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Y9SciPhyTopic3
Year 9 Science Physics Topic 3 Waves and the Universe
| Question | Answer |
|---|---|
| Star | A large ball of gas that produces heat and light energy from fusion reactions. |
| Naked eye | Observation made by using just the eyes without telescopes or any other aid. |
| Nebula | A cloud of gas in space. Some objects that look like nebulae are actually clusters of stars or other galaxies. Plural is nebulae. |
| Milky Way | The name of our galaxy. |
| Solar System | The Sun and planets that go around it. |
| Galaxy | A group of millions of stars held together by gravity. |
| Universe | All the stars galaxies and space itself. |
| Spectrometer | An object that can split up light to show the colours of the spectrum. |
| Visible light | Electromagnetic waves that can be detected by the human eye. |
| Electromagnetic spectrum | The entire frequency range of electromagnetic waves |
| Space probes | A space vehicle that can be put into orbit around a planet or moon or parachuted down through the atmosphere. |
| Rovers | A space vehicle that can move around on a planet or moon. |
| Lander | A space vehicle that lands on a planet or moon. |
| Search for ExtraTerrestrial Intelligence (SETI) | Looking for intelligence life beyond the Earth by trying to detect radio signals from them. |
| Dense | Something which has a lot of mass in a given volume. |
| Protostar | A cloud of gas drawn together by gravity that has not yet started to produce its own energy. |
| Nuclei | Plural of-the central part of an atom containing protons and neutrons. The control centre of a cell. |
| Fusion reactions | When the nuclei of two atoms join together and release energy. |
| Main sequence star | A star during the main part of its life cycle where it is using hydrogen fuel. |
| Stable | Something that stays the same without changing. |
| Red giant star | A star that has used up all the hydrogen in its core and is now using helium as fuel. It is bigger than a normal star. |
| White dwarf star | A very dense star that is not very bright. A red giant turns into a white dwarf. |
| Red supergiants | A star that has used up all the hydrogen in its core and has a mass much higher than the Sun. |
| Supernova | An explosion produced when the core of a red supergiant collapses plural is supernovae |
| Black hole | Core of a red supergiant that has collapsed. Black holes are formed if the remaining core has a mass core of more than three or four times the mass of the Sun. |
| Neutron star | Core of a red supergiant that has collapsed. |
| Red-shift | Waves emitted by by something moving away from an observer have their wavelength increased and frequency decreased compared to waves from a stationary object. |
| Big Bang theory | The theory that says that the Universe began from a tiny point with huge energy and has been expanding ever since. |
| Steady State theory | The theory that the Universe is expanding but new matter is continually being created so the Universe will always appear the same. |
| Cosmic Microwave Background (CMB) radiation | Microwave radiation received from all over the sky originating at the Big Bang. |
| Pitch | Whether a sound is low or high. |
| Doppler Effect | The change in the pitch of a sound coming from a moving source. |
| Sound wave | Transverse seismic waves that travel through the earth. |
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