SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/cap-rocket-staging

Why do many rockets drop sections, called stages, as they climb?

To shed weight, so the rest accelerates more easily.

Start playing free

  1. To shed weight ✔
  2. To cool the engine
  3. To steer the rocket

Why: Empty tanks and engines are dead weight. Dropping them lets the lighter upper stage keep speeding up and turn toward the sideways speed needed for orbit.

Huh, didn't know that: NASA Glenn gives about 17,478 mph as the orbital velocity for a circular orbit 100 miles up.

The dad joke
Why is it so expensive to go to the moon? Because the costs are out of this world.
Like this card?
Play the game

References

Answer: To shed weight. Empty tanks and engines are dead weight. Dropping them lets the lighter upper stage keep speeding up and turn toward the sideways speed needed for orbit.

  1. NASA Glenn: Flight to Orbit www1.grc.nasa.gov/beginners-guide-to-aeronautics/flight-to-orbit
    most launchers discard some of the weight of the rocket
    Checked 2026-10-10.
  2. NASA Glenn: Flight to Orbit www1.grc.nasa.gov/beginners-guide-to-aeronautics/flight-to-orbit
    For a 100-mile-high orbit around the Earth, the orbital velocity is 17,478 mph.
    Checked 2026-10-10.

Think this answer is wrong? Tap "Challenge this answer" on the card in the game and tell us why.

Test yourself in the game

AerospaceWhy can a rocket engine work in the vacuum of space?AerospaceWhich of the four forces of flight is caused by gravity pulling toward the center of the Earth?AerospaceWhich law of motion explains why a rocket moves forward when hot gas shoots out of its back?

That's stuff everyone should know.