The three NASA astronauts currently stationed on the International Space Station (ISS) live in relative comfort. The ISS is frequently supplied with cargo from Earth, the life support systems turn water into breathable oxygen and powerful filtration systems ensure not a single drop of liquid is wasted. Outside of the space station, however, the void of space is an incredibly inhospitable environment where danger can come from any direction.

One of the biggest threats faced by astronauts is the amount of radiation streaming from the Sun out into space.

At an orbital height of about 250 miles (402km), the ISS is mostly protected from this radiation by Earth’s magnetosphere.

Astronauts, however, lose this natural barrier when they venture beyond Earth’s boundaries to places like the Moon and Mars.

Space radiation takes the form of highly energetic particles ejected from the Sun at great speeds.


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These charged protons and electrons shoot out from the star and penetrate anything they encounter.

Even within the comfort of the ISS and Earth’s magnetosphere, astronauts still see bright flashes of light when they close their eyes – particles flying through their eyes.

With the exposure to radiation comes the increased risk of developing cancer and other dangerous maladies.

Energetic particles can tear through strands of DNA, triggering mutations and the growth of cancer cells.

According to Dr Andrzej Fludra from RAL Space at the Rutherford Appleton Laboratory (RAL), the particles are powerful enough to even punch through spacecraft walls.

He told “These energetic particles always pose a danger to astronauts in space.

“Even during the Apollo mission, there was a study that said if it was launched a few weeks this way or that way, they could have been hit by one of these energetic particle streams.

These energetic particles always pose a danger to astronauts in space

Dr Andrzej Fludra, RAL Space

“Fortunately they are quite sparsely distributed in time, so they can happen only once every few days, but when the Sun is very active during the maximum of the solar cycle, they would be launched much more frequently. Maybe even a few times a day.

“They are so energetic these protons, that they can penetrate the walls of the spacecraft.

“The only way for the astronauts to avoid the damage is to hide behind lead partitions.”

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With NASA’s Artemis programme returning to the Moon by 2024, the space agency will have to figure out a way of shielding astronauts from radiation.

One plan involves sending robots first to build habitats from the Moon’s soil – material that will keep astronauts safe from radiation and small space rock impacts.

A trip to Mars is of even greater concern because an average voyage from Earth to the Red Planet lasts between six to eight months.

During this time, astronauts would be exposed to incredible amounts of space radiation.

An extensive study on the effects of space radiation on mice found prolonged exposure threatens brain-related disorders such as memory loss and anxiety.

Another study at the Bulgarian Academy of Sciences found dealing with radiation has to be a “basic factor” when planing long-duration missions to space.

Dr Fludra is involved in the development of a solar probe that will study the physics behind the Sun’s inner and outer workings.

According to NASA, exposure to space radiation carries the risk of radiation sickness and “increased lifetime risk for cancer, central nervous system effects, and degenerative diseases”.

The space agency said: “Research studies of exposure in various doses and strengths of radiation provide strong evidence that cancer and degenerative diseases are to be expected from exposures to galactic cosmic rays or solar particle events.”

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