engineers are developing new types of guns that might someday be used to launch satellites as if they were bullets. one such gun can give a small object starting at rest a velocity of 3.5km/s moving it through only 2.0cm

This type of gun, known as a magnetic or railgun, uses electromagnetic forces to accelerate objects to high speeds. By rapidly accelerating a small object over a short distance, it can achieve velocities comparable to those needed to put a satellite into orbit.

The advantage of using a gun to launch satellites is that it can potentially be cheaper and more efficient than traditional rocket launches. Rockets require large amounts of fuel to reach escape velocity, whereas a gun could use electromagnetic forces to achieve similar speeds with less fuel.

However, there are still many challenges to overcome before guns can be used as a practical method for launching satellites. The high acceleration forces involved in such a launch could potentially damage delicate satellite payloads, and the logistics of aiming and firing a gun accurately to place a satellite into a precise orbit are also significant hurdles.

Overall, while guns as satellite launchers represent an exciting potential technology with possible cost and efficiency benefits, there are still many technical and practical challenges that need to be addressed before they can become a reality.