SpaceX's Demo-1 green lit for launch as Virgin enjoys a brief ménage à trois aboard VSS Unity

Plus: Up close and personal with Ultima Thule and Fregat saves the day
Roundup Scientists sharpened their view of Ultima Thule last week, while three more space Virgins popped their commercial astro cherries aboard SpaceShipTwo and Elon Musk revealed the fate he has in store for last week's Falcon 9.…