A galaxy is a gravitationally bound system of stars, stellar remnants, interstellar
gas, dust, and ... Many galaxies are thought to have black holes at their active
centers. ... 10<sup>11</...
Apr 1, 2014 ... Astronomers say there are 100 billion to 200 billion galaxies in the universe. But
accurately counting the number of galaxies depends on ...
Jul 18, 2014 ... Scientists estimate how many galaxies there are in the observable universe by
counting up the number of galaxies in a tiny bit of the sky, and ...
www.ask.com/youtube?q=How Many Galaxies Are There in the Universe?&v=bENTuGmw0Sg
Oct 13, 2011 ... With many galaxies and more that have not been discovered, .... was to find out
how we know that there aren't many more galaxies further away ...
Hipparcos mapped millions of stars in our galaxy, but how many more are there?
... you will be able to estimate how many stars there are in the Universe today.
Jan 23, 2014 ... 100 years ago, we thought the Milky Way was the full extent of the Universe,
containing everything. Now, we know we're just one of many.
May 4, 2009 ... And our Solar System is just one member of a vast Milky Way galaxy with 200 to
400 billion stars. But how many galaxies are there in the entire ...
Oct 10, 2012 ... Ethan Siegel is a theoretical astrophysicist living in Portland, Oregon, who
specializes in cosmology. He has been writing about the Universe ...
Apr 15, 2016 ... Our galaxy, the Milky Way, is typical: it has hundreds of billions of stars, ...
Galaxies. Universe Galaxies-1 Milky Way Artist's Conception - The ...
Jun 23, 2015 ... How many galaxies are there in the observable universe? How many cells are
there in the human body? We know both of these numbers must ...