July 07

1947 – The famous Roswell UFO incident occurs.

• In the early morning, rancher Mack Brazel rode out to do morning farm chores, and found a large amount of strange debris across his land.
  He contacted his local Sheriff, who contacted the closest Army Air Field, thinking it a downed plane.
  Military intelligence swarmed the area, and a press release was issued stating that the Army had found debris from a flying saucer.
  Another press release was issued the next day retracting that statement, saying instead that it was a "weather balloon."

• In our universe, the aliens and UFO in question were Quark, Rom, and Nog, as explained in Deep Space Nine episode "Little Green Men."

1959 – Venus passes over the star Regulus, an event which is used to determine the diameter of the planet, and the structure of its atmosphere.
1981 – The first solar-powered aircraft, Solar Challenger, crosses the English Channel.
2003 – NASA's Opportunity rover is launched into space aboard a Delta II rocket. This rover and its twin, Sprit were anthropomorphized and beloved by scientists and followers.