All Acronyms. CTA - Control Terminal Agency [Internet]; April 13, 2017 [cited 2017 APR 13]. Available from: https://www.allacronyms.com/CTA/Control_Terminal_Agency.
There are almost 120 known elements. For example, you are made up of billions of billions of atoms but you probably won't find more than 40 elements (types of atoms) in your body. Chemists have learned that over 95% of your body is made up of hydrogen (H), carbon (C), nitrogen, oxygen, phosphorus (P), and calcium (Ca).
That number is bigger than the number of stars in the Universe, which is estimated at 10*21 or 10 followed by 21 zeros (10,000,000,000,000,000,000,000). Very roughly, each human body contains: 4,700,000,000,000,000,000,000,000,000 hydrogen atoms, 1,800,000,000,000,000,000,000,000,000 oxygen atoms,