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2026
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Source-derived question
Why did radio astronomers initially call objects like 3C 273 'quasi-stellar radio sources'?
Astronomical Instruments and Observatories
Galaxies and Large-Scale Structure
Radio Astronomy
Sources that address it
Quasars confirmed as a new cosmological class of objects
almanac
Related questions
How did Cyril Hazard use a lunar occultation to pin down the position of 3C 273?
How did Jansky determine that the persistent radio hiss was coming from the direction of the galactic centre?
How did linking eight radio observatories across four continents effectively turn Earth into a single telescope?
What did the 15.8% redshift in 3C 273's spectrum reveal about its distance from Earth?
What later astronomical discoveries grew out of the field of radio astronomy that Jansky's antenna founded?
What was the Arecibo Message, and why was it aimed at the globular cluster M13?
Why did 3C 273's brightness at such a vast distance imply a supermassive black hole?
How did Arecibo's design use a natural limestone sinkhole to support its 305-metre dish?