This document discusses different types of celestial objects including dwarf planets, comets, and asteroids. Dwarf planets are made of ice and dust and orbit the sun, examples include Pluto, Eris, and Ceres. Comets are mixtures of ice and frozen gases and dust that can orbit planets or land on them, collecting scientific information. The document also mentions Claudius Ptolemy, an ancient astronomer who believed the Earth was the center of the universe, and Galileo Galilei, an early astronomer who built a telescope and used it to discover Jupiter's moons, concluding the Sun is at the center of the solar system rather than the Earth.

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2.  The path an object takes around another object.

3. Dwarf planetsComet Asteroids

4.  Mixture of ice (water and frozen gases ) and
dust.

5.  Rocks that evolve around the sun.

6.  Example: Pluto , Eris and ceres.

7.  They travel to other planets to collect scientific
information.
 Some orbits around planets ,some land on
them.

8.  Claudius Ptolemy is a Greco-Egyptian
astronomer.
 Ptolemy said that the earth is the centre of the
universe and the sun, planets, stars and moon
moved around it.

9.  Is an Italian astronomer.
 Galilei built the telescope and examined the
skies with it.
 He discovered the 4 main satellites of jupiter
and he came up with the conclusion that the
sun is the centre of the universe not the earth.