Isso soa como o conto "The Janitor On Mars", de Martin Amis, publicado no The New Yorker em outubro 26, 1998. O link para o resumo está aqui.
A partir de um ensaio sobre a história:
The Janitor on Mars is about the sole surviving Martian. Mankind has
crossed some threshold called "the tripwire," and as a result the
Janitor took over CNN to broadcast his presence, and invite a coterie
of the intelligent and the beautiful (excluding only politicians and
clergy) to come to Mars and learn the Janitor's secrets. So a mission
was cobbled together, with some help from the Janitor, and eighty-five
or so people went to Mars to hear him out. When they arrived on Mars,
inside Olympus Mons to be precise, the first thing that they learned
was that the Janitor was a robot, and that all the Martians were gone.
The robot told the tale of the history of the Martians, who matured as
a race very quickly after the planets of Mars and Earth were formed,
built up a glorious culture, then, mostly out of boredom, blasted
themselves almost out of existence. The Martians, in keeping with
legends that would be written about their patron billions of years in
the future and an entire planet away, were a very warlike race. They
were also highly advanced. In an uncountable series of wars they
destroyed themselves in seconds, then built their culture back up over
hundreds of thousands of years only to do it again and again and
again.
O link da New Yorker possui um link para a história em seus arquivos, mas você precisa ser um assinante para lê-la.