T=(2.9*10^6 k*m)/λmax
L (luminosity)= θ (constant)*T^4*4π(R)^2
Kepler’s first law means that planets move around the Sun in elliptical orbits. An ellipse is a shape that resembles a flattened circle. How much the circle is flattened is expressed by its eccentricity. The eccentricity is a number between 0 and 1. It is zero for a perfect circle.
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