the coming decades, NASA has ambitious plans to send astronauts back to the Moon and conduct the first crewed mission to Mars. In order to accomplish these lofty goals, the agency is investing in cutting-edge technology and partnering with major aerospace companies to create the necessary spacecraft and mission components.
One such component, which will allow astronauts to travel to and from the lunar surface, is Lockheed Martin’s concept for a reusable lunar lander. The concept was presented today at the 69th annual International Astronautical Congress (IAC) in Bremen, Germany, where space agency and industry experts were treated to the latest in space exploration advancements.
In the coming decades, NASA intends to mount some bold missions to space. In addition to some key operations to Low Earth Orbit (LEO), NASA intends to conduct the first crewed missions beyond Earth in over 40 years. These include sending astronauts back to the Moon and eventually mounting a crewed mission to Mars.
To this end, NASA recently submitted a plan to Congress that calls for human and robotic exploration missions to expand the frontiers of humanity’s knowledge of Earth, the Moon, Mars, and the Solar System. Known as the National Space Exploration Campaign, this roadmap outlines a sustainable plan for the future of space exploration.
In 2003, the European Space Agency (ESA) launched the Small Missions for Advanced Research in Technology-1 (SMART-1) lunar orbiter. After taking 13 months to reach the Moon using a Solar Electric Propulsion (SEP) system, the orbiter then spent the next three years studying the lunar surface. Then, on September 3rd, 2006, the mission came to an end as the spacecraft was deliberately crashed onto the lunar surface.
While the bright flash that this created was captured by observers using the Canada-France-Hawaii Telescope in Hawaii, no other spacecraft were in orbit at the time to witness it. As a result, it has been impossible for over a decade to determine precisely where SMART-1 went down. But thanks to images captured last year by NASA’s Lunar Reconnaissance Orbiter (LRO), the final resting place of SMART-1 is now known.
When it comes right down to it, the Moon is a pretty hostile environment. It’s extremely cold, covered in electrostatically-charged dust that clings to everything (and could cause respiratory problems if inhaled), and its surface is constantly bombarded by radiation and the occasional meteor. And yet, the Moon also has a lot going for it as far as establishing a human presence there is concerned.
In the coming decades, many space agencies hope to conduct crewed missions to the Moon and even establish outposts there. In fact, between NASA, the European Space Agency (ESA), Roscosmos, and the Indian and Chinese space agencies, there are no shortages of plans to construct lunar bases and settlements. These will not only establish a human presence on the Moon, but facilitate missions to Mars and deeper into space.
To put it simply, the entire surface of the Moon is covered in dust (aka. regolith) that is composed of fine particles of rough silicate. This dust was formed over the course of billions of years by constant meteorite impacts which pounded the silicate mantle into fine particles. It has remained in a rough and fine state due to the fact that the lunar surface experiences no weathering or erosion (due to the lack of an atmosphere and liquid water).
Because it is so plentiful, reaching depths of 4-5 meters (13-16.5 feet) in some places – and up to 15 meters (49 feet) in the older highland areas – regolith is considered by many space agencies to be the building material of choice for lunar settlements. As Aidan Cowley, the ESA’s science advisor and an expert when it comes to lunar soil, explained in a recent ESA press release:
“Moon bricks will be made of dust. You can create solid blocks out of it to build roads and launch pads, or habitats that protect your astronauts from the harsh lunar environment.”
In addition to taking advantage of a seemingly inexhaustible local resource, the ESA’s plans to use lunar regolith to create this base and related infrastructure demonstrates their commitment to in-situ resource utilization. Basically, bases on the Moon, Mars, and other locations in the Solar System will need to be as self-sufficient as possible to reduce reliance on Earth for regular shipments of supplies – which would both expensive and resource-exhaustive.
To test how lunar regolith would fare as a building material, ESA scientists have been using Moon dust simulants harvested right here on Earth. As Aiden explained, regolith on both Earth and the Moon are the product of volcanism and are basically basaltic material made up of silicates. “The Moon and Earth share a common geological history,” he said, “and it is not difficult to find material similar to that found on the Moon in the remnants of lava flows.”
The simulant were harvested from the region around Cologne, Germany, that were volcanically active about 45 million years ago. Using volcanic powder from these ancient lava flows, which was determined to be a good match for lunar dust, researchers from the European Astronaut Center (EAC) began using the powder (which they’ve named EAC-1) to fashioning prototypes of the bricks that would be used to created the lunar village.
Spaceship EAC, an ESA initiative designed to tackle the challenges of crewed spaceflight, is also working with EAC-1 to develop the technologies and concepts that will be needed to create a lunar outpost and for future missions to the Moon. One of their projects centers on how to use the oxygen in lunar dust (which accounts for 40% of it) to help astronauts have extended stays on the Moon.
But before the ESA can sign off on lunar dust as a building material, a number of tests still need to be conducted. These include recreating the behavior of lunar dust in a radiation environment to simulate their electrostatic behavior. For decades, scientists have known that lunar dust is electrically-charged because of the way it is constantly bombarded by solar and cosmic radiation.
This is what causes it to lift off the surface and cling to anything it touches (which the Apollo 11 astronauts noticed upon returning to the Lunar Module). As Erin Transfield – a member of ESA’s lunar dust topical team – indicated, scientists still do not fully understand lunar dust’s electrostatic nature, which could pose a problem when it comes to using it as a building material.
