April 1, 2012
Quick Mercury Stats Mass: 0.3302 x 1024 kg Volume: 6.083 x 1010 km3 Average radius: 2439.7 km Average diameter: 4879.4 km Density: 5.427 g/cm3 Escape velocity: 4.3 km/s Surface gravity: 3.7 m/s2 Visual magnitude: -0.42 Natural satellites: 0 Rings? – No Semimajor axis: 57,910,000 km Orbit period: 87.969 days Perihelion: 46,000,000 km Aphelion: 69,820,000 km [...]
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March 19, 2012
MESSENGER captured this high-resolution image of an elongated pit crater within the floor of the 355-km (220-mile) -wide crater Tolstoj on Mercury on Jan. 11, 2012. The low angle of sun illumination puts the interior of the pit crater into deep shadow, making it appear bottomless.
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