Example sentences of "visible [prep] the naked eye " in BNC.
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| 1 | Quite often , olivine and pyroxene begin to crystallize out early on , so they may be present in the final rock as quite large crystals , up to a centimetre across , many times larger than the crystals surrounding them , and easily visible with the naked eye . |
| 2 | I well remember the occasion when he discovered a brightish nova , just about visible with the naked eye and easily seen with binoculars . |
| 3 | The faintest stars normally visible with the naked eye are of magnitude 6 , and binoculars will go down to at least 8 ; my 20 × 70 pair will reach 9 . |
| 4 | More than a hundred are known , though only three ( Omega Centauri and 47 Tucanæ in the southern sky , and the Hercules globular in the northern ) are clearly visible with the naked eye . |
| 5 | However , there are two exceptions : the Magellanic Clouds , so named because they were recorded by the Portuguese explorer Magellan in his voyage round the world — though they must have been noticed earlier , because they are very bright — and the Large Cloud is visible with the naked eye even in moonlight . |
| 6 | It is clearly visible with the naked eye , close to Nu ( 4.5 ) . |
| 7 | Præsepe , nicknamed the Beehive , is one of the finest clusters of its type ; it is easily visible with the naked eye and is well seen with × 7 binoculars , while with × 12 and × 20 it is truly glorious . |
| 8 | M67 is in the field with Alpha ( 4.2 ) ; it is said to be visible with the naked eye , but I have never been able to confirm this , though with binoculars it is very easy indeed . |
| 9 | There is however one splendid open cluster , M41 , which is easily visible with the naked eye and is resolvable with × 20 binoculars ; various individual stars can be seen with lower magnifications . |
| 10 | The Eta Carinæ nebula is visible with the naked eye . |
| 11 | It is easy to find , because it is usually visible with the naked eye at about magnitude 5 , and is in the same binocular field with Beta ; to either side of it are Tau ( 5.1 ) and Sigma ( 4.9 ) , which act as good comparisons , though Tau is of type K and has been suspected of slight variability . |
| 12 | It is easily visible with the naked eye , and is striking in binoculars ; with × 12 there is some resolution of its outer parts , and with × 20 it is seen to be starry . |
| 13 | R Coronæ , in the bowl , is generally well within binocular range , and can just become visible with the naked eye , but when it drops to minimum it may fall to as low as magnitude 15 . |
| 14 | When photographed with adequate equipment it really does recall the outline of the North American continent ; it is dimly visible with the naked eye in the guise of a slightly brighter section of the Milky Way , and binoculars show it clearly as a large region of diffuse nebulosity . |
| 15 | With × 7 , Zeta is in the same field as Delta and Lambda , and this makes comparisons easier even though Zeta is always visible with the naked eye under even reasonable conditions of seeing . |
| 16 | It is visible with the naked eye , and its position close to Eta and Mu makes it very easy to locate . |
| 17 | It is worth remembering that in conditions of mist or moonlight , the whole south-polar region appears blank , and Beta Hydri is often the only star fairly close to the pole to remain visible with the naked eye . |
| 18 | It is the least luminous star visible with the naked eye . |
| 19 | L2 Puppis is a semi-regular variable with a range of from 3.4 to 6.2 , so that it is almost always visible with the naked eye and is well within binocular range even at minimum ; it is of type M , and clearly orange . |
| 20 | M6 and M7 are bright open clusters ; both are visible with the naked eye , not far from the Scorpion 's sting , and both are easily resolved with binoculars . |
| 21 | It is visible with the naked eye , and with × 12 I have suspected individual stars ; with × 20 there is undoubtedly some degree of resolution . |
| 22 | It has a period of 357 days , and at minimum is so faint that large telescopes are needed to show it , but at maximum it has been known to rise to 5.7 , and is then just visible with the naked eye and very easy in binoculars . |
| 23 | Its companion , Alcor or 80 Ursæ Majoris , is of magnitude 4.0 , and is easily visible with the naked eye ; the angular distance between the two is 11.8 minutes of arc , so that in binoculars they make a noble pair . |
| 24 | It is easily visible with the naked eye , and binoculars give it a vaguely cruciform appearance . |
| 25 | The mite is just visible to the naked eye and feeds on honey bees and their grubs by sucking their body fluids . |
| 26 | But many kinds of bacteria in nature form elaborate colonies , often quite visible to the naked eye , in which different individuals perform different functions , so that the whole colony functions as if it were a single organism . |
| 27 | Because the creatures of the plankton individually are small , they are not always visible to the naked eye . |
| 28 | Because they are so faint , not a single one is visible to the naked eye . |
| 29 | Protozoa are much larger than bacteria or viruses , although still not visible to the naked eye . |
| 30 | However , some cells , like the large eggs of frogs , are easily visible , and the human egg is just visible to the naked eye . |