Asteroid Belt. About 2-4 AU (186-370 million miles) away from the Sun, between the orbits of Mars and Jupiter, is a region called the Asteroid Belt. This region is a ring of tens of thousands of relatively small rocky objects called Asteroids. Asteroids can vary greatly in size.
A normal pulse rate for a healthy adult, while resting, can range from 60 to 100 beats per minute, depending on athletic ability. [ Source: http://www.chacha.com/question/what-is-your-pulse-supposed-to-be ].
Your resting heart rate is your number of heartbeats per minute when you are not moving. For an adult, this can range from 60 to 100 beats per minute. If you are very athletic, your resting heart rate may be as low as 40, which often indicates a higher level of cardiovascular fitness.