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In the 1940s, the first-time radio telescopes were turned towards the heavens. The radio signals were coming from all directions. Astronomers turned their ordinary telescopes to these radio signals to understand what was coming from them. They discovered many things, among them objects which could not be classified. The objects looked like tiny dots of light in the sky, just like the star we see with our naked eyes.
Looking through massive telescopes, they appeared blurry, which meant they were very far away. The Hubble telescope ranges these objects from 2.6 to 16 billion years away. This was how the quasar star was discovered.
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