Gliese 710 -- Doomsday Star in Serpens Cauda
The Doomsday Star?
Calling the orange-dwarf star, Gliese 710, a doomsday star is a bit of an exaggeration.
Besides, if it does live up to its name it will not take place for a million-years plus some.  
Gliese 710 will come very close to our sun in about 1,360,000 years.  Recent calculations
indicate that it will enter our sun’s Oort Cloud (a sphere of millions of comets in orbit at the
edge of our solar system) and possibly get as close 0.2 light years from Earth as it
passes by our sun.  Gliese 710 will affect the orbits of countless comets in the Oort cloud
and even those in the much closer Kuiper belt.  Many of the comets will likely be sent in
towards the inner solar system where Earth resides.  It would only take one comet the
size of a mountain to hit Earth for Gliese 710 to earn its name as the Doomsday Star.  
But you can relax, Gliese 710 is currently a safe 62 light years away and is nothing more
than an insignificant telescopic star in the constellation Serpens Cauda.