Space
Veteran Nasa engineer declares aliens are REAL - but have yet to reach Earth
Donald Trump ordered the release of classified government documents relating to UFOs last week
Scientists capture all-new 3D view of Uranus and go inside planet's upper atmosphere for first time
New videos show the plannet spinning in place - as well as its own Northern Lights
Nasa admits Earth is DEFENCELESS against 'city-killer' asteroids
Up to 15,000 medium-sized asteroids are left undetected
