Cpep Tank Tops

Description: Contemporary Physics Education Project (CPEP) History of the Universe map

Description: This image shows a typical atomic nucleus. Each nucleus contains three quarks which are held together by the strong force created by gluons.

Description: This waveform (GW150914) is that of the first observation of gravitational waves on 2015-09-14. It was also the first observation of a binary black hole merger and demonstrates the existence of binary stellar-mass black hole systems.