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As empirical experiments are almost impossible in astronomy, research in this field relies heavily on observation. Prof. Andrzej Udalski set new frontiers in observational astronomy, in particular in the search for extra-solar planets, using a cutting-edge gravitational microlensing technique which enables the study of celestial objects irrespective of the light they emit.
The discovery, conquest, and subsequent colonization of the Americas gave rise to surprising, multifaceted encounters between the Old and New Worlds. These encounters were not limited to the first-contact phase or to the military subjugation of new lands by the Europeans. They have been long processes of cross-cultural communication—in which both sides participated equally—that continued to develop through the colonial and postcolonial eras up to the present day.