The HST uses EM waves to find things through echolocation or firing a beam of EM waves (or sound) at objects and seeing what a planet or star has done to change the light. Ultrasound works this way.
We depend heavily upon the electromagnetic spectrum to observe our environment, whether close or distant. Visible light is part of that spectrum, and vision is the most informative sense. Other parts of the spectrum which are not visible, such as infrared rays, microwaves, radio waves, X rays etc., can be observed by means of specialized equipment. All of these parts of the spectrum carry useful information. There are many astronomical objects which cannot be seen in the visible spectrum, or can be seen very poorly in the visible spectrum, but which can be seen very clearly in other parts of the electromagnetic spectrum.
-- use visible light to read things and learn stuff; knowledge is power.
-- use infrared radiation to stay warm;
-- use X-rays to figure out what's wrong when something hurts;
-- use radio and TV waves for entertainment;
-- use 2.5 GHz RF to cook food fast;
-- use 1.5 GHz RF to run my GPS;
-- use microwaves at 6 GHz and up to make my living;
The residual radio waves created at the time of the 'big bang' can still be detected (as background 'noise') in the radio part of the EM spectrum.
Most of the EM spectrum is visible light.
Astronomers use the EM spectrum, Physicists speculate about it, yet the practical study of it falls to the Mechanical Engineers: your answer = mechanical engineering.
infrared radiation ;)<3
The EM spectrum is a continuous uniform range/domain that has no inherent internal or external boundaries. All delimitation are artificial constructs imposed upon it by man. If you wish to talk about any EM range you agree to definite it for discussion. It does not exists as a natural phenomena.
One way to break down the electromagnetic (EM) spectrum from low frequency (long wavelength, lower energy) to high frequency (short wavelength, higher energy), is to break it up into radio waves, which include "regular" radio waves and microwaves, light, which includes infrared (IR), visible light, and ultraviolet (UV) light, X-rays, and cosmic rays. The radio waves are those we are familiar with. Radio, TV and such. Microwaves are just high frequency radio waves used in radar, communications and the ubiquitous microwave oven. We know light, too. We see it, and we know about the lower frequency light below the visible spectrum which we call infrared. IR is used in the transfer of heat and in many of our remote controls for TV's and such. Visible light is just that, and ultraviolet is the UV we put on sun block to avoid. Insects use UV to "see" things differently. X-rays are high energy EM rays that penetrate us, and we use them for medical and other types of imaging as well as investigation (spectroscopy). Cosmic rays are the highest energy EM waves generated when some nuclear reactions occur and EM energy is released from the nucleus of an atom. You need a link to the Wikipedia article, and you got it.
Most of the EM spectrum is visible light.
The waves are called "electromagnetic waves". All types of EM waves can be used to study the Universe.
all of the em spectrum is measured i waves
That part is called "visible light", or just "light".
See:What_is_a_visible_spectrum
Wavelength and frequency :)
All electromagnetic (EM) waves are in the EM spectrum. This is from "ELF" (3-30hz) through visible light (300Thz+), out past gamma rays. Any wave above DC that broadcasts into space is part of the EM spectrum.
No sure what you mean by "the reason." Electromagnetic waves exist in our Universe. Our eyes are able to detect a small fraction of the spectrum of these waves, and we call that small fraction of the spectrum, "light." In other words, the reason that light is an EM wave is because it IS.
just beyond violet in the visible light section of the em spectrum
Well there is the Electromagnetic (EM) spectrum. Visible light is the light that we can see and they are red, orange, yellow, green, blue, indigo, and violet. On the EM spectrum there is radio/ TV, microwaves, infrared, ultraviolet (UV), xrays,and gamma rays.
That's a fascinating and unique question! My first reaction is that the part of the EM spectrum you'd choose depends on the detection mechanism you plan to use. For example, if you'll observe the measurement visually, then you would use visible light, whereas if you planned to use radio detection apparatus, then you would use microwave radio waves in a RADAR configuration.
Gamma rays