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The radio signal at about 1.428 GHz, corresponding to a wavelength of about 21 cm,
is the lowest frequency that can result from anything happening inside an atom. That
also means it's the lowest energy photon that an atom ever absorbs or spits out. It's
the tiny difference in energy between the single electron in a hydrogen atom spinning
in one direction versus spinning in the other direction.
The electrons in vast cold clouds of hydrogen in interstellar space are always randomly
flipping their spin directions, either absorbing or emitting 1.428 GHz photons when they
do it. So monitoring that frequency from space with a radio telescope gives information
about where these hydrogen clouds are and how large they are.
1.428 GHz is easy to monitor with radio equipment. It's a lower frequency than GPS,
household microwave ovens, and many 4G and LTE 'mobile data' bands. The main
challenges to any useful research applications are in assembling a receiver that's
sensitive enough to detect very weak signals from space, and a 'dish' antenna that's
big enough to be able to tell exactly what direction the signal is coming from.
What else can I help you with?
What are the six kind of radiation that astronomers study?
yuba chuba
What kind of spectrum do astronomers find most useful?
Astronomers find the electromagnetic spectrum most useful during their observations and research. This spectrum includes various types of radiation such as visible light, radio waves, X-rays, and gamma rays, which provide valuable information about the properties and behavior of celestial objects. By studying different wavelengths of light, astronomers can gain insights into the composition, temperature, and movement of objects in the universe.
Which wavelength range in the electromagnetic spectrum has proved to be the most useful in investigating star birth in dense molecular clouds?
The submillimeter wavelength range, specifically around 1 millimeter, has been proven to be the most useful in studying star birth in dense molecular clouds. This range allows astronomers to peer through the dense dust clouds where stars are forming, revealing critical details about the early stages of star formation. By observing at submillimeter wavelengths, astronomers can study the cool dust and gas that are signatures of young stellar objects.
Explain how astronomers use electromagnetic radiation to study space?
Electromagnetic radiation is "light." Light in various wavelengths (gamma rays through to infrared) comes to us from out in space, and astronomers use instruments called telescopes to capture it and observe the bodies and processes emitting this light.
What do you call people that study outer space and the solar system?
Mainly astronomers. But cosmologists and astrophysicists will also be interested in outer space.
What information does 21cm radiation provide about the gas clouds?
presence of ionized hydrogen
Which is bigger 21cm or 205mm?
205mm = 20.5cm 21cm > 20.5cm
What are the six kind of radiation that astronomers study?
yuba chuba
What information does 21 cm radiation provide about the gas clouds?
21 cm radiation provides information about the distribution, temperature, and motion of atomic hydrogen gas clouds in interstellar space. By studying the spectral line of this radiation, astronomers can infer the presence of these gas clouds, their speed, and even their magnetic field strength. This data helps in understanding the structure and dynamics of the Milky Way galaxy and the universe as a whole.
Why astronomers study radiation beyond the violet end of visible light and beyond the red end of visible light?
Astronomers study as much of the spectrum of radiation as they can, and the visible spectrum is only a small segment of it.
What is one third of 21cm?
1/3 of 21cm = 1/3*21 = 7 cm
how to calculate the fifth of 21cm?
A fifth of 21cm is 1/5 x 21 1/5 of 21 is 21/5, which is equal to 4.2 A fifth of 21cm is 4.2 cm
What kind of spectrum do astronomers find most useful?
Astronomers find the electromagnetic spectrum most useful during their observations and research. This spectrum includes various types of radiation such as visible light, radio waves, X-rays, and gamma rays, which provide valuable information about the properties and behavior of celestial objects. By studying different wavelengths of light, astronomers can gain insights into the composition, temperature, and movement of objects in the universe.
Which wavelength of radiation do astronomers use to detect these hottest stars in our galaxy?
infrared
Which wavelength of radiation do astronomers use to find the hottest stars?
x rays
What is the approximate diameter of a circle whose circumference is 21cm?
The approximate diameter of a circle whose circumference is 21cm is: 6.68cm
Can nuclear radiation be useful?
Certainly.
