This is a very simple hands-on activity to show the expansion of the Universe. It uses dots on a balloon to show that the observed recession velocity of galaxies can be explained by the expansion of the Universe as a whole.

This is a very simple hands-on activity to show why a small body, like the Moon, can cover a much larger object, like the Sun. The apparent size of an object depends on the its real size and the distance it is from us. In the case of the Sun and the Moon, their sizes and distances are such, that their apparent size on the sky is very similar. That is why Total Solar Eclipses exist.

This is a very simple hands-on activity to show why stars twinkle. A small hole on a cardboard, a light source and a heat source in a darkened room, are all that is needed to simulate the effect of the earth atmosphere on the observation of the stars.

This is a very simple hands-on activity to show why the stars are not visible during the day. Turning the lights on in a darkened room, where you were using a torchlight and a cardboard with several small holes, to simulate stars in the night sky, will make the stars disappear.