🌌 Stone's Star System Generator

Planet 1 - Terrestrial

Semi-Major Axis: 0.51 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 3.01

Radius: 1.55

Gravity: 1.25 G

Time & Orbit

Eccentricity (e): 0.06

Orbit Range: 0.48 AU - 0.54 AU

Year: 235 Days

Day: 40.7 Hours

Environment

Temp: -113 °C

Axial Tilt: 5.7 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Satellites (1)

Outer Limit: 43,058,447 km

• M1: 293,810 km (0.104 R)

Planet 2 - Terrestrial

Semi-Major Axis: 0.65 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 4.19

Radius: 1.77

Gravity: 1.34 G

Time & Orbit

Eccentricity (e): 0.125

Orbit Range: 0.57 AU - 0.73 AU

Year: 338 Days

Day: 20 Hours

Environment

Temp: -141 °C

Axial Tilt: 33.3 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Planet 3 - Gas Giant

Semi-Major Axis: 0.92 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 878.3

Radius: 11.8

Gravity: 6.31 G

Time & Orbit

Eccentricity (e): 0.07

Orbit Range: 0.86 AU - 0.98 AU

Year: 570 Days

Day: 11.3 Hours

Environment

Temp: -150 °C

Axial Tilt: 26.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (45)

Outer Limit: 43,058,447 km

• M1: 151,243 km (0.068 R)
• M2: 263,442 km (0.042 R)
• M3: 400,473 km (0.098 R)
• M4: 594,951 km (0.03 R)
• M5: 705,204 km (0.091 R)
• M6: 813,214 km (0.113 R)
• M7: 890,257 km (0.081 R)
• M8: 1,030,580 km (0.105 R)
• M9: 1,137,991 km (0.091 R)
• M10: 1,261,409 km (0.059 R)
• M11: 1,515,875 km (0.118 R)
• M12: 1,600,248 km (0.113 R)
• M13: 1,686,118 km (0.034 R)
• M14: 1,766,900 km (0.109 R)
• M15: 1,960,630 km (0.118 R)
• M16: 2,117,857 km (0.049 R)
• M17: 2,234,992 km (0.087 R)
• M18: 2,309,342 km (0.108 R)
• M19: 2,422,438 km (0.085 R)
• M20: 2,537,329 km (0.098 R)
• M21: 2,741,082 km (0.05 R)
• M22: 2,974,754 km (0.069 R)
• M23: 3,114,927 km (0.112 R)
• M24: 3,240,290 km (0.108 R)
• M25: 3,350,544 km (0.119 R)
• M26: 3,436,113 km (0.049 R)
• M27: 3,600,671 km (0.027 R)
• M28: 3,732,616 km (0.085 R)
• M29: 3,812,502 km (0.069 R)
• M30: 4,119,626 km (0.098 R)
• M31: 4,406,854 km (0.093 R)
• M32: 4,481,952 km (0.105 R)
• M33: 4,567,073 km (0.064 R)
• M34: 4,719,663 km (0.098 R)
• M35: 5,079,147 km (0.09 R)
• M36: 5,630,116 km (0.092 R)
• M37: 5,742,613 km (0.107 R)
• M38: 5,824,892 km (0.069 R)
• M39: 5,917,942 km (0.119 R)
• M40: 6,042,856 km (0.109 R)
• M41: 6,476,092 km (0.091 R)
• M42: 6,583,204 km (0.1 R)
• M43: 7,106,198 km (0.108 R)
• M44: 7,227,971 km (0.111 R)
• M45: 7,328,052 km (0.092 R)

Planet 4 - Gas Giant

Semi-Major Axis: 1.71 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 577.2

Radius: 11.3

Gravity: 4.52 G

Time & Orbit

Eccentricity (e): 0.061

Orbit Range: 1.61 AU - 1.81 AU

Year: 1444 Days

Day: 13.9 Hours

Environment

Temp: -189 °C

Axial Tilt: 6.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (51)

