Radio telescopes are designed to detect and collect radio waves emitted by celestial objects, allowing astronomers to study the universe at radio wavelengths.

Arecibo Observatory in Puerto Rico was the largest single-dish radio telescope in the world until its collapse in 2020.

Radio telescopes can penetrate clouds and dust, allowing astronomers to observe objects that are hidden from optical telescopes.

Parkes Observatory in Australia played a crucial role in the discovery of pulsars, rapidly rotating neutron stars that emit pulses of radio waves.

The Very Large Array (VLA) is a radio telescope array primarily used to study the structure and evolution of galaxies, as well as other astronomical phenomena.

The Atacama Large Millimeter Array (ALMA) is a radio telescope array located in the Atacama Desert in Chile, known for its high-resolution observations at millimeter wavelengths.

The Square Kilometer Array (SKA) project is a global collaboration to build the world's largest radio telescope, aiming to explore the universe at unprecedented scales.

Parkes Observatory also played a significant role in detecting the first extragalactic water maser, providing evidence for the presence of water beyond our galaxy.

The Atacama Large Millimeter Array (ALMA) is primarily used to study the formation and evolution of stars and galaxies, as well as other astronomical phenomena at millimeter wavelengths.

The Event Horizon Telescope, a collaboration of multiple radio telescopes, was used to obtain the first image of the black hole at the center of our galaxy, Sagittarius A*.

The Very Long Baseline Interferometry (VLBI) technique combines signals from multiple radio telescopes located far apart, effectively creating a single telescope with a much larger baseline, resulting in higher resolution images.

While radio telescopes are not typically used for exoplanet detection, the Kepler Space Telescope, a NASA mission, played a significant role in discovering the first exoplanet orbiting a Sun-like star.

The Square Kilometer Array (SKA) project aims to explore the early universe and the formation of the first galaxies, as well as other fundamental questions in astronomy.

Parkes Observatory also played a crucial role in detecting the first pulsating radio source, PSR B1919+21, which was later identified as a neutron star.

The Atacama Pathfinder Experiment (APEX) telescope is primarily used to study the chemical composition of interstellar clouds, as well as other astronomical phenomena at submillimeter wavelengths.