🌌 Stone's Star System Generator

Planet 1 - Terrestrial

Semi-Major Axis: 1.14 AU

Status: HZ

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 1.03

Radius: 1.01

Gravity: 1.01 G

Time & Orbit

Eccentricity (e): 0.126

Orbit Range: 1 AU - 1.28 AU

Year: 449 Days

Day: 32.5 Hours

Environment

Temp: 7 °C

Axial Tilt: 4.4 °

Atmosphere: N₂, O₂

Biome: Oceanic/Continental

Planet 2 - Terrestrial

Semi-Major Axis: 1.7 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 2.35

Radius: 1.41

Gravity: 1.18 G

Time & Orbit

Eccentricity (e): 0.199

Orbit Range: 1.36 AU - 2.04 AU

Year: 818 Days

Day: 14.2 Hours

Environment

Temp: -63 °C

Axial Tilt: 2.8 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Planet 3 - Terrestrial

Semi-Major Axis: 2.61 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 1.78

Radius: 1.26

Gravity: 1.12 G

Time & Orbit

Eccentricity (e): 0.079

Orbit Range: 2.4 AU - 2.82 AU

Year: 1556 Days

Day: 36.3 Hours

Environment

Temp: -93 °C

Axial Tilt: 28.1 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Planet 4 - Terrestrial

Semi-Major Axis: 3.2 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 4.59

Radius: 1.84

Gravity: 1.36 G

Time & Orbit

Eccentricity (e): 0.052

Orbit Range: 3.03 AU - 3.37 AU

Year: 2112 Days

Day: 25.6 Hours

Environment

Temp: -103 °C

Axial Tilt: 19.5 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Planet 5 - Gas Giant

Semi-Major Axis: 5.44 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 236.1

Radius: 11.7

Gravity: 1.72 G

Time & Orbit

Eccentricity (e): 0.13

Orbit Range: 4.73 AU - 6.15 AU

Year: 4681 Days

Day: 13.7 Hours

Environment

Temp: -144 °C

Axial Tilt: 0.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (57)

Outer Limit: 96,869,165 km

• M1: 148,850 km (0.044 R)
• M2: 260,599 km (0.114 R)
• M3: 397,930 km (0.099 R)
• M4: 534,214 km (0.103 R)
• M5: 652,845 km (0.08 R)
• M6: 772,075 km (0.098 R)
• M7: 1,420,881 km (0.101 R)
• M8: 1,772,286 km (0.114 R)
• M9: 2,481,230 km (0.057 R)
• M10: 2,720,736 km (0.046 R)
• M11: 2,812,440 km (0.115 R)
• M12: 2,983,430 km (0.058 R)
• M13: 3,872,640 km (0.087 R)
• M14: 5,272,876 km (0.114 R)
• M15: 5,407,365 km (0.091 R)
• M16: 5,504,154 km (0.112 R)
• M17: 5,719,127 km (0.029 R)
• M18: 6,137,253 km (0.112 R)
• M19: 6,483,123 km (0.12 R)
• M20: 6,751,950 km (0.066 R)
• M21: 6,856,220 km (0.079 R)
• M22: 6,940,144 km (0.106 R)
• M23: 7,172,620 km (0.072 R)
• M24: 7,558,582 km (0.111 R)
• M25: 7,688,732 km (0.098 R)
• M26: 7,973,417 km (0.066 R)
• M27: 8,172,532 km (0.096 R)
• M28: 8,553,109 km (0.109 R)
• M29: 8,643,466 km (0.078 R)
• M30: 9,031,373 km (0.094 R)
• M31: 9,541,651 km (0.109 R)
• M32: 10,085,290 km (0.11 R)
• M33: 10,542,012 km (0.063 R)
• M34: 11,030,001 km (0.044 R)
• M35: 12,053,549 km (0.077 R)
• M36: 12,154,977 km (0.048 R)
• M37: 12,718,362 km (0.115 R)
• M38: 13,552,819 km (0.089 R)
• M39: 14,030,036 km (0.064 R)
• M40: 14,217,183 km (0.056 R)
• M41: 14,297,517 km (0.11 R)
• M42: 14,864,942 km (0.078 R)
• M43: 15,137,659 km (0.097 R)
• M44: 16,329,206 km (0.115 R)
• M45: 16,639,023 km (0.12 R)
• M46: 16,808,667 km (0.07 R)
• M47: 17,149,900 km (0.116 R)
• M48: 17,493,377 km (0.115 R)
• M49: 18,012,930 km (0.097 R)
• M50: 18,187,361 km (0.097 R)
• M51: 18,274,726 km (0.086 R)
• M52: 18,362,241 km (0.102 R)
• M53: 19,334,029 km (0.104 R)
• M54: 19,452,959 km (0.098 R)
• M55: 19,631,878 km (0.064 R)
• M56: 19,871,085 km (0.078 R)
• M57: 20,111,489 km (0.12 R)

