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RFI refers to unwanted signals that interfere with legitimate radio communication, including those between radio telescopes and astronomical objects. Minimizing RFI is crucial to obtaining clear data in radio astronomy.

The Cosmic Microwave Background (CMB) is the thermal radiation left over from the time of recombination in Big Bang cosmology. Radio telescopes can detect this almost-uniform radiation, which provides crucial information about the early universe.

The Radio Window is the range of frequencies from about 10 MHz to 100 GHz that can pass through the Earth's atmosphere without significant absorption. This allows observations by ground-based radio telescopes without the interference caused by atmospheric conditions.

Radio galaxies are types of galaxies that emit large amounts of radio waves. They have active nuclei, often containing supermassive black holes, which accelerate particles to high energies and produce radio emission through synchrotron radiation.

VLBI is a type of astronomical interferometry used in radio astronomy. It involves using widely separated radio telescopes to observe the same object simultaneously, effectively creating a telescope with a diameter equal to the separation between the facilities.

A pulsar is a highly magnetized rotating neutron star or white dwarf, which emits beams of electromagnetic radiation out of its magnetic poles. This radiation can be observed as pulses of radio waves and is a key subject of study in radio astronomy.

Synchrotron radiation is the electromagnetic radiation emitted when charged particles are accelerated in magnetic fields. It is a key component in the radio frequency emission of various astronomical objects, including radio galaxies and pulsars.

A radio telescope is an instrument designed to detect radio emissions from the sky, whether from natural celestial objects or from artificial satellites. They are essential tools for radio astronomy, as they allow scientists to study astronomical phenomena that are often invisible in other wavelengths.

A Radio Quiet Zone is an area where radio transmissions are restricted to minimize radio frequency interference. These zones are critical for radio astronomy facilities to prevent contamination of astronomical data from human-made sources.

Fast Radio Bursts are intense bursts of radio waves that last for only a few milliseconds. They are thought to originate from distant galaxies and their exact cause is currently unknown, making them a focus of contemporary radio astronomy research.

In radio astronomy, a spectral line is a discrete frequency in the radio spectrum that is emitted or absorbed by atoms or molecules. Observing spectral lines allows astronomers to determine the composition, velocity, and environment of celestial objects.