Their assessment is based on new observations showing other galaxies may have very different structures to our Milky Way galaxy.
The researchers tell the journal Nature that more stars probably means many more planets as well - perhaps 'trillions' of Earth-like worlds.
The Yale University-led study used the Keck telescope in Hawaii.
There are possibly trillions of Earths orbiting these stars”
Professor Pieter Van Dokkum
Yale University
It found that galaxies older than ours contain 20 times more red dwarf stars than more recent ones.
Red dwarfs are smaller and dimmer than our own Sun; it is only recently that telescopes have been powerful enough to detect them."
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