The mechanics of leaving Earth
Why a rocket, not a plane? What does weightlessness actually feel like — and why? How heavy do you get on the way up, and how do you train for it? The physics of space travel, in plain English.
Why it takes a rocket
Space is about speed, not just height
Reaching the edge of space is "only" about 100 km up. But staying there — orbiting — means going sideways fast enough that you keep falling around the Earth instead of back into it: roughly 28,000 km/h. That enormous speed is why orbit costs so much more than a suborbital hop.
Rockets carry their own air
A jet engine breathes air to burn fuel, so it stops working where the air runs out. A rocket carries both fuel and its own oxidiser, so it can keep thrusting in the vacuum of space. That's the whole reason we launch on rockets rather than fly up on planes.
Reusability is the game-changer
Traditionally every rocket was thrown away after one flight. Boosters that land themselves and fly again — pioneered for orbit by SpaceX's Falcon 9 and for suborbital by Blue Origin's New Shepard — are what turned launch from a fortune into a fare.
Coming home is half the problem
Everything that goes up carries huge energy that must be shed to land safely — through heat shields, parachutes, wings or engine burns. Re-entry, not launch, is often the most demanding part of the ride.
What the ride feels like
Two sensations define spaceflight: getting suddenly heavy, then suddenly weightless.
G-forces — feeling several times heavier
During the hard push of launch and the deceleration of re-entry, passengers typically feel about 3–4 g — three to four times their normal weight — pressing them into the seat. Some suborbital profiles peak higher for brief moments. It's intense but brief, which is why operators screen health and run passengers through practice runs.
Weightlessness — and why it happens
Floating in space isn't the absence of gravity — it's free fall. You and your spacecraft fall together, so there's nothing to press you against a seat, and you float. On a suborbital hop this lasts a few minutes at the top of the arc; in orbit it's continuous, because you're falling around the planet endlessly.
How much training you'll need
Training scales with the trip. The higher and longer you go, the more there is to learn.
Effectively none
A gentle stratospheric ride needs little more than a safety briefing — no g-forces, no weightlessness to prepare for.
Days
A short program covering the g-force profile, cabin procedures, how to move during the weightless minutes, and emergency drills — typically completed in the days before flight.
Weeks to months
Private orbital crews train for weeks or months: spacecraft systems, spacesuit operations, living in microgravity, science procedures, and extensive emergency scenarios before a launch and roughly two weeks in orbit.
Basic health and fitness screening applies across the board — but you don't need to be a fighter pilot. Passengers to date have spanned a wide range of ages and backgrounds.
Is it safe?
Engineered for it, not risk-free
Crewed vehicles are built with launch-escape systems, redundant components and rigorous testing. But spaceflight remains one of the most demanding things humans do, and every operator is candid that it carries real, non-zero risk.
Radiation & the environment
Above the atmosphere, cosmic radiation exposure rises — though on short trips the total dose stays relatively low. Microgravity, confined cabins and extreme temperatures outside all shape how vehicles are designed and how crews are screened.
Quick answers
Do I need to be an astronaut or pilot?
No. Every operator selling civilian seats provides the required training. You need to meet basic health criteria, but no professional background is necessary — suborbital and orbital passengers have included people well into their 80s and 90s.
Where does "space" actually begin?
There's no universal line. The internationally common definition is the Kármán line at 100 km; the U.S. awards astronaut wings above 80 km. Balloon flights reach about 30 km — high enough for the view, but below both marks.
How long am I actually weightless?
A few minutes on a suborbital hop; continuously for the whole mission in orbit — days on a free-flyer, up to about two weeks on a station stay.
What's the cheapest way to reach space?
Among rocket flights, suborbital is far cheaper than orbital — hundreds of thousands of dollars versus tens of millions. Balloon near-space flights are cheaper still, but don't technically cross into space.
Can I go to the Moon as a tourist?
Not yet. Crewed lunar travel today is government-led, though private lunar trips have been proposed. A crewed flyby has already flown; a landing is targeted for later this decade.
What's launching next?
See the milestones, missions and timelines shaping the next decade of human spaceflight.
News & the road ahead ↗