Explain how the spectrum arises.

12) The Sun is primarily composed of hydrogen and helium, with traces of other elements. Its visible surface, the photosphere, is a dense and nearly opaque gas at a temp of 6000 K. Describe the spectrum that originates at this surface, due to the physical state of the material. Explain how the spectrum arises.

Why is the North Star called the North Star?

Why is the North Star called the North Star? Include where in the sky it is when viewed from the North Pole, your location, and the Equator. Also include what is meant by circumpolar stars?

How do you explain planet retrograde motion by the Earth-center hypothesis? By the Sun-center hypothesis?

How do you explain planet retrograde motion by the Earth-center hypothesis? By the Sun-center hypothesis?

A comparison of the science of Earth as compared with the other planets in our solar system.

A comparison of the science of Earth as compared with the other planets in our solar system. a. Much is known about planet Earth, as it is our home planet. It is therefore an ideal planet for comparative planetology. Briefly describe the properties of our planet and explain them. Include the qualities of the earth’s interior, and how we learn about it, as well as a description of properties that shape and change the earth’s surface (i.e. impact cratering, volcanism, tectonics, erosion). b. Then, examine each planet in our solar system. How does it compare to Earth? What are its unique characteristics? Why do these features exist on that planet, as opposed to Earth? ... click for more

Define the science of astronomy, and compare it with the pseudo-science of astrology.

Define the science of astronomy, and compare it with the pseudo-science of astrology.