[ WP ] An alien explorer unknowingly find himself in the middle of a orbital war above Earth . What happens next ?

The Alien ship was beautiful. 
 
 Although the recording was slightly blurry, perhaps due to minor damage to that particular optical sensor, but nonetheless, everyone present could see the ship clearly enough. 
 
 It looked like an oddly shaped squid. A glowing, shimmering, opalescent squid. Long, fragile tendrils swept out behind a curved, latticed front. Our sensors had put the overall length at just over a kilometre. 
 
 Long, thin spars spread in curves from the nose of the ship to the back, and they crackled with some form of unidentifiable energy. 
 
 As we watched, the ship moved gracefully to the side, apparently effortlessly, despite there not being any visible means of propulsion. Spinning on it's axis, the tendrils began to separate, opening up with a poetic slowness. 
 
 What this meant would inspire debate for centuries. 
 
 Perhaps some kind of weapon, or a peace offering, or we were witnessing the start of whatever engine process had dropped it, without fuss, into Earth orbit. Whatever it had intentioned, we never found out. 
 
 Your average battleship is seven kilometres of engines, weaponry, and armour. The main laser array on such a ship is capable of melting a sizeable whole in a planet, and the reinforced, nano-technology supported, five hundred meter thick ablative armour was designed to survive a hit from a weapon of a similar class. 
 
 We could only watch as such a ship appeared without warning from the bottom of the viewer, and with the methodical, pondering way that things appear to move in space, calmly shattered the Alien ship in front of it, and carried on out of view. 
 
 Silence reigned over the room as the screen showed only glittering debris, reflecting the blue glow of the Earth below. 
 
 And with that sombre image, the screen froze as the recording ended. 
 
 Nobody moved until the intercom alarm sounded, breaking us from the reverie that only seemed appropriate, given the circumstances. 
 
 `` This is a general alert. Nuclear fast movers inbound. Response crew to emergency posts. Engine ignition in T-minus five minutes. Internal centrifuge section will now shut down.'' 
 
 Everyone stood, and hurriedly left the room. A subtle hum spread through the ship as a thousand different response systems came online, and interdiction lasers began their silent and invisible barrages. 
 
 There was no time to worry about aliens. 
 
 We had a war to fight.
