There’s no need to panic though as Asteroid 388945 (2008 TZ3) should pass us from a distance of about 3.5 million miles away. That may sound pretty far away but in the grand scheme of space this isn’t a large distance at all. That’s why Nasa has still flagged it as a “close approach”. If an asteroid comes within 4.65 million miles and is over a certain size, it’s considered “potentially hazardous” by cautious space agencies. Sunday’s asteroid fits this description. It should shoot past from its safe distance at a speed of just over 18,000 miles per hour. Nasa...