Latest research from Tokyo Institute of Technology and Tsinghua University
The researchers Shigeru Ida (Tokyo Tech) and Feng Tian (Tsinghua), ran computer simulations of planetary formation based on best-current planetary models to find the likely numbers of earth-like planets forming around various types of stars. Here are the stats:
*For 1000 stars 30 percent the mass of our sun (the approximate mass of M dwarf stars), 5,000 exoplanets with Earth-like masses formed. However, only 55 of those planets formed within the stars’ habitable zones and only 1 formed with the “perfect” Earth-like water:land ratio. 31 habitable zone planets turned into “dune worlds” and 23 turned into “water worlds.”
* For 1,000 stars 50 percent the mass of our sun, 75,000 exoplanets formed and 9,000 of them had Earth-like masses. 292 of those worlds formed inside the habitable zone and 12 were truly Earth-like.
*For 1,000 sun-like stars, 38,000 exoplanets formed, 8,000 of them of Earth-mass. Although this may be a lower number, 407 formed inside the habitable zone and 271 of those formed with just the right water:land ratio, making sun-like stars the most likely place to form Earth-like exoplanets.
SUMMARY: Drastically different numbers of Earth-like planets according to star-type!
Red dwarves : Only 1 Earth-like planet per 1000 stars 50% Solar Mass: 12 Earth-like planets per 1000 stars 1 Solar Mass: 271 Earth-like planets per 1000 stars
I wonder if Space Engine will be revised to incorporate the latest data about planetary formation. It would appear that updating Space Engine to take into account this information would require recreating an entirely new 'universe' from scratch each time.
Edited by zarzuelazen - Saturday, 13.06.2015, 07:57
That still gives us 5 to 9 planets with earthlike masses per star, which seems rather fishy. if those calculations were correct that would make ours a rather unusual system with only two earthlike planets. I'm also a bit suspicious of the land/water ratio. The land/water ration on Earth has increased though geologic history and would have been lower when life first emerged, though I am not sure by how much.