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Method Choosing and creating the abstracts 24 traditional abstracts were chosen (with permission of the authors) from Volume 92 (2000) of the JEP by selecting every fourth one available. Data from Pennebaker's Linguistic Inquiry and Word Count (LIWC)Preferences for the traditional abstracts My ratings are 2 for the structured abstract and 1 for the traditional one. Now billionaire Virgin CEO Richard Branson and Amazon CEO Jeff Bezos have followed in his footsteps.

On July 11 Branson blasted off into suborbital space via his company Virgin Galactic, while Bezos' Blue Origin rocket spent 11 minutes in suborbital space on July 20.

Reflecting on his momentous journey two decades on, Tito is gleeful when describing the moment the rocket first went into orbit. I mean, it was the greatest moment of my life, to achieve a life objective, and I knew then that nothing could ever beat this. Tito has been keenly keeping an eye on updates in the space tourism field -- he says he hopes many others will one day be able to experience the thrill of a trip to space.

When Tito embarked on his history-making trip in 2001, he was working in finance, but he'd started his career in aeronautics and astronautics. Tito had been fascinated by space ever since he was a kid, and reckons he was paving the way for a space sojourn even then. That was the year that Soviet cosmonaut Yuri Gagarin became the first human to travel to space.

Later, when he changed careers and no longer worked in the aeronautics arena, Tito continued to dream of his own space flight. He recommenced these conversations later that decade. Tito spent the next week on board the ISS.

It was just wonderful," Tito recalls. It was the best experience of my whole life, those eight days. There haven't been any space tourists since 2009, which Space Adventures' representative Stacey Tearne puts down to the fact the US Space Shuttle program was retired, leaving Russian Soyuz craft as the only option for getting to and from the ISS. Tearne tells CNN Travel that Space Adventures is confident the landscape will change again.

Deep-pocketed travelers will be able to book a seat on Boeing's Starliner spacecraft -- seen here after it landed in White Sands, New Mexico in December 2019 following a test flight -- once it starts flying to the ISS.

The company also has the rights to market seats on board Boeing's Starliner space capsule to private individuals, once operational flights to the ISS commence. In the more immediate future, Space Adventures is planning a trip for late 2021 via SpaceX's Crew Dragon spacecraft. NASA helped fund the development of Boeing's Starliner and SpaceX's Crew Dragon, but both companies remain privately owned, so they'll still have the option to sell seats aboard their spacecraft to anyone who can afford them.

The US space agency has changed its tune on space tourism since Tito's historical trip, announcing back in 2019 plans to open the ISS to tourists. Orbital space tourismUS company SpaceX is planning orbital trips to space later in 2021, via its Crew Dragon aircraft, pictured here in May 2020, not long before becoming the first commercial spaceship to send NASA astronauts to space.

Not all space tourism is equal. There's a marked difference between a trip to orbital space -- involving gravity-busting high-speed takeoffs and longer durations -- and suborbital space, in which travelers are briefly exposed to weightlessness and views of space during a flight to the edge of the atmosphere, 60 miles above Earth. US company SpaceX, founded by Elon Musk with the goal of eventually flying humans to Mars, is perhaps the biggest hitter in the orbital space tourism arena.

Billionaire Shift4 Payments CEO Jared Isaacman, who'll be one of those on board, is funding the trip. Among those joining him will be Hayley Arceneaux, a 29-year-old cancer survivor and physician assistant at St. Jude children's hospital in Tennessee. Arceneaux is set to be the youngest American to visit space, and the first person with a prosthesis to journey into space. Arceneaux, Isaacman and the rest of the crew are currently undergoing training for the journey, which is set to last several days.

SpaceX also signed a deal with Axiom, a startup founded by former NASA Administrator Michael Suffredini, to take a group of "private astronauts" to the ISS aboard a Crew Dragon in the second half of 2021.

SpaceX hopes Starship will take Japanese billionaire Yusaku Maezawa and a group of artists to the moon in 2023. Musk also intends Starship to carry humans to Mars one day. Now 80, Dennis Tito isn't sure if a return to space is in his future, but he's excited about movements in the orbital space tourism field. He figures they'll probably go for a younger crew. Branson was on board the company's milestone test flight on July 11, alongside two pilots and four other Virgin Galactic employees.

Virgin Galactic hopes these suborbital space flights will be available for paying members of the public by 2022. Blue Origin is also setting its sights on suborbital space tourism and launched founder Jeff Bezos to the edge of space on July 20. Also on board was Bezos' brother Mark and 18-year-old Oliver Daemen, whose dad purchased his ticket for an undisclosed amount. They were joined by Wally Funk, an 82-year-old pilot who trained to be an astronaut 60 years ago but hadn't had the opportunity to go to space until now.

The auction money went to Blue Origin's STEM education charity Club for the Future, who donated it to space-related non-profits. The price tags attached to space tourism have drawn criticism from those who say the money could be better spent solving problems on Earth -- a point Bezos has partly conceded. Other suborbital concepts include Florida company Space Perspective, which hopes to fly passengers to the edge of space in a high-tech version of a hot air balloon.

NASA scientist: 'You're not going to be able to keep people away'Jeffrey A. Hoffman, a former NASA astronaut who now works in MIT's Department of Aeronautics and Astronautics, says he's "very enthusiastic" about space tourism as a concept.

Hoffman describes looking back at the Earth from space as being a reminder that "we're all in it together. Not only that, being in space is fun, says Hoffman. He says the feeling of weightlessness, which is hard to imagine for those of us who've remained Earthbound, is incredibly pleasant. Hoffman, former NASA astronaut and MIT professor"When you look at the travel industry, certain things are available to the general population, and certain types of tourism are only available at a much higher economic level.

But gradually, things do tend to trickle down. In 2014, a test pilot was killed during a Virgin Galactic test flight, while SpaceX and Blue Origin test rockets have exploded, with no injuries.

Hoffman says that, as with air travel, there will always be risk of accidents, but a consistent safety record will help get the concept off the ground. While the launch dates of many of space tourism concepts have been pushed back several times, Hoffman is confident this year could be significant. Would he consider returning to space as a tourist.