Globular Cluster 47 Tucanae, Home to 35,000 Stars  
NASA and Ron Gilliland (Space Telescope Science Institute)
Home | Get Involved | Contact Us | NewsCenter | Projects | Resources | Working Groups | FAQ  

Welcome To IYA

In the year 2009, the world celebrated the International Year of Astronomy as it commemorated the 400th anniversary of Galileo 's use of a telescope to study the skies, and Kepler 's publication of Astronomia Nova . 2009 was also the anniversary of many other historic events in science, including Huygen's 1659 publication of Systema Saturnium. This is modern astronomy's quadricentennial, and the 2009 Year of Astronomy is be an international celebration of numerous astronomical and scientific milestones. Events are still being planned, and you are invited to tell us how you want to celebrate. This page is a product of the U.S. 2009 IYA team, and we want to help you make 2009 a year long celebration to remember.

Spread the word: the Universe is yours to discover. Celebrate IYA 2009.

Many International Year of Astronomy Programs Continuing

iya_logo_beyond The International Year of Astronomy 2009 is closing with a full moon, a " Blue Moon " that seems a fitting conclusion to such an event-filled year.

We would like to thank everyone for the many hours of dedicated volunteer time that went into making IYA2009 such a huge success! Although IYA2009 is coming to an end, many programs and events will be continuing. Please download a listing of the Continuing Programs as well as a Calendar of Astronomy Events that are coming up in 2010 and beyond.

Reach for the Citizen Sky — During IYA2009 and Beyond!


Image by Brian Thieme and courtesy

This fall a bright star will begin a puzzling transformation that only happens every 27 years. To help study this event, astronomers have launched a new citizen science project called “Citizen Sky” at .

Epsilon Aurigae is a bright star that can be seen with the unaided eye even in bright urban areas of the Northern Hemisphere from fall to spring. This fall it is predicted to gradually lose half its brightness until early winter. It will remain faint during all of 2010 before slowly regaining its normal brightness by the summer of 2011.

Since its discovery in 1821, the cause of this dip in brightness has remained a mystery to astronomers. But this time they have a powerful new resource to help study the upcoming event: thousands of citizen scientists.

“This star is too bright to be observed with the vast majority of professional telescopes, so this is another area where public help is needed,” said Dr. Arne Henden, director of the American Association of Variable Star Observers (AAVSO).


Shopping Centers Across the U.S. to Experience “The World At Night”

An exhibit of stunning photographs of the night sky as viewed over many of the most beautiful natural, historic and cultural landmarks in the world is being shown at 24 shopping centers across the United States from now through November 8.

Known as “The World At Night,” the exhibit is a special project of the International Year of Astronomy 2009 (IYA2009), an ongoing global celebration of the science of astronomy and its contributions to society over the 400 years since Galileo’s first use of the telescope.

Among the well-known sites featured in “The World at Night” (TWAN) are Yellowstone National Park in the United States, the Parthenon in Greece, and magnificent monuments across Asia, all set against the grandeur of the starry sky. Supported by Developers Diversified Realty for the properties it manages, this exhibition is the largest showing of TWAN mounted in the
United States during IYA2009, according to the organizers. More than 30 countries have hosted TWAN exhibits this year.


Additional News


International Year of Astronomy 2009 (IYA)