female sterilization is commonly referred to as tubectomy. Tubectomy is a surgical procedure in which a woman's fallopian tubes are blocked, cut, or sealed to prevent eggs from reaching the uterus for fertilization. This method of permanent contraception is also known as tubal ligation.

Helium: It is an inert gas that is lighter than air. It is non-flammable.

A geostationary orbit, geostationary Earth orbit or Geosynchronous Equatorial Orbit (GEO), is a circular orbit 35786 km (22236 mile) above the Earth’s equator and following the direction of the Earth’s rotation. An object in such an orbit has an orbital period equal to the Earth’s rotational period (one sidereal day).