Where does this come from, and can I check it?

The rocket equation ties speed to the ratio of full to empty mass. The figure is taken from NASA Glenn, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.

Is this really a space fact?

Yes. It sits on the Space shelf, one of 2,600 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.

What else can I read about it?

The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.

Mondo Knows Facts

Most of a rocket is the fuel to lift the fuel

The rocket equation ties speed to the ratio of full to empty mass Because exhaust velocity is fixed by chemistry, a rocket must carry exponentially more propellant to gain more speed. That is why launchers are staged, dropping empty tanks as they climb. A single stage to orbit needs a mass ratio far beyond what structures allow. It sits in Mondo's space collection, one of 200 facts that each trace back to the reference below.

Where this comes from

NASA Glenn

Facts that can change over time are reviewed and updated. If something here looks wrong, Mondo would rather know than be confidently incorrect.

Go further

Science trivia

More facts like this

Orbiting low means moving fastAt 400 kilometres altitude a satellite needs nearly 8 kilometres a second There are five gravitational parking spots near EarthAt L4 and L5 a spacecraft can hold a stable position with minimal fuel Space is completely silent because sound needs a medium to travelWithout air or gas particles sound waves cannot propagate through the cosmic vacuum Black holes slowly evaporate over time via Hawking radiationQuantum effects near the event horizon cause black holes to lose mass Geostationary orbit sits 35,786 kilometres upAt that height one lap takes exactly a day, so the satellite hangs still Baikonur is the oldest working spaceportSputnik 1 and Yuri Gagarin both launched from the same Kazakh site

Tags: rockets, physics, staging

Most of a rocket is the fuel to lift the fuel: the short answers

Where does this come from, and can I check it?: The rocket equation ties speed to the ratio of full to empty mass. The figure is taken from NASA Glenn, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.
Is this really a space fact?: Yes. It sits on the Space shelf, one of 2,600 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.
What else can I read about it?: The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.