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blue shift  in astronomy, the systematic displacement of individual lines in the spectrum of a celestial object toward the blue, or shorter wavelength, end of the visible spectrum. The displacement of spectral lines toward longer wavelengths (the red end of the spectrum) in radiation from distant galaxies and celestial objects. This is interpreted as a Doppler shift that is proportional to the velocity of recession and thus to distance is the redshift.

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The sun is a main sequence star.The sun emitts UV rays, infrared rays, and visible light. By the time they get to the surface, their frequencies are mostly only within the IR/visible light/UV spectrum. During solar flares, the Sun also emits X-rays. ... When electromagnetic radiation from the Sun strikes the Earth' s atmosphere, some of it is absorbed while the rest proceed to the Earth's surface.Light, some infrared, some ultraviolet, and microwaves, pass through the atmosphere and reaches the Earth's surface. Gamma rays, X-rays, most of the ultraviolet and some of the infrared are absorbed by the atmosphere and do not reach the Earth's surface.This skin damage can also cause wrinkles to occur. In some cases the DNA damage causes genetic mutations, which can lead to skin cells growing unusually quickly. When this happens, it can lead to skin cancer; high amounts of UV exposure is a leading risk factor for the development of skin cancer.

Infrared radiation has a longer wavelength and lower frequency than visible light. Too much exposure can damage your eyes and skin. On a global scale, trapped infrared radiation contributes to global warming.Effects of Visible Light on the Skin. Electromagnetic radiation has vast and diverse effects on human skin. The earth's atmosphere blocks a lot of the harmful rays that come to earth. Staying inside and using sunscreen are good ways to protect ourselves from harmful rays. The sun is a special star because it is smaller, gives us life, and is closer compared to other stars.

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A gamma ray or gamma radiation, is a penetrating electromagnetic radiation arising from the radioactive decay of atomic nuclei. It consists of the shortest wavelength electromagnetic waves and so imparts the highest photon energy.Gamma rays are the highest energy EM radiation and typically have energies greater than 100 keV, frequencies greater than 10 ¹⁹ Hz, and wavelengths less than 10 picometers.Gamma rays are usedto kill cancer cells, to sterilise medical equipment and in radioactive tracers. Gamma-raysare the most energetic form of electromagnetic radiation, with over 10,000 times more energy than visible light photons. ... Yourgamma-ray vision would peer into the hearts of solar flares, supernovae, neutron stars, black holes, and active galaxies.

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X-rays are a form of electromagnetic radiation, similar to visible light. Unlike light, however, x-rays have higher energy and can pass through most objects, including the body.Medical x-rays are used to generate images of tissues and structures inside the body.

X-rays are electromagnetic waves with wavelengths in the range of 0.01 to 10 nanometers, corresponding to frequencies in the range 30 petahertz to 30 exahertz

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X-ray astronomy is an observational branch ofastronomy which deals with the study of X-ray observation and detection from astronomical objects.

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Ultraviolet is electromagnetic radiation with a wavelength from 10 nm to 400 nm, shorter than that of visible light but longer than X-rays. UV radiation is present in sunlight constituting about 10% of the total light output of the Sun.Hospitals use UV lamps to sterilise surgical equipment and the air in operating theatres. Food and drug companies also use UV lamps to sterilise their products. Suitable doses of Ultraviolet rays cause the body to produce vitamin D, and this is used by doctors to treat vitamin D deficiency and some skin disorders.UV rays can be very harmful to life because they are strong enough to ionize atoms and destroy cells. Fortunately, the Earth's atmosphere shields us from most UV radiation. Astronomers who want to study UV light from celestial sources must do so from space-borne telescopes, such as the Hubble Space Telescope.

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The visible spectrum is the portion of the electromagnetic spectrum that is visible to the human eye.

Violet | 380–450 nm | 668–789 THz | 2.75–3.26 eV Red | 620–750 nm | 400–484 THz | 1.65–2.00 eVVisible light astronomy includes a variety of observations with optical telescopes that work with visible spectrums of light. Visible light is part of the electromagneticspectrum of light emitted from frequencies of electromagnetic radiation. Light has properties such as photo energy, wavelength and frequency.

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. Infrared (IR) light is the part of the EM spectrum that people encounter most in everyday life, although much of it goes unnoticed. It is invisible to human eyes, but people can feel it as heat.This range of wavelengths corresponds to a frequency range of approximately430 THz down to 300 GHz. Infrared waves have longer wavelengths than visible light and can pass through dense regions of gas and dust in space with less scattering and absorption. Thus, infrared energy can also reveal objects in the universe that cannot be seen in visible light using optical telescopes.

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Microwaves cause water and fat molecules to vibrate, which makes the substances hot. So we can use microwaves to cook many types of food. ... Microwaves are also used by fixed traffic speed cameras, and for radar, which is used by aircraft, ships and weather forcasters. Microwaves are electromagnetic waves with wavelengths longer than those of terahertz (THz) wavelengths, but relatively short for radio waves. Microwaves have wavelengths approximately in the range of 30 cm (frequency = 1 GHz) to 1 mm (300 GHz).Microwaves that penetrate haze, light rain and snow, clouds, and smoke are beneficial for satellite communication and studying the Earth from space.

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Naturally occurring radio waves are made by lightning or by astronomical objects. Artificially generated radio waves are used for fixed and mobile radio communication, broadcasting, radar and other navigation systems, etc.

Radio waves are a type of electromagnetic radiation with wavelengths in the electromagnetic spectrum longer than infrared light. Radio waves have frequencies as high as 300 gigahertz (GHz) to as low as 30 hertz
By studying the radio waves originating from these sources, astronomers can learn about their composition, structure, and motion.

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The EM spectrum is made up of all electromagnetic waves that are emitted from the sun. It is broken up into smaller categories based off of wavelength