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" ... Earth's Gravity according to the Preliminary Reference Earth Model (PREM). The acceleration has its... [+] maximum at 0.5463 Earth radii (~ 3481 km, i.e. 2890 km below the surface) and a value of 10.66 m/s². This is due to the varying densities of the different layers of Earth, including gradual differences within individual layers. ... "
" ... Sure, there will be outliers: planets of very high or low-density, planets very very close to their parent star, planets that has thick atmospheres that later boiled away, and planets that have migrated to new positions in their orbit. But when we measure the masses and radii of the planets out there, we expect that there should only be a few major classes. ... "
" ... These initial categories, unfortunately, were biased by our own expectations, and didn’t necessarily represent anything that was physically real other than our preconceived prejudices. Since we began detecting exoplanets directly some 30 years ago, we’ve catalogued more than 4,000 of them, learning unprecedented information about their masses, radii, and where in orbit around their parent star they form. ... "