Is this planet possible in real life?

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Doing a simple density calculation, I get $ρ = \frac{0.09 M_{\oplus}}{\frac{4}{3} π R^{3}} \approx 15.97 {grams/cm}^{3}$ For comparison, here's a list of the average densities, $\bar{ρ}$ , of the planets in the Solar System: $\begin{array}{ccc} Planet & \bar{ρ} {(g/cm)}^{3} \\ Mercury & 5.4 \\ Venus & 5.2 \\ Earth & 5.5 \\ Mars & 3.9 \\ Jupiter & 1.3 \\ Saturn & 0.7 \\ Uranus & 1.3 \\ Neptune & 1.6 \end{array}$ This means that your planet would have a density much greater than any of the planets in the Solar System. I looked up some mass-radius curves from Seager et al. (2008). Your planet is fairly low-mass, and so it's possible that their models fail in that regime, but your world ( $0.09 M_{\oplus}$ $0.315 R_{\oplus}$ , still falls on the pure iron track.

posted about 9 years ago

HDE 226868‭

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Is this planet possible in real life?

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