Poster The Cross-Border Schools Science Conference, on Wednesday 29th and Thursday 30th April 2009, aims to bring together some 260 students (130 on each day) aged 13 to 14 (Key Stage 3) from 16 or more schools on both sides of the Border to learn about astronomy and related sciences and mathematics, using the facilities of the Armagh Observatory and the Armagh Planetarium, a combination on the same site unique on the island of Ireland. ... The conference will be free to students and teachers. ...