Look up at the sky if you're on a dark country hill at night. A faint band of light may appear arcing overhead, resembling milk spilled across the sky. The band was named via lacteal by the ancient Romans, which means "milky road" or "milky way."  Of course, the band of light you see isn't milk—a it's galaxy. A galaxy is a large group of stars that are clustered together in space. Our solar system, which consists of the sun, Earth, and seven other planets, is a part of this galaxy known as... you guessed it... the Milky Way.The Milky Way is home to hundreds of billions of stars, including our sun. (Most of these stars, like our sun, have at least one planet orbiting them.) The Earth is roughly halfway between the Milky Way's core and its periphery.Light travels 25,000 light-years from Earth to the centre of the galaxy. (A light-year is the distance travelled by light in one year.) That means that if you could see the core of the Milky Way, you'd be looking at light that may have left Earth before humans arrived in North America.
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