What does the Milky Weigh? NASA calculates the mass of our galaxy
It’s not as if there’s a scale big enough to weigh the entire galaxy — but astronomers have now calculated the approximate mass of the Milky Way. Researchers using NASA’s Hubble Space Telescope and the European Space Agency (ESA)’s Gaia satellite have calculated that our galaxy weighs 1.5 trillion solar masses, or 1.5 trillion times the weight of our Sun. Even though there are a mind-bending 200 billion stars in the galaxy, these actually only account for a small fraction of the total mass....