Over 700 miles across, Mare Imbrium (Sea of Rains) is the largest lunar sea. Its roughly circular shape is defined by a series of mountains ranges just coming into good view tonight and the next few nights. Credit: Joseph Brimacombe

Share An Evening With The First Quarter Moon

I’m a tireless moon booster. There are just so many ways of enjoying our only natural satellite. Whether walking by its light, trying to discern a rabbit, woman or man in that shiny ball or roving across its crater-riddled regolith (lunar soil) with binoculars and telescope, the moon is multi-dimensional. Tonight it’s at half or first quarter phase,…
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Ceres Lonely Mt hi resCROP_Crop

New View Of Ceres Conical Mountain A Puzzler

What is going on with that mountain? New images taken by NASA’s Dawn spacecraft from its new, lower science orbit of just 915 miles (1,470 km) reveal fresh and puzzling details on the conical mountain that towers 4 miles (6 km) high over the dwarf planet Ceres. Its slopes show bright streaks, the top appears fractured, but…
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Pluto charon panel July 11

Pluto And Charon Surprise With Chasms, Cliffs And Craters

Verrrrry interesting. Much more is becoming clear in the hours before New Horizons’ historic flyby. In photos taken Saturday, we see what appear to be craters on both Pluto and its largest moon, Charon. Pluto also reveals several cliffs (or are they crater walls seen in profile?) along its far limb. Colossal chasms dent the crust…
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Crater-pocked Ceres Looks Back At Earth

Thought you’d like to see the latest photo of the asteroid Ceres taken by NASA’s Dawn spacecraft from a distance of 52,000 miles (83,000 km). That’s only a fifth the distance to the moon. We’re really getting clear views now of just how cratered this place is. Bright spots pop out from about the center of…
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Wanna Name A Crater On Mercury? Find Out How

NASA’s orbiting MESSENGER spacecraft has snapped more than 250,000 photos since plunking into orbit around Mercury in 2011. The solar system’s innermost planet’s ancient surface is Swiss-cheesy with craters of all sizes, all named – according to convention – after deceased artists, musicians, painters, and authors who have made outstanding contributions to their field. Hellacious…
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