🌌 Stone's Star System Generator

Planet 1 - Terrestrial

Semi-Major Axis: 0.56 AU

Status: Inner (Hot)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 4.37

Radius: 1.8

Gravity: 1.35 G

Time & Orbit

Eccentricity (e): 0.232

Orbit Range: 0.43 AU - 0.69 AU

Year: 160 Days

Day: 17 Hours

Environment

Temp: 199 °C

Axial Tilt: 3.6 °

Atmosphere: Dense CO₂

Biome: Volcanic/Barren

Planet 2 - Terrestrial

Semi-Major Axis: 0.81 AU

Status: Inner (Hot)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 1.57

Radius: 1.2

Gravity: 1.09 G

Time & Orbit

Eccentricity (e): 0.091

Orbit Range: 0.74 AU - 0.88 AU

Year: 278 Days

Day: 31.7 Hours

Environment

Temp: 102 °C

Axial Tilt: 32 °

Atmosphere: Dense CO₂

Biome: Volcanic/Barren

Planet 3 - Terrestrial

Semi-Major Axis: 2.58 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 2.36

Radius: 1.41

Gravity: 1.19 G

Time & Orbit

Eccentricity (e): 0.195

Orbit Range: 2.08 AU - 3.08 AU

Year: 1578 Days

Day: 37.9 Hours

Environment

Temp: -104 °C

Axial Tilt: 20.9 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Satellites (1)

Outer Limit: 50,272,913 km

• M1: 163,660 km (0.116 R)

Planet 4 - Terrestrial

Semi-Major Axis: 3.43 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 1.3

Radius: 1.11

Gravity: 1.06 G

Time & Orbit

Eccentricity (e): 0.164

Orbit Range: 2.87 AU - 3.99 AU

Year: 2419 Days

Day: 15.2 Hours

Environment

Temp: -122 °C

Axial Tilt: 46.3 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Planet 5 - Terrestrial

Semi-Major Axis: 3.81 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 4.13

Radius: 1.76

Gravity: 1.33 G

Time & Orbit

Eccentricity (e): 0.193

Orbit Range: 3.07 AU - 4.55 AU

Year: 2832 Days

Day: 21.7 Hours

Environment

Temp: -134 °C

Axial Tilt: 1.4 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Satellites (1)

Outer Limit: 50,272,913 km

• M1: 495,019 km (0.107 R)

Asteroid Belt

Center: 5.11 AU

Composition

Type: Main (Rocky/Icy Mix)

A dense region of planetesimals and debris.

Boundary

Planet 6 - Gas Giant

Semi-Major Axis: 6.4 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 905.5

Radius: 11.7

Gravity: 6.61 G

Time & Orbit

Eccentricity (e): 0.078

Orbit Range: 5.9 AU - 6.9 AU

Year: 6165 Days

Day: 6.7 Hours

Environment

Temp: -151 °C

Axial Tilt: 52.1 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (79)

