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geology

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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Wow! New volcano on Jupiter’s moon Io

July 29, 2018 by Paul Scott Anderson

When it comes to volcanoes, we naturally tend to think of big eruptions like the recent ones in Hawaii or Mount St. Helens in Washington …

Read MoreWow! New volcano on Jupiter’s moon Io

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Astronomers find ‘ghost dunes’ on Mars

July 17, 2018 by Paul Scott Anderson

Mars is a desert planet, a lot like some deserts on Earth, but much colder. Also just like Earth, the Martian deserts have vast dunes, …

Read MoreAstronomers find ‘ghost dunes’ on Mars

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Curiosity rover finds seasonal clues about Martian methane and investigates unusual ‘stick’ formations

February 26, 2018January 8, 2018 by Paul Scott Anderson

As we enter 2018, NASA’s Curiosity rover continues to be busy exploring on top of Vera Rubin Ridge, on the lower flanks of Mount Sharp. …

Read MoreCuriosity rover finds seasonal clues about Martian methane and investigates unusual ‘stick’ formations

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Hotsprings in Gale crater? Curiosity rover finds new evidence for ancient hydrothermal activity

August 28, 2017 by Paul Scott Anderson

NASA’s Curiosity rover has found even more evidence for a previously habitable environment in Gale crater on Mars, according to a new study just published. …

Read MoreHotsprings in Gale crater? Curiosity rover finds new evidence for ancient hydrothermal activity

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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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