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In the early-middle part of the twentieth century, when astronomers began to seriously study galaxies using the newly constructed 100-in (254-m) telescope on top of Mount Wilson, they found Cepheid variable stars in some of them This resolved the question of whether or not the spiral nebulae are, in fact, island universes They are and they are farther away than anything in the Milky Way Two astronomers, Edwin Hubble and Milton Humason, made the assumption that the Cepheid variables in other galaxies exhibit the same brightness-versus-period relation as the Cepheids in our own galaxy On this basis, estimates of distances to some of the spiral galaxies were made The initial estimate of the distance to the Great Galaxy in Andromeda was 600,000 to 800,000 light-years (More recently, this figure has been revised upward to about 22 million light-years) Some of the spiral galaxies that Hubble and Humason examined appeared to be 10 million light-years distant These were the most distant galaxies in which Cepheid variables could be individually observed Yet there were galaxies much smaller (in terms of angular size) and fainter than the dimmest ones in which Cepheid variables could be resolved This, Hubble and Humason reasoned, meant that there are galaxies much farther away than 10 million light-years Beyond the limit at which the Cepheid variables can be used, astronomers use the brightnesses of galaxies as a whole to infer their distances This is not an exact science Observations over great distances are complicated by the fact that what we see is an image of the distant past and not an image of things as they are right now

Use the FRA to store archived logs and database backups If using NAS as the backup destination, use a file system on NAS instead of FRA Perform an initial full backup using image copies (RMAN level 0) Perform daily incremental backups (RMAN level 1) With a delay of 24 hours, roll the incremental backups into the full backup using the RMAN incremental merge feature The delay is to ensure the user-initiated data corruptions do not propagate into the backups Consider a hybrid backup strategy to disaster-proof your backups, and copy the backups made on disk and persist them by performing another backup to tape

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Earlier in this chapter, we discussed using Oracle Data Guard as the best practice to achieve high availability and protection from planned and unplanned failures If media failures occur on the Database Machine and you do not have a Data Guard configuration, you have no choice but to recover the database using backups

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Visible light and all EM waves, including radio, IR, UV, x-rays, and gamma rays, travel at a finite speed through space A galaxy 10 million light-years away appears to us as it was 10 million years ago, not as it is today If relative brightness is used as a distance-measuring tool, there appear to be galaxies billions of light-years away We see these as they were billions of years ago in some cases, as they were before our Solar System existed Do galaxies maintain the same average brightnesses over time spans this great We do not know If they do, then our estimates of their distances are fairly accurate If not, then our distance estimates are not accurate Based on their assumptions, Hubble and Humason found an interesting correlation between the apparent distance to a galaxy and the amount by which the lines in its spectrum are shifted In general, the farther out in intergalactic space we look, the more the spectra of individual galaxies are redshifted This suggests that all the galactic clusters in the Universe are moving away from all the others The most commonly accepted explanation for this red shift is Doppler effect caused by radial motion away from an observer Hubble and Humason made the assumption that the red shifts are caused by a general expansion of the Universe, and based on this, they found that the speed-versus-distance function is linear On average, objects 200 million light-years away appear to be receding from us at twice the speed of objects 100 million light-years away, objects 400 million light-years away are receding twice as fast as those 200 million light-years away, and so on This gives astronomers yet another tool for estimating vast distances in the Universe, but it must be based on yet another assumption: The slope of the speed-versusdistance function is constant all the way out to the limit of visibility When this assumption is made, the conclusion follows that we will never see anything farther away than about 15 billion (15 1010) light-years because such objects would be receding from us at a speed greater than the speed of light Does the average brilliance of galaxies remain the same over periods of billions of years Starting in the 1960s, there were reasons to think not.

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