I saw a falling star a wk ago, that was neon green in color, is this unusual to the white color u see most?
92109
That wasn't a "Falling Star" you dummy. That was me The Green Goblin terror of the universe....\nBWAAAAAAAAHAHAHAHA
37735
Stars are like our Sun. Not comets at all. Comets are dirty, big snowballs that have no light at all. The twinkling comes from heat radiating from earth which makes the light spectrum shift in different colours. Symbols that represent something doesn't often look like the original. Take the symbol for a heart for example. But it's easy! :) Try to draw a immensly huge boiling, burning piece of gas that throws tons of particles out from it in lightning speed and see if anyone understands what you drew. Now try to make it into a character that you can type on a keyboard :)
948153
Good.  It's always fun seeing bright meteors (meteors are the streak you see in the sky;  a meteorite is the term used for such an object that survives it's plunge into the atmosphere and strikes the ground; a meteoroid is the same object still in open space).  Quite likely what you saw was one of the Orionids, especially if it seemed to eminate from the constellation Orion.  Those particular meteors are very fast and can be very bright.  The Orionids were pretty spectacular this year...I saw 5 of them in about 10 minutes during the peak.
81872
Yes..I have seen a many number of things both day and night..A massive object perhaps the size of a football field..with a smooth surface squared on all corners it was very massive and overwhelming..too big to be in the sky!! \nI have have witnessed a silver disc object above me in mid afternoon while fishing on my boat in the middle of the lake..it shot straight up into the sky with instant speed. Speed that we dont have here.\nAn elongated diamond light at night that graduated to having the intensity of a very bright spotlight...then dimming again to oginal intensity ..and shot off up into the sky..with incredible speed again...speed we dont have here.\nOrange glowing spheres in early evening...\nbackwards "c" shaped object in the daylight...\nthe list goes on..but..Yeah..I have seen many...Each time something does happen..it is like a new concept..it seems to keep opening the mind more and more..there are lots of things happening..it is not slowing down.
321927
The color of the star as we perceive it depends on two factors: the intrinsic color of the star and the sensitivity of the human eye. The star can have all kinds of colors from dull red (the coolest stars) via yellow and green to blue (the hottest stars). However, our eye is evolved in the light of the sun and is most sensitive to yellow.\n\nThe result is that we perceive most stars as white, with a few exceptions. Some stars look red, bluish? For instance in the constellation Orion, Betelgeuse is a bright red star at the top left corner, and Rigel is the bright blue star at the bottom right corner. You may want to use binoculars to see the colors more clearly.
735570
sounds like it could have been sirius, in the constellation canis major. this is the brightest star in the northern hemisphere.
197280
I just closed my eyes to make a wish. I saw a falling star.\nBy the way, I couldn't identify it. So maybe ... .
749923
Blinking/flickering stars are due to our atmosphere. But more importantly, due to heat rising from the earth's surface.\n\nIf you were in space, the stars would be constant, since the medium is practically  a vacuum and the light rays are not refracted. However, once you enter our atmosphere, the air medium will cause the white light from the stars to be refracted into different colors.\n\nHowever, when heat rises from the earth, esp at night, the air will have varying refractive indices. Hence, the light from the stars will be refracted more at different times, causing the flickering.\n\nAnother example if this is if you are looking at a bright light in the distance, close to the horizon on a hot day. Most definitely you would see the heat rising from the earth, and the light would be slightly flickering also. In addition, if you are atop a hill at night, looking down at a city or town, its lights would also be flickering. It is the same principle here that applies to the blinking stars.\n\nI hope this helps.
173623
light green and sky blue...
53812
Yes..I have seen numerous things both day and night..A massive object perhaps the size of a football field..with a smooth surface squared on all corners it was very massive and overwhelming..\nI have have witnessed a silver disc object above me in mid afternoon while fishing on my boat in the middle of the lake..it shot straight up into the sky with instant speed. Speed that we dont have here. \nAn elongated diamond light at night that turned out to have the intensity of a very bright spotlight...then dimmed again..and shot off up into the sky..with incredible speed as I had seen before with the silver disc..\nOrange glowing spheres in early evening...\nbackwards "c" shaped object in the daylight...\nthe list goes on..but..Yeah..I have seen many...Each time something does happen..it is like a new concept..it seems to keep opening the mind more and more.
477940
Haven't you noticed that violet seems dim compared to blue? That's because only the blue cones are reporting it, but the green cones report a little when blue light hit them.
1061413
I don't know but I have seen some weird stuff in the sky. I saw this light go back and forth very fast a couple of times then disappear straight up into the sky. I also used to see these weird upside down arch shape clouds in the sky just barely moving. Bonafide Alien Space Craft or Aerial Government Experiment, I don't know.
430419
Have you ever looked at the sky and seen a shooting star?\n\nThese are meteors burning up as the enter the atmosphere.  Is this what you are talking about?