What’s more, the radiation-environment experiments have not produced any conclusive results yet. As a biologist who dreams of being the first woman on the Moon, Transfield indicated that more research is necessary using actual lunar dust. “This gives us one more reason to go back to the Moon,” she said. “We need pristine samples from the surface exposed to the radiation environment.”
Beyond establishing a human presence on the Moon and allowing for deep-space missions, the construction of the ESA’s proposed lunar village would also offer opportunities to leverage new technologies and forge partnerships between the public and private sector. For instance, the ESA has collaborated with the architectural design firm Foster + Partners to come up with the design for their lunar village, and other private companies have been recruited to help investigate other aspects of building it.
This mission, a joint effort between the ESA and Roscosmos, will involve a Russian-built lander setting down in the Moon’s South Pole-Aitken Basin, where the PROSPECT probe will deploy and drill into the surface to retrieve samples of ice. Going forward, the ESA’s long-term plans also call for a series of missions to the Moon beginning in the 2020s that would involve robot workers paving the way for human explorers to land later.
In the coming decades, the intentions of the world’s leading space agencies are clear – not only are we going back to the Moon, but we intend to stay there! To that end, considerable resources are being dedicated towards researching and developing the necessary technologies and concepts needed to make this happen. By the 2030s, we might just see astronauts (and even private citizens) coming and going from the Moon with regular frequency.
And be sure to check out this video about the EAC’s efforts to study lunar regolith, courtesy of the ESA:
To put it simply, the Earth’s Moon is a dry, airless place where nothing lives. Aside from concentrations of ice that exist in permanently-shaded craters in the polar regions, the only water on the moon is believed to exist beneath the surface. What little atmosphere there is consists of elements released from the interior (some of which are radioactive) and helium-4 and neon, which are contributed by solar wind.
However, astronomers have theorized that there may have been a time when the Moon might have been inhabitable. According to a new study by an astrophysicist and an Earth and planetary scientist, the Moon may have had two early “windows” for habitability in the past. These took place roughly 4 billion years ago (after the Moon formed) and during the peak in lunar volcanic activity (ca. 3.5 billion years ago).
For the sake of their study, Schulze-Makuch and Crawford drew on the results of several recent space missions and analyses of lunar rock and soil samples – which indicated that the Moon is not as dry as previously thought. They also drew on recent studies of the products of lunar volcanism, which indicate that the lunar interior contains more water than previously thought and that the lunar mantle may even be as comparably water-rich as Earth’s upper mantle.
From this, they concluded that conditions on the lunar surface were sufficient to support simple lifeforms during two periods in the past. The first was roughly 4 billion years ago, when the Moon began to form from a debris disk caused by an impact between a Mars-sized object (named Theia) and Earth – aka. the Giant Impact Hypothesis. The second occurred 3.5 billion years ago when the Moon was at the peak of its volcanic activity.
At both times, planetary scientists think the Moon was releasing considerable amounts of superheated volatile gasses from its interior, which would include water vapor. This outgassing could have formed pools of liquid water on the lunar surface and an atmosphere dense enough to keep it there for millions of years. The early Moon is also believed to have had its own magnetic field, which would have protected lifeforms on the surface from deadly solar radiation.
“If liquid water and a significant atmosphere were present on the early Moon for long periods of time, we think the lunar surface would have been at least transiently habitable.”
Schulze-Makuch and Crawford’s work draws on data from recent space missions and analyses of lunar rock and soil samples that show the Moon is more watery than scientists gave it credit for. These include India’s first lunar mission, Chandrayaan I, which created a high-resolution chemical and mineralogical map of the lunar surface in 2009, which confirmed the presence of water molecules in the soil.
Additionally, ongoing examinations of the lunar rocks returned by the Apollo astronauts and studies of lunar volcanic deposits have provided strong evidence that there is a large amount of water in the lunar mantle that is thought to have been deposited very early on in the Moon’s formation. As for how the life got there, that remains a bit of an open question.
Schulze-Makuch and Crawford believe that it may have originated much as it did on Earth, but that the more likely scenario is that it was brought from Earth by meteorites. Essentially, the earliest evidence for life on Earth indicates that cyanobacteria existed on our planet 3.5 to 3.8 billion years ago. This coincides with the Late Heavy Bombardment, when the Solar System was experiencing frequent and giant meteorite impacts.
So basically, it is possible that large impacts could have blasted off pieces of the Earth’s surface, which contained simple organisms like cyanobacteria. These chunks could have then reached the Moon and landed on its surface, seeding it with basic lifeforms that would have been capable of surviving in the lunar environment. As Schulze-Makuch said:
“It looks very much like the Moon was habitable at this time. There could have actually been microbes thriving in water pools on the Moon until the surface became dry and dead.”
Looking ahead, there are several missions that are scheduled to explore the lunar surface. These include India’s Chandrayaan-2, a rover and sample analysis mission, and China’s Chang’e 4 and Chang’e 5 rovers – which will explore the southern polar region and conduct a sample return mission, receptively. NASA and Roscosmos also plan to send multiple missions to the Moon in the coming years to map it’s mineralogy, water deposits, and radiation environment.
Some of these missions may be able to obtain samples from volcanic deposits that correspond to the period of heightened volcanic activity that took place 3.5 billion years ago for signs of water and biomarkers. In the meantime, experiments could be conducted on Earth or aboard the ISS to simulate lunar environments to see if microorganisms could survive under the conditions that are predicted to have existed at these times.
If successful, these sample return missions and experiments could indicate that the Moon itself was once a habitable environment. And, with the right kind of geoengineering (aka. terraforming), maybe it could be habitable again someday!