They're all estimations, there's obviously no way to know
exactly how many stars there are in the entire Universe as its
dimension still remains
unknown.http://www.huffingto...e_n_790563.html When scientists
previously estimated the total number of stars, they assumed
that all galaxies had the same ratio of dwarf stars as the Milky
Way, which is spiral-shaped. Much of our understanding of the
universe is based on observations made inside our own galaxy and
then extrapolated to other galaxies. But about one-third of the
galaxies in the universe are elliptical, not spiral, and van
Dokkum found they aren't really made up the same way as ours.
Using the Keck telescope in Hawaii, van Dokkum and a colleague
gazed into eight distant, elliptical galaxies and looked at
their hard-to-differentiate light signatures. The scientists
calculated that elliptical galaxies have more red dwarf stars
than predicted. A lot more. Generally scientists believe there
are 100 billion to a trillion galaxies in the universe. And each
ga