Rockets, explained from zero

You do not need an engineering degree to understand rockets; you need about twenty minutes and the right order of ideas. This guide sequences the wiki's explainers so each article sets up the next, ending with the actual vehicles flying today.

Step 1: the physics you cannot skip

Start with how rockets work. Two ideas carry everything: rockets move by throwing mass out the back (Newton's third law), and the rocket equation punishes them for it, forcing designs that are about 90 percent propellant. Once the phrase 'tyranny of the rocket equation' makes sense, every design choice in the industry follows logically.

Step 2: orbit is a speed, not a place

Next, orbital mechanics. Reaching space is easy; staying there means going sideways at 7.8 kilometers per second. This explains why rockets tilt over immediately after liftoff, why 'suborbital' tourist hops are a different sport from orbital flight, and why coming home requires slowing down and surviving the heat. The glossary covers the vocabulary (delta-v, perigee, transfer window) as you hit it.

Step 3: why landing rockets changed everything

Then read reusable rockets. Throwing away an airliner after one flight would make tickets absurd; rockets worked that way until 2015, when a Falcon 9 booster first landed. Reuse is why one company now launches more than the rest of the planet combined, and why every serious new rocket is designed to come back: New Glenn, Starship, Rocket Lab's Neutron, and China's Zhuque-3 and Long March 10B. China joined the club on July 10, 2026, when the first stage of a Long March 10B was caught in a net strung across a recovery ship 430 kilometers downrange, using four hooks instead of landing legs. It was the first orbital-class booster recovery by any country other than the United States.

Step 4: meet the fleet

Now the vehicles make sense. The workhorse: Falcon 9, which together with Falcon Heavy had flown 687 times through August 8, 2026. The heavy lifters: Falcon Heavy and New Glenn, the latter grounded since a booster exploded on a test stand in May 2026. The giants: Starship, thirteen test flights in and not yet orbital, and NASA's SLS, which has flown twice. The specialists: Electron for small dedicated payloads, with 92 flights since 2017; Ariane 6 for European autonomy; Vulcan for US national security, which has not flown since February 2026 after a second solid booster nozzle failure; and Soyuz, the long-serving veteran. Rocket Lab's reusable Neutron is due to debut no earlier than the fourth quarter of 2026. The size comparison chart puts them all on one scale.

Step 5: go deeper where it gets interesting

From here, follow your curiosity: the Saturn V for how the 1960s did it, the comparisons for head-to-head specs, the timeline for how the fleet got here, or the upcoming launches page to watch it fly this week.

Frequently asked questions

Why do rockets have stages?

Because hauling empty tanks is wasted effort. Dropping dead weight mid-flight lets the remaining engines push a lighter vehicle, and the rocket equation makes this almost mandatory for reaching orbital speed. See how rockets work.

Why did it take until 2015 to land a rocket?

Landing costs propellant and payload margin, and until engines, computing, and control matured it usually failed. The Shuttle tried partial reuse with heavy refurbishment costs; propulsive booster landing finally made the economics work. See reusable rockets.

How much does a launch cost?

About 7.5 million dollars list price for a small dedicated Electron, 74 million for a Falcon 9 under SpaceX's published rates through 2026, and 100+ million for traditional heavy rockets. NASA's inspector general costed a single Artemis launch, counting SLS, Orion, and ground systems together, at 4.1 billion dollars for each of the first four missions. Per kilogram, big reusable rockets are cheapest, which is why rideshare on Falcon 9 dominates small-satellite launch.

What fuels do rockets use?

Mostly kerosene (Falcon 9, Soyuz), hydrogen (SLS core, Ariane 6), or methane (Starship, New Glenn, Vulcan), each burned with liquid oxygen, plus solid boosters for raw liftoff thrust. Methane is the trend: clean-burning for reuse and makeable on Mars.

How many rockets reach orbit each year?

More than 320 orbital launches were attempted worldwide in 2025, a record. SpaceX flew 165 of them and carried roughly 85 percent of all satellites deployed that year; China, the second most active country, launched 92 times. The upcoming launches page tracks what is flying next.