How do you explain the five-cornered shape of stars in the sky?
355984
What the heck are you talking about?
668601
I'm not sure what you mean, but I'll make a guess.  Are you talking about the constellation Taurus (the bull)?\n\nIf so, Taurus is simply a collection of stars that some folks (the ancient Greeks) thought looked like a bull.  You can make out a face and horns.  One of the stars, Aldebaran, is red in color and located about where one of the bull's eyes would be, so the bull looks angry.\n\nThe stars in Taurus (or any constellation) aren't actually connected or even close to each other.  Some are relatively close to earth, and some are very far away.  They just happen to all lie in the same direction and appear to make out a shape.\n\nWikipedia has a sky map that shows the shape of Taurus and also discusses some of the stars as well as the mythology about the bull.
1036572
Here are the five postulates (for figures see URL):\n\n\nLet the following be postulated:\n\nPostulate 1.\n    To draw a straight line from any point to any point.\n\nPostulate 2.\n    To produce a finite straight line continuously in a straight line.\n\nPostulate 3.\n    To describe a circle with any center and radius. \n\nPostulate 4.\n    That all right angles equal one another.\n\nPostulate 5.\n    That, if a straight line falling on two straight lines makes the interior angles on the same side less than two right angles, the two straight lines, if produced indefinitely, meet on that side on which are the angles less than the two right angles.
141631
Here is a site that shows the cyle of a star http://www.enchantedlearning.com/subjects/astronomy/stars/lifecycle/\n\nHope it helps you!
54171
South west sky.\n\nJust set the time and date in the map link below.\n\nJupiter looks like a curvy numeral 4 on an olive circle on this sky map!
670374
The sun is of spectral type G2.  G means "yellow" and the 2 is essentially "how yellow".  G0 would be closer to yellow-white and G9 would be closer to orange.\n\nIt is sometimes shown as "G2V"--the V is the Roman numeral 5, and represents the size.  V=5 is "dwarf" (not as in white dwarf, which is VII I think, but "dwarf" as opposed to Giant--I, II, III, and IV are various sizes of Giant).
671223
Like the number of grains of sand on the beach or angels that can dance on the head of a pin, the number of stars in the sky remains a great unknown. Discussing the number of stars in the Milky Way alone, astronomer William Keel, writing for the sci.astro Galaxies FAQ, claims that there are "about as many as the number of hamburgers sold by McDonald's." \nThen he elaborates. The usual way to determine the number of stars in the universe is to consider how many stars there are in the Milky Way, and then to multiply that number by our best guesstimate at the number of galaxies in the universe. This FAQ suggests there are probably about 400 billion stars in the Milky Way, although "a 50% error either way is quite plausible." As for the number of galaxies in the universe, well that's a whole separate mathematical puzzle. \n\nOther star enumerators we located on the Web offer numbers ranging from more than 200 billion stars in our galaxy to 3 thousand million billion stars (3 followed by 16 zeroes), in the universe. NASA alleges there are zillions of uncountable stars.
752575
The scientific name for the twinkling of stars is stellar scintillation (or astronomical scintillation). Stars twinkle when we see them from the Earth's surface because we are viewing them through thick layers of turbulent (moving) air in the Earth's atmosphere. \n\nStars (except for the Sun) appear as tiny dots in the sky; as their light travels through the many layers of the Earth's atmosphere, the light of the star is bent (refracted) many times and in random directions (light is bent when it hits a change in density - like a pocket of cold air or hot air). This random refraction results in the star winking out (it looks as though the star moves a bit, and our eye interprets this as twinkling). \n\nStars closer to the horizon appear to twinkle more than stars that are overhead - this is because the light of stars near the horizon has to travel through more air than the light of stars overhead and so is subject to more refraction. Also, planets do not usually twinkle, because they are so close to us; they appear big enough that the twinkling is not noticeable (except when the air is extremely turbulent). \n\nStars would not appear to twinkle if we viewed them from outer space (or from a planet/moon that didn't have an atmosphere). \n\n\n---------------------------------------------------------------------------------\nStars, except for the Sun, although they may be millions of miles in diameter, are very far away.  They appear as point sources even when viewed by telescopes.  The planets in our solar system, much smaller than stars, are closer and can be resolved as disks with a little bit of magnification (field binoculars, for example).\n\nSince the Earth's atmosphere is turbulent, all images viewed up through it tend to "swim."  The result of this is that sometimes a single point in object space gets mapped to two or more points in image space, and also sometimes a single point in object space does not get mapped into any point in image space.  When a star's single point in object space fails to map to at least one point in image space, the star seems to disappear temporarily.  This does not mean the star's light is lost for that moment.  It just means that it didn't get to your eye, it went somewhere else.\n\nSince planets represent several points in object space, it is highly likely that one or more points in the planet's object space get mapped to a points in image space, and the planet's image never winks out.  Each individual ray is twinkling away as badly as any star, but when all of those individual rays are viewed together, the next effect is averaged out to something considerably steadier.\n\nThe result is that stars tend to twinkle, and planets do not.  Other extended objects in space, even very far ones like nebulae, do not twinkle if they are sufficiently large that they have non-zero apparent diameter when viewed from the Earth.\n-------------------------------------------------------------\n\n\nI can be more specific, sure. Remember that just like a computer screen, your eye is composed of a certain number of "pixels," each represented by a single light-receptor cell in your retina. If two (or more) points of light are close enough such that they are focused on the same receptor cell in your eye, you will experience them as a single point of light. This is referred to as the "resolution" of your eye, or any telescope for that matter. \n\n\nNow, a star on the sky is in a true sense a single point of light. All the light comes through the atmosphere in exactly the same direction, through exactly the same atmospheric turbulence, and thus is bent in exactly the same way. So when it gets to your eye, the amount of light you see coherently varies. It also strikes (primarily) only a single receptor in your eye. \n\n\nOn the other hand, light from a planet is different. Each of a few receptors in your eye sees a large number of light rays coming f
368226
I like distinctive shapes as they are immediately recognisable. So Orion and the w-shape of Cassiopea.\n\nBit I had most fun with the Pleiades, which are a cluster near Aldebaran, the "eye" of Taurus the bull. Some of the stars in the cluster are 5th or 6th magnitude, so only visible on a clear night. Not so likely to have a sufficiently clear night in a city. So wherever I went, I used to look to see how many of the Seven Sisters I could see.
