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    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. […]

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    If ET Calls, Think Twice About Answering

    Why some say searching for ET is best done quietly.

  • Dahm_HERO

    Virtual Reality Poses the Same Riddles as the Cosmic Multiverse

    Alt-realities, whether cosmic or VR, would undermine the laws of physics.

  • Adams_HERO

    The Not-So-Fine Tuning of the Universe

    There’s more than one way to build a universe suitable for life.