# Radio Astronomy

> Radio astronomy observes the universe at radio wavelengths, revealing phenomena invisible to optical telescopes: rotating neutron stars, the cold hydrogen gas fueling star formation, jets from active galactic nuclei, and enigmatic fast radio bursts crossing the cosmos in milliseconds. The Event Horizon Telescope synthesized a network of radio dishes across Earth into an Earth-sized interferometer, producing the first image of a black hole shadow in 2019. The Square Kilometre Array under construction in South Africa and Australia will be the most sensitive radio telescope ever built, mapping hydrogen emission across cosmic time to trace large-scale structure. Pulsar timing arrays monitoring networks of millisecond pulsars have detected a stochastic gravitational wave background from supermassive black hole binaries.

*Source: [https://selltoscientists.com/fields/radio-astronomy/](https://selltoscientists.com/fields/radio-astronomy/)*

**Researcher count:** 7,200
**Average funding:** $750K

## Subfields

- Radio Interferometry
- Pulsar Timing
- 21cm Cosmology
- Radio Transients
- VLBI

## Key technologies

- Square Kilometre Array
- VLBI Networks
- Fast Radio Burst Detectors
- Phased Arrays
- Software-Defined Radio

## Top institutions

- CSIRO Australia
- Max Planck Institute for Radio Astronomy
- Caltech Owens Valley Radio Observatory
- NRAO National Radio Astronomy Observatory
- ASTRON Netherlands

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