The Hooker telescope on Mt. Wilson. At 100 inches, it was the largest telescope in the world from 1917 to 1949 and was used by astronomers to measure the expansion of the universe.

The Mount Wilson Observatory was once home to the world’s largest telescope, and more than a century ago, on Jan. 1, 1925, astronomer Edwin Hubble made one of his most important discoveries at ...

The Mount Wilson Observatory was once home to the world’s largest telescope, and more than a century ago, on Jan. 1, 1925, ... changing the way we view the universe.

One of 41 bromide photographic prints related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope at Mount Wilson, Calif. This view shows the side members ...

Mount Wilson Observatory has canceled its live, in-person event to view Monday’s solar eclipse, due to bad weather that could make access to the site hard and hazardous. The observatory, perched ...

Mount Wilson Observatory, located on Mount Wilson above Pasadena, will host a free public event; ... Visitors are invited to view a live stream in the observatory's auditorium on April 8, ...

Mount Wilson Observatory has canceled its live, in-person event to view Monday’s solar eclipse, due to bad weather that could make access to the site hard and hazardous.

Mount Wilson Observatory has canceled its live, in-person event to view Monday’s solar eclipse, due to bad weather that could make access to the site hard and hazardous. The observatory, perched ...

Mount Wilson Observatory has canceled its live, in-person event to view Monday’s solar eclipse, due to bad weather that could make access to the site hard and hazardous. The observatory, perched ...