It is 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, 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.[quote] 
The thing that really surprised me was that it [Earth] projected an air of fragility. And why, I don’t know. I don’t know to this day. I had a feeling it’s tiny, it’s shiny, it’s beautiful, it’s home, and it’s fragile.
Cosmonaut Yuri Gagarin and astronauts Michael Collins, Ron Garan, Rusty Schweikart, Edgar Mitchell, Tom Jones, Scott Kelly, James Irwin, Mike Massimino, André Kuipers, Chris Hadfield, Sally Ride, and Anne McClain are all reported to have experienced the effect.
In 2018, the Spacebuzz project was created so "children around the world can also get to experience the Overview Effect." It was announced in a press release on December 20 by astronaut André Kuipers on the European Space Agency's (ESA) website. Spacebuzz aims to give children an overview effect like experience using virtual reality (VR) in order to have the same insight astronauts have when seeing planet Earth from space. Spacebuzz is a project started by the Overview Effect Foundation backed by ESA and the Netherlands Space Office.
In August 2020 anthropologist Deana L. Weibel introduced the parallel term "ultraview effect," a subjective response of intense awe some astronauts have experienced viewing large "starfields" while in space, and discussed the impact of the overview effect and the ultraview effect on astronauts' religious beliefs.
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- O'Neill, Ian (22 May 2008). "The Human Brain in Space: Euphoria and the "Overview Effect" Experienced by Astronauts". Universe Today.
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- Feloni, Richard (19 March 2018). "NASA astronaut Scott Kelly explains how seeing planet Earth from space changed his perspective on life". Business Insider. Retrieved 19 March 2018.
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- "Space Tourism: Face Time with Earth", Leonard David, Senior Space Writer, SPACE.com, 2006-08-05, Space-ecotourism
- De Luce, Ivan (July 16, 2019). "Something profound happens when astronauts see Earth from space for the first time". Business Insider. Retrieved July 28, 2019.
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- Sample, Ian (26 December 2019). "Scientists attempt to recreate 'Overview effect' from Earth". The Guardian. ISSN 0261-3077. Retrieved 2019-12-28 – via www.theguardian.com.
- Weibel, Deana (13 August 2020). "The Overview Effect and the Ultraview Effect: How Extreme Experiences in/of Outer Space Influence Religious Beliefs in Astronauts". Religions. 11 (8): 418. doi:10.3390/rel11080418. S2CID 225477388.
- Space Ecotourism, Space.com (2006)
- Overview Institute
- Overview, short film from Planetary Collective
- Speech on The Overview Effect and its Importance in Civilization, 5 minute talk by JP Chastain at Ignite Boise (2012)