Virtual Guided Tour ESO's Paranal Observatory. Saturday, April 11th, 17:00h CEST.

Why It Matters

Paranal’s advanced telescopes and interferometric capabilities drive next‑generation astronomical research, while the upcoming ELT will cement ESO’s leadership in global science and technology innovation.

Key Takeaways

• ESO operates world‑leading observatories in Chile’s Atacama Desert.
• Paranal hosts the VLT, four 8.2‑m telescopes and auxiliary units.
• Interferometry links telescopes to simulate a 200‑m aperture.
• Active optics uses 115 actuators to maintain mirror shape in real time.
• Upcoming ELT will become the largest visible‑light telescope on Earth.

Summary

The video offers a live‑style virtual tour of the European Southern Observatory’s Paranal site, led by veteran guide Farid Char and producer‑student Hector Salas. They introduce ESO’s multinational framework, its three Chilean locations, and focus on Paranal, home to the Very Large Telescope (VLT) and the future Extremely Large Telescope (ELT).

Viewers learn that the VLT comprises four 8.2‑meter Unit Telescopes (UTs) named Antu, Kuyén, Melipal and Yepun in the Mapudungun language, plus several 1.8‑meter Auxiliary Telescopes (ATs) that can be repositioned on a rail system. By combining light through interferometry, the array can mimic a 200‑meter aperture, delivering resolution up to sixteen times finer than a single dish. The tour also explains the active‑optics system: 115 computer‑controlled actuators continuously reshape the 22‑ton Zerodur primary mirror to counteract gravity‑induced deformations.

A striking detail is the layered optical path—primary, secondary and tertiary mirrors directing starlight to interchangeable instruments that convert photons into digital data for astronomers in the control building. Engineers perform daily calibrations, while night‑time observations are conducted by scientists worldwide, illustrating the seamless blend of high‑tech hardware and human expertise.

The showcase underscores Paranal’s strategic location in the Atacama’s ultra‑dry, low‑light‑pollution environment, which yields over 300 clear nights annually. As ESO prepares the ELT, the site’s proven infrastructure and cutting‑edge optics position it to remain a global hub for breakthrough discoveries in exoplanets, cosmology and high‑energy astrophysics.

Original Description

#TourESO

Discover the Paranal Observatory in our next virtual guided tour. Join us online, on Saturday, April 11th, from 17:00 CEST / 11:00hrs CLT. Make sure to watch us live, as the tour will not be available as a recording after the streaming. Streamed here on Facebook and on our YouTube channel: http://orlo.uk/sdrfx Visitors who open our Facebook ESO Astronomy page ahead of the starting time should refresh their browser when the tour starts.