Your grandchildren may not have any reason to get into astronomy:

http://www.thespacereview.com/article/713/1

To quote:

Andrew Fraknoi, of the Foothill College & Astronomical Society of the Pacific, spoke about the changing attitude toward the study of astronomy in American education. At one time astronomy was a requirement in American schools. This was part of the “mental discipline” model of education, which was based on the belief that study of subjects like Latin, Greek, and astronomy was good for training students how to think, even if they would not later use the knowledge in their lives. However, American science education transformed into the study of biology, chemistry, and physics. Astronomy became a subset of physics, often ignored completely. Now, with the “No Child Left Behind” act, there is no room for astronomy in American schools because astronomy is not included in standardized tests that teachers must prepare their students to take.