BlyII

BlyII is a fictional exoplanet that appears as the second world orbiting a star in the Bly system in multiple science fiction works. It is used as a plot device to explore planetary science, astrobiology, and first-contact scenarios. Because BlyII is a fictional construct, its exact properties vary by author and franchise, and there is no canonical real-world specification.

In many depictions, BlyII possesses one or more of the following features: a temperate to ocean-dominated climate, a magnetic field, and a diverse biosphere; in other versions it is portrayed as a desert world or an ice-covered globe with subsurface oceans. Some stories feature human colonists or alien civilizations on BlyII, alongside ruins or artifacts that hint at earlier intelligent life.

Discovery and exploration narratives recount BlyII's detection through telescopic surveys, spectroscopic analysis of its atmosphere, or data from deep-space probes. Missions to BlyII in some works lead to breakthroughs in technology, diplomacy, and ethical debates about terraforming or planetary protection.

In real-world usage, BlyII is not recognized as a real astronomical object. It commonly appears in fan wikis, role-playing game lore, and speculative essays as an example of a hypothetical second planet in a system and as a convenient shorthand for discussing exoplanet science. Related topics include exoplanets and fictional planets.