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D.4 Stellar processes Type 1a Supernovae Type 2 Supernovae Formation Core produced when mass from a companion star accretes onto a white dwarf, forcing it to exceed the chandrasekhor limit (1.4M~sun~) EP吸不住，吸过来的东西立刻进行fusion Produced when a massive red ...

Further Cosmology Rotation curve & Dark mattar Rotation curve $$ \frac{GMm}{r^2}=\frac{mv^2}{r} $$ $$ v=\sqrt{\frac{GM}{r}} $$ $$ M=\rho v=\rho\cdot\frac{4}{3}\pi r^3 $$ $$ v=\sqrt{\frac{4}{3}\pi G\rho}\cdot r $$ 在这里插图片(写上公式)<=但这个只是理论，真实的是持平的（还要放observed和the...

Fundamental SI units Fundamental units Quantity SI unit Symbol Mass Kilogram kg Distance Meter m Time Second s Electric current Ampere A Particle Mole mol Temperature Kelvin K Luminous intensity Candela cd Derived units Derived Unit M...

2.1 Motion Distance and displacement Distane Displacement scalar vector The length of the shortest straight line between two different point The distance moved from the initial position to the end point |s| s Speed and Velocity Speed Velocit...

3.1 Thermal concepts Temperature and absolute temperature There have two commonly used measurment of temperature, one is Celsius(摄氏度) and the other one is Kelvin（开氏度） The temperature difference between them is same ${\Delta K}={\Delta C}$ Absolute zero is 0K ...

4.1 Oscillations Oscillation and simple harmonic oscillations Oscillation Oscillations are periodic motions which center around an equilibrium position and repeat the motion. Period ($T$) means the time taken to complete one full oscillation. Amplitude measur...