Another star passes close to our solar system

Apparently some 70,000 years ago a small red star called Scholz's star passed close to our solar system. According to a report at Space.com:

 "... a red dwarf called Scholz's star apparently grazed the solar system 70,000 years ago, coming closer than 1 light-year to the sun.
...Scholz's star passed by the solar system at a time when early humans and Neanderthals shared the Earth. The star likely appeared as a faint reddish light to anyone looking up at the time..."

The research involved studying the orbits of objects on the edges of our solar system and working out how these orbits changed over the ages.