It’s a reference to The Hitchhiker's Guide to the Galaxy, in which
... a race of hyper-intelligent pan-dimensional beings ... built a computer named Deep Thought to calculate the Answer to the Ultimate Question of Life, the Universe, and Everything. When the answer was revealed to be 42, Deep Thought explained that the answer was incomprehensible because the beings didn't know what they were asking. It went on to predict that another computer, more powerful than itself would be made and designed by it to calculate the question for the answer....
The computer, often mistaken for a planet (because of its size and use of biological components), was the Earth, and was destroyed by Vogons to make way for a hyperspatial express route five minutes before the conclusion of its 10-million-year program.
Hope that helps, :-)