Space Facts Postcards
Two postcard designs for a 101 pack of space facts postcards.
Postcard 1: A day on Venus is longer than a year on Venus. It takes Venus 243 Earth years to do a full rotation on its axis (a day), but 225 Earth days to do an orbit of the sun (a year).
Postcard 2: Comets are space snowballs, composed of frozen water and gases, rock and dust.