The Revolving Planets | Grade 5 | Unit 4 - Concept 1 - Lesson 5 | Science

شرح ساينس الصف الخامس الابتدائي لغات - الفصل الدراسي الثاني
شرح ساينس خامسة ابتدائي - ترم ثاني
لينك تحميل الملزمة
drive.google.com/file/d/1BU6a...
لينك تليجرام
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In This Lesson:
► Our solar system consists of the Sun and a group of planets revolve around it.
► In 1543, a scientist called Nicolaus Copernicus stated that Earth revolves around the Sun.
► In the solar system, each planet revolves around the Sun in a fixed path called an orbit.
► The orbit of each planet has an ellipse (oval) shape.
► Earth revolves around the Sun at a speed nearly equals 107000 km per hour.
But, what keeps the planets revolve around the Sun in fixed orbits?
► Gravity is the invisible attraction or pulling force that holds all the planets in their places.
► The great gravitational pulling force of the Sun keeps the planets revolving in fixed orbits.
► If there were no gravity, the planets would fly off into space.
بالتوفيق
مستر احمد الباشا