Outer Limit: 43,058,447 km

• M1: 154,684 km (0.12 R)
• M2: 239,057 km (0.054 R)
• M3: 373,546 km (0.031 R)
• M4: 467,643 km (0.078 R)
• M5: 571,763 km (0.053 R)
• M6: 717,920 km (0.094 R)
• M7: 885,021 km (0.113 R)
• M8: 973,733 km (0.106 R)
• M9: 1,152,801 km (0.046 R)
• M10: 1,225,955 km (0.111 R)
• M11: 1,464,114 km (0.092 R)
• M12: 1,607,130 km (0.068 R)
• M13: 1,878,500 km (0.11 R)
• M14: 2,433,658 km (0.112 R)
• M15: 2,680,495 km (0.052 R)
• M16: 2,823,809 km (0.12 R)
• M17: 2,946,928 km (0.039 R)
• M18: 3,245,526 km (0.078 R)
• M19: 3,614,285 km (0.112 R)
• M20: 3,711,673 km (0.068 R)
• M21: 4,021,640 km (0.086 R)
• M22: 4,224,644 km (0.081 R)
• M23: 4,667,154 km (0.067 R)
• M24: 5,015,568 km (0.086 R)
• M25: 5,151,851 km (0.118 R)
• M26: 5,624,431 km (0.078 R)
• M27: 5,823,247 km (0.072 R)
• M28: 6,111,223 km (0.112 R)
• M29: 6,330,234 km (0.088 R)
• M30: 6,836,323 km (0.06 R)
• M31: 7,247,568 km (0.068 R)
• M32: 7,479,594 km (0.088 R)
• M33: 7,682,748 km (0.115 R)
• M34: 8,190,334 km (0.04 R)
• M35: 8,513,166 km (0.078 R)
• M36: 8,627,160 km (0.09 R)
• M37: 8,708,840 km (0.084 R)
• M38: 8,823,731 km (0.113 R)
• M39: 8,922,615 km (0.093 R)
• M40: 9,005,193 km (0.105 R)
• M41: 9,171,397 km (0.109 R)
• M42: 9,321,743 km (0.061 R)
• M43: 9,845,933 km (0.093 R)
• M44: 10,137,500 km (0.061 R)
• M45: 10,501,771 km (0.09 R)
• M46: 10,659,147 km (0.092 R)
• M47: 10,870,230 km (0.031 R)
• M48: 11,296,434 km (0.094 R)
• M49: 11,529,657 km (0.067 R)
• M50: 11,837,081 km (0.093 R)
• M51: 12,238,901 km (0.114 R)

Planet 5 - Gas Giant

Semi-Major Axis: 2.15 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 889

Radius: 13.8

Gravity: 4.67 G

Time & Orbit

Eccentricity (e): 0.167

Orbit Range: 1.79 AU - 2.51 AU

Year: 2036 Days

Day: 5.2 Hours

Environment

Temp: -182 °C

Axial Tilt: 36.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (62)

