Daily celestial challenge: structure

In today #celestialchallenge,I will be talking bout solar system once had ‘evil twin’ sun
which may have wiped out dinosaurs.
source

Solar system.

The Solar System once had two suns,scientists believe,and one of them may have wiped out dinosaurs.

A theoretical physicist at the University of
California and an astronomer from Harvard
University have discovered that most stars are
born with a ‘brother’ and our own Sun is likely
to be no exception.

In fact,this‘ evil twin’ which has been dubbed
Nemesis, may have been responsible for
kicking an asteroid into Earth’s orbit which led
to the extinction of the dinosaurs.

In the 1980s, two paleontologists from the
University of Chicago suggested that the
regular rate of mass extinctions on Earth -
every 26 million years - was caused by a
mysterious extraterrestrial source.But,despite
years of searching,nobody could ever find it.