AN ASTEROID which came crashing into Earth and NASA had no idea it was coming reiterates the need to keep a closer eye on the sky in case a massive space rock comes hurtling towards our planet. A small asteroid shot towards Earth at 14.9 kilometres per second, and NASA admitted it did not know it was coming. The space rock known as 2019 MO was just three metres wide and exploded when it hit the planet’s atmosphere on 22 July above the Caribbean, but the way it approached unexpectedly reaffirms the need for more eyes on the sky. NASA...