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Hubble and Kepler telescopes may have found first exomoon

May 2, 2019October 10, 2018 by Paul Scott Anderson

Exoplanets – planets orbiting other stars – have been found by the thousands now, with many more to come. But what about exomoons? So far …

Read MoreHubble and Kepler telescopes may have found first exomoon

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Origami-inspired habitats for the Moon and Mars

October 8, 2018 by Paul Scott Anderson

Human habitation of the Moon and Mars might still seem like a far-off dream, but visionaries are already taking incremental steps toward that goal. One …

Read MoreOrigami-inspired habitats for the Moon and Mars

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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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Mercury’s strange chemistry revealed

October 4, 2018 by Paul Scott Anderson

Mercury, the smallest terrestrial (rocky) planet and closest to the Sun, is relatively close to Earth, yet there is much that we still don’t know …

Read MoreMercury’s strange chemistry revealed

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Pink lagoon provides clues to possible Mars life

October 3, 2018 by Paul Scott Anderson

Is there – or has there – been life on Mars? We still don’t conclusively know the answer to that question, but scientists keep finding …

Read MorePink lagoon provides clues to possible Mars life

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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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