NASA astroid WARNING: DART mission ‘Earth's last line of defence’ NASA is readying to fire a spacecraft into an asteroid, testing Earth’s last line of defence should a rogue space rock veer onto a catastrophic collision course with our planet. Share: Facebook Twitter Google+ Stumble Digg Email ThisBlogThis!Share to XShare to Facebook Related Posts:Eclipse 2018 - Blood Moon: Longest total lunar eclipse of CENTURY is on July 27Astronomy calendar 2018: Blood Moon, Eclipse and Perseids meteors - top things to seeNASA Again Delays Launch of Troubled Webb Telescope; Cost Estimate Rises to $9.7 BillionTrilobites: Oumuamua Is a Comet, Really.Trilobites: Bumblebees Thrive in the City but Struggle on the FarmEclipse 2018: How to watch the longest lunar eclipse of THIS CENTURY in USA and UK