The James Webb Space Telescope About Webb's Orbit The James Webb Space Telescope will observe primarily the infrared light from faint and very distant objects. But all objects, including telescopes, also emit infrared light. To avoid swamping the very faint astronomical signals with radiation from the telescope, the telescope and its instruments must be very cold. Therefore, Webb has a large shield that blocks the light from the Sun, Earth, and Moon, which otherwise would heat up the telescope, and interfere with the observations. The L2 orbit is an elliptical orbit about the semi-stable second Lagrange point . In three of the solutions found by Lagrange, the bodies are in line (L1, L2, and L3); in the other two, the bodies are at the points of equilateral triangles (L4 and L5). In the case of Webb, the 3 bodies involved are the Sun, the Earth and the Webb. Other infrared missions have selected an L2 orbit, like WMAP and H2L2. Here are a few graphics that illustrate how far away Webb will be.
Facebook Découverte de trois exoplanètes potentiellement habitables Des astronomes de l'Observatoire européen austral (ESO) ont découvert dans la constellation du Scorpion un système solaire "doté d'une zone habitable bien remplie", avec trois "super-Terres" où les conditions seraient compatibles avec l'existence d'eau liquide. C'est autour de l'étoile Gliese 667C, d'une masse équivalente à un tiers de celle de notre Soleil, que l'équipe a fait cette trouvaille, à l'aide de l'instrument HARPS équipant le télescope de 3,6 mètres de l'ESO au Chili, indique l'organisation dans un communiqué. Le système de trois étoiles auquel appartient Gliese 667C est abondamment étudié par les scientifiques. Non seulement il est dans le voisinage immédiat de notre système solaire (22 années-lumière) mais il est aussi étonnamment similaire. Il représente donc un candidat de choix pour la recherche d'exoplanètes potentiellement habitables. Au total, les astronomes ont donc identifié au moins cinq planètes, deux autres demandant encore à être confirmées.
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Hubble Goes to the eXtreme to Assemble Farthest-Ever View of the Universe Hubble Goes to the eXtreme to Assemble Farthest-Ever View of the Universe Like photographers assembling a portfolio of best shots, astronomers have assembled a new, improved portrait of mankind's deepest-ever view of the universe. (Credit: NASA; ESA; G. Illingworth, D. Magee, and P. Called the eXtreme Deep Field, or XDF, the photo was assembled by combining 10 years of NASA Hubble Space Telescope photographs taken of a patch of sky at the center of the original Hubble Ultra Deep Field. The Hubble Ultra Deep Field is an image of a small area of space in the constellation Fornax, created using Hubble Space Telescope data from 2003 and 2004. The new full-color XDF image is even more sensitive, and contains about 5,500 galaxies even within its smaller field of view. Magnificent spiral galaxies similar in shape to our Milky Way and the neighboring Andromeda galaxy appear in this image, as do the large, fuzzy red galaxies where the formation of new stars has ceased. Related Link
The Earth's most powerful telescope goes online next week The Moon is a particularly good place to do neutrino physics because of the the cosmic ray backgrounds underground. On Earth, at sea level, cosmic rays are mostly due to high-energy protons interacting with the upper atmosphere. These collisions create a lot of pions. Because the atmosphere isn't very dense, these pions don't slow down very quickly, and so when they decay into muons the muons are still extremely energetic. Muons are highly penetrating particles, so even when we build neutrino detectors kilometres underground we have to deal with a very significant cosmic-ray muon background signal. On the Moon, with no atmosphere to speak of, the primary cosmic-ray protons smack into solid rock, so the pions are created in that very dense medium and almost all of them slow way down before decaying, so the muons only have the muons are much lower energy and penetrate a very short distance.
Galaxy Zoo bulletins-electroniques.com : toute l'actualité technologique internationale en français, en accès libre et gratuit ! Observatory Astronomical observatories[edit] Ground-based observatories[edit] Ground-based observatories, located on the surface of Earth, are used to make observations in the radio and visible light portions of the electromagnetic spectrum. Most optical telescopes are housed within a dome or similar structure, to protect the delicate instruments from the elements. For optical telescopes, most ground-based observatories are located far from major centers of population, to avoid the effects of light pollution. Specific research study performed in 2009 shows that the best possible location for ground-based observatory on Earth is Ridge A – a place in the central part of Eastern Antarctica.[3] This location provides the least atmospheric disturbances and best visibility. Radio observatories[edit] Beginning in 1930s, radio telescopes have been built for use in the field of radio astronomy to observe the Universe in the radio portion of the electromagnetic spectrum. Highest astronomical observatories[edit]