Here is a telescope that helps you get your children interested in astronomy. The Elecom Smartphone Telescope is easy to put together and combines with your smartphone to let you observe the moon and stars. Assembling the telescope is easy. The lens offers a 35-magnification optical zoom. Combined with your phone, you get a max magnification of 140x.
The telescope works with smartphones up to 6″ screens. It weighs around 220g.