One concern De Roeck discussed is an “unidentified lying object” that could disrupt the accelerator’s beam. Phys.org says physicists believe it’s something to be “cautiously aware of.” It hasn’t caused a problem in the testing so far. “The unidentified lying object turns out not to be a problem for the operation, it’s just something to keep an eye on,” De Roeck said. “It’s in the vacuum tube and it’s not a problem if it doesn’t move and remains stable.” And if it moves? MORE