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William Shatner oldest astronaut at 90 – Here's how space tourism could affect older people

William Shatner floats in front if his window, with the Earth visible in the background, during Blue Origin's New Shepard launch on Oct. 13, 2021 in this video still.
William Shatner floats in front if his window, with the Earth visible in the background, during Blue Origin's New Shepard launch on Oct. 13, 2021 in this video still. (Image credit: Blue Origin)

This article was originally published at The Conversation. (opens in new tab) The publication contributed the article to Space.com's Expert Voices: Op-Ed & Insights.

Nick Caplan (opens in new tab), Professor of Aerospace Medicine and Rehabilitation, Northumbria University, Newcastle

Christopher Newman (opens in new tab), Professor of Space Law and Policy, Northumbria University, Newcastle

Is space really the final frontier? William Shatner has found out after boldly going where no 90-year-old has gone before. Some 55 years after Captain James T Kirk hit our screens in the original "Star Trek," Shatner recently launched to the edge of space aboard Blue Origin's New Shepard for a 10-minute suborbital flight.

Shatner has become the oldest person to go to space, breaking the record set only recently by 82-year-old Wally Funk, who traveled on the New Shepard's first crewed spaceflight in July. Funk was one of the Mercury 13 women who qualified for spaceflight in the 1960s but never flew.

With commercial spaceflight companies now taking older people to space, it's timely to consider the potential physical impact space flight might have on them.

Video: Watch William Shatner gaze at Earth from space in awe
In photos: William Shatner's space launch with Blue Origin

In just a few days in space, the human body starts to adapt (opens in new tab). Astronauts' bones start to lose density and their muscles become smaller and weaker because they're not being used to stand up against gravity or to move around.

While these changes aren't much of a problem in microgravity, they can lead to increased risk of injury (opens in new tab), such as back pain or bone fracture, when returning to Earth. Astronauts spend considerable time exercising in space (opens in new tab) to minimize these adaptations, which are similar to age-related changes (opens in new tab) affecting people on Earth, but happen much more quickly (opens in new tab).

A 90-year-old person with normal age-related health changes might arrive in space with their muscles and bones already deconditioned. This could present additional risks as their body adapts further when deprived of gravity. While we can speculate, not nearly enough older people have gone to space for us to know for sure how their bodies will cope.

Anyone like Shatner who only spends a few minutes in microgravity won't need to worry about this too much. The greatest risks to their health are the mental and physical stresses experienced during launch, re-entry into Earth's atmosphere, and landing.

"Star Trek" actor William Shatner (second from right) poses for a photo with his Blue Origin NS-18 crewmates during his record-setting launch into suborbital space at age 90 on Oct. 13, 2021. (Image credit: Blue Origin)

During launch, Shatner and his three co-passengers would have experienced vibrations resulting from the thrust generated by New Shepard's BE-3 engine (opens in new tab), which is equivalent to more than 1 million horsepower, or more than 2,000 times as powerful as the 480 horsepower of a Tesla Model 3 (opens in new tab).

This would lead them to experience an acceleration or g-force of 3g (opens in new tab). It's a tricky concept to explain, but essentially, this feels like three people the same size as you sitting on your chest, pushing you into your seat. During re-entry into the atmosphere, the g-force reaches 6g (opens in new tab).

High g-forces can have profound effects on the human body. At high g-forces, blood can be pulled away from the head which can starve the brain of oxygen. This can lead to visual changes including tunnel vision, loss of color (greyout) or complete loss of vision (blackout), and in some cases, a g-force-induced loss of consciousness. This can occur at as little as 3g (opens in new tab).

However, during simulations of sub-orbital flight paths on a centrifuge (opens in new tab) in people aged 20-78, older people were actually found to better tolerate the high g-forces (opens in new tab) experienced during re-entry through the atmosphere.

Commercial spaceflights are enabling more people to travel to space. (Image credit: Blue Origin)

When New Shepard's engines switch off towards the end of its ascent, allowing it to slow down and start falling back to Earth, the high G-forces abruptly disappear and the passengers feel weightless. In trained astronauts, this rapid entry to microgravity often leads to space sickness (opens in new tab).

The lack of gravity means the position sensors in the ears (called our vestibular system) get confused and can't tell if you're moving, or which way is up or down. Older untrained space tourists, who could already have vestibular impairments (opens in new tab), may be more susceptible to space sickness.

Blue Origin and Virgin Galactic — the spaceflight companies founded by Jeff Bezos and Richard Branson, respectively — are providing only brief glimpses of space. Nonetheless, they will make valuable contributions to our understanding of the health effects of human spaceflight among increasingly diverse groups (opens in new tab) of people.

This article is republished from The Conversation (opens in new tab) under a Creative Commons license. Read the original article (opens in new tab).

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Christopher Newman
Professor of Space Law and Policy, Northumbria University, Newcastle

Christopher J. Newman, BA(Hons), PhD is Professor of Space Law and Policy at Northumbria University at Newcastle in the United Kingdom. He is active in the teaching and research of space law and has published extensively on the legal and ethical underpinnings of space governance. Christopher is regularly invited to lecture in universities and at specialist conferences on space law and policy across the UK and internationally.


Christopher graduated from the University of Sussex with a degree in History with English and American Studies. After working in the Metropolitan Police, he studied at Northumbria University for his Postgraduate Diploma in Law (CPE) and his Postgraduate Diploma in Legal Practice (LPC) and secured a training contract in a small high street firm of Solicitors in Hartlepool. Christopher left legal practice in 2004 and joined the University of Sunderland where he obtained his PhD in Cross-Comparative Public Order Law in 2011, becoming Reader in Law in 2013.