968711
A rainbow is curved due to angle requirements.  Light from the sun that\nbounces through a drop of water, comes into your eye, and appears red must\nbounce at a specific angle.  Join two sticks together at a set angle.  Place\none end at a dot to represent the sun.  Place the other toward your eye.\nThe place where the sticks join, where the water drop is, can be rotated\naround in a circle.  A rainbow is shaped like a circle.\nWell,\n\nYou never see the entire rainbow because of the horizon.  When you look at a\nrainbow, the Earth gets in the way of most of the circle.  The portion you\nsee is just the top portion.  Draw a circle and cover a little more than\nhalf of it.  What is left is the shape of a rainbow.\n\n____________________________________________________\nWhy does the light that is dispersed by the rainbow forms a bow? The answer involves the use of some simple geometry. The first point is that a rainbow is not a two-dimensional arc; it is in fact a three dimensional cone with the apex at the observer's eye. The reason that it appears to be only a two dimensional flat object isbecause there is no evidence of distance. All the drops, which disperse lighttowards the observer to form the rainbow, lie in the shape of a cone withmany different layers. The outside layers disperse the red component, thelayer below  that - the orange component, and the layer below that -the yellow component, etc. \nConsider the path of a ray of monochromatic light through a single spherical raindrop. Imagine how light is refracted as it enters the raindrop, then how it is reflected by the internal, curved, mirror-like surface of the raindrop, and finally how it is refracted as it emerges from the drop. If we then apply the results for a single raindrop to a whole collection in the sky, we can visualize the shape of the bow.\n\nAlso consider only the dispersion of the red component of the light. It has been shown previously that the red component is seen when the angle between the incident rays and dispersed rays make an angle of 42 degrees. Of course beams are dispersed at 42 degrees from drops all over the sky in all directions up, down, left, and right. However, only red light, which reached the observer eye, comes from the water drops which are on the cone with sideto axis angle of 42 degrees. If the observer's eye is at the apex of the coneas shown in Figure 3, then to see the violet part of the bow we would needto look at 40 degree to the conical axis. Therefore, the cone that producesthe violet component comes from a cone inside that of the cone which producedthe red part. The same argument can be made for all the other colors, andbecause different colors are formed by different cones, when they are viewedfrom the apex they appear in the form of a bow.\nIt is interesting to note that because only the drops on the cone with apex at the observer's eye are responsible for the formation of the rainbow, which an observers sees, then an important implication is that each person looking at a different rainbow. That leads to another interesting fact that both of the observer's eyes actually see a different rainbow, as they are both at the apex of different cones.
185636
Star pattern.\n\n.........*.........\n...................\n*.....*.....*.....*\n.....*.......*.....\n.........*.........\n...................\n*.................*
841998
Mark sections that are the same size on a map.  You can do this by drawing 1 in. by 1 in. squares.  Then, find the number of stars in one part of the sky.  On the map, estimate the stars in other parts of the sky, using the sample you had taken.  Multiply the number of stars in the sky by the sections you have number of sections you have labeled on the map.
330462
Sorry to disappoint you, but light from stars and the sun is not crooked. it is straight. Therefore, straight lines do exist in nature.
596808
type of star\nspectral type\ndistance from star to Earth
777997
I don't know, but I am now very curious as to where this question comes from. I mean, why those particular angles? And what angles are they anyway? Right ascension expressed in degrees instead of hours? Celestial latitude? And why the extreme precision, specified to within 1/10,000 of an arc second?\n\nAnyway, here is a good web site for showing the sky at any time you like. Now all you have to do is try different times until that alignment appears. What a chore!
10243
The usual five-pointedstar is formed by extending the sides of the pentagon until they meet outside the pentagon.  In this case, the base angles of the triangles have measure 72 degrees, and the vertex angle has measure 36 degrees.When you erase the original pentagon, the large interior angles are\n252 degrees, and the exterior angles are 108 degrees.
483599
the other answers are somewhat correct but unnecessarily long....\n\n1. the rainbow is actually a circle that is partially visible as an arch due     \n    horizon limitations.\n\n2.  it is a circle because the light source ( the sun ) is a circle.