Outer Limit: 50,272,913 km

• M1: 146,756 km (0.076 R)
• M2: 323,431 km (0.092 R)
• M3: 415,732 km (0.064 R)
• M4: 569,968 km (0.062 R)
• M5: 745,745 km (0.052 R)
• M6: 1,204,861 km (0.12 R)
• M7: 1,345,932 km (0.103 R)
• M8: 1,492,837 km (0.106 R)
• M9: 1,587,533 km (0.088 R)
• M10: 1,664,725 km (0.085 R)
• M11: 1,843,345 km (0.104 R)
• M12: 1,924,876 km (0.107 R)
• M13: 2,263,266 km (0.071 R)
• M14: 2,666,732 km (0.093 R)
• M15: 2,829,943 km (0.107 R)
• M16: 2,948,424 km (0.099 R)
• M17: 3,166,239 km (0.12 R)
• M18: 3,239,991 km (0.03 R)
• M19: 3,314,341 km (0.114 R)
• M20: 4,009,522 km (0.084 R)
• M21: 4,116,335 km (0.115 R)
• M22: 4,251,272 km (0.066 R)
• M23: 4,332,803 km (0.094 R)
• M24: 4,470,134 km (0.092 R)
• M25: 4,692,885 km (0.084 R)
• M26: 4,777,258 km (0.09 R)
• M27: 4,947,800 km (0.088 R)
• M28: 5,120,286 km (0.101 R)
• M29: 5,501,013 km (0.093 R)
• M30: 5,590,173 km (0.09 R)
• M31: 6,073,973 km (0.049 R)
• M32: 6,289,992 km (0.106 R)
• M33: 6,477,139 km (0.114 R)
• M34: 7,905,200 km (0.119 R)
• M35: 8,723,949 km (0.103 R)
• M36: 8,863,075 km (0.115 R)
• M37: 9,178,727 km (0.095 R)
• M38: 9,857,452 km (0.085 R)
• M39: 10,404,682 km (0.109 R)
• M40: 11,414,617 km (0.091 R)
• M41: 12,338,384 km (0.038 R)
• M42: 12,494,713 km (0.107 R)
• M43: 12,612,447 km (0.065 R)
• M44: 12,928,098 km (0.065 R)
• M45: 13,047,029 km (0.102 R)
• M46: 15,461,239 km (0.105 R)
• M47: 15,756,695 km (0.051 R)
• M48: 16,054,095 km (0.068 R)
• M49: 16,182,002 km (0.088 R)
• M50: 16,568,114 km (0.048 R)
• M51: 16,827,217 km (0.075 R)
• M52: 17,612,457 km (0.107 R)
• M53: 18,365,083 km (0.044 R)
• M54: 18,543,703 km (0.097 R)
• M55: 18,767,801 km (0.055 R)
• M56: 19,855,976 km (0.083 R)
• M57: 20,500,144 km (0.112 R)
• M58: 21,432,438 km (0.11 R)
• M59: 22,045,789 km (0.055 R)
• M60: 22,616,954 km (0.088 R)
• M61: 24,262,082 km (0.068 R)
• M62: 24,703,994 km (0.107 R)
• M63: 25,346,966 km (0.112 R)
• M64: 25,745,345 km (0.111 R)
• M65: 26,548,536 km (0.03 R)
• M66: 26,902,484 km (0.067 R)
• M67: 27,564,006 km (0.108 R)
• M68: 28,333,837 km (0.087 R)
• M69: 28,592,043 km (0.03 R)
• M70: 28,902,907 km (0.115 R)
• M71: 29,423,657 km (0.118 R)
• M72: 29,632,795 km (0.1 R)
• M73: 31,004,159 km (0.079 R)
• M74: 31,110,373 km (0.088 R)
• M75: 31,858,213 km (0.108 R)
• M76: 33,045,422 km (0.093 R)
• M77: 33,535,205 km (0.087 R)
• M78: 33,808,371 km (0.103 R)
• M79: 34,246,992 km (0.079 R)

Planet 7 - Gas Giant

Semi-Major Axis: 7.63 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 104.5

Radius: 10.3

Gravity: 0.99 G

Time & Orbit

Eccentricity (e): 0.13

Orbit Range: 6.64 AU - 8.62 AU

Year: 8026 Days

Day: 11.1 Hours

Environment

Temp: -167 °C

Axial Tilt: 38.7 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (59)

Outer Limit: 50,272,913 km

• M1: 128,804 km (0.109 R)
• M2: 310,715 km (0.096 R)
• M3: 570,716 km (0.081 R)
• M4: 721,810 km (0.087 R)
• M5: 1,042,248 km (0.094 R)
• M6: 1,123,330 km (0.098 R)
• M7: 1,194,689 km (0.078 R)
• M8: 1,292,376 km (0.115 R)
• M9: 1,779,616 km (0.103 R)
• M10: 1,877,902 km (0.104 R)
• M11: 2,139,399 km (0.094 R)
• M12: 2,381,897 km (0.057 R)
• M13: 2,860,461 km (