Peter Melchior

With data from the new DECam imager, the Dark Energy Survey provides additional clues that galaxy clusters are not isolated objects on the sky but are connected with the cosmic web via filaments. Shown here is the famous Bullet cluster. Image: Dark Energy Survey Galaxy clusters — accumulations of hundreds of galaxies — are said to be the largest gravitationally bound structures in the universe. While this statement is correct as such, it easily conveys an incorrect picture: that of…