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Participants at the 'World's Largest Astronomy Lesson' look towards the Southern Cross to observe the Wishing Well open cluster of stars at about the halfway point of the lesson. Credit: John Goldsmith / celestialvisions.com.au.

Participants at the ‘World’s Largest Astronomy Lesson’ look towards the Southern Cross to observe the Wishing Well open cluster of stars at about the halfway point of the lesson. Credit: John Goldsmith / celestialvisions.com.au.