week1-060909September 3, 2000: NASA shows that  the hole in the Ozone Layer has grown to 17 million square kilometres, the biggest it had ever been. Antarctic ozone depletion starts in July, when sunlight triggers chemical reactions in cold air trapped over the South Pole during the Antarctic winter. It intensifies during August and September before tailing off as temperatures rise in late November and early December.
September 3, 1976: Viking II lands on Mars and takes the first pictures of the planet's surface.
September 3, 1752: The third day of September is removed from the calendar for eleven years when England and the American Colonies dropped the Julian Calendar, which had become 10 days out of synchrony with the solar cycle and adopted the Gregorian Calendar. People rioted in the streets believing that the government had stolen 11 days of their lives.
September 7, 1936: The last of the Tasmanian Tigers (Thylacine) dies at the Hobart Zoo. The animal had been systematically exterminated by European settlers as an undesirable predator of farm animals.