Melpomenia (presumably named for Melpomene, the Muse of Tragedy) is a fictional planet in Isaac Asimov's Robot Series, the nineteenth Spacer World settled. It contained a large monument called the 'Hall of the Worlds', which contained a large room with the fifty Spacer Worlds listed with co-ordinates on seven columns; Melpomenia was the origin point. Using data from these columns, translated by Janov Pelorat, Golan Trevize was able to construct a sphere, the centre of which would be roughly close to Earth.
They next go to Melpomenia, the third and final Spacer coordinate they have.
While departing Melpomenia, they notice a carbon-dioxide-feeding moss has begun feeding off insignificant leakages in their space suits.
Barely recognizing this before stepping on their fully pressurized ship â which would have likely been disastrous â they set their blasters to minimum power to fry it off, and then set the ship to heavy UV-illumination before stepping onboard.
They find the remnants of the inhabitants of Earth, who many millennia ago were resettled following events descriped in Asimov's novel "Pebble in the Sky".
The nineteenth Spacer World settled, mentioned in Foundation and Earth.
It contained a large monument called the 'Hall of the Worlds', which contained a large room with the fifty Spacer Worlds listed with co-ordinates on seven columns; Melpomenia was the origin point.