The star streams in the Milky Way were named Theia after the Greek goddess of heavenly light. Scientists have discovered that about 500 stars belonging to a star stream called Theia 456 were born at the same time and are now moving together in the same direction.
The stars are usually in clusters that are circular in nature, but the star stream contains stars lined up linearly. This relatively linear structure, according to scientists, was formed when stars that were once dense clusters gradually broke apart and were stretched by tidal forces. This new study also found that there are about 8,292 such streams in the Milky Way.
“We found that stars exist as more structures than clusters. They often form these streams across the sky. Although we’ve known this for a long time, now we’re starting to get answers as to how it happens,” said Jeff Andrews, an astrophysicist at Northwestern University
Theia 456 reaches 500 light-years away in a place where it is very difficult to see because it gets lost against the background of 400 billion stars in the Milky Way. However, it differs in that it is not a small cluster, but is in fact very long and elongated. A team of astrophysicists discovered that these stars were born at the same time by examining their iron content, and found that they are twins 100 million years old. They were born together – and are still moving together in space.