Outer Limit: 43,058,447 km

• M1: 274,213 km (0.114 R)
• M2: 428,448 km (0.103 R)
• M3: 569,519 km (0.045 R)
• M4: 763,996 km (0.105 R)
• M5: 1,130,511 km (0.113 R)
• M6: 1,449,903 km (0.115 R)
• M7: 1,970,653 km (0.097 R)
• M8: 2,371,425 km (0.064 R)
• M9: 2,533,739 km (0.084 R)
• M10: 2,630,080 km (0.115 R)
• M11: 2,798,378 km (0.066 R)
• M12: 2,970,266 km (0.097 R)
• M13: 3,086,802 km (0.113 R)
• M14: 3,190,175 km (0.075 R)
• M15: 3,369,991 km (0.106 R)
• M16: 3,677,415 km (0.095 R)
• M17: 4,010,270 km (0.066 R)
• M18: 4,188,441 km (0.105 R)
• M19: 4,303,332 km (0.103 R)
• M20: 4,569,766 km (0.115 R)
• M21: 4,807,477 km (0.094 R)
• M22: 4,893,496 km (0.076 R)
• M23: 5,384,027 km (0.114 R)
• M24: 5,599,299 km (0.111 R)
• M25: 6,093,869 km (0.032 R)
• M26: 6,393,663 km (0.088 R)
• M27: 6,698,394 km (0.068 R)
• M28: 6,813,884 km (0.094 R)
• M29: 7,223,483 km (0.058 R)
• M30: 7,401,504 km (0.09 R)
• M31: 7,721,644 km (0.109 R)
• M32: 8,087,261 km (0.095 R)
• M33: 8,231,024 km (0.036 R)
• M34: 8,835,549 km (0.032 R)
• M35: 9,218,071 km (0.114 R)
• M36: 9,541,053 km (0.088 R)
• M37: 9,649,511 km (0.081 R)
• M38: 10,220,377 km (0.094 R)
• M39: 10,375,809 km (0.078 R)
• M40: 10,487,409 km (0.076 R)
• M41: 10,577,018 km (0.113 R)
• M42: 10,666,927 km (0.109 R)
• M43: 11,579,174 km (0.114 R)
• M44: 11,718,300 km (0.027 R)
• M45: 11,857,875 km (0.062 R)
• M46: 12,279,891 km (0.082 R)
• M47: 12,564,127 km (0.049 R)
• M48: 12,659,271 km (0.069 R)
• M49: 12,994,370 km (0.034 R)
• M50: 13,163,117 km (0.048 R)
• M51: 13,356,696 km (0.109 R)
• M52: 13,600,092 km (0.047 R)
• M53: 14,190,256 km (0.042 R)
• M54: 14,289,589 km (0.114 R)
• M55: 14,538,519 km (0.081 R)
• M56: 15,167,279 km (0.118 R)
• M57: 15,345,002 km (0.064 R)
• M58: 15,779,284 km (0.098 R)
• M59: 16,217,756 km (0.061 R)
• M60: 16,634,086 km (0.096 R)
• M61: 16,738,655 km (0.114 R)
• M62: 17,450,741 km (0.069 R)

Planet 6 - Gas Giant

Semi-Major Axis: 4.45 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 737

Radius: 11.4

Gravity: 5.67 G

Time & Orbit

Eccentricity (e): 0.101

Orbit Range: 4 AU - 4.9 AU

Year: 6061 Days

Day: 10.6 Hours

Environment

Temp: -213 °C

Axial Tilt: 45.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (84)

