Every new discovery in space begins as a mystery, some mysteries take longer to solve, and others may remain secrets long after humanity is gone.
The Red Rectangle Nebula's rectangular shape may stem from a binary star system at its center, but the obscurity of the system has left the true cause unconfirmed.
Signs of Galaxy X's existence have been found, suggesting it could be a dark matter-rich dwarf galaxy on the outskirts of the Milky Way.
Tabby's Star dims unpredictably, with a significant 22% decrease in brightness, leading to various hypotheses including the possibility of alien megastructures.
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