How Do We Know the Milky Way Is a Spiral

Q3: Because of research with high energy particle

Q4: Which of the following is constructed completely

Q5: What are scientists trying to discover when

Q6: The nucleus of helium-4 contains<br>A) one proton<br>B)

Q7: How did the discovery of cosmic microwave

Q9: In what way is the Milky Way

Q10: How did scientists calculate the value of

Q11: According to the current ideas about the

Q12: Which statement about dark matter is accepted

Q13: Why are changes of state in the