ESA Euronews: Flying Zero-G

If you fly a plane in the right way at the right speed, you can be weightless for a few seconds. By throwing the aircraft into an orbit-like path within Earth's atmosphere, you can enter the wonderful world of weightlessness.
It is one of the best ways to simulate the environment of space, and a valuable experimental tool for scientists with a special interest in microgravity. If they want to find out how the brain works, study the natural posture of humans in space, or how water boils in a weightless environment, this is the way to do it.
Take a journey into a free-floating world of the parabola in this edition of Space.