You can't "defy" gravity in the sense of making it disappear. Gravity is a fundamental force that affects everything with mass. What you *can* do is achieve orbit, where the object's forward motion is balanced by the pull of gravity, effectively making it fall around the Earth instead of straight down.

Here's how it works:

* Orbital Velocity: To achieve orbit, an object needs to travel at a specific speed called orbital velocity. This speed depends on the object's altitude above Earth. The higher the altitude, the slower the required speed.

* Escape Velocity: If you want an object to completely break free from Earth's gravity and never return, you need to reach escape velocity. This is about 11.2 kilometers per second (25,000 miles per hour).

Important Note: These speeds are just the minimum required. You could travel faster than escape velocity and still be affected by gravity, just at a weaker pull.

Here's an analogy: Imagine you're on a merry-go-round. The faster you spin, the more you feel like you're being pushed outward. This is similar to how an object in orbit feels the pull of gravity, but because of its forward motion, it never actually falls straight down.