1. From what you know about stellar evolution, the interstellar medium, and the spiral density wave theory, explain the appearance and structure of the spiral arms of grand-design spiral galaxies.
2. The solar system was located in an active starforming region in a spiral arm, rather than on the edge of the Orion arm? How would the solar system be different?
Already registered? Login
Not Account? Sign up
Enter your email address to reset your password
Back to Login? Click here