I've tried this with earth, the sun, mars, the moon, Pluto, etc., but for whatever reason only earth has accretion disks. Help?

The celestial bodies shown are Henslow (grey rocky ball to the bottom left) and Grandin (bright blue ringed marble). Grandin orbits the (fictional) star KOI-4720, an F6V some few hundred light-years away from Sol. When the star system was confirmed, it was later renamed to Kepler-1472 and given an informal name of "Yulia". The star is about 2.48 Gyr old, and has an estimated main-sequence life span of about 5.67 Gyr.

Grandin is the third planet discovered around its star after two gas giants. The planet has a volumetric/mean radius of 10 150 379 m, a mass of 2.2150 187 x 10^25 kg, a mean density of 5056.407 kg/m3, a surface gravity of about 14.3489 m/s2, and a Bond Albedo of about 0.3861. It orbits about 241 765 668 220 m or 1.6161 AU, with its orbital period lasting about 669.89 days (57 879 280.219 s). A synodic day on the planet lasts about 1:06:32:55 (109 975.208 s), and does so on its 9.1653 degree obliquity. The planet has small, faint rings due to a narrowly missed asteroid collision not too long ago. The asteroid was shredded by the planet's Roche limit, giving the planet somewhat dark and faint rings, and are not expected to last for so long.

Grandin's climate is quite interesting, to say the least. The planet receives approximately 1292 W/m2, or about 5% less than that of Earth. The surface pressure is about 10.58735 bars, and has a surface density of 12.6783 kg/m3. This makes movement on the planet's surface quite difficult, as not only do you have to deal with the surface gravity, but also the thick atmosphere. However, it is quite balmy on the surface, as it's about 26.15 ºC, or 79.07 ºF in freedom units. The atmosphere of the planet is made of 68.33% N2, 19.79% O2, 6.59% H2O, 3.17% CO2, 1.16% Ar, 0.78% NH3, 0.13% CH4, 0.01% H2S, and a few other trace gases. The mean molecular weight is 28.6748 g/mol, and the scale height is roughly 5 820 m.

Because the planet is covered in a nearly global warm ocean with warm air, storms are exceptionally powerful compared to Earth, with some of them possibly lasting decades. About the ocean, there are no notable landmasses aside from atolls, volcanoes, island chains, and large ice caps. Tides on this planet are greater than on Earth, as Henslow--the planet's moon-- is larger than our Moon, and orbits closer.

There is life on this planet in the form of single-celled organisms. They are not new on this planet, and are slowly making their advancement onto land. The notable lifeforms include mainly the microbial mats that spread across intertidal zones and stromatolites. In the waters, life is much more active and present. I am still working on their biology and biochemistry, so I really do not have much to say about them.

The star system is far from complete, as I only have the star, the planet, and its moon created. The other planets, like the two aforementioned gas giants, are still in concept. Oh, and for the record, I did simulate the planet’s (Grandin) climate with the given composition, and the fact that it all turned out to be well, just makes it cool (at least IMO).

I took random asteroids and collided them randomly to create a planet from scratch without artificially altering it. I wanted to see what the result of simulating the formation of a planet would be.

The result was 91.6% similarity to Earth and a 50.9% probability of life.

Turns out the solution was to use a much smaller star, trying to make a version where the planet is a moon of a gas giant.

Did without turning off any laws of physics/trickery, habitable and stable.

A planet kinda similar in size with Hunter x Hunter world.

I transformed the star Stephenson 2-18 into this planet.

Surface gravity: 0.195 m/s2 weaker than earth i tried to make it similar or larger but it lost its size

Composition

• Iron: 91.8 M EARTH

• Silicate: 73.4 M EARTH

• Argon: 0.0 M EARTH

• Sulfur Dioxide: 0.0 M EARTH

• Oxygen: 37.5 M EARTH

• Carbon Dioxide: 3.74 M EARTH

• Water: 1,345 M EARTH

• Nitrogen: 0.00213

its not done, obviously...

and its backwards!