PRAGUE (AP).- Astronomer Tycho Brahe uncovered some of the mysteries of the universe in the 16th century — and now modern-day scientists are delving into the mystery of his sudden death. On Monday, an international team of scientists opened his tomb in the Church of Our Lady Before Tyn near Prague’s Old Town Square, where the famous Dane has been buried since 1601. Brahe’s extraordinarily accurate stellar and planetary observations, which helped lay the foundations of early modern astronomy, are well known and documented but the circumstances surrounding his death at age 54 are murky. Born in 1546 at his family’s ancestral castle, Brahe was in Prague in 1601 at the invitation