Did Traveling to the Moon Take a Toll on Astronauts’ Hearts?

Astronauts who explore deep space may be more likely to suffer from cardiovascular disease later in their lives.

That’s the implication of a new study, which found that Apollo astronauts, who had flown to the moon in their 30s, were more likely to die of cardiovascular problems in their 50s and 60s than astronauts who flew missions in low Earth orbit.

In low Earth orbit—the domain of ISS and the former Space Shuttle flights—Earth’s magnetic field blocks radiation from further out in sp

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