a large machine that does physics experiments with particles (the smallest pieces that everything is made of) a particle accelerator to say that someone broke the law to charge someone with something responsible for breaking a law guilty the lawyers who try to show that someone is guilty the prosecution a particle of light a photon a long metal thing with glass at one end which people use to look at the stars a telescope a system of millions of stars a galaxy to change from bright to less bright and back again, like stars seem to do when we look at them to twinkle https://339efcb25eb75e967b0d-ff8eeadd950d51fd1fc939dca75b3973.ssl.cf1.rackcdn.com/assets_default.swf