“That’s one small step for [a] man, one giant leap for mankind.” After speaking these historic words at 10:56 EDT on July 20, 1969, marking the moment that humanity first placed a foot on a world other than its own, Apollo 11 commander Neil Armstrong began his work documenting the lunar surface before him. The…
Thin Grey Line
Saturn’s expansive rings cast but a thin line of a shadow across its equator in this beautiful high-angle view taken by Cassini on July 18, 2009. The rings, normally overexposed in images to make them more visible, are instead underexposed here so some of the details of Saturn’s atmosphere can be seen. Intricate banding of…
Eagle’s Eye View
In the center of this image from the Lunar Reconnaissance Orbiter, there’s a small object casting a shadow toward the right. That object is the remaining section of the Apollo 11 lunar module, Eagle, from which astronauts Neil Armstrong and Edwin “Buzz” Aldrin made history as the first humans to step foot on the moon…
Shifting Sands
Serpentine dunes etch the polar sands of Mars in this image from the HiRISE camera aboard the Mars Reconnaissance Orbiter. See the original release here. The MRO was 194 miles above the surface when it took this photo. Image: NASA/JPL/University of Arizona
The Oceans of Venus?
It’s hard to imagine, with its pressure-cooked 800º baked-rock surface, but Venus may have once had oceans, suggests data from the European Space Agency’s Venus Express orbiter. Extensive infrared mapping of Venus’ southern hemisphere shows large areas of rock that appears to be granite. Granite, as we know it on Earth, is formed when basalt…
Three Little Moons
A little family portrait from the house of Saturn. Enceladus, Tethys and Dione. Okay, they weren’t really all lined up like that….I combined three raw shots from Cassini, taken over the weekend, and lined them up nicely. Approximate sizes in relation to each other. Just for fun. Great images though! Tethys’ huge 250-mile-wide Odysseus crater…
Sunday Best
Another fantastic image of one of my favorite subjects from the Cassini mission: the little shepherd moon Daphnis and its icy wake within the Keeler gap. This is an adjusted version of a raw image taken Saturday, July 11, and received at the imaging center in Boulder, CO later the same day. See the original…
Subtle Shades
The intricate structure of Saturn’s rings is seen here in this raw image from Cassini, taken yesterday. This (I believe) shows the dark material of the Cassini Division (bottom) below the brighter bands of the A ring (middle to top). I could be mistaken though, and this is instead the inner section of the B…
A MONDo Idea
Interesting article from New Scientist:Â A Phantom Menace to Dark Matter Theory by Marcus Chown. In a nutshell, there’s a new theory that tries to explain why stars aren’t chucked out of the galaxy when they are near the edges, like a little kid on the playground merry-go-round. (Hey, it happens.) Newtonian physics say that this…
Rhea View
A fascinating bit of work by Gordan Ugarkovic, this is a brief false-color animation of 950-mile-wide Rhea, second-largest moon of Saturn. Rhea is very reflective, indicating that it is made up of a lot of water ice, and is also heavily cratered (clearly evident here.) Water ice behaves like rock at the low temperatures that…
What a Relief
This is a video “flyover” of the images taken by the Lunar Reconnaissance Orbiter, riding along the moon’s terminator between night and day. The shallow angle of sunlight makes for very nice relief of the lunar surface. More on the LRO Mission here. Image/animation: NASA/Goddard Space Flight Center/Arizona State University
Lunar Landscape
The Lunar Reconnaissance Orbiter has opened its eyes and sent back its first images since establishing orbit around the moon on June 23. The image above is from a region called Mare Nubium – “Sea of Clouds” – and is on the Earth-facing side of the moon. “Because of the deep shadowing, subtle topography is…
Lights in the Dark 