Electromagnetic radiation and Extinction (astronomy)

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Difference between Electromagnetic radiation and Extinction (astronomy)

Electromagnetic radiation vs. Extinction (astronomy)

In physics, electromagnetic radiation (EM radiation or EMR) refers to the waves (or their quanta, photons) of the electromagnetic field, propagating (radiating) through space-time, carrying electromagnetic radiant energy. In astronomy, extinction is the absorption and scattering of electromagnetic radiation by dust and gas between an emitting astronomical object and the observer.

Density

The density, or more precisely, the volumetric mass density, of a substance is its mass per unit volume.

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Electromagnetic spectrum

The electromagnetic spectrum is the range of frequencies (the spectrum) of electromagnetic radiation and their respective wavelengths and photon energies.

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Emission spectrum

The emission spectrum of a chemical element or chemical compound is the spectrum of frequencies of electromagnetic radiation emitted due to an atom or molecule making a transition from a high energy state to a lower energy state.

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Infrared

Infrared radiation (IR) is electromagnetic radiation (EMR) with longer wavelengths than those of visible light, and is therefore generally invisible to the human eye (although IR at wavelengths up to 1050 nm from specially pulsed lasers can be seen by humans under certain conditions). It is sometimes called infrared light.

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Light

Light is electromagnetic radiation within a certain portion of the electromagnetic spectrum.

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Matter

In the classical physics observed in everyday life, matter is any substance that has mass and takes up space by having volume.

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Ozone

Ozone, or trioxygen, is an inorganic molecule with the chemical formula.

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Photon

The photon is a type of elementary particle, the quantum of the electromagnetic field including electromagnetic radiation such as light, and the force carrier for the electromagnetic force (even when static via virtual particles).

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Red

Red is the color at the end of the visible spectrum of light, next to orange and opposite violet.

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Redshift

In physics, redshift happens when light or other electromagnetic radiation from an object is increased in wavelength, or shifted to the red end of the spectrum.

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Star

A star is type of astronomical object consisting of a luminous spheroid of plasma held together by its own gravity.

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Ultraviolet

Ultraviolet (UV) is electromagnetic radiation with a wavelength from 10 nm to 400 nm, shorter than that of visible light but longer than X-rays.

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Visible spectrum

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

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Wavelength

In physics, the wavelength is the spatial period of a periodic wave—the distance over which the wave's shape repeats.

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X-ray

X-rays make up X-radiation, a form of electromagnetic radiation.

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