Lesson
Lesson-18.1.3- understand why gravitational field strength, g, varies and know that it is different on other planets and the Moon from that on the Earth.
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Lesson-18.1.2- know that: ??? the universe is a large collection of billions of galaxies ??? a galaxy is a large collection of billions of stars ??? our solar system is in the Milky Way galaxy.PreviousLesson-18.1.4- explain that gravitational force: ??? causes moons to orbit planets ??? causes the planets to orbit the Sun ??? causes artificial satellites to orbit the Earth ??? causes comets to orbit the Sun.Next