A recent listing on a travel platform has introduced a six-day space tourism package priced at a minimum of 5.1 million yuan per person. The itinerary covers spaceport exploration, simulated cabin training, comprehensive rehearsals, and the actual launch. Travelers will board a space-launched spacecraft by Virgin Galactic, experiencing a 90-minute suborbital spaceflight. In response, some netizens quipped about waiting for a budget-friendly space flight option.
What does a suborbital spaceflight entail, and what sights can passengers witness? Why can travelers embark after just basic simulation training, unlike astronauts who undergo rigorous preparation and strict physical selection? Could we eventually see more affordable space tourism options in the future?
Where Do Suborbital Flights Go?
Current space tourism development follows two primary paths: orbital space travel and suborbital flights, also known as suborbital journeys. Yang Yuguang, chair of the Space Transportation Committee at the International Astronautical Federation, explains that orbital space tourism requires accelerating a vehicle to speeds exceeding 7.8 kilometers per second, reaching orbital velocity to enter a path circling Earth, allowing prolonged multi-orbit flight. Compared to orbital travel, suborbital flights demand lower technical complexity and costs, making them the most mature and commercially viable space tourism model today.
Suborbital flight operates at the edge of space, around 100 kilometers or slightly below this altitude. The internationally accepted boundary between Earth's atmosphere and space is the 100-kilometer mark, commonly called the Kármán line; crossing it signifies entry into space. Yang Yuguang notes that the "destination" for suborbital flights is near the Kármán line, but without reaching orbital speeds, the craft cannot sustain an orbit. Instead, its trajectory resembles a high, parabolic arc.
What Can You See During Suborbital Space Travel?
Suborbital space tourism typically takes place during daylight. Yang Yuguang describes that as altitude increases, the sky transitions from light blue to deep blue. Continuing upward near the 80 to 100-kilometer peak, the surrounding sky turns completely black, even while the sun remains brilliantly bright. More intriguingly, passengers can observe stars in off-season patterns. Previously, astronauts' perspectives offered views of the space station's exterior; in suborbital flights, similar experiences emerge. Yang notes that despite the brief stay, the experience shares notable similarities with the space station, such as glimpsing Earth's curved horizon—a visible feature, though with a smaller arc than seen from the station.
Are There Strict Physical Requirements for Suborbital Travel?
The newly listed space product on the platform imposes no age or physical condition restrictions on travelers. Is extended physical and psychological training unnecessary for this adventure? Yang Yuguang clarifies that suborbital flights have more lenient physical requirements than orbital missions. Since the maximum g-force duration is short, most healthy individuals without conditions like heart disease or severe hypertension can withstand it. Although long-term astronaut training isn't required, a basic health assessment and short-term learning adaptation are still advisable.
Can We Expect Affordable Space Tourism Soon?
Current space tourism packages cost millions of yuan, but Yang Yuguang emphasizes that reusable technology is critical for achieving true mass-market accessibility. Notably, the two companies now operating commercial suborbital flights both employ reusable approaches. Blue Origin's "New Shepard" rocket features vertical takeoff and landing capabilities, allowing multiple reuses, and uses liquid hydrogen and liquid oxygen propellants that burn to produce only water, avoiding carbon buildup and enhancing reusability. Meanwhile, a large carrier aircraft lifts Virgin Galactic's rocket plane to high altitudes, also enabling repeated use.
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