Science Fact File Grade 8 | Chapter # 11, The Universe | Test Yourself Q/A

Science Fact File Grade 8 | Chapter # 11, The Universe | Test Yourself Q/A 00:00 Answer Buddy Intro 00:12 Test Yourself, Page # 177 00:32 Test Yourself, Page # 179 00:52 Test Yourself, Page # 180 01:12 Test Yourself, Page # 181 01:33 Test Yourself, Page # 184 02:02 Test Yourself, Page # 186 Questions covered in this video: What is a galaxy? Explain how a galaxy is held together? What is Sagittarius A* ? How massive is it? How are galaxies classified? Give two ways in which spiral galaxies and elliptical galaxies are: a) similar b) different Explain the difference between a cluster and a supercluster of galaxies. What is Nebula? What is nuclear fusion? What causes the nuclear fusion to stop during the life of a star? What is black hole? What determines whether or not a red giant star becomes a white dwarf or a black hole? Explain why some neutron stars become pulsars? Suggest how pulsars got their name. At what stage in its life cycle is the Sun at present time? How long will it be before the Sun will begin to die? Explain why the Sun will not explode in a supernova? Suggest why our Sun will not remain as a white dwarf star indefinitely? Explain why the stars and planets in the night sky appear to move in circles. What is the difference between an ancient optical telescope and a modern one? How are radio telescopes different from optical ones? Give one big advantage that the Hubble Space Telescope has over Earth-based telescopes. How have computers helped astronomers? Where did Magellan fly to? How long was its flight? What did it find out? What are the two ways spacecraft or space probes gather information from planets? How did Galileo's mission to Jupiter end? Explain why the mission ended? Odyssey was named after the film "2001: A Space Odyssey." Suggest a reason for this. What evidence is there that there was once life on Mars? When was this found? How has exploration of space developed since 1957? Name one planet where advanced robotics are currently in use. What are advantages of carrying out experiments in space? Suggest how space exploration might have contributed to the invention of cordless power tools.