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Needless to say, this description will involve spoilers.

I recall reading a science fiction short story about a female grad student. Her colleague is in LEO on a space station when a solar flare kills him. The work he leaves behind hints that something is strange about the class of stars the two were investigating before his death. They're studying a sort of dwarf star, and they were trying to figure out how they could be formed. I don't remember why exactly their formation was mysterious.

Later, the grad student is driving to the base of a space elevator located at the top of a mountain. Despite being warned that a heavy snowstorm is approaching, she continues on. She crashes to the side of the road and realizes that without shelter, she'll be in trouble. She knows there is an emergency cabin on the side of the road for this purpose, and heads for it. Just before succumbing to the cold, she sees the red siren light left for just this purpose pulsing in the window of the cabin, and makes it inside safely.

The siren which guided her into the cabin gives her an idea. She discovers that the dwarf stars have an uncharacteristic amount of some radioactive element – I don't remember which one. The big reveal, in a meeting with senior faculty, is that the dwarf stars are artificial, placed there by unknown actors, as lighthouses to warn others away from nearby black holes. She proves this by pointing out that each anomalous star has a black hole near it, each star has the same, unusual amount of radioactive material (she reasons that radiation is a universal symbol for danger), and finally by identifying two more stars that are under construction! Then the story ends.

That's all I remember. Ring any bells?

  • Within the last year. Not in a magazine, but otherwise I don't know. – ravron Oct 3 '16 at 3:37
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This seems to be two related stories by Jack McDevitt and Michael Shara.

"Lighthouse" is the one with two brown dwarfs/sub-brown dwarfs with an isotopic composition that couldn't be formed naturally (50% deuterium) that turn out to have Plutonium-244 in them, and two more are found to be under construction.

The scientist in orbit who's killed by a flare (actually it's a supernova - Gamma Velorum) and leaves hints of a discovery is "Cool Neighbor", with the same characters, involving a brown dwarf companion of the Sun with a life-bearing planet.

Both stories appeared in the 2009 collection Cryptic: The Best Short Fiction of Jack McDevitt.

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