R.E.A.L. Science Odyssey, particularly the Earth & Astronomy packet. I decided to give it a try and we are using just the Astronomy units this summer. I made two booklets for each set of older sister and younger brother; to work together as teams. I like this because it makes my first grade and kindergarten boys feel like they are participating with their older sisters' big kid work. Back to why it intrigued me. We love reading and just naturally creating as we go along, but I also know that my kids were wanting some more structured type labs/experiments, if you will. I thought this would be a nice short and prepared way of having some notebooking style pages and activities to do as we read our way through some picture books and both H. A. Rey The Stars & Find the Constellations as well as my sons favorite: A Child's Introduction to the Night Sky.
We just started reading about the moon and look forward to gazing and tracking the different moon phases soon. Kris at At Home Science has a yahoo group and just linked to this great planet size comparison site that my kids enjoyed so much. I'm sure will follow the R.E.A.L. Science Odyssey plans this summer (it's saved me time putting things together) and use what we like; the kids can't wait to get to the Make A Solar Oven lab soon. I'm also hoping that the night sky gazing will become an ongoing appreciation and observation through out the year.