Imminent: Inside the Pentagon's Hunt for UFOs: Written by the Former Head of the Pentagon Program Investigating UAPs―Featured on the Joe Rogan Experience Podcast and the Daily Show with Jon Stewart

Merlin's Tour of the Universe, Revised and Updated for the Twenty-First Century: A Traveler's Guide to Blue Moons and Black Holes, Mars, Stars, and Everything Far

Behold a Pale Horse

Astrophysics for People in a Hurry

Astrophysics for People in a Hurry

Gory Details

Merlin’s Tour of the Universe, Revised and Updated for the Twenty-First Century: A Traveler’s Guide to Blue Moons and Black Holes, Mars, Stars, and Everything Far

Reentry: SpaceX, Elon Musk, and the Reusable Rockets that Launched a Second Space Age

A City on Mars: Can we settle space, should we settle space, and have we really thought this through?

Starry Messenger: Cosmic Perspectives on Civilization