Question

Find the odd one out in the following groups and give reasons for your answers.
(a) Cassiopeia, Milky Way, Orion, Ursa Major
(b) Sun, Proxima Centauri, Polaris, Mercury
(c) Moon, Mars, Saturn, Neptune

Answer 1

(a) Milky Way
Here, the Milky Way is the galaxy that contains our solar system; all the others fall under the category of constellations.

(b) Mercury
Mercury is a planet of our solar system; all the others are stars.

(c) Moon
The moon is the only natural satellite of the earth; all the others are planets of our solar system.