A red dwarf could greatly affect life on Earth. In 1984 Richard Muller and others proposed that Nemesis, an unseen companion to our Sun, might cause mass extinctions. By this hypothesis, the unseen Nemesis orbits into the Oort Cloud of comets every 27 million years, causing comets to spiral toward the inner solar system. In 1999 John Matese and Daniel Whitmire, using comet observations, made a similar hypothesis. The hypothetical object could be a brown dwarf, slightly larger than Jupiter, or a larger red dwarf.
The inky black of empty Space is far from empty. Today it is thought to be home many more red dwarf stars than once thought. It could also contain brown dwarfs, objects like Jupiter, in unknown numbers. Potentially Space could also contain primordial Black Holes, some of which form the cores of larger objects. One of these objects, orbiting our Sun, could cause the mass extinctions on Earth. There is far more in the Universe than meets the eye.