Momentum Exchange Tethers are one of many applications for space tethers. A tethered balloon is held down by one or more mooring lines or tethers. A kite consists of wings, tethers and anchors. There is a requirement for spacewalking astronauts to use tethers and sometimes supplementary anchors. The sails are replaced with straightened conducting tethers (wires) placed radially around the host ship. Her Omni-provided weaponry include twin cannons, shields, and explosive tethers. Simple single-strand tethers are susceptible to micrometeoroids and space junk. Another proposed method is to use spinning electrodynamic tethers instead of hanging tethers. Wheel tethers and extra crash structures are also added to the car. All space tethers are susceptible to space debris or micrometeroids. Proposed concepts for addressing this issue include non-rocket spacelaunch, momentum exchange tethers, and space elevators. They began by unpacking tools, safety tethers and work platforms. A number of space tethers have been deployed in space missions. A group of tethers is called a tension leg.