What type of galaxy is shown?
- elliptical
- irregular
- normal spiral
- barred spiral

Along the line connecting the two charges, at what distance from the charge q1 is the total electric field from the two charges zero? express your answer in terms of some or all of the variables s, q1, q2 and k =14ï€ïµ0. if your answer is difficult to enter, consider simplifying it, as it can be made relatively simple with some work.

If two parallel light rays hit a mirror, they will not be parallel to each other after they reflect.

Could we see a galaxy that is 20 billion light-years away?