The vast majority of stars in the Milky Way galaxy are indeed small, cool, red dwarf stars (type-M).

Here's why:

* Stellar Evolution: Stars form from collapsing clouds of gas and dust. The vast majority of these clouds are not massive enough to form large, hot stars.

* Lifespan: Red dwarf stars are much smaller and cooler than our Sun. This means they burn their fuel much more slowly and have incredibly long lifespans (trillions of years).

* Abundance: Because of their long lifespans, red dwarf stars have had plenty of time to form and accumulate in the galaxy. This makes them the most common type of star.

In fact, it's estimated that around 85% of the stars in the Milky Way are red dwarf stars.

This is a significant piece of information in the ongoing search for extraterrestrial life. While red dwarf stars are cool and small, their long lifespans and potential for harboring planets offer intriguing possibilities for life to develop.