Conglomerate, in geology, a sedimentary rock composed of rounded rock fragments cemented together by a finer-grained material such as sand or clay. The fragments, which are commonly quartz or limestone but can be almost any type of rock, originally may have accumulated on beaches or in beds of streams.
Every day, astronomers unravel a little more of the universe's inner workings, but the jury is still out on 95 percent of its contents.
Modern science allows us to break atoms down into tiny components. But can scientists use their mighty machines to recreate the foundation of the universe?