Helium
Element 2 · chemical symbol: He
These Vrulum profiles mention Helium by name. Read each profile for its specific context; a mention alone does not establish composition, performance or use of the pure element.
For periodic-table data and other properties, consult the Royal Society of Chemistry periodic table.
Related technology profiles
Commercial lunar landers
Privately built robotic landers now carry science and technology payloads to the Moon, mainly under NASA's Commercial Lunar Payload Services (CLPS) programme. Of the four named landing attempts reviewed here, one landed and operated for about one lunar day, two landed but tipped onto their sides, and one never landed.
Magnetic levitation
Magnetic levitation uses magnetic forces to support an object without contact. Maglev trains and laboratory demonstrations show that it works, but stable support usually depends on a purpose-built track or supporting structure, so it is not the same as a free-floating board.