Alien Offensive Book 2 - The Terraforming of Earth. Alien Offensive, #2

Humankind's first contact with an intelligent extraterrestrial species was not friendly. Because their star, a dying red dwarf, would soon fail to provide life-supporting warmth, a distant alien species recognized Earth, a planet similar to their world, perfect for their needs. In preparation for the move to Earth, the highly intelligent entities implemented a cleverly devised nanobot attack in an attempt to eradicate all life on Earth.
They planned to follow the attack by sending a detachment to terraform the planet and assure all life on Earth was eliminated by the time they arrived. At least that was their plan. Fortunately, they didn't recognize the resolve of the human species to survive. While enlisting the extraordinary talents of a gifted physicist, the first attack was thwarted, but the aliens were not deterred. They had no choice.
It was move or perish. With the immediate threat eliminated, Earth's scientist searched for the origin of the sinister nanobots and learned they came from a planet called Gliese 581-d that was more than twenty light-years away. They began to study the giant, water-covered planet and its weak, red dwarf star. A ten year study via the Hubble Space Telescope showed little change, and then one day, scientist were shocked to see a mammoth flotilla of alien spaceships assemble near the distant planet and set out on a course that would bring them to Earth.
But, because Gliese 581-d was so far away, the scientist weren't too concerned. Even if the alien ships could travel at light-speed, it was decided it would be over two decades before they arrived. Because Einstein predicted nothing other than a photon can travel at light-speed, a theory later proven with the discovery of the Higgs Field, the flotilla wasn't expected to arrive in this century unless they could construct a stable wormhole, something no one believed they could.
However, as a precaution, the world leaders decided to keep a close eye on the mammoth flotilla, code named Target One, and begin working on countermeasures should Target One arrive. They assumed they will have developed more advanced technology, and would be able to repel any future attacks. Should Target One show up in Earth's space earlier than expected, it would be a battle between the might of the greater numbered humans and their determination, against the superior technology of the lesser numbered aliens, and the outcome could not be determined.
That was ten years ago, and in episode two, the surveillance continues .