The shape of Earth’s orbit around the sun is ______________________. A ______________________ is any object that orbits a larger object or planet. A ______________________ is a naturally occurring satellite. An _____________________ is a small rocky object that orbits a star. A ______________________ is a small object composed of frozen gases, ice, rock and dust that can glow and produce a tail. A ______________________ ______________________ is composed of a star and all the objects moving around it.
A ______________________ is a collection of many millions of stars. ______________________ is a force generated by all objects that attracts all other objects.
Knowledge & Understanding Compare the following space objects: (a) Planets and dwarf planets (b) Asteroids and comets (c) The moon and a telecommunications satellite Describe our solar system by answering the following: (a) What is at the centre of our solar system? (b) How many planets are in our solar system and where are they located? (c) What other space objects are found in our solar system and in what parts of the solar system are they found? Describe the Big Bang theory in your own words. Do you think it is a good explanation of the origins of our universe?
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Thinking & Investigating When was the Big Bang theory first developed? Who were the scientists involved in the initial development of the Big Bang theory? Describe the contribution that each of these scientists made to the development of the theory.
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4. Outline the evidence that supports the theory of the Big Bang.
