Space Tourism: To the Orbit with a Suitcase
Commercial Space tourism is still a tiny market by anyone's standard, but it has definitely arrived - for those who can afford it.
How it all began
 Driven to prove their superiority during the Cold War, as well as to gain a strategic advantage, the U.S.A. and the U.S.S.R. began the "Space Race" during the 1960s. In an astonishingly short time period the U.S. Apollo program landed human beings on the moon and the Soviet Salyut program kept them in orbit for months at a time. Probes began to explore the solar system. Space seemed very close; at one point tickets to the moon and to as-yet-non-existing Space stations were being sold.
After the Space Race ended, a new sense of reality set in. The wild dreams of the 60s and 70s died, and humanity turned its attention Earthward again. Space travel beyond Earth's orbit became the exclusive domain of mankind's robotic explorers, and high-profile tragedies both reaching and returning from orbit provided sobering reminders of the risks of Space travel. By the end of the 20th Century travel into Space was still exclusively the domain of governmental organizations.
However, necessity changed the situation with the dawn of the 21st century. Desperate for funds, the Russian Space Agency began to sell seats on Soyuz launches. Businessman Dennis Tito became the first pay-to-fly Space tourist in April 2001, and since then a handful have followed in his footsteps. Additionally, as of November 2007 Virgin Galatic had pre-sold nearly 200 seats for their space tourism flights, according to the company's president.
Kinds of space travels
Flights at altitudes of less than 100 km do not qualify as true Space flight, but it is possible to see the curvature of the Earth from altitudes as (comparatively) low as 25 km.
Sub-orbital flight is defined as flight at altitudes higher than 100 km but at speeds insufficient to achieve orbit. While there are currently no operators offering sub-orbital flight, the privately funded and built SpaceShipOne in 2004 demonstrated that this is a possible market and the race is on to commercialize it.
Orbital flights. All that sub-orbital stuff is pretty nifty, but these days no one's really ready to accept that you were "in Space" until you've been in orbit around the Earth. There's no single altitude for this (it depends on your orbital velocity), but due to atmospheric drag it's only practical above 350 km. Commonly known as Low Earth Orbit, this is currently the exclusive domain of U.S. Space Shuttles, Russian Soyuz vessels, Chinese Shenzhou craft, and the International Space Station. This itinerary is likely the most expensive in the world.
Trans-orbital flights. Human travel beyond low Earth orbit has not been done since the cancellation of the U.S. Apollo program in 1972. The only programs actively working to re-establish this capability are governmental in nature. However in 2005, Space Adventures announced its intention to work with Russian Spacecraft manufacturer Energia and the Russian Space Agency to offer a roughly one-week two-passenger flight around the Moon (no orbit, no landing) in a booster-equipped Soyuz craft for $100 million per person, as early as 2010. This depends on a customer making a hefty deposit to get the project running, so don't wait for them to announce a flight date to get your name in.
What to do in space?
The sight of the Earth from Space is reputed to be incomparable. At altitudes above the thick atmosphere, the stars cease to "twinkle". Sunrise and sunset lose much of their multicolored glory, but take on greater intensity and speed at orbital and even suborbital velocities.
Freefall is a phenomenon which, while not unique to Space travel, occurs only momentarily on Earth, such as in thrill rides or high-speed elevators. If you experience freefall and don't do some aerobatics and float around the craft, you've wasted a great deal of money.
Food. Although Space food has come a long way in terms of taste and variety in recent decades, the quality and taste is still not up to standards of most connoisseurs of fine cuisine. Your transportation provider may offer some choice in the foods available, but you will ultimately be limited by their willingness to indulge you.
Safety. While more mature technology has made it safer than it was in the 1960s, Space remains an inherently dangerous environment to put yourself in. It is statistically one of the most dangerous places to travel. Cosmic radiation, extreme temperatures, micrometeorites, engineering mistakes, high speeds, explosive fuels, the distance to terra firma, and the lack of atmosphere make any unplanned situation potentially life threatening.
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