Planet 6 - Gas Giant

Semi-Major Axis: 8.37 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 226.7

Radius: 14.3

Gravity: 1.11 G

Time & Orbit

Eccentricity (e): 0.105

Orbit Range: 7.49 AU - 9.25 AU

Year: 8934 Days

Day: 6 Hours

Environment

Temp: -174 °C

Axial Tilt: 7.8 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (70)

Outer Limit: 96,869,165 km

• M1: 245,640 km (0.081 R)
• M2: 530,025 km (0.091 R)
• M3: 627,264 km (0.108 R)
• M4: 768,634 km (0.088 R)
• M5: 922,271 km (0.091 R)
• M6: 1,339,350 km (0.118 R)
• M7: 1,496,876 km (0.096 R)
• M8: 1,611,169 km (0.048 R)
• M9: 1,936,544 km (0.096 R)
• M10: 2,080,009 km (0.084 R)
• M11: 2,302,311 km (0.094 R)
• M12: 2,435,603 km (0.111 R)
• M13: 2,532,542 km (0.109 R)
• M14: 2,630,679 km (0.088 R)
• M15: 2,831,140 km (0.054 R)
• M16: 2,995,249 km (0.047 R)
• M17: 3,141,555 km (0.104 R)
• M18: 3,268,863 km (0.081 R)
• M19: 3,572,696 km (0.118 R)
• M20: 3,885,954 km (0.076 R)
• M21: 4,444,104 km (0.108 R)
• M22: 4,587,568 km (0.111 R)
• M23: 4,757,063 km (0.085 R)
• M24: 4,903,968 km (0.1 R)
• M25: 5,202,416 km (0.097 R)
• M26: 6,240,026 km (0.073 R)
• M27: 6,482,375 km (0.074 R)
• M28: 6,672,963 km (0.097 R)
• M29: 6,865,495 km (0.036 R)
• M30: 7,087,798 km (0.086 R)
• M31: 8,264,235 km (0.109 R)
• M32: 8,500,899 km (0.102 R)
• M33: 9,163,468 km (0.088 R)
• M34: 10,346,787 km (0.099 R)
• M35: 10,924,085 km (0.068 R)
• M36: 11,347,597 km (0.101 R)
• M37: 11,577,828 km (0.095 R)
• M38: 12,076,587 km (0.114 R)
• M39: 12,957,868 km (0.108 R)
• M40: 13,510,483 km (0.117 R)
• M41: 13,824,638 km (0.092 R)
• M42: 14,282,857 km (0.099 R)
• M43: 14,424,825 km (0.071 R)
• M44: 15,250,456 km (0.103 R)
• M45: 15,359,363 km (0.07 R)
• M46: 15,833,887 km (0.11 R)
• M47: 17,362,179 km (0.104 R)
• M48: 17,513,872 km (0.11 R)
• M49: 17,780,156 km (0.045 R)
• M50: 18,278,616 km (0.064 R)
• M51: 18,432,851 km (0.107 R)
• M52: 18,742,668 km (0.11 R)
• M53: 19,328,344 km (0.117 R)
• M54: 19,722,086 km (0.044 R)
• M55: 20,437,463 km (0.105 R)
• M56: 21,121,125 km (0.107 R)
• M57: 21,975,778 km (0.077 R)
• M58: 22,510,590 km (0.097 R)
• M59: 23,091,479 km (0.096 R)
• M60: 23,635,117 km (0.105 R)
• M61: 23,761,228 km (0.078 R)
• M62: 23,929,675 km (0.104 R)
• M63: 25,291,614 km (0.045 R)
• M64: 25,722,307 km (0.058 R)
• M65: 26,547,489 km (0.101 R)
• M66: 27,117,157 km (0.105 R)
• M67: 27,646,434 km (0.1 R)
• M68: 28,134,722 km (0.086 R)
• M69: 28,581,122 km (0.119 R)
• M70: 30,025,190 km (0.07 R)

