Put five planets in size order, then see them redrawn at their real sizes side by side. Knowing something is bigger and knowing how much bigger are two different things.
Put the eight planets in order out from the Sun. Each planet you place moves to where it really is, and the gaps open up.
Six places on the Moon, most of them findable with your own eyes, each drawn at the phase where it is easiest to see — because that is the night to look.
Four things from the sky; three share something and one does not. Say which is the odd one out, then say what the other three have in common.
Algol, the Andromeda Galaxy (M31), the Beehive Cluster (Praesepe), Bode’s Galaxy (M81), Callisto, Cassini, Centaurus A (NGC 5128), Deimos, the Dumbbell Nebula, the Eagle Nebula, Earth, Enceladus and 39 more
What is the least you need to see a planet, a nebula or a galaxy: your eyes, binoculars, or a 150 mm telescope? The things you could go and look for, and the answer for each one.
Algol, the Andromeda Galaxy (M31), the Beehive Cluster (Praesepe), Bode’s Galaxy (M81), Callisto, Centaurus A (NGC 5128), the Dumbbell Nebula, the Eagle Nebula, Europa, the galactic bar and bulge, Ganymede, the Helix Nebula and 27 more
Which worlds have ground under them and which have none at all. Rock, ice, or nothing to stand on — nineteen places, and what is really underfoot.
One jump is the Earth’s distance from the Sun. Mars is one and a half, Neptune is thirty.
Perl gives two clues about what is wrong with the Hubble telescope and you work out which fault it is. All five really happened, and were really mended.
The mirror is the wrong shape; the part that feels which way it is turning has worn out; the wings flex as they go from cold to hot; the computer that runs the instruments has stopped; one camera’s power supply has failed
One picture, four names. Planets and moons drawn the same way, in the same light, so what tells them apart is the world itself — and every answer says what gave it away.
More games are on ObserveTheSky, for when you want the arithmetic: Put the planet where it belongs; Which is hotter?; Which is more massive?; How long does a world take to turn once?; Name the constellation; Draw the constellation; Which constellation is it in?; Where will Jupiter’s moons be tomorrow?; How heavy would you feel?; Something is wrong with your telescope; Fifteen places on the Moon.
Put the planets in size order
Put the planets in order from the Sun
What is on the Moon?
Which one does not belong?
Eyes, binoculars, or telescope?
Could you stand on a planet or moon?
Name the planet or moon
More games are on ObserveTheSky, for when you want the arithmetic: