The  Large Hadron Collider (LHC) that started preliminary experiments on September 10, 2008 in  CERN, Geneva, and the planned  International Linear Collider (ILC) will carry out a series of experiments in the future to validate the  standard model of  particle physics. The model predicts that  Higgs boson particles gives mass to all fundamental particles and explains the existence of  dark matter, or invisible matter in between galaxies. 
The LHC is a 27 kilometer long circular high energy  particle accelerator which took more than 20 years and USD $9 billion to build. In the next few weeks the machine will collide opposing beams of  protons charged with approximately 7 TeV of energy resulting in cataclysmic conditions that will mimic the beginning of time, a re-creation of the  Big Bang.
An upgraded version of the LHC was announced, nicknamed the "super LHC". The new accelerator will perform ten times the number of collisions as the current LHC over the same time. The upgrade will feature a new injection system and enhanced detectors to cope with the increase in data packets from collisions.
The bigger International Linear Collider, nicknamed "Einstein's telescope", is planned by the International Technology Recommendation Panel (ITRP). The ILC will have a collision energy of 500 GeV and will collide  electrons with particles of  antimatter, called  positrons, along a 30-40 km completely straight tunnel. The ILC's two giant "guns" pointing at each other would be able to accelerate electrons and positrons to near-light speeds before smashing them together. 
"The LHC smashes protons together to discover new particles but also generates lots of debris that obscures the fine detail. The ILC would be a much cleaner machine and tell us far more about their real nature." says  Brian Foster, professor of experimental physics at Oxford University and European director of the project. The host country for the ILC has not yet been chosen but it is planned to have the machine constructed by late 2010. The new machine will cost an estimated USD $7 billion to build. Physicists hope that ILC might be able to resolve some of the questions raised by Einstein's theories of relativity. 

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Large particle accelerators to explore the frontiers of physics