On Halloween, Earth will get an erratic visitor from deep space. A newly detected asteroid — named2015 TB145 —
will pass within nearly 300,000 miles of our planet on October 31st. That's 1.3 times the distance between the Earth and the Moon. It's a pretty big asteroid too, with a diameter somewhere between 950 and 2,100 feet across — somewhere between the height of the Chrysler Building and the Shanghai Tower. As far as we know, it's the closest an object of this size will get to our planet until asteroid 1999 AN10 comes within just one lunar distance of Earth in 2027