Outer Limit: 43,058,447 km

• M1: 158,125 km (0.099 R)
• M2: 271,969 km (0.119 R)
• M3: 422,016 km (0.039 R)
• M4: 510,278 km (0.076 R)
• M5: 847,023 km (0.079 R)
• M6: 964,457 km (0.114 R)
• M7: 1,183,918 km (0.118 R)
• M8: 1,333,815 km (0.098 R)
• M9: 1,419,983 km (0.077 R)
• M10: 1,841,101 km (0.09 R)
• M11: 1,937,891 km (0.12 R)
• M12: 2,238,583 km (0.074 R)
• M13: 2,383,992 km (0.11 R)
• M14: 2,706,674 km (0.111 R)
• M15: 3,205,134 km (0.094 R)
• M16: 3,322,569 km (0.055 R)
• M17: 4,133,090 km (0.1 R)
• M18: 4,312,757 km (0.118 R)
• M19: 4,547,476 km (0.118 R)
• M20: 4,894,244 km (0.089 R)
• M21: 5,332,715 km (0.108 R)
• M22: 6,276,977 km (0.077 R)
• M23: 7,427,385 km (0.041 R)
• M24: 7,835,936 km (0.063 R)
• M25: 8,155,178 km (0.086 R)
• M26: 8,381,221 km (0.079 R)
• M27: 8,543,983 km (0.065 R)
• M28: 9,474,482 km (0.105 R)
• M29: 9,644,126 km (0.116 R)
• M30: 9,848,925 km (0.111 R)
• M31: 9,951,849 km (0.11 R)
• M32: 10,055,221 km (0.099 R)
• M33: 10,158,892 km (0.088 R)
• M34: 10,263,012 km (0.089 R)
• M35: 10,577,168 km (0.08 R)
• M36: 10,965,674 km (0.094 R)
• M37: 11,539,082 km (0.098 R)
• M38: 11,902,306 km (0.081 R)
• M39: 13,014,865 km (0.108 R)
• M40: 13,355,200 km (0.1 R)
• M41: 13,583,636 km (0.115 R)
• M42: 14,981,479 km (0.074 R)
• M43: 15,219,040 km (0.098 R)
• M44: 15,298,477 km (0.097 R)
• M45: 15,377,913 km (0.096 R)
• M46: 15,497,591 km (0.081 R)
• M47: 15,617,419 km (0.102 R)
• M48: 15,898,514 km (0.093 R)
• M49: 16,751,521 km (0.099 R)
• M50: 17,953,988 km (0.107 R)
• M51: 19,355,870 km (0.109 R)
• M52: 19,528,207 km (0.03 R)
• M53: 19,787,610 km (0.12 R)
• M54: 20,748,776 km (0.075 R)
• M55: 20,836,889 km (0.048 R)
• M56: 20,925,152 km (0.063 R)
• M57: 21,057,695 km (0.085 R)
• M58: 21,146,257 km (0.117 R)
• M59: 21,591,012 km (0.109 R)
• M60: 21,904,120 km (0.064 R)
• M61: 22,263,903 km (0.066 R)
• M62: 23,034,631 km (0.118 R)
• M63: 24,416,317 km (0.113 R)
• M64: 24,695,916 km (0.092 R)
• M65: 25,211,131 km (0.109 R)
• M66: 25,399,474 km (0.1 R)
• M67: 25,682,663 km (0.091 R)
• M68: 25,824,632 km (0.102 R)
• M69: 26,730,297 km (0.081 R)
• M70: 27,259,275 km (0.119 R)
• M71: 28,181,247 km (0.111 R)
• M72: 29,212,126 km (0.092 R)
• M73: 29,459,411 km (0.072 R)
• M74: 29,657,628 km (0.095 R)
• M75: 29,806,628 km (0.076 R)
• M76: 30,907,219 km (0.117 R)
• M77: 31,665,082 km (0.094 R)
• M78: 31,970,112 km (0.041 R)
• M79: 32,429,228 km (0.082 R)
• M80: 33,354,192 km (0.076 R)
• M81: 33,612,547 km (0.079 R)
• M82: 33,716,219 km (0.113 R)
• M83: 34,339,892 km (0.117 R)
• M84: 35,177,341 km (0.078 R)

Planet 7 - Ice Giant

Semi-Major Axis: 6.31 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 218.1

Radius: 3.1

Gravity: 22.7 G

Time & Orbit

Eccentricity (e): 0.233

Orbit Range: 4.84 AU - 7.78 AU

Year: 10234 Days

Day: 21.1 Hours

Environment

Temp: -229 °C

Axial Tilt: 35.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (96)