Planet 7 - Ice Giant

Semi-Major Axis: 14.38 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 387.2

Radius: 7.5

Gravity: 6.88 G

Time & Orbit

Eccentricity (e): 0.072

Orbit Range: 13.34 AU - 15.42 AU

Year: 20119 Days

Day: 21.2 Hours

Environment

Temp: -184 °C

Axial Tilt: 45.1 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (91)

Outer Limit: 96,869,165 km

• M1: 95,294 km (0.105 R)
• M2: 156,330 km (0.108 R)
• M3: 454,329 km (0.08 R)
• M4: 579,093 km (0.118 R)
• M5: 756,516 km (0.118 R)
• M6: 1,574,218 km (0.109 R)
• M7: 2,117,707 km (0.109 R)
• M8: 2,394,164 km (0.107 R)
• M9: 2,617,364 km (0.09 R)
• M10: 2,813,936 km (0.111 R)
• M11: 3,503,732 km (0.066 R)
• M12: 4,513,966 km (0.068 R)
• M13: 5,316,559 km (0.062 R)
• M14: 6,206,068 km (0.101 R)
• M15: 6,468,612 km (0.073 R)
• M16: 7,370,089 km (0.047 R)
• M17: 7,788,514 km (0.086 R)
• M18: 7,882,461 km (0.104 R)
• M19: 8,214,569 km (0.117 R)
• M20: 8,697,022 km (0.097 R)
• M21: 10,353,070 km (0.116 R)
• M22: 11,563,616 km (0.074 R)
• M23: 13,152,495 km (0.057 R)
• M24: 13,433,440 km (0.078 R)
• M25: 14,058,161 km (0.071 R)
• M26: 14,172,753 km (0.105 R)
• M27: 15,809,952 km (0.103 R)
• M28: 16,168,388 km (0.06 R)
• M29: 16,772,016 km (0.109 R)
• M30: 17,629,361 km (0.095 R)
• M31: 17,752,929 km (0.119 R)
• M32: 18,001,112 km (0.114 R)
• M33: 18,250,342 km (0.073 R)
• M34: 19,005,063 km (0.095 R)
• M35: 19,258,931 km (0.082 R)
• M36: 19,770,107 km (0.113 R)
• M37: 20,545,024 km (0.066 R)
• M38: 20,675,174 km (0.074 R)
• M39: 21,395,787 km (0.111 R)
• M40: 21,659,827 km (0.087 R)
• M41: 22,257,919 km (0.078 R)
• M42: 22,726,909 km (0.075 R)
• M43: 22,928,866 km (0.082 R)
• M44: 24,221,840 km (0.079 R)
• M45: 24,842,671 km (0.11 R)
• M46: 25,329,014 km (0.039 R)
• M47: 25,538,451 km (0.087 R)
• M48: 26,807,041 km (0.054 R)
• M49: 27,951,913 km (0.115 R)
• M50: 28,168,232 km (0.039 R)
• M51: 28,457,704 km (0.116 R)
• M52: 28,893,632 km (0.05 R)
• M53: 29,625,315 km (0.102 R)
• M54: 29,845,972 km (0.072 R)
• M55: 30,362,982 km (0.107 R)
• M56: 30,808,485 km (0.106 R)
• M57: 31,630,824 km (0.083 R)
• M58: 32,687,883 km (0.11 R)
• M59: 32,915,870 km (0.103 R)
• M60: 33,833,204 km (0.105 R)
• M61: 34,526,740 km (0.105 R)
• M62: 35,693,154 km (0.064 R)
• M63: 36,163,191 km (0.092 R)
• M64: 36,320,418 km (0.101 R)
• M65: 36,556,633 km (0.106 R)
• M66: 38,144,166 km (0.062 R)
• M67: 38,785,342 km (0.096 R)
• M68: 39,026,793 km (0.109 R)
• M69: 40,159,997 km (0.106 R)
• M70: 40,485,672 km (0.084 R)
• M71: 41,879,924 km (0.049 R)
• M72: 42,292,964 km (0.089 R)
• M73: 42,790,377 km (0.117 R)
• M74: 45,391,285 km (0.094 R)
• M75: 45,730,573 km (0.111 R)
• M76: 46,070,609 km (0.062 R)
• M77: 46,667,953 km (0.108 R)
• M78: 47,525,748 km (0.049 R)
• M79: 47,956,440 km (0.093 R)
• M80: 49,867,403 km (0.096 R)
• M81: 50,392,940 km (0.086 R)
• M82: 51,537,663 km (0.075 R)
• M83: 52,246,458 km (0.092 R)
• M84: 54,032,357 km (0.087 R)
• M85: 54,842,579 km (0.087 R)
• M86: 55,929,109 km (0.025 R)
• M87: 58,861,077 km (0.103 R)
• M88: 59,323,634 km (0.082 R)
• M89: 60,252,487 km (0.047 R)
• M90: 61,373,574 km (0.107 R)
• M91: 62,218,802 km (0.104 R)

