Interplay of potential energy of gravity and conservation of angular momentum- a simulation of a decaying orbit. Fun with every coin saved!
We process orders on weekdays (except holidays). Orders will be acknowledged within 2 working days of receipt and shipped within 3 working days of receipt.
Our average shipping times:
8-15 Business Days to the USA after fulfillment
10-20 Business Days to countries outside the USA after fulfillment
Reviewed by 1 user
The item came in a smashed box, and product have a big crack …. My son was very sad to receive it