Stars and GalaxiesStars and Galaxies

Our sun is a Our sun is a starstar.. There are There are

countless morecountless more like it in space.like it in space.

The sun is one of The sun is one of billions of stars that billions of stars that make up the make up the Milky Milky WayWay..

The The Milky WayMilky Way is a is a GalaxyGalaxy..

A galaxy is a cluster A galaxy is a cluster of stars of stars held held together by the together by the force of gravityforce of gravity..

The stars in a galaxy The stars in a galaxy are are veryvery far apartfar apart..

It may take It may take several several yearsyears for a for a spacecraft to reach spacecraft to reach other planetsother planets in in our solar system.our solar system.

It may take It may take several several centuriescenturies to reach to reach other starsother stars in our in our galaxy.galaxy.

Beyond the milky Beyond the milky way there are way there are other galaxiesother galaxies..

Scientists believe Scientists believe there may be as there may be as many as many as 100 000 100 000 million other million other galaxies beyond galaxies beyond oursours. .

Because gravity Because gravity attracts them attracts them together, the stars together, the stars in a galaxy are in a galaxy are clusteredclustered..

This means there This means there are vast expanses are vast expanses of nothing of nothing between different between different galaxies.galaxies.

Stars and GalaxiesStars and Galaxies Our sun is a Our sun is a starstar. There are countless more like it in . There are countless more like it in

space.space. The sun is one of billions of stars that make up the The sun is one of billions of stars that make up the

Milky WayMilky Way. The . The Milky WayMilky Way is a is a GalaxyGalaxy.. A galaxy is a cluster of stars A galaxy is a cluster of stars held together by the held together by the

force of gravityforce of gravity.. The stars in a galaxy are The stars in a galaxy are veryvery far apartfar apart.. Scientists believe there may be as many as Scientists believe there may be as many as 100 100

000 million other galaxies beyond ours000 million other galaxies beyond ours.. Because gravity attracts them together, the stars in a Because gravity attracts them together, the stars in a

galaxy are galaxy are clusteredclustered.. There are vast expanses of nothing between different There are vast expanses of nothing between different

galaxies.galaxies.