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| Questão | Responda |
| What is nuclear fission? | Nuclear fission is the splitting of a nucleus into two approximately equal fragments and the release of two or three neutrons. |
| When does a chain reaction occur? | A chain reaction occurs in a nuclear reactor when each fission event causes further fission events. |
| What is nuclear fusion? | Nuclear fusion is the process of forcing two nuclei close enough together so they form a single larger nucleus. |
| How can nuclei be made to fuse together? | Nuclear fusion can be brought about by making two light nuclei collide at very high speed. |
| Where does the Sun's energy come from? | Energy is released when two light nuclei are fused together. Nuclear fusion in the Sun's core releases energy. |
| Why is it difficult to make a nuclear fusion type? | A fusion reactor need to be at very high temperature before nuclear fusion can take place. The nuclei to be fused are difficult t contain. |
| What is radon gas and why is it dangerous? | Radon gas is an a-emitting isotope that seeps(flows) into houses in certain areas through the ground. |
| How safe are the nuclear reactors? | There are thousands of fission reactors safely in use in the world. |
| How safe are the nuclear? | Nuclear waste is stored in safe and secure conditions for many years after unused uranium and plutonium(to be used in the future) is removed form it. |
| What is a galaxy? | A galaxy is a collection of billions of stars held together by their own gravity. |
| What was the universe like in the billions of years before stars and galaxies were formed? | The universe was a dark patchy could of hydrogen and helium. |
| What is the force responsible for the formation of stars and galaxies? | The force of gravity pulled matter into galaxies and stars. |
| What is a prostate? | It is a gas and dust cloud in space that can go on to form a star. |
| What are the stages in the life for low mass star? | Protostar->main sequence star->red giant->white dwarf->black dwarf |
| What are the stages in the life for high mass star? | Protostar->main sequence star->red supergiant->supernova->neutron star->black hole if sufficient mass |
| What will happen eventually to the Sun? | The Sun will eventually become a black dwarf. |
| What is a supernova? | A supernova is the explosion of a supergiant after it collapses. |
| What chemical elements are formed inside stars? | Elements as heavy as iron are formed inside stars as a results if nuclear fusion. |
| What chemical elements are formed in supernovas? | Elements heavier than iron are formed in supernovas as well as light elements. |
| Why does the Earth contain heavy elements? | The Sun and the rest of the Solar System were formed form the debris of supernova. |
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