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Juno

Jupiter’s growing pains, explained

September 7, 2018September 7, 2018 by Paul Scott Anderson

Jupiter is sometimes called the king of the planets in our Solar System, due to its enormous size. It has some 300 times Earth’s mass. …

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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 discover 10 new moons for Jupiter

July 22, 2018 by Paul Scott Anderson

Our Solar System is full of moons of many different kinds, just as diverse and amazing as the planets they orbit. While Earth only has …

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Juno gets science mission extension and solves electrifying mystery on Jupiter

June 11, 2018June 11, 2018 by Paul Scott Anderson

NASA’s Juno spacecraft has shown Jupiter in ways never seen before, not only sending back incredibly detailed images of the beautifully turbulent atmosphere, but also …

Read MoreJuno gets science mission extension and solves electrifying mystery on Jupiter

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Io’s fiery volcanoes in infrared

April 25, 2018April 11, 2018 by Paul Scott Anderson

All volcanoes, all the time – that’s what it’s like on Jupiter’s moon Io, which is volcanically active on pretty much a constant basis. These …

Read MoreIo’s fiery volcanoes in infrared

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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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