According To recent research some Scientist telling that Our Sun Born with Twins 4.5 Billion Years Ago.
photo credited by: NASA.
Our Nearest Star Alfa Century have Triplet system.
Scientist make a mathematical model that suggest that all Sun like stars have binaries.
All Sun' born inside Egg shaped Cocoons called dense Cores and eventually Seperates but locked in very Far away orbit.
Scientist recently observed a New formed Star in Perceous Constellation which is the 24th largest Constellation in the sky which have a twins.
Scientist are now looking for our Sun Twins called Nemesis.
This binary Sun, Nemesis locked with our Sun in very Far away Orbit and its return after nearly 26 millions years Every times.
Some scientist believe that It's the Nemesis who kicked a huge Astroid into our plannet orbit and Astroid collide with Earth and our Dinosaurs are wiped out completely from our Plannet.
Every times Nemesis come into existence it can cause huge Destruction to our planet by bringing any Huge Comment or Big Astroid.
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Source:
http://googleweblight.com/i?u=http://www.livemint.com/Science/JknwxIlEL1vUuMYNaKzqlO/Our-Sun-was-likely-born-with-a-twin-star-study.html&grqid=oQmZW5P8&hl=en-IN