Finding the Sun's 'Long-lost Brother'

Ivan Ramirez has identified the first “sibling” of the Sun — a star that was almost certainly born from the same cloud of gas and dust as our star. Ramirez’ methods will help other astronomers find other “solar siblings,” work that could lead to an understanding of how and where our Sun formed, and how our solar system became hospitable for life.

GMT and McDonald Host Teacher Workshop

McDonald Observatory is partnering with the Giant Magellan Telescope (GMT) Organization to present a teacher workshop starting June 29 that will educate teachers about how the GMT, the world’s largest telescope, will dramatically advance the field of astronomy when it begins operations in 2020.

Share Your Story

As part of our 75th anniversary celebrations, we've created an interactive blog where you can share your memories of McDonald Observatory. We'd like to hear from visitors, scientists, teacher workshop participants — everyone! You can write your story and share photos. You can also read stories shared by others, describing their McDonald experiences from the 1930s up to today. Join in the celebration!

Regents Authorize $50 Million for UT Austin Share in GMT

The University of Texas System Board of Regents recently authorized UT Austin to spend $50 million to participate in building the Giant Magellan Telescope project, which will be the world’s largest telescope when it’s completed in 2020. The project will give students, researchers and faculty the opportunity to make groundbreaking discoveries in astronomy.

Celebrate Our 75th!

Celebrate Our 75th!

Learn about our history and share your own memories.

More information »

In the Sky

Sep 2: First-Quarter Moon

The Moon is at first quarter early today. Sunlight illuminates exactly one-half of the lunar hemisphere that faces Earth. The sunlit portion of the Moon will continue to grow until the Moon is full on September 8, the night of the Harvest Moon.