This Will Help You Grasp the Sizes of Things in the Universe
Caleb Scharf wants to take you on an epic tour. His latest book, The Zoomable Universe, starts from the ends of the observable universe, exploring its biggest structures, like groups of galaxies, and goes all the way down to the Planck length—less than a billionth of a billionth of a billionth of a meter. […]
If ET Calls, Think Twice About Answering
Aliens:Why some say searching for ET is best done quietly.
Virtual Reality Poses the Same Riddles as the Cosmic Multiverse
Technology:Alt-realities, whether cosmic or VR, would undermine the laws of physics.