The Milky Way is a barred spiral galaxy
100,000–120,000 light yearsin diameter containing 200–400 billion stars.
The Galaxy is estimated to contain at least as many planets, 10 billion
of which could be located in the habitable zone of their parent
star.Depending on its structure the entire Galaxy has a rotational rate
of once every 15 to 50 million years.
It’s very difficult to define the age of the Milky Way Galaxy, but
the age of the oldest star in the Galaxy yet discovered is estimated to
be about 13.2 billion years. The Universe is believed to be around 13.73 billion years old.
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