Folks, keep in mind exoplanet studies continue and continue to show challenges to the MMSN for our solar system, example how gas giants form. Here is a newer report. Small Jupiter-like planets hint we need to rethink how gas giants form,
, “Two Jupiter-like planets that orbit a young star are much smaller than expected, which may suggest we need to rethink our ideas of the early evolution of gas giant planets."
NASA ADS Abstract, Rapid contraction of giant planets orbiting the 20 million-years old star V1298 Tau, https://ui.adsabs.harvard.edu/abs/2021arXiv211109193S/abstract
, November 2021. “Current theories of planetary evolution predict that infant giant planets have large radii and very low densities before they slowly contract to reach their final size after about several hundred million years. These theoretical expectations remain untested to date, despite the increasing number of exoplanetary discoveries, as the detection and characterisation of very young planets is extremely challenging due to the intense stellar activity of their host stars..."
My observation. The 47-page arXiv paper (https://arxiv.org/pdf/2111.09193.pdf
) “Table 2: Planetary parameters for the V1298 Tau system” shows V 1298 Tau b orbital period 24.1399 days, a=0.1719 au, e=0.134. Mass = 0.64 Mjup, radius = 0.868 Rjup. The distance to V 1298 Tau is 108.5 pc and the star mass reported is 1.17 solar masses and 20 million years old age. Using my calculations, V 1298 Tau b orbital period = 2.4061E+01 days or 24.06 days, very close to the published 24.1399-day period. In the postulated 20 million years age reported, the exoplanet could complete 3.0360E+08 revolutions around the parent star or more than 300 million revolutions. Applying the MMSN to the postulated protoplanetary disk that the exoplanets reported at V1298 Tau evolved from, total dust and gas mass = 3.895626E+03 earth masses, or nearly 3900 earth masses. V 1298 Tau is a 4-exoplanet system with a companion star, HD 284154. The arXiv paper reports, “2.1 Membership to Group 29. V1298 Tau is the low-mass companion of the warmer, G0-type star HD 284154 at a projected separation of 97.7 arcsec (or 10600 AU at the distance of the system). The pair belongs to the recently identified Group 29,12 which is a young, sparse association of coeval stars in the Taurus 16 region, all of which share very similar proper motions and distances based on the Tycho-Gaia astrometric catalog (TGAS).46, 47.”
Some of the gas giants at V 1298 Tau, challenge current evolutionary models on how gas giant planets form. Science continues to work on showing How Gas Clouds Evolve into People but with struggles ongoing