Greek Oscar-winning composer Vangelis says his latest composition, commemorating a NASA mission to Mars, stems from a long love affair with space. “Science and mythology were the topics which fascinated me since my early childhood,” the composer said in a pre-concert statement Wednesday. Vangelis, who won an Academy Award for the soundtrack to 1982 film “Chariots of Fire,” will unveil his new composition “Mythodea” at Athens’ Temple of Zeus archeological site on Thursday. The choral symphony, which will feature opera divas Jessye Norman and Kathleen Battle, was composed to mark NASA’s 2001 Mars Odyssey which was launched in April.