What two things did Walker learn while she was completing her PhD? How did this impact her studies? Why was one of these things unfortunate? How would you feel if you were in her shoes? Explain. What is the visible spectrum? What are the two problems with using visible light to explore the sky? Explain the technique known as radio astronomy. Describe and explain what can be seen by using the Parkes Radio Telescope, affectionately known as "The Dish." Be sure to explain what synchrotron radiation is. Why is the Murchison Radio Observatory such an ideal place to build radio telescopes? Explain. When Walker decides that she wants to explore beyond the Milky Way, what does she find? How many radio galaxies can be seen in the image that Walker shares? Describe these galaxies and what they look like in the image? After learning about Walker and her love of and exploration of galaxies, what questions do you still have? What do you want to know more about?