Planet 8 - Ice Giant

Semi-Major Axis: 17.93 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 605.7

Radius: 6.9

Gravity: 12.72 G

Time & Orbit

Eccentricity (e): 0.132

Orbit Range: 15.56 AU - 20.3 AU

Year: 28012 Days

Day: 22.3 Hours

Environment

Temp: -208 °C

Axial Tilt: 25.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (92)

Outer Limit: 96,869,165 km

• M1: 139,276 km (0.119 R)
• M2: 288,275 km (0.103 R)
• M3: 709,692 km (0.039 R)
• M4: 789,278 km (0.051 R)
• M5: 1,046,288 km (0.06 R)
• M6: 1,495,829 km (0.098 R)
• M7: 1,999,525 km (0.03 R)
• M8: 2,429,619 km (0.113 R)
• M9: 2,930,921 km (0.111 R)
• M10: 3,193,466 km (0.114 R)
• M11: 3,327,505 km (0.096 R)
• M12: 3,694,319 km (0.118 R)
• M13: 3,788,117 km (0.081 R)
• M14: 3,835,241 km (0.033 R)
• M15: 4,566,026 km (0.086 R)
• M16: 4,973,232 km (0.081 R)
• M17: 5,128,963 km (0.079 R)
• M18: 5,713,591 km (0.104 R)
• M19: 6,151,913 km (0.079 R)
• M20: 6,375,263 km (0.092 R)
• M21: 6,544,458 km (0.091 R)
• M22: 6,829,741 km (0.114 R)
• M23: 6,945,081 km (0.11 R)
• M24: 7,531,056 km (0.109 R)
• M25: 7,769,964 km (0.115 R)
• M26: 7,830,102 km (0.103 R)
• M27: 9,318,601 km (0.101 R)
• M28: 9,382,629 km (0.081 R)
• M29: 9,704,264 km (0.089 R)
• M30: 10,292,334 km (0.103 R)
• M31: 10,358,456 km (0.074 R)
• M32: 10,424,578 km (0.086 R)
• M33: 10,959,241 km (0.043 R)
• M34: 11,777,990 km (0.075 R)
• M35: 11,985,781 km (0.116 R)
• M36: 14,571,730 km (0.107 R)
• M37: 15,698,352 km (0.107 R)
• M38: 15,774,347 km (0.059 R)
• M39: 16,156,720 km (0.044 R)
• M40: 16,233,613 km (0.105 R)
• M41: 16,387,549 km (0.093 R)
• M42: 16,542,084 km (0.03 R)
• M43: 18,353,564 km (0.115 R)
• M44: 19,404,938 km (0.095 R)
• M45: 21,228,387 km (0.071 R)
• M46: 21,565,730 km (0.116 R)
