A mystery interstellar object spotted last week by astronomers could be the oldest comet ever seen, according to scientists.

The European Southern Observatory has captured the clearest images yet of the interstellar visitor 3I/ATLAS as it moves ...

The under construction ESO Extremely Large Telescope in Chile was captured in 2025 and 2023 with the sun rising behind it.

The space-based observatory has revolutionized the way we see space, and it can now add another remarkable accomplishment to ...

The view inside the half-constructed telescope dome, as of May 2024. (Image credit: B. Häußler/ESO) The sky above Cerro Armazones is extremely dry; there is very low precipitable water vapor ...

On Earth, water is so intertwined with life that our search for life on other worlds is essentially a search for water. When ...

The Very Large Telescope is situated atop Cerro Paranal, an 8,645-foot-high (2,635 m) mountain in Chile's Atacama Desert, about 75 miles (120 km) south of the port city of Antofagasta.

The Extremely Large Telescope or ELT will be the most powerful optical telescope ever built. When it opens for business in 2028, it promises to reshape our view of the cosmos.

Construction on ESO's Extremely Large Telescope continues. Here, in this May 1, 2025 photo taken from directly above, the the hexagonal support structure that will hold the ELT's 128-foot (39 ...

The plains house the aptly named Very Large Array (VLA)—a radio telescope made of 27 different antennas, each of which looks like a home satellite dish on steroids. When the antennas are pointed ...

The so-called "Extremely Large Telescope" is being built on a mountaintop in the Andes at an elevation of about 3,000 meters. And it really is extremely large.

The Vera C. Rubin Observatory's primary mirror is 8.4 meters in diameter, which makes it one of the largest optical telescopes in the world. However, the real secret sauce of the telescope is its ...