light is emitted by objects that are very high are what?
817728
Light is emitted by objects that are very hot.\nLight is emitted by objects that are at very high temperatures.
420399
Light Amplified Stimulated Emission Radiation
684422
I know EM can go up to 100,000x (maybe beyond?), and light can go up to 1000x.  I'm not sure what the limit on EM is, but i think it's less than 800,000x.  So #4 looks right.
428000
It could be a planet or a satellite or some other celestial body. Venus is particularly bright.
399965
Its very high.Go ahead
1170187
The absorbed photon may be re-emitted as either reflected or refracted light. If it is absorbed, its energy is converted into heat. In some materials, a high-energy photon will stimulate the emission of a lower-energy photon. This is called fluorescence.
759217
Burn it in a sprectrophotometer.  Look at the emitted light.
385085
Although sightings of these colorful events have been documented in the past, this phenomena has come to the front of geophysical interest in recent times. Red sprites typically extend above the cloud tops up to heights of nearly 95 km. After several imaging campaigns in the central United States during1993 and 1994, there has been an increased demand to explain these naturally-occurring colorful flashes. The VLF group is actively pursuing scientific explanations along with our colleagues in the field. \n\nmore info in\nhttp://www-star.stanford.edu/~vlf/Red_Sprite/
839956
It emits two lines \nD1 at 589.592 nm\nD2 at 588.995 nm\n\nboth in yellow region of visible spectra
102101
If you want to look at it on the atomic level,\nyou can think of light as a photon (a packet of energy).\nThe photons can be absorbed by the electrons around the atom which will excite them into a higher energy state.  When the electron falls back down to the ground state, it gives off a photon with a specific amount of energy.\n\nhttp://www.amazingrust.com/New/beta/Experiments/background_knowledge/Spectroscopy.html
514605
As heat increases, great amounts of energy are released in photons- Thus, the photons have greater energy at higher heats..makes sense, right?  So, higher energy photons are those with shorter wavelengths, like for example, the color red has a longer wavelength than the color blue-and blue is a higher energy photon.  You can actually measure the temperature of materials by measuring the light emitted from them, if you know the material.
39807
Lets start by asking another question...What allows us to see things? Light. When we see an object we are actually seeing light reflected off of it. \nIt is reflected off because the particles that make up solid objects are very dense. \n\nHowever, air is made up of gases which are defined as: \nGas:\nThe state of matter distinguished from the solid and liquid states by relatively low density and viscosity, relatively great expansion and contraction with changes in pressure and temperature, the ability to diffuse readily, and the spontaneous tendency to become distributed uniformly throughout any container. \n\nDue to the extreme low density of gas light passes through it easy which makes it... invisible.
1088371
As far as I know, all of them.  Emission spectra are caused by electrons absorbing energy and moving to a higher energy orbit or state (in the case of visible light it is a higher orbit) then when the electron goes back down to the lower state that it usually inhabits, it gives off a photon of an energy equal to the change in the energy level of the electron.  All elements can have excited electrons, and all electrons give off photons when they return to ground state, so all electrons give off emission spectra.\nIf you know of some element out there that doesn't I would be really interested to know what's going on with it.
228088
light pollution? what the hell?
78735
Light, form of electromagnetic radiation similar to radiant heat, radio waves, and X rays. Light consists of extremely fast oscillations of an electromagnetic field in a particular range of frequencies that can be detected by the human eye. Different colour sensations are produced by light vibrating at different frequencies, ranging from about 4 × 1014 vibrations per second for red light to about 7.5 × 1014 vibrations per second for violet light. The visible spectrum of light is usually defined by its wavelength, ranging from the smallest visible wavelength for violet, about 40 millionths of a centimetre (16 millionths of an inch), to 75 millionths of a centimetre (about 30 millionths of an inch) for red. Higher frequencies, corresponding to shorter wavelengths, comprise ultraviolet radiation, and still higher frequencies are associated with X-rays. Lower frequencies, which are at longer wavelengths, are called infrared radiation, and still lower frequencies are characteristic of radio waves. Most light comes from electrons that vibrate at these high frequencies when heated to a high temperature. The higher the temperature, the greater the frequency of vibration and the bluer the light produced.\nLight is emitted from a source in straight lines and spreads out over a larger and larger area as it travels; the light per unit area diminishes as the square of the distance. When light strikes an object, it is either absorbed or reflected; light reflected from a rough surface is scattered in all directions. Some frequencies are reflected more strongly than others, and this gives objects their characteristic colour. White surfaces scatter light of all wavelengths equally, and black surfaces absorb nearly all light. Image-forming reflection, on the other hand, requires a highly polished surface such as that of a mirror.\n\nDefining the nature of light has always been a fundamental problem in physics. The English mathematician and physicist Sir Isaac Newton described light as an emission of particles, and the Dutch astronomer, mathematician, and physicist Christiaan Huygens developed the theory that light travels by a wave motion.\n\nIt is now believed that these two theories are essentially complementary, and the development of quantum theory has led to the recognition that in some experiments light acts like a series of particles and in other experiments it acts like a wave. In those situations in which it travels in wave motion, the wave vibrates at right angles to the direction of travel; therefore light can be polarized in two mutually perpendicular planes (see Optics).\n\nIII  VELOCITY \n\nThe speed of light was first measured in a laboratory experiment by the French physicist Armand Hippolyte Louis Fizeau, although earlier astronomical observations had yielded approximately the right velocity. By the 1970s the speed of light had been measured very precisely as 299,792,458 m/sec (186,282.397 mi/sec) in a vacuum, and could be used to measure large distances by the time it took for a pulse of light or radio waves to reach a target and return. This is the principle of radar and sonar. Accurate knowledge of the speed and the wavelength of light also permits accurate measurement of length. In fact, in 1983 the metre was redefined as the length of the path travelled by light in a vacuum during a time interval of 1/299,792,458 of a second. The velocity of light in air varies slightly with wavelength, averaging about 3 per cent less than in vacuum; the speed in water is about 25 per cent less, and in glass, 33 per cent less.\n\nLight has an important effect on many chemicals. Sunlight, for example, is used by plants to carry out photosynthesis, and the exposure of certain silver-containing chemicals to light causes them to turn dark in the presence of other chemicals, as is the case in photography.
32787
Violet is the highest energy visible light.  Above that is ultraviolet, X-rays, and gamma rays.
1152305
superluminal light is light that is so huge and bright that it hurts to look at it. Like at night when someone take a picture and the flash is too close to your eye you say "wow! that was superluminal!"