Question 1
The Sun is composed almost entirely of two gases. They are hydrogen and ________.
◦ magnesium
◦ xenon
◦ argon
◦ helium
Question 2
The amount of energy released during a nuclear reaction was established by the well-known scientist named ________.
◦ Albert Einstein
◦ William Hershel
◦ Christiaan Huygens
◦ Enrico Fermi