Photosynthesis, an ancient process dating back 2.3 billion years, has played a vital role in supporting life on Earth. This remarkable yet still partially understood reaction enables organisms to convert sunlight, water, and carbon dioxide into oxygen and energy in the form of sugar. While photosynthesis is often taken for granted on our planet, its rarity and value become evident as we venture beyond Earth. Recent advancements in artificial photosynthesis offer promising possibilities for space exploration and colonization, as explored in a new study published in Nature Communications.

The challenge of space travel lies in the human need for oxygen. Limited fuel capacity restricts the amount of oxygen that can be carried, particularly for long-duration journeys to destinations like the moon and Mars. Trips to Mars typically span around two years, making it impractical to transport sufficient resources from Earth. Oxygen production through carbon dioxide recycling is already accomplished on the International Space Station (ISS) using a process called electrolysis, which employs electricity from solar panels to split water into hydrogen and oxygen gases. Additionally, a separate system converts exhaled carbon dioxide into water and methane.

The California Institute of Technology (Caltech) has made a remarkable breakthrough in the field of space-based power by successfully beaming solar power from space to Earth without the need for any physical wires—a significant milestone, according to reports.

This groundbreaking experiment is part of Caltech’s Space Solar Power Project, and the institute recently announced the successful transmission through a press release. Researchers accomplished the power transfer using the Microwave Array for Power-transfer Low-orbit Experiment (MAPLE), a small prototype deployed aboard the in-orbit Space Solar Power Demonstrator (SSPD-1) launched in January. The team achieved a significant feat by transmitting solar power collected in space using microwaves to a receiver on the rooftop of Gordon and Betty Moore Laboratory of Engineering on Caltech’s campus in Pasadena.

Co-director of the Space Solar Power Project, Ali Hajimiri, expressed excitement about the results, stating, “Through the experiments we have run so far, we received confirmation that MAPLE can transmit power successfully to receivers in space. We have also been able to program the array to direct its energy toward Earth, which we detected here at Caltech. We had, of course, tested it on Earth, but now we know that it can survive the trip to space and operate there.”

On June 25, 2023, a team of four crew members will embark on a groundbreaking Mars mission, but with a unique twist—they won’t actually leave Earth. Instead, they will spend an entire year living in a small 3D-printed habitat within a hangar at NASA’s Johnson Space Center in Houston. This simulated Martian environment, known as Chapea (Crew Health and Performance Exploration Analog), aims to examine the psychological and social challenges that future astronauts may face when venturing to the Red Planet.

The isolated and harsh conditions of Mars pose formidable obstacles for early visitors, making it crucial to understand how to ensure the well-being and productivity of the crew. Lessons learned from this social experiment could help NASA devise strategies to enhance crew comfort, foster positive interpersonal dynamics, and address issues such as loneliness and homesickness. The mission’s biomedical researcher and commander, Kelly Haston, acknowledges the difficulty of the undertaking, emphasizing the importance of completing the year without any attrition. Unlike this simulated mission, actual Mars missions will offer no exit option.