Stars mirror

In the layer-oriented approach each wavefront sensor sees all the guide stars but each is coupled to a single deformable mirror. Each wavefront sensor... 

Mt. Wilson Observatory. The UnISIS excimer laser system is deployed on the 2.5 m telescope at Mt. Wilson Observatory (Thompson and Castle, 1992). A schematic of the system layout is shown in Fig. 11. The30W, 351 nm excimer laser is located in the coude room. The laser has a 20 ns pulse length, with a repetition rate of 167 or 333 Hz. The laser light is projected from the 2.5 m mirror and focused at 18 km. A fast gating scheme isolates the focused waist. A NGS is needed to guide a tip-tilt mirror. Even with relatively poor seeing, UnISIS has been able to correct a star to the diffraction limit. 

The starfish provides a more complex example of symmetry in a living organism. If we approximate a starfish by a regular five-pointed star, we can recognize that there are five lines or planes through the organism that divide it into mirror images ... 

Newton-XMM is an X-ray telescope eqnipped with a set of nested mirrors designed to focns grazing-incidence X rays, a confignration which explains the name X-ray Mnlti-Mirror. It is an ESA project and was lannched by Ariane 5 in December 1999. It opens a window onto the nltrahigh temperatnre Universe with its explosions and stars ripped apart by black holes. Its spectroscopic targets are snpernova remnants and the gases that fill clnsters of galaxies. 

Manganese is an odd element that is underrepresented in halo stars. However, the above explanation does not seem to apply since scandium (Z = 21) and vanadium (Z = 23) do not follow the same trend, no more than does cobalt (Z = 27). It is tempting to deduce from the unusual behaviour of manganese that it is produced by SNIa events and that we are observing a mirror-image phenomenon to the one described for a elements. 

Much larger planar periodic structures have been obtained by symmetrised interactions of DX-type sticky DNA stars. Figure 16a, d shows three-arm [72] and four-arm [73] DNA stars constructed by paired double helices both with N = 22 long arms and N = 4 long sticky terminals. These structures are symmetric for, respectively, threefold and fourfold rotations but they are not mirror-symmetric. The lack of mirror symmetry favors deviations of the constructs from perfect flatness the center of the star may not be in the same plane as the arm tips. For this reason, in both cases the DNA constructs have been designed so that their arms stick end-to-end in such a way that each star interacts only with stars turned upside... 

Chirality (handedness, from Greek cheir = hand) is the term used for objects, including molecules, which are not superposable with their mirror images. Molecules which display chirality, such as (S)-(+)-lactic acid (/, Fig. 1) are called chiral. Chirality is often associated with a chiral center (formerly called an asymmetric atom ), such as the starred carbon atom in lactic acid (Fig. 1) but there are other elements that give rise to chirality the chiral axis as in allenes (see below) or the chiral plane, as in certain substituted paracyclophanes.1,2)... 

IC Wales. 2005. Chemicals found in stars blood. IC Wales, IC Network, Trinity Mirror pic. May 16, 2005 [online]. Available http //icwales.icnetwork.co.uk/0100news/0600uk/ tm objectid=15520784 cmethod=full siteid=50082 cheadline=chemicals-found-in-stars—blood-name page.html [accessed Nov. 16, 2005]. 

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