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This photo, suggestive of an old-fashioned lift cage, in fact shows inside a much smaller enclosure: one of the electrode housing boxes that will fly on ESA’s LISA Pathfinder mission, planned for launch later this year. The inside of the box measures 5.5 cm on each side.
LISA Pathfinder is a technology demonstrator that will pave the way for future space-based observatories measuring gravitational waves – ripples in the fabric of space-time that are predicted by Albert Einstein’s general theory of relativity. Produced by massive accelerating bodies, these perturbations are expected to be abundant across the Universe, but they are yet to be detected directly.
Although not aiming at detecting gravitational waves, LISA Pathfinder will test the technologies that could be used for this daunting endeavour. In particular, the mission’s goal is to achieve the best free-fall ever, reducing all the non-gravitational forces acting on two test masses and controlling any residual effect with unprecedented accuracy.
LISA Pathfinder's test masses are two identical cubes of solid gold–platinum alloy, measuring 4.6 cm on a side and almost 2 kg each. Once in space, they will have no mechanical contact with their immediate environment. Each cube is surrounded by an ‘electrode housing’, its walls lying several millimetres from the cube on all six sides.
The boxes will track the positions of the test masses and apply tiny adjustments if needed. The housings are part of highly sophisticated equipment that includes a laser metrology system and several microthrusters to apply small shifts to the spacecraft’s position to keep it centred on the masses.
In fact, achieving a near-perfect gravitational free fall is very complex even in space, as forces other than gravity will disturb the motion of the cubes, including pressure from sunlight and particles from the solar wind.
The data collected by LISA Pathfinder will reveal all the spurious effects that can affect the purely gravitational motion of two test masses in space. In a full-scale gravitational wave observatory, the test masses would be contained in individual spacecraft separated by a million kilometres. Knowledge of all the non-gravitational forces acting on them will be needed to calibrate and optimise such a future experiment, enabling the detection of possible variations in the position of the test masses caused by a passing gravitational wave.
Credit: CGS SpA
As I sat waiting for the mountain bluebirds to return to their nesting box my shutter finger got itchy to take some pics... so I decided to play with an HDR shot...
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Missing boxes:
Pentax FA 50mm F1.4
Alien B400 (shipped in boring brown boxes)
Nikon SB-28 (Never got one)
Strobist Info:
Pentax AF-540-FGZ flash fired camera right at 1/4 at 28mm
Nikon SB-28 fired at 1/2 camera left at 1/2 at 24mm
A defunct ex British red telephone box in the centre of Alta Gracia, Cordoba, Argentina
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Daily Dog Challenge: Begins with 'W'
They say the eye is the Window of the soul. Here it's a reflection of a Woman with a camera :)
Often see a variety of species using the many Swallow boxes at Willband Creek Park for a perching spot. Here a Red-winged Blackbird is perched. Willband Creek Park, Abbotsford, B.C.
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The Florida box turtle has a narrow and highly domed shell. Its carapace has a distinct pattern of yellow stripes that make it easily identifiable. This turtle has sharp claws as well as a sharp beak used for catching small insects and eating fruits, vegetables, and fungi.
The Common Box Turtle isn't as common today as it once was. This species is terrestrial. Habitat loss and fragmentation has resulted in it being considered a species of concern in Ohio. Many have been killed by vehicles while crossing roadways. Decades ago I might see two dozen of these turtles in a single day. Now I'm lucky if I see one every year or two.
Just down the road from my house, one can find this unusual pillar box. Indeed this example explains why it is that pillar boxes are called pillar boxes, because this one clearly thinks that it really is a pillar, with its fluted, gently sloping sides. Other features, unique in my limited experience of these objects, are the vertical rather than horizontal letter slot, and the door for emptying it sited on the opposite side from he slot. In fact the door opens into the road, which must make the postman's job an adrenaline-filled one.
It's time for another round of "What's in the box?"
This is a special delivery for my main man Ricky J
If you haven't visited his store, well, it's awesome, he has all your lego needs covered, and some delicious new greeting cards too. And yes, the model is for him too, I assume it'll be on display in the shop too, just one more reason to visit. So go visit him, and buy all the awesome greeting cards :D
Manchmal sieht man die alltäglichen Dinge in einem ganz anderen Licht: Die hier leere blaue Box wird normalerweise zur Aufbewahrung des Hunde-Spielzeugs genutzt, dieses Spielzeug ist aktuell in der ganzen Wohnung verteilt. Nur der blaue Vollgummi-Ball blieb in der Box zurück. Im morgendlichen Licht leuchtet die leere Box ganz anders als sonst.
Sometimes you see the everyday things in a completely different light: The here empty blue box is usually used to store the dog toys, these toys are currently distributed throughout the apartment. Only the blue solid gum ball remained in the box. In the morning light, the empty box lights up very differently than usual.
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For personal display only !
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This box is decorated with a tessellation molecule representing the letter Z. Though it may not be obvious from its looks, this design is closely related to the Woven Triangles family. It uses an 8×8 grid for the molecule (12×12 for the whole box). Folding it from the grid
is relatively challenging due to a closed sink used for creating the diagonal stroke. Folding cleanly from a precrease without the grid comes with its own challenges, as usual. On the back of the molecule, an interesting pattern of two triangles emerges.
Full description at origami.kosmulski.org/models/z-box
Hit 'L' to view on large.
This was a permission visit after sunrise.
A revisit to a local scrapyard that had loads of barn finds and salvage vehicles. Due to the council and environmental changes, a lot of the stuff had to be removed but there were some bits n pieces left in the buildings.
"Looking close on Friday" "BOX".. 1964 Mini Cooper S. If only it was full size and in just as good condition, you would probably then be looking at £50,000 worth of Classic British Motorcar.
These two vintage cameras have recently joined my rapidly expanding collection. The one on the left (a Kodak Six-20 'Brownie' E) was made between 1947 and 1953. The one on the right (an Ensign ‘All-distance Twenty’) was made between 1922 and 1932. It's incredible to think it might be nearly 100 years old and yet it's survived in near mint condition. I'm not sure it was ever used.