BEIJING, Oct. 26 (Xinhuanet) -- The sun, our
medium-sized yellow star, was far from alone when it was formed, with hundred of
thousands of siblings, according to a new research on Thursday.
"The evidence for the solar sisters was found in
daughters--such as decayed particles from radioactive isotopes of iron--trapped
in meteorites, which can be studied as fossil remnants of the early solar
system," said Leslie Looney, who arrived at the solar sibling finding along with
his colleagues at the University of Illinois at Urbana-Champaign.
These daughter species allowed Looney and his
colleagues to discern that a supernova with the mass of about 20 suns exploded
relatively near the early sun when it formed 4.6 billion years ago; and where
there are supernovas or any massive star, you also see hundreds to thousands of
sun-like stars, he said.
The cluster of thousands of stars dispersed billions
of years ago due to a lack of gravitational pull, Looney said, leaving the
sisters "lost in space" and our sun looking like an only child ever since.