• M47: 22,160,531 km (0.081 R)
• M48: 23,279,074 km (0.093 R)
• M49: 24,152,127 km (0.087 R)
• M50: 25,035,802 km (0.068 R)
• M51: 25,571,063 km (0.056 R)
• M52: 26,110,064 km (0.069 R)
• M53: 26,925,672 km (0.081 R)
• M54: 27,016,777 km (0.076 R)
• M55: 29,141,067 km (0.063 R)
• M56: 29,422,161 km (0.041 R)
• M57: 29,515,959 km (0.09 R)
• M58: 30,745,504 km (0.104 R)
• M59: 31,031,535 km (0.056 R)
• M60: 33,842,330 km (0.112 R)
• M61: 35,028,940 km (0.085 R)
• M62: 39,185,068 km (0.093 R)
• M63: 40,013,990 km (0.12 R)
• M64: 40,118,110 km (0.056 R)
• M65: 41,268,218 km (0.098 R)
• M66: 42,323,332 km (0.106 R)
• M67: 43,601,047 km (0.074 R)
• M68: 50,064,573 km (0.083 R)
• M69: 51,076,453 km (0.091 R)
• M70: 52,436,148 km (0.098 R)
• M71: 53,120,558 km (0.109 R)
• M72: 53,578,328 km (0.098 R)
• M73: 56,819,814 km (0.098 R)
• M74: 58,110,545 km (0.073 R)
• M75: 60,720,878 km (0.03 R)
• M76: 64,097,900 km (0.107 R)
• M77: 65,809,151 km (0.081 R)
• M78: 68,653,006 km (0.089 R)
• M79: 69,901,999 km (0.084 R)
• M80: 70,152,575 km (0.102 R)
• M81: 74,587,853 km (0.04 R)
• M82: 74,972,170 km (0.072 R)
• M83: 76,387,066 km (0.099 R)
• M84: 76,516,169 km (0.072 R)
• M85: 77,810,789 km (0.094 R)
• M86: 78,591,092 km (0.097 R)
• M87: 79,373,937 km (0.1 R)
• M88: 81,474,292 km (0.075 R)
• M89: 82,928,832 km (0.077 R)
• M90: 84,391,899 km (0.053 R)
• M91: 86,939,102 km (0.102 R)
• M92: 89,375,453 km (0.049 R)

Planet 9 - Ice Giant

Semi-Major Axis: 19.65 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 547.4

Radius: 4.3

Gravity: 29.61 G

Time & Orbit

Eccentricity (e): 0.224

Orbit Range: 15.25 AU - 24.05 AU

Year: 32138 Days

Day: 15.3 Hours

Environment

Temp: -199 °C

Axial Tilt: 1.8 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (92)

