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The Universe Y10-SS2

Chapter 7 Pearson Places section 2

QuestionAnswer
Absolute magnitude A measure of how bright a star would appear if it was 10 pc away.
Apparent magnitude A measure of the brightness of a star as it appears to an observer on Earth.
Blue supergiants Stars that are 10 or more times more massive than the sun.
Black Dwarf Cold dark remains of a white dwarf.
Density Mass per unit of volume of a material.
Electromagnetic spectrum Different types of electromagnetic radiation ranging from radio waves to gamma waves.
Gamma waves Very high energy electromagnetic rays.
Isotope Atoms with the same number of protons but different number of neutrons.
Magnitude A measure of the brightness of a star.
Main sequence A group of stars lying on a line running from the top left to the bottom right of the H-R Diagram.
Neutrino An almost mass-less, neutral particle released during some nuclear reactions.
Neutron star Remnant of a supernova, consisting entirely of neutrons.
Plasma State of matter consisting of positively charged ions and free electrons.
Positron A positively charged electron.
Planetary nebula A cloud of gas produced when a red giant runs out of fuel.
Red Giant A star produced when the core of a sun-sized star runs on hydrogen.
Singularity Also called a black hole.
Spectral class A classification system for stars based on their colour.
Spectrometer A device that splits light into a spectrum to show its component wavelengths.
Supernova A giant explosion that occurs when a star many times larger than our sun runs out of nuclear fuel.
White dwarf Hot, dense star that is the remains of a red giant.
Created by: Hard04