Question

Is the earth and our solar system contained entirely in one galaxy?

Answer 1

The Milky Way is a barred spiral galaxy with a diameter between 150,000 and 200,000 light-years (ly). It is estimated to contain 100–400 billion stars and more than 100 billion planets.
Number of stars: 100–400 billion
Type: Sb, Sbc, or SB(rs)bc (barred spiral galaxy)
Spiral pattern rotation period: 220–360 Myr
Bar pattern rotation period: 100–120 Myr

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Answer 2

Earth is located in one of the spiral arms of the Milky Way (called the Orion Arm) which lies about two-thirds of the way out from the center of the Galaxy. Here we are part of the Solar System - a group of eight planets, as well as numerous comets and asteroids and dwarf planets which orbit the Sun.