Cliquez sur le bouton ci-dessous pour accéder au site de création de sites Web
Vous pouvez également avoir accès à quelques astuces de paramétrages de WordPress et d’autres plugins les plus utilisés.
Et pour les plus novices vous trouverez trois ou quatre notions essentielles pour comprendre les concepts de base avant de se lancer dans la création de son site Internet.
Image Astro du jour
Today’s Picture of the Week celebrates the intricate design of the Multi Object Optical and Near-infrared Spectrograph, or MOONS, a new instrument at ESO’s Very Large Telescope (VLT) that recently performed its first observations. Shown here, suspended in darkness, are two of MOONS’ infrared cameras. These multi-tiered shiny metal structures, covered in bolts and cables, will be used to probe the construction of our galaxy and those beyond.
The centre of the Milky Way is shrouded in dust, which blocks visible light from inner stars passing through to us. By gathering a different type of light that can pass through this dust, called infrared, MOONS can investigate the properties of millions of these ‘hidden’ stars. This will enable astronomers to produce an accurate 3D map of the centre of our galaxy. MOONS will also be used to study millions of other galaxies, probing how they form and evolve at different ages of the Universe.
How does MOONS’ design enable detailed observations of so many cosmic objects? By using around 1000 fibre-optic cables, each mounted on a robotic positioner that carefully points it to the exact location of an astronomical object, whose light is then fed from the VLT into two spectrographs. Spectrographs work like a prism creating a rainbow, splitting the light they receive into separate ‘colours’ (or wavelengths) to then be detected by cameras, like the ones in this image. The fingerprints of chemical elements encoded in the light can then be analysed in detail, revealing properties of cosmic objects like composition, mass, and velocity. To minimise contamination from sources of infrared light around the instrument, MOONS is kept very cold (between –143 and –233 degrees Celsius) thanks to a cryostat.
MOONS was developed by an international consortium led by the Science and Technology Facilities Council's UK Astronomy Technology Centre. Reflecting on his image of the unique and powerful new instrument, photographer and ESO astronomer Luca Sbordone says: “I find that these objects are beautiful, it’s a beauty that comes from the cleverness, precision, dedication and accumulated knowledge needed to make them”.
Links
ESO announcement and UK ATC press release on the MOONS first light
More details on MOONS on the ESO blog