TEHRAN (ISNA)-Iran is to hold the third round of International Olympiad on Astronomy and Astrophysics (IOAA) for high school students.

The competition will take place October 17-26 in Tehran and students of 20 countries will take part in the event.

This is the second time that Iran is hosting an international student Olympiad after it successfully held physics Olympiad in 2007 in the central city of Isfahan.

The competition had been held among students of Soviet Union countries, but the first international astronomy Olympiad was held in 1996 between Russia and Sweden and since then it has being held every year in one country.

... Payvand News - 10/16/09 ... --