Question 1
What two elements formed first?
◦ helium and oxygen
◦ helium and hydrogen
◦ protons and neutrons
◦ electrons and protons
◦ hydrogen and oxygen
Question 2
Apparent magnitude is ________.
◦ how large stars appear to be from Earth
◦ how bright stars appear to be from Earth
◦ how bright stars truly are
◦ how large stars truly are