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FRBs are high-energy astrophysical phenomena manifested as transient radio pulses lasting only a few milliseconds. They are of unknown origin but are believed to come from distant galaxies and release enormous amounts of energy.

Quasars are extremely luminous active galactic nuclei with supermassive black holes at their center. They emit strong radio emissions and can exhibit radio jets visible at great distances across the electromagnetic spectrum.

Magnetars are a type of neutron star with an extremely powerful magnetic field, which can lead to sporadic and intense bursts of X-rays and gamma rays. They can also emit regular radio pulses, making them detectable as pulsating radio sources.

Radio galaxies possess active galactic nuclei that are highly luminous at radio wavelengths. They often show extensive lobes and jets that emit radio waves originating from relativistic electrons spiraling through magnetic fields.

The remains of a supernova explosion, supernova remnants interact with surrounding interstellar material, producing synchrotron radiation observed at radio frequencies as expanding shells or rings of emission.

GRBs are extremely energetic explosions observed in distant galaxies, characterized by brief but intense emission of gamma rays. They can produce afterglows at radio wavelengths, often continuing for several days after the initial burst.

Cosmic rays are high-energy particles from space that hit the Earth's atmosphere. They indirectly produce radio emissions upon interaction with the Earth's magnetic field and atmosphere, resulting in air showers that can be detected at radio frequencies.

The CMB is the thermal radiation left over from the time of recombination in Big Bang cosmology, filling the universe almost uniformly. In radio frequencies, it exhibits a blackbody spectrum with a peak wavelength at approximately 1.9 mm, corresponding to a temperature of about 2.725 K.

Molecular clouds are dense regions of gas and dust where stars form. They can be observed in radio frequencies through emission or absorption lines of molecules like CO, pinpointing the colder and denser areas of the interstellar medium.