California Institute of Technology, Massachusetts Institute of Technology, Harvard University, University of California at Berkeley, Princeton University, University of Arizona, University of Chicago and other astronomy related majors. They are all very famous, and the overall astronomical ranking in the world is very high. Caltech and MIT are the most impressive.
Imperial College London seems to be good at astronomy and aerospace.
It is also said that the members of astronomical research societies in foreign universities are all better.
I can see that you are interested in that subdivision direction. However, foreign schools, especially comprehensive universities, pay more attention to general education and emphasize the integration of arts and sciences. There is little difference in professional education at the undergraduate level, but there is a serious difference in the subdivision direction of learning and research. Well, science and engineering schools tend to have more science and engineering. Each has its own advantages and disadvantages, depending on your personal choice.
See which sky you are interested in. The mainstream is going to Britain and America. After all, talents and equipment resources are gathered. But some people who love Nantian will go to Australia and other places.
Different schools have different research focuses, and each school has its own unique concept and campus atmosphere.
You can make a detailed comparison after collecting information on some websites. Or query the national or world rankings of astronomy related majors in recent years. (Astronomy-related majors in some less well-known schools are also ranked in the top, with certain reliability, but it is hard to say about teaching quality, research attention and funds. )
Everyone has their own comparison in mind, and everyone has their own favorite. The scope of this "good" is too vague. You still need to judge for yourself.