![]() The equilibrium depends on the gravitation which can collapse the star and the radiation pressure which can make the star expand. The stability of a star depends on the equilibrium between two opposing forces. Stellar clusters: A group of stars gravitationally bounded together. Planetary nebula: The ejected envelope of a red giant star. Planetary system: Gravitationally bounded non-stellar objects in orbit around a star or star system. Planet: A celestial body that orbits a star. Nebula: A cloud of dust, hydrogen, helium and other ionized gases. Neutron stars: A very dense star, consisting only of uncharged neutrons. Main sequence star: A normal star that is undergoing nuclear fusion of hydrogen into helium. Galaxies: stars, gas, and dust held together by gravitational forces. Its existence is inferred from theoretical physics rather than direct visual contact. The luminosity can be determined from the period and along with the apparent brightness can be used to determine the distance of the star from Earth.Ĭlusters of galaxies: Two or more galaxies that are close enough to each other to affect each other through gravitation.Ĭonstellation: A pattern of stars visible from Earth that are not gravitational bounded.ĭark matter: Matter in galaxies that are too cold to radiate. Single star: A luminous sphere of plasma held together by its own gravity.īinary star: Two stars orbiting a common center.Ĭepheid variable: A star with a period of varying luminosity. Without the sharps, it is a different pattern and, therefore, not a Major scale.However, the solar system in which we live in is merely a speck of dust in the vast universe. This image shows that the key of D Major follows this same pattern. Notice that the pattern changes, which means that this is no longer a Major scale. Here's what it would look like without the B flatted. The B is flatted so that the scale follows the same W W H W W W H pattern. The key of F, for example, has 1 flat (B flat). The key of C has no sharps or flats because it naturally follows this pattern. In the last lesson, we discussed that the W W H W W W H step pattern is the same for all major keys. Whole & Half Step Pattern in a Major Scale Let's discuss what all of these key signatures have in common. This little trick will help you quickly determine the name of the key signature when there are multiple sharps or flats in the key signature, but you may have noticed that this trick doesn't work for the key of F or the key of C. In this case, there is already a C# in the key signature, so this key is the key of C#. The quicker way to determine this is to look at the sharps already in the key signature. This means that half step above B# is C#. Remember that there is a naturally occurring half step between B and C, which means B# is the same pitch as C. Why? The last sharp in this key signature is B#. It is not the key of E# because there is no E# in this key signature. This is the key of E because E is half step above D#, which is the last sharp in the key signature. This is the key of G because F# is the last sharp in the key signature. Sharpsįor key signatures with sharps, the key signature is the note name half step above the last sharp. It is not the key of D because there is a D flat in the key. This is the key of D flat because D flat is the second to last flat in the key signature. This is the key of E flat because E flat is the second to last flat in the key signature. Here is a list of all of the different key signatures:įor key signatures with flats, the key signature is the second to last flat.
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