496226
STARS AND NEBULAE.\n\nMost of the things you can see in the night sky are stars: a few thousand are visible to the unaided eye. A star is a hot ball of mostly hydrogen gas; the Sun is an example of a typical, ordinary star. Gravity keeps the gas from evaporating into space, and pressure due to the star's high temperature and density keeps the ball from shrinking. In the core of the star, the temperature and densities are high enough to sustain nuclear fusion reactions, and the energy produced by these reactions works its way to the surface and radiates into space as heat and light. When the fuel for the fusion reactions is depleted, the structure of the star changes. The process of building up heavier elements from lighter ones by nuclear reactions, and adjusting the internal structure to balance gravity and pressure, is called stellar evolution. \nLooking at a star through a telescope can tell us many of its important properties. The color of a star tells us its temperature, and the temperature depends on some combination of the star's mass and evolutionary phase. Usually, observations also allow us to find the luminosity of the star, or the rate at which it radiates energy as heat and light. \nAll stars visible to the unaided eye are in our galaxy, the Milky Way. The Milky Way is system of roughly 100 billion stars, along with a great deal of interstellar material. The galaxy is shaped like a flattened disk embedded in a round, faint halo. Gravity keeps the stars from drifting away, and the motions of the stars keep the system from falling in on itself. The Milky Way has no distinct edge - the distribution of stars tapers off gradually with increasing distance from the center. The SDSS detects stars more than a million times fainter than can be seen with the unaided eye, far enough to see the outer structure of the Milky Way. \nStar Colors and Luminosities: The H-R Diagram\nAstronomers often make plots of the luminosities of stars compared to their colors. The first such charts were made in the early twentieth century, when astronomers took spectra of thousands of stars, then placed the spectra into a sequence based on the appearance of several different features. The classes of stars were given different letters as names; in order of decreasing temperature, they are OBAFGKMLT. The hottest stars are class O, while the coolest are class T. Two astronomers, Ejnar Hertzsprung and Henry Norris Russell, independently started to wonder what would happen if they compared stars' luminosities to their spectral classifications (or, alternatively, to their temperatures). They knew that some stars were hotter and more luminous than the sun, and that others were cooler and less luminous. Hertzsprung and Russell found that 90% of the stars fell into a narrow band they termed the "main sequence." Today, we call this type of plot a Hertzsprung-Russell (or H-R) diagram. \nAstronomers further divide each letter into ten categories from 0 to 9, with 0 being the hottest star in that spectral class and 9 being the coolest. So, a B1 star is hotter than a B2 star, and a B9 star is hotter than an A0 star. Our own sun is at the "hot" end of the G range with a surface temperature of 5,770° K; therefore, it's called a G2 star. \nSpectral classes give us a convenient way to refer to most types of stars - from O0, the hottest at over 25,000° K, down to T9, the coolest failed stars at 1,000° K. Each spectral type of star is associated with a specific color: all G-type stars like the sun are yellow, all M-type stars appear red, and all B-type stars are bluish. Thus, this system of letters and numbers tells us where a star is on the horizontal (color or temperature) axis of the H-R diagram. \nTwo alternative systems tell us approximately where on the vertical (luminosity) axis a star can be found. One system uses absolute magnitude, a measure of luminosity derived from the apparent magnitude, or brightness of the star
1095018
Not a simple question, but  this is two main reasons.\n\n1) Brightness of the Star Play a part.   Assume uniform Atmosphere.\n\n2) The Atmosphere also another part.  Assume stars of the same brightness.\n\n1)  Brightness of the Star Play a part.\nBrighter the Star, less likely the twinkle.   Look at the Moon, does it go Bink Bink?  Too Bright.\n\nBut Dimer stars, under the same Atmospheric conditions, may Bink.\n\n2) The Atmosphere also another part.\nThe Atmosphere is not uniform, look at the sky during the day, sometime, it clear blue,  and other time clouds mass abound.\n\nThe Atmosphere is like a thin soup, with some sliver of bread in it,.  using that example, when the Stars of the same brightness is in the Sky,  imagine when a sliver of bread blocks lightly one of the stars, thus one Bink, and another don't.\n\nIt Real life, Stars are not of the same brightness, and the Atmosphere is not always uniform.  making the issue complex.
1068651
White reflects light at *visible* wavelengths better.\n\nHowever, the designers were not trying to reflect visible light.  I would guess they designed the coating to emit thermal radiation as efficiently as possible - approaching 'black-body'.  The coating color would probably be secondary to that consideration.\n\n****\nSide Note\n*****\nDue to it's tremendous speed, the orbiter shock-heats air at it's leading surfaces during reentry. (the orbiter's underbelly is exposed directly to the 'wind stream', if you will, due to the orbiter's initial high-angle of attack)\n\nThe temperatures of the thermal protective surfaces rise primarily in response to thermal radiation from the incandescent shockwave.  NOT FROM FRICTION.
913046
upper left hand corner....icon looks ike a star