Outer Limit: 96,869,165 km

• M1: 56,548 km (0.117 R)
• M2: 150,346 km (0.053 R)
• M3: 249,380 km (0.072 R)
• M4: 1,071,570 km (0.066 R)
• M5: 2,244,118 km (0.061 R)
• M6: 2,711,162 km (0.117 R)
• M7: 3,115,076 km (0.113 R)
• M8: 3,585,562 km (0.074 R)
• M9: 4,696,625 km (0.108 R)
• M10: 5,016,765 km (0.101 R)
• M11: 5,179,377 km (0.095 R)
• M12: 5,790,784 km (0.073 R)
• M13: 5,904,478 km (0.062 R)
• M14: 6,366,287 km (0.058 R)
• M15: 6,779,776 km (0.051 R)
• M16: 7,080,467 km (0.09 R)
• M17: 7,201,941 km (0.104 R)
• M18: 7,262,977 km (0.066 R)
• M19: 7,570,550 km (0.104 R)
• M20: 8,008,423 km (0.117 R)
• M21: 9,370,511 km (0.111 R)
• M22: 9,705,162 km (0.054 R)
• M23: 11,866,103 km (0.08 R)
• M24: 12,300,984 km (0.065 R)
• M25: 13,939,230 km (0.105 R)
• M26: 15,408,431 km (0.117 R)
• M27: 15,882,507 km (0.065 R)
• M28: 15,961,943 km (0.116 R)
• M29: 17,991,388 km (0.092 R)
• M30: 18,406,821 km (0.11 R)
• M31: 19,672,419 km (0.074 R)
• M32: 20,272,456 km (0.101 R)
• M33: 22,197,332 km (0.07 R)
• M34: 22,553,525 km (0.096 R)
• M35: 23,181,387 km (0.112 R)
• M36: 23,271,594 km (0.112 R)
• M37: 26,030,329 km (0.03 R)
• M38: 27,352,624 km (0.092 R)
• M39: 29,571,909 km (0.04 R)
• M40: 30,357,298 km (0.067 R)
• M41: 32,149,330 km (0.119 R)
• M42: 32,451,369 km (0.112 R)
• M43: 32,552,197 km (0.111 R)
• M44: 32,956,710 km (0.039 R)
• M45: 33,464,744 km (0.106 R)
• M46: 35,730,703 km (0.064 R)
• M47: 36,882,009 km (0.027 R)
• M48: 37,409,341 km (0.103 R)
• M49: 39,221,121 km (0.114 R)
• M50: 39,436,093 km (0.103 R)
• M51: 40,516,938 km (0.084 R)
• M52: 41,388,644 km (0.119 R)
• M53: 42,486,992 km (0.077 R)
• M54: 42,707,799 km (0.067 R)
• M55: 42,929,054 km (0.119 R)
• M56: 44,488,013 km (0.098 R)
• M57: 46,065,523 km (0.099 R)
• M58: 49,043,418 km (0.09 R)
• M59: 50,672,389 km (0.112 R)
• M60: 51,023,795 km (0.099 R)
• M61: 52,911,420 km (0.103 R)
• M62: 53,030,201 km (0.115 R)
• M63: 56,876,362 km (0.111 R)
• M64: 57,485,375 km (0.057 R)
• M65: 57,607,447 km (0.117 R)
• M66: 59,078,892 km (0.057 R)
• M67: 59,819,252 km (0.038 R)
• M68: 60,562,753 km (0.098 R)
• M69: 61,184,632 km (0.114 R)
• M70: 62,434,671 km (0.071 R)
• M71: 63,314,756 km (0.105 R)
• M72: 64,706,016 km (0.099 R)
• M73: 65,469,115 km (0.115 R)
• M74: 68,034,269 km (0.088 R)
• M75: 68,680,682 km (0.085 R)
• M76: 70,370,838 km (0.058 R)
• M77: 70,762,785 km (0.11 R)
• M78: 71,155,629 km (0.072 R)
• M79: 74,988,925 km (0.077 R)
• M80: 75,255,658 km (0.103 R)
• M81: 77,536,576 km (0.091 R)
• M82: 78,617,720 km (0.073 R)
• M83: 80,931,550 km (0.053 R)
• M84: 82,991,812 km (0.079 R)
• M85: 86,044,656 km (0.088 R)
• M86: 86,184,231 km (0.098 R)
• M87: 86,743,577 km (0.102 R)
• M88: 90,834,331 km (0.087 R)
• M89: 94,123,091 km (0.109 R)
• M90: 94,267,004 km (0.081 R)
• M91: 95,420,553 km (0.062 R)
• M92: 95,999,198 km (0.033 R)

Kuiper Belt

Range: 30 - 58 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 246 - 18,069 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit