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NASA

NASA back in the search for alien technosignatures

October 5, 2018 by Paul Scott Anderson

Here’s a buzzword you might or might not have heard before: technosignatures. SETI pioneer Jill Tarter has proposed that the search for extraterrestrial intelligence (SETI) …

Read MoreNASA back in the search for alien technosignatures

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Let NASA take you on a virtual trip to exoplanets

June 14, 2018June 14, 2018 by Paul Scott Anderson

Many of us dream about being able to go into space and visit different planets in our Solar System or even venture to more distant …

Read MoreLet NASA take you on a virtual trip to exoplanets

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NASA live science chat tomorrow: New evidence for water vapour plumes on Europa?

May 13, 2018May 13, 2018 by Paul Scott Anderson

NASA will be hosting a live stream update tomorrow about Jupiter’s moon Europa with new analysis as to the habitability of this ocean world. Tune …

Read MoreNASA live science chat tomorrow: New evidence for water vapour plumes on Europa?

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Titan quadcopter or comet sample-return? NASA announces competition finalists for 2020s mission

February 26, 2018December 27, 2017 by Paul Scott Anderson

Wednesday was an exciting day for space exploration enthusiasts, as NASA announced the two finalist missions selected as part of its New Frontiers Program – …

Read MoreTitan quadcopter or comet sample-return? NASA announces competition finalists for 2020s mission

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What are those weird dark streaks on Venus? NASA CubeSat mission could find out

August 26, 2017August 22, 2017 by Paul Scott Anderson

Even though Venus is Earth’s closest planetary neighbour, it is still one of the most mysterious. Numerous landers and orbiters have visited this extremely hostile …

Read MoreWhat are those weird dark streaks on Venus? NASA CubeSat mission could find out

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About Planetaria

About Planetaria



Pluto backlit by the Sun, as seen by New Horizons in 2015

Planetaria (formerly The Meridiani Journal) is a chronicle of planetary exploration, both in our own Solar System and beyond. Many continuing discoveries, such as the geysers of Enceladus, the subsurface ocean of Europa, the methane rivers, lakes and seas of Titan, the mountains and glaciers of Pluto, the cold but beautiful deserts of Mars and the thousands of exoplanets orbiting other stars make this an exciting time of exploration and discovery.

I publish Planetaria as a personal blog, a complement to my other freelance space writing for EarthSky and AmericaSpace.

- Paul Scott Anderson

Exoplanet Count

Exoplanet Count

Current Confirmed: 3,946
Current Candidates: 3,520
Potentially Habitable: 49

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