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Paul Scott Anderson

Asteroid Itokawa gives up its secrets

September 12, 2018 by Paul Scott Anderson

Back in 2005, the first asteroid sample-return mission – Japan’s Hayabusa spacecraft – reached its target, the asteroid Itokawa. In 2010, Hayabusa (Japanese for “peregrine falcon”) …

Read MoreAsteroid Itokawa gives up its secrets

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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. …

Read MoreJupiter’s growing pains, explained

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Mapping new worlds: Researchers release first global maps of Pluto and Charon

July 25, 2018 by Paul Scott Anderson

When New Horizons sped past Pluto and its moons in July 2015, it revealed some incredible new worlds to explore. They are no longer just …

Read MoreMapping new worlds: Researchers release first global maps of Pluto and Charon

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Planet-hunter Kepler keeps going as fuel dwindles

June 5, 2018 by Paul Scott Anderson

The Kepler Space Telescope has revolutionized our understanding of exoplanets, or worlds orbiting other stars. It’s been the most successful planet-hunter by far, so far …

Read MorePlanet-hunter Kepler keeps going as fuel dwindles

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InSight mission launches to study the ‘heart’ of Mars

May 7, 2018May 7, 2018 by Paul Scott Anderson

This past weekend NASA launched its next mission to Mars, but this one will be a little different than the previous ones. Unlike the rovers …

Read MoreInSight mission launches to study the ‘heart’ of Mars

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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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