Mapping those relic over-densities can be an extraordinarily effective way look into how and why the expansion is accelerating. Eventually, that soup cooled and the waves froze in place, remaining as slightly more dense regions where more galaxies tended to form as the universe expanded. These ripples first formed as sound waves soon after the big bang, when the cosmos was a hot, roiling soup of particles and radiation. The other type of map uses ripples in the matter distribution of the universe called baryon acoustic oscillations. ![]() ![]() Knowing the distribution of dark matter more precisely will help us figure out how it behaves and may present clues as to what it is really made of. The distortions are usually tiny, but the huge amount of data Euclid is expected to collect during its six-year mission should allow researchers to use gravitational lensing to map out the distribution of matter – including dark matter, which we can’t see any other way – in the universe. While it isn’t the first space telescope to use either of these types of instruments, it will be unusual in that it is planned to observe a huge swathe of space, cataloguing over a billion galaxies across more than one-third of the sky. Dark energy has the opposite effect, causing the accelerating expansion of the universe as a whole.Įuclid has two scientific instruments: a visible light camera to measure the shape of galaxies, and a near-infrared detector to measure their brightness and distance. Astronomers infer the existence of dark matter from the behaviour of the matter that we can see, which acts as if there is some extra source of gravity holding everything together. These two “dark” components make up more than 95 per cent per cent of the cosmos, but we cannot see them, hence their names, and know very little about what they could be made of. Euclid is designed to help solve two of the biggest mysteries in the universe: dark energy and dark matter. The European Space Agency (ESA) is gearing up to launch its newest space telescope, Euclid, which is scheduled to blast off from Cape Canaveral in Florida on 1 July. Hopefully this is of interest to some members.Īs mentioned,I find digital content very useful as it can be readily searched in this computer age, for items of interest, but I also enjoy collecting the ‘old fashioned‘ paper versions as well, mainly books, but that is for another thread.An artist’s impression of the Euclid space telescope It appears that the DVDs that were once on sale with many old S&Ts are not now available. The link above shows the two mentioned along with many other items, one of which, interestingly, is the BAA sky chart prepared by Wil Tirion some years ago now! Still available on the S&T website are DVDs of ‘The Sky’ and ‘The Telescope’ which were two separate publications prior to their merging in the early 1940s into S&T. This one is to an index as a spreadsheet which is quite good if not in complete detail This one goes to which are the PDFs of 1625 past copies of S&T Some posts on the other forum have been giving links that may be of interest to those of us who find digital content useful, as I do. I stopped subscribing a while ago for many of the reasons already stated. ![]() I belong to another forum which has discussed this disappointing news.
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