Astrobiology is the science that seeks to understand the story of life in our universe.
Astrobiology includes investigation of the conditions that are necessary for life to emerge …

This book argues that alien rule can become legitimate to the degree that it provides
governance that is both effective and fair. Governance is effective to the degree that citizens …

In the present paper (originally presented at the First IAA Symposium on Searching for Life
Signatures hold at the UNESCO on 22–26 September 2008) I try to summarize the results of …

Existential risks threaten the future of humanity, but they are difficult to measure. However, to
communicate, prioritize and mitigate such risks it is important to estimate their relative …

As a guide for astronomers new to the field of technosignature search (ie SETI), I present an
overview of some of its observational and theoretical approaches. I review some of the …

Astrobiology is an expanding, interdisciplinary field investigating the origin, evolution and
future of life in the universe. Tackling many of the foundational debates of the subject, from …

We estimate the relative likelihood of success in the searches for primitive versus intelligent
life on other planets. Taking into account the larger search volume for detectable artificial …

Extraterrestrial technology may exist in the Solar System without our knowledge. This is
because the vastness of space, combined with our limited searches to date, implies that any …

Throughout history, humans have explored new places, making both good and bad moral
decisions along the way. As humanity proceeds to explore space, it is important that we …

Im Jahre 1978 las ich mit einiger Faszination die deutsche Übersetzung des Buches The
Colonization of Space 1 des US-amerikanischen Physikers und Visionärs Gerard O'Neill …