太空步共有多少种?

Is it like Michael Jackso moon walk?

对地面没有要求啦,当重心落在踮起的那只脚上时,另一只脚是不吃力的,只要脚贴在地面轻轻滑过就可以了!

The moonwalk is a dance technique.It became popular around the world after Michael Jackson executed the dance during a performance on stage.It subsequently became his signature move,and is now one of the best-known dance techniques in the world.
The moonwalk dance is like this:initially,the front foot is held flat on the ground,while the back foot is in a tiptoe position.The flat front foot remains on the ground but is slid lightly and smoothly backward past the tip-toe back foot.What is now the front foot is lowered flat,while the back foot is raised into the tiptoe position.These steps are repeated over and over creating the illusion that the dancer is being pulled backwards by an unseen force while trying to walk forward.
（我自己从wikipedia摘抄整理的）

受到的万有引力完全充当向心力,产生指向地心的加速度,使宇航员围绕地球做匀速圆周运动.