This was an experiment this year. I had students take regular index cards and draw a picture of each of the planets and sun on the the blank side and list five facts on the back. They then taped them together at the seam (do not overlap the seams or they won't fold accordian style). They put a blank index card at the front and end when they were done and that got taped (use double sided tape - not glue because it causes buckling) to a larger index card on both ends. One became their title page the other just got taped to the book. I used velco dots (sold in the sewing section of Walmart) to hold the accordian book closed. The kids loved it (what is not to love when noise making velco was involved?!?). It took longer then I thought and I might scale it down next time.
This can be used for any type of timeline or a mini project. It wasn't too bulky in the book (11 cards used total).