(1.) "What does it mean that our sun is 93 million miles away? Often we need to translate a number to something more understandable. Light travels at an average speed of 186,281 miles per second. This means that it takes sunbeams about 8 minutes to reach the earth. The star Alpha Centauri is 4.35 light-years away. A light-year is the distance light travels in one year. Even if light year measures distance, it implies time.
If we were to ride on a beam of light, it would take us 4.35 years to reach our closest star. When we look up in the sky we see the past -the star as it appeared 4.35 years ago. Always look at what numbers mean. For example, ask: Does the magnitude make sense? In relation to what? Also, think about what counts -not how it is counted.
There was a sign hanging in the physicist Albert Einstein's office at Princeton that said: 'Not everything that counts can be counted, and not everything that can be counted counts.'"