Long ago, before our planet earth existed, our solar system was a spherical cloud of gas and dust, and as wide as a light year (9.5 trillion kilometers across). ... That is just what we can see, because we can only see and look so far, due to the limitation of light. ... If we sent out radio waves of communication, at the speed of light it would take roughly 2.3 million years to get there. ... And a trip from one galaxy billions of light years away to another galaxy could seem like going from town to town for humans. ...

• Word Count: 1533
• Approx Pages: 6
• Has Bibliography
• Grade Level: High School