It refers to the experience of seeing firsthand the reality of the Earth in space, which is immediately understood to be a tiny, fragile ball of life, "hanging in the void", shielded and nourished by a paper-thin atmosphere. From space, astronauts claim, national boundaries vanish, the conflicts that divide people become less important, and the need to create a planetary society with the united will to protect this "pale blue dot" becomes both obvious and imperative.
Third-hand observers of these individuals may also report a noticeable difference in attitude. Astronauts Rusty Schweikart,  Edgar Mitchell, Tom Jones, Chris Hadfield and Mike Massimino are all reported to have experienced the effect.
- National Aeronautics and Space Administration; Douglas A. Vakoch (6 July 2011). Psychology of Space Exploration: Contemporary Research in Historical Perspective. Government Printing Office. pp. 29–. ISBN 978-0-16-088358-3. Retrieved 9 February 2013.
- Albert A. Harrison (1 April 2007). Starstruck: Cosmic Visions in Science, Religion, and Folklore. Berghahn Books. pp. 92–. ISBN 978-1-84545-286-5. Retrieved 9 February 2013.
- Douglas A. Vakoch. On Orbit and Beyond. Springer. pp. 10–. ISBN 978-3-642-30583-2. Retrieved 9 February 2013.
- "Space Euphoria: Do Our Brains Change When We Travel in Outer Space?", Daily Galaxy, 2008-05-20
- The Human Brain in Space: Euphoria and the “Overview Effect” Experienced by Astronauts, Ian O'Neill, Universe Today, 2008-05-22
- "Space Tourism: Face Time with Earth", Leonard David, Senior Space Writer, SPACE.com, 2006-08-05, Space-ecotourism
- "StarTalk Live at the Bell House, The Astronaut Session", Star Talk Radio, 2012-01-29, 
- Space Ecotourism, Space.com (2006)
- Overview Institute
- Overview, short film from Planetary Collective
- LinkedIn group
- Speech on The Overview Effect and its Importance in Civilization
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