Constellations are the arrangement of groups of stars in a pattern. These can be visible during night Few constellations are easily recognisable, like Saptarishi or small bear.

The planets which are very far from the sun and rarge in size are called outer planets. These are made-up of gases and liquids. The examples of  outer planets are Jupiter, Saturn, Uranus and Neptune.

The collection of millions of galaxies is called the universe and it is difficult to imagine the size of the universe.

The plants and animals require oxygen and water to survive while to grow they require proper nutrition.

(i) Mars has two satellites.
(ii) There are eight planets in above picture.

Many words we use in Geography have originated from Greek or Roman words. 'Geo' or 'Ge' are Greek words meaning Earth.
Some of the words originated from 'geo' or 'ge' are as follows.
Geo + graphia = 'Geography' meaning description of the Earth.
Geo-i- metry = 'Geometry' meaning measurement of the Earth.
Geo + logy = 'Geology' meaning study of the Earth.
Geo+ oid = 'Geoid' meaning the shape that resembles with the Earth.
Geo-r grapher = 'Geographer' meaning one who studies geography.

Satellite is a celestial body that moves around the planet in the same way as the planets move around the sun, A satellite may be artificial or natural.
Some of the planets have different number of satellites, Saturn has maximum number of satellites Artificial satellites are sent in the orbit of the Earth through rocket.
Planets move around the sun in fixed path (orbit). These paths are elongated, The various planets take different time to complete a round of sun depending upon the distance of particular planet from the sun.