Excession
Two and a half millennia ago, the artifact appeared in a remote corner of space, beside a trillion-year-old dying sun from a different universe. It was a perfect black-body sphere, and it did nothing. Then it disappeared.

Now it is back.
Science fiction, Fiction, Long Now Manual for Civilization
Iain Banks
Iain Banks (16 February 1954 – 9 June 2013) was a Scottish author. He wrote mainstream fiction under the name Iain Banks, and science fiction as Iain M. Banks, including the initial of his adopted middle name Menzies. In 2008, The Times named Banks in their list of "The 50 greatest British writers since 1945".

Source: Wikipedia