10.12.2007 – Astronomy Mass: p 2 = [4π 2 / G(M+m)] * a 3 ≈ [4π 2 / GM] * a3 p 2 ~ a 3 /M M ~ a 3 /p 2 for homework, look at parallax problems. Theta/360 = d/2piD R = pi/360 * thetaD Rotation period: observable Density: tells a lot about what a planet is made of
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