Posted on 05/11/2015 6:26:43 PM PDT by lbryce
The mysterious bright spots on the dwarf planet Ceres are better resolved in a new sequence of images taken by NASA's Dawn spacecraft on May 3 and 4, 2015. The images were taken from a distance of 8,400 miles (13,600 kilometers).
In this closest-yet view, the brightest spots within a crater in the northern hemisphere are revealed to be composed of many smaller spots. However, their exact nature remains unknown.
"Dawn scientists can now conclude that the intense brightness of these spots is due to the reflection of sunlight by highly reflective material on the surface, possibly ice," said Christopher Russell, principal investigator for the Dawn mission from the University of California, Los Angeles.
These images offer scientists new insights into crater shapes and sizes, and a host of other intriguing geological features on the surface. The image resolution is 0.8 mile (1.3 kilometers) per pixel.
(Excerpt) Read more at nasa.gov ...
Ceres rotating close up
See? There’s always a bright spot!
That’s beautiful! Well said.
Perhaps its a hole in the shell, and it’s full of stars!
HI YO, Silver!!!
Silver mining opportunity on Ceres!
Expect Ceres to vapourize shortly.
When you’re chewing on life’s gristle,
Don’t grumble, give a whistle!
https://www.youtube.com/watch?v=WoaktW-Lu38
There are some long linear deformations that seem to pass through or come close to the bright spot crater. Could just be a coincidence.
Or the white spots could be full of stars.
It’s hollow inside, aliens are living on the inner surface, they really like a lot of light, and sometimes they stomp holes in the floor.
That ice is very valuable stuff in the asteroid belt. Water is something we humans need quite a bit of.
Hydrogen and oxygen.
My thoughts too.
The Moon has bright areas all over it, and it’s not from ice, but rather glassy ejecta material, a result of melted impact rock cooling very quickly.
The moon has a lot of titanium oxide on the surface which is the same substance used in most white paint.
I was reading up on the bright areas on the Moon and they apparently could have several different origins besides glassy ejecta melt.
Yeah. there are lots of different minerals on the surface of the moon but yes the regolith is primarily pulverized glass.
From wiki...
A ray system comprises radial streaks of fine ejecta thrown out during the formation of an impact crater, looking a bit like many thin spokes coming from the hub of a wheel. The rays can extend for lengths up to several times the diameter of their originating crater, and are often accompanied by small secondary craters formed by larger chunks of ejecta. Ray systems have been identified on the Moon, Mercury, and some moons of the outer planets. Originally it was thought that they existed only on planets or moons lacking an atmosphere, but more recently they’ve been found on Mars in infrared images taken from orbit by Mars Odyssey’s thermal imager.
[IMAGE]
Gratteri crater, a rayed crater on Mars that was imaged by THEMIS at night. Image covers an area 32 km across.
Rays appear at visible, and in some cases infrared wavelengths, when ejecta are made of material with different reflectivity (i.e., albedo) or thermal properties from the surface on which they are deposited. Typically, visible rays have a higher albedo than the surrounding surface. More rarely an impact will excavate low albedo material, for example basaltic-lava deposits on the lunar maria. Thermal rays, as seen on Mars, are especially apparent at night when slopes and shadows do not influence the infrared energy emitted by the Martian surface.
The layering of rays across other surface features can be useful as an indicator of the relative age of the impact crater, because over time various processes obliterate the rays. On non-atmosphered bodies such as the Moon, space weathering from exposure to cosmic rays and micrometeorites causes a steady reduction of the differential between the ejecta’s albedo and that of the underlying material. Micrometeorites in particular produce a glassy melt in the regolith that lowers the albedo. Rays can also become covered by lava flows, or by other impact craters or ejecta.
[IMAGE]
Lunar rays
Asymmetrical ray system about the lunar crater Proclus (Apollo 15 image).
The physical nature of lunar rays has historically been a subject of speculation. Early hypotheses suggested that they were deposits of salt from evaporated water. Later they were thought to be deposits of volcanic ash or streaks of dust. After the impact origin of craters became accepted, Eugene Shoemaker suggested during the 1960s that the rays were the result of fragmented ejecta material.
Recent studies suggest that the relative brightness of a lunar ray system is not always a reliable indicator of the age of a ray system. Instead the albedo also depends on the portion of iron oxide (FeO). Low portions of FeO result in brighter materials, so such a ray system can retain its lighter appearance for longer periods. Thus the material composition needs to be factored into the albedo analysis to determine age.
Among the lunar craters on the near side with pronounced ray systems are Aristarchus, Copernicus, Kepler, Proclus, and Tycho. Similar ray systems also occur on the far side of the Moon, such as the rays radiating from the craters Giordano Bruno and Ohm.
North Ray and South Ray craters, each with a clear ray system, were observed from the ground by the astronauts of Apollo 16 in 1972.
See also
List of craters with ray systems
http://en.wikipedia.org/wiki/Ray_system
It’s the city of them there reptilians getting ready to invade Texas under cover of Jade Helm 15.
;-)
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