1. What type of astrophysical object is imaged? 2. Where do you see the higher energy phenomena? What are they? Are they visible in any image? Why? 3. Where are the young stars? What colour do they have? Are they visible in any image? Why?

For a human eye with a pupil diameter (aperture diameter D) of 0.005 meters, and a focal length of 0.022 meters, there will be a resolution limit due to diffraction at 0.6 microns (10^-6 meters) wavelength. If we space light-sensitive cells on the retina at this spacing, how many retina cells per meter (of retina) are there? cells/meter. Now suppose there are giants which are exactly twice the size of humans in each dimension. So giant eyes have pupils of 0.01 meters, and a focal length of 0.044 meters. How many retina cells per meter should the giants have? cells/meter

In order to observe emissions from celestial bodies Very Long Baseline Arrays (VLBA) have been developed. Explain why VLBA use multiple telescopes separated by long distances in terms of the wave nature of light. Include in your answer specific physics terminology, associated relevant equations, and a labelled diagram.

what three astronomical objects are represented on this excerpted Image 1 from a postage stamp? What are the two rings?