Speed is the measure of motion. You can find it by dividing the distance covered by the time it takes to travel that distance.
If a star is 10 light-years away, it is about 60 trillion miles distant.
Light travels through space at 186,000 miles per second.
A light ray travels 5.88 trillion miles a year in space.
The star Sirius is 9 light-years away from the solar system.
|Fahrenheit and Celsius (Centigrade) Scales||Measurement||Measuring Power|