What is Radio Telescope?

• Unlike optical telescopes, radio telescopes can detect invisible gas and, therefore, they can reveal areas of space that may be obscured by cosmic dust.
• Significantly, since the first radio signals were detected by physicist Karl Jansky in the 1930s, astronomers have used radio telescopes to detect radio waves emitted by different objects in the universe and explore them.
• According to NASA, the field of radio astronomy evolved after World War II and became one of the most important tools for making astronomical observations.

The Arecibo telescope in Puerto Rico, which was the second-largest single-dish radio telescope in the world, collapsed in December 2020.

Significance of SKA telescope

• The telescope, proposed to be the largest radio telescope in the world, will be located in Africa and Australia whose operation, maintenance, and construction will be overseen by SKAO.
• Some of the questions that scientists hope to address using this telescope include the beginning of the universe, how and when the first stars were born, and the life-cycle of a galaxy.
• It would explore the possibility of detecting technologically-active civilizations elsewhere in our galaxy and understanding where gravitational waves come from.
• As per NASA, the telescope will accomplish its scientific goals by measuring neutral hydrogen over cosmic time, and accurately timing the signals from pulsars in the Milky Way.

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