You probably mean Large Hadron Collider. It is a particle accelerator (biggest in the world) at CERN in Switzerland. It is designed to accelerate nuclei of heavy atoms and collide them to study high energy reactions and see if new unknown subatomic particles can be discovered. Hadrons are the class of particles including protons, neutrons, and mesons. Large refers to the size of the machine, not the size of the hadrons. The first particle they hope to find is the "Higgs Boson", which according to some new theories determines the mass of all other subatomic particles.
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Rubidium is highly reactive and if it is added to cold water there will be a large, exothermic reation; rubidium hydroxide and hydrogen are formed.
The hydrogen bonds result in a structure that contains large holes.
A nebula, a large cloud of hydrogen gas, comes together under its gravity over a long period of time. One trigger may be perturbation from nearby supernovas.
An antihydrogen is an atom of the antimatter equivalent of hydrogen, or the antimatter equivalent of hydrogen as a collective.
The number of neutrons in hydrogen depends on the isotope. Protium,deuteriumand tritium have 0, 1 and 2 neutrons respectively.