The exact time of the comet's return required the consideration of perturbations to its orbit caused by planets in the Solar System such as Jupiter, which Clairaut and his two colleagues Jérôme Lalande and Nicole-Reine Lepaute carried out more precisely than Halley, finding that the comet should appear in the constellation of Taurus.
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The game is set in six locations: Kenya, defending the ADATA facility; the Arctic, attacking an alien base while defending a human one; the North Atlantic Ocean, where the player must defend oil rigs and attack a second alien base; California, where parts of a fleet to invade the alien's moon base must be defended; the Moon, attacking a further alien base; and a planet in the Crab Nebula, assaulting the planet from which the alien attackers came.
Rosse named the Crab Nebula, based on an earlier drawing made with his older 36-inch (91 cm) telescope in which it resembled a crab.
Professor Samuel Okoye - was black Africa's first PhD in Radio Astronomy who along with Antony Hewish of the University of Cambridge discovered the radio source of Crab Nebula neutron star.