Pale blue dots' like Earth may be rare among habitable worlds

Earth-like worlds with similar land-to-ocean ratios to our planet

Institute for Pale Blue Dots Renamed to Honor Carl Sagan, Will

Mission To The Solar System

9 Things That Make Earth the Perfect Place for Life

In the Search for Life beyond Earth, NASA Dreams Big for a Future

The Hunt Is On for Alpha Centauri's Planets

Mission To The Solar System

Homo Techno #5 - by Jae Seung - Technocrat Manifesto

Mission To The Solar System

Mission To The Solar System

“Fascinating . . . memorable . . . revealing . . . perhaps the best of Carl Sagan's books.”—The Washington Post Book World

Pale Blue Dot: A Vision of the Human Future in Space

There should be billions of Earths out there. Why can't we find them?

Hubble telescope discovers alien 'deep blue' planet

Astronomers Just Doubled the Number of Potentially Habitable