Our Other Nearest Neighbours
Humanity has been staring at the night sky for thousands of years — building calendars, naming constellations, writing mythology onto the dark. The Egyptians built their entire agricultural calendar around Sirius. It is 8.6 light-years away. They were consulting a neighbour for farming advice and had absolutely no idea.
Previously on the neighbourhood tour: Alpha Centauri got its own episode — Season 3, Episode 7. Thoroughly covered, admirably close, and frankly a bit smug about it. Start there if you haven’t already.
The Locals
Within eleven light-years of Earth, the roster is eclectic. Barnard’s Star is ten billion years old and visibly galloping across the sky. Luhman 16 — the third closest system to Earth — was discovered in 2013, which says something about how thoroughly we’d been looking in the wrong direction. WISE 0855−0714 has a surface temperature colder than many winter nights on Earth and may not qualify as a star by any reasonable definition.
The Famous One
Sirius is the brightest star in the night sky and one of the most recognisable objects in human history. It is also a binary system, its companion a white dwarf — the mass of the Sun compressed into something roughly the size of the Earth. A teaspoon of it weighs approximately five tonnes. The ancient Egyptians considered it divine. They were, in their way, not wrong.
The Dangerous Ones
UV Ceti brightened to seventy-five times its normal luminosity in twenty seconds in 1952. This was not a malfunction. Wolf 359 — yes, that Wolf 359 — is a young, volatile flare star prone to violent X-ray outbursts. The Federation lost thirty-nine ships there. The real science is, if anything, less forgiving.
The Promising One
Epsilon Eridani — known to some as Ran, known to others as the location of Babylon 5 — is a younger analogue of our own Sun, surrounded by debris belts and harbouring a confirmed gas giant. It may be our solar system as it looked several billion years ago. The story there, if there is one, is only just beginning.
We’ve been staring at these stars for millennia. We’re only now beginning to understand what we were looking at.