The answer is very simple. The nuclear fusion process that takes place in the central region of the sun converts hydrogen into helium plus energy. One thousand grams of hydrogen produces 993 grams of helium with 7 grams of mass being converted into energy via E=mc2. The sun formed from a massive cloud of gas about 5 billion years ago. It took about 50 million years to form. When it was a newborn star, it had enough hydrogen fuel for 10 billion years.
Definition of crunch. 1  intransitive verb. 2  1 : to chew or press with a crushing noise. 3  2 : to make one's way with a crushing noise. 4  transitive verb. 5  1 : to chew, press, or grind with a crunching sound. 6  2 : process; especially : to perform mathematical computations on crunch numbers.
Video: Abdominal crunch. Dr. Laskowski: The abdominal crunch is one of the most common exercises used to train the abdominal muscles. The abdominal crunch targets the abdominal muscles, which are part of your core muscle group. The stronger your core muscles, the easier it is to do most physical activities and sports.Nicole Krupa: There are many ways to do an abdominal crunch, but proper technique will give you the most benefit. To isolate your abdominal muscles, lie on your back with your knees slightly bent.Make sure your feet are planted firmly on the floor and about hip-width-distance apart. Keep your knees comfortably apart. Fold your arms on your chest and tighten your abdominal muscles. Raise your head and shoulders off of the floor.he stronger your core muscles, the easier it is to do most physical activities and sports. Nicole Krupa: There are many ways to do an abdominal crunch, but proper technique will give you the most benefit. To isolate your abdominal muscles, lie on your back with your knees slightly bent.