Artemis: The Moon Mission That’s Testing the Human Body

With Artemis II completing its 10-day journey and returning safely to Earth, NASA is already preparing for the next phase: Artemis III.

To most, Artemis is a mission to the Moon. But for biologists, it’s something far more exciting.

Beyond the rockets and spacecraft, Artemis is quietly studying how the human body responds to deep space: an environment with a stark contrast to earth.

We’ve made remarkable progress in space exploration. We’re preparing to return to the Moon and even use it as a stepping stone to reach Mars. But that raises an important question:

Is the human body ready for it?

Let’s dive into the biology behind Artemis and the AVATAR experiment that’s helping answer it.

AVATAR

One of the most fascinating experiments aboard Artemis II is AVATAR: A Virtual Astronaut Tissue Analog Response.

This study involves the use of advanced organ-on-chip technology to understand how human tissues respond to the extreme conditions of deep space, particularly microgravity and radiation. What makes this even more interesting is that these chips are developed using cells derived from the astronauts themselves, allowing researchers to study highly personalized biological responses.

At the center of this experiment is bone marrow tissue. Bone marrow plays a critical role in the body. It produces red blood cells, white blood cells, and platelets, making it a key indicator of overall health and immune function. By studying how marrow behaves in space, scientists can better understand how the human body copes with long-duration missions.

The insights from AVATAR could help:

• Identify potential health risks in deep space
• Develop personalized medical kits for astronauts
• Enable early preventive strategies during missions
  

But the impact doesn’t stop there.

Radiation risks

These findings could also advance research on ageing, immune function, and radiation exposure on Earth, with potential applications in areas like cancer treatment and regenerative medicine.

Beyond Earth’s protective magnetic field, astronauts are exposed to significantly higher levels of cosmic radiation one of the biggest challenges of deep space travel.

During Artemis II, advanced dosimeters are placed throughout the Orion capsule to continuously measure radiation exposure. These devices help scientists track how much radiation astronauts encounter during the mission.

Understanding these exposure levels is crucial. It allows researchers to:

• Assess potential health risks, including DNA damage
• Design better shielding for future spacecraft
• Develop strategies to protect astronauts on long-duration missions to the Moon and beyond
  

How does space affect your immune system?

Space doesn’t just challenge the body physically. It also disrupts the immune system in unexpected ways.

During Artemis II, scientists will analyze blood and saliva samples to understand how the space environment alters immune responses. Previous studies have shown that astronauts can become more susceptible to infections, including common colds and viral reactivations such as cold sores.

Researchers are also studying changes in:

• Stress hormones 
• Viral activity 
• Cellular immune responses 

These shifts suggest that microgravity and radiation can weaken the body’s ability to defend itself.

Understanding these effects not helps us keep astronauts safe and healthy during missions, but also to ensure they can perform at their best in extreme environments.

Precision health

As missions extend farther from Earth, astronaut health can no longer rely on one-size-fits-all solutions. Instead, NASA is focusing on precision health tailoring healthcare to each astronaut’s unique biology.

Through initiatives linked to Artemis II, scientists are exploring advanced approaches such as organ-on-chip models, studies on ageing and disease, and the use of synthetic biology to help the body adapt to space conditions.

This includes:

• Engineering essential molecules like vitamins and pharmaceuticals for long-duration missions
• Developing beneficial microbes to help prevent disease
• Expanding the use of biosensors to monitor conditions like low oxygen in real time

The goal is simple:

To keep astronauts healthy, resilient, and mission-ready no matter how far from Earth they travel.

Before we can live beyond Earth, we need to understand one thing-

Can the human body survive it?

Before we can live beyond Earth, we need to understand one thing: can the human body survive it?

But as we search for a home beyond our own, it also reminds us of a bigger responsibility:

to protect the only home we already have.