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GALAXY

The universe contains more than 125 billion galaxies, immense aggregations of stars, gas, dust,and dark matter bound by their own gravity. Galaxies very in size, luminosity, and maas. The largest are a million times brighter than the faintest. Galaxies take one of three primary shapes :elliptical, spiral, and irregular.

Milky-way facts

• Type of galaxy – spiral
• Total mass –1-3 trillion solar masses including dark matter
• Disk Diameter – 100,000 light-year
• Number of stars – 100-400 billion
• Age of oldest star cluster – 13.5 billion years
• Distance of nucleus from sun–26,000 light years