In this work he predicted the manned colonization of the universe in 16 phases:

1. Design of rocket-propelled airplanes with wings.

2. Progressively increasing the speeds and altitudes reached with these airplanes.

3. Designing of a pure rocket without wings.

4. Developing the ability to land on the ocean surface by rocket.

5. Reaching of escape velocity and first flight into space.

6. Lengthening of the rocket flight time into space.

7. Experimental use of plants to make an artificial atmosphere in spacecraft.

8. Using of pressurised space suits for activity outside spacecraft.

9. Making of orbital greenhouses for plants.

10. Building of the large orbital habitats around the earth.

11. Using solar radiation to grow food, to heat space quarters, and for transport needs throughout the solar system.

12. Colonization of the asteroid belt.

13. Colonisation of the entire solar system and beyond.

14. Achievement of individual and social perfection.

15. Overcrowding of the solar system and galaxy colonisation.

16. The sun begins to die and the people remaining in the solar system's population move to other solar systems.

In the 1920's members of the VfR (Society for Space Travel) amused themselves by redesigning Verne's moon gun. In 1926 rocket pioneers Max Valier and Hermann Oberth designed a gun that would rectify Verne's technical mistakes and be actually capable of firing a projectile to the moon.

Goddard achieves the first flight of a liquid-propellant rocket at Aunt Effie's Farm, Auburn, Massachusetts. Altitude 41 ft; average speed 60 mph; in air 2.5 sec; landed 184 ft from launching frame; total path 220 ft. This event was the "Kitty Hawk" of rocketry.

After several tests indicating the model was too small to permit refinements, Goddard decided to build a rocket twenty-fold larger. During 1926 a new tower was built, and flow regulators, multiple liquid injection into large combustion chambers, means for measurement of pressure and lifting force, electrically fired igniter, and turntable for rotation were developed.