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Year 9 Science Physics Topic 3 Waves and the Universe

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.
Created by: bookcase
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