Outer Limit: 43,058,447 km

• M1: 46,974 km (0.113 R)
• M2: 87,814 km (0.092 R)
• M3: 185,801 km (0.067 R)
• M4: 246,687 km (0.029 R)
• M5: 304,132 km (0.047 R)
• M6: 420,968 km (0.092 R)
• M7: 627,264 km (0.089 R)
• M8: 747,989 km (0.112 R)
• M9: 920,027 km (0.118 R)
• M10: 1,120,189 km (0.113 R)
• M11: 1,184,366 km (0.049 R)
• M12: 1,453,343 km (0.08 R)
• M13: 1,759,121 km (0.038 R)
• M14: 2,064,600 km (0.073 R)
• M15: 2,448,319 km (0.079 R)
• M16: 2,680,495 km (0.067 R)
• M17: 3,008,114 km (0.108 R)
• M18: 3,302,373 km (0.06 R)
• M19: 3,348,449 km (0.096 R)
• M20: 3,488,024 km (0.107 R)
• M21: 3,700,752 km (0.07 R)
• M22: 3,796,794 km (0.086 R)
• M23: 4,015,656 km (0.064 R)
• M24: 4,213,723 km (0.059 R)
• M25: 4,465,646 km (0.099 R)
• M26: 5,331,219 km (0.106 R)
• M27: 5,631,013 km (0.062 R)
• M28: 5,686,215 km (0.119 R)
• M29: 5,769,092 km (0.082 R)
• M30: 5,880,393 km (0.097 R)
• M31: 5,908,368 km (0.11 R)
• M32: 5,964,318 km (0.105 R)
• M33: 6,275,481 km (0.089 R)
• M34: 6,447,369 km (0.1 R)
• M35: 6,737,290 km (0.079 R)
• M36: 6,795,782 km (0.06 R)
• M37: 6,883,896 km (0.094 R)
• M38: 7,571,597 km (0.053 R)
• M39: 7,908,192 km (0.105 R)
• M40: 8,156,076 km (0.112 R)
• M41: 8,218,458 km (0.066 R)
• M42: 8,375,087 km (0.087 R)
• M43: 9,960,974 km (0.11 R)
• M44: 10,329,434 km (0.114 R)
• M45: 10,702,531 km (0.098 R)
• M46: 11,218,195 km (0.071 R)
• M47: 11,357,022 km (0.061 R)
• M48: 11,496,447 km (0.109 R)
• M49: 11,671,626 km (0.104 R)
• M50: 13,360,137 km (0.108 R)
• M51: 13,396,938 km (0.091 R)
• M52: 13,507,341 km (0.064 R)
• M53: 13,914,846 km (0.086 R)
• M54: 13,952,096 km (0.081 R)
• M55: 14,064,145 km (0.12 R)
• M56: 14,288,841 km (0.032 R)
• M57: 14,552,731 km (0.076 R)
• M58: 14,628,278 km (0.113 R)
• M59: 14,932,261 km (0.115 R)
• M60: 15,046,853 km (0.104 R)
• M61: 15,469,168 km (0.058 R)
• M62: 15,973,462 km (0.046 R)
• M63: 16,129,642 km (0.051 R)
• M64: 16,522,337 km (0.116 R)
• M65: 17,277,357 km (0.104 R)
• M66: 17,800,351 km (0.087 R)
• M67: 17,921,675 km (0.058 R)
• M68: 18,165,370 km (0.111 R)
• M69: 18,491,942 km (0.047 R)
• M70: 19,233,948 km (0.093 R)
• M71: 19,483,327 km (0.113 R)
• M72: 21,002,494 km (0.115 R)
• M73: 21,259,353 km (0.09 R)
• M74: 21,862,831 km (0.081 R)
• M75: 22,428,162 km (0.098 R)
• M76: 22,866,334 km (0.057 R)
• M77: 23,130,524 km (0.072 R)
• M78: 23,263,067 km (0.097 R)
• M79: 23,617,614 km (0.064 R)
• M80: 25,053,754 km (0.12 R)
• M81: 25,645,114 km (0.118 R)
• M82: 26,241,112 km (0.043 R)
• M83: 26,610,170 km (0.115 R)
• M84: 27,727,666 km (0.069 R)
• M85: 28,292,099 km (0.112 R)
• M86: 29,432,184 km (0.042 R)
• M87: 29,815,604 km (0.096 R)
• M88: 29,863,625 km (0.055 R)
• M89: 29,959,816 km (0.111 R)
• M90: 30,056,007 km (0.089 R)
• M91: 30,878,496 km (0.097 R)
• M92: 31,219,280 km (0.072 R)
• M93: 31,365,587 km (0.11 R)
• M94: 31,708,166 km (0.106 R)
• M95: 32,594,683 km (0.118 R)
• M96: 33,240,048 km (0.092 R)

Planet 8 - Ice Giant

Semi-Major Axis: 11.02 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 89

Radius: 5.8

Gravity: 2.65 G

Time & Orbit

Eccentricity (e): 0.196

Orbit Range: 8.86 AU - 13.18 AU

Year: 23620 Days

Day: 16.2 Hours

Environment

Temp: -224 °C

Axial Tilt: 18 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (74)

Outer Limit: 43,058,447 km

• M1: 73,453 km (0.108 R)
• M2: 378,034 km (0.063 R)
• M3: 552,764 km (0.092 R)
• M4: 719,715 km (0.099 R)
• M5: 902,674 km (0.113 R)
• M6: 1,026,690 km (0.103 R)
• M7: 1,099,993 km (0.069 R)
• M8: 1,213,538 km (0.062 R)
• M9: 2,348,088 km (0.116 R)
• M10: 2,695,305 km (0.049 R)
• M11: 3,464,986 km (0.104 R)
• M12: 3,604,112 km (0.109 R)
• M13: 4,238,407 km (0.1 R)
• M14: 4,782,794 km (0.12 R)
• M15: 5,094,705 km (0.103 R)
• M16: 5,284,994 km (0.104 R)
• M17: 5,349,021 km (0.104 R)
• M18: 6,271,292 km (0.07 R)
• M19: 7,065,059 km (0.059 R)
• M20: 7,206,279 km (0.039 R)
• M21: 8,221,001 km (0.053 R)
• M22: 8,295,202 km (0.078 R)
• M23: 9,241,408 km (0.094 R)
• M24: 10,141,539 km (0.115 R)
• M25: 10,461,230 km (0.107 R)
• M26: 11,028,505 km (0.109 R)
• M27: 11,814,492 km (0.043 R)
• M28: 13,178,376 km (0.025 R)
• M29: 14,322,799 km (0.078 R)
• M30: 14,367,380 km (0.093 R)
• M31: 14,546,448 km (0.055 R)
• M32: 14,636,207 km (0.096 R)
• M33: 14,997,336 km (0.118 R)
• M34: 15,452,862 km (0.12 R)
• M35: 15,774,347 km (0.08 R)
• M36: 15,866,649 km (0.071 R)
• M37: 16,424,051 km (0.094 R)
• M38: 16,470,875 km (0.089 R)
• M39: 16,940,612 km (0.078 R)
• M40: 17,082,431 km (0.061 R)
• M41: 19,010,748 km (0.07 R)
• M42: 19,652,074 km (0.059 R)
• M43: 20,100,269 km (0.051 R)
• M44: 20,300,581 km (0.105 R)
• M45: 20,652,734 km (0.113 R)
• M46: 21,669,700 km (0.111 R)
• M47: 21,823,637 km (0.037 R)
• M48: 24,070,148 km (0.111 R)
• M49: 24,870,945 km (0.112 R)
• M50: 24,978,356 km (0.112 R)
• M51: 25,193,628 km (0.078 R)
• M52: 25,680,419 km (0.117 R)
• M53: 25,897,785 km (0.092 R)
• M54: 27,435,950 km (0.088 R)
• M55: 28,272,202 km (0.055 R)
• M56: 28,890,790 km (0.098 R)
• M57: 29,230,078 km (0.12 R)
• M58: 30,255,721 km (0.107 R)
• M59: 30,485,204 km (0.116 R)
• M60: 32,812,199 km (0.094 R)
• M61: 33,877,784 km (0.071 R)
• M62: 35,255,880 km (0.11 R)
• M63: 36,286,160 km (0.079 R)
• M64: 36,347,196 km (0.1 R)
• M65: 36,835,633 km (0.084 R)
• M66: 38,066,525 km (0.107 R)
• M67: 38,314,259 km (0.048 R)
• M68: 39,623,988 km (0.093 R)
• M69: 40,000,825 km (0.118 R)
• M70: 40,821,519 km (0.106 R)
• M71: 40,884,948 km (0.095 R)
• M72: 41,075,087 km (0.11 R)
• M73: 41,647,748 km (0.099 R)
• M74: 42,415,335 km (0.112 R)

Kuiper Belt

Range: 30 - 46 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 534 - 15,807 AU

Composition

Type: Cometary Reservoir

System's final boundary, containing trillions of icy planetesimals.

Gravitational Limit