Radio astronomy in your browser

Learn radio astronomy with real radio telescopes available for free for anyone to use.

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One of the two SALSA dish antennas at Onsala Space Observatory.

The SALSA telescopes

The SALSA telescopes are available for anyone who wants to try out radio astronomy. They are about 2m in diameter and are part of the Onsala Space Observatory in Sweden.

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Plot of the 21 cm hydrogen line spectrum produced by a SALSA observation.

Guided experiments

Follow guided lab experiments to map the spiral structure of the Milky Way using the 21 cm hydrogen line, track GNSS satellites, or measure the telescope beam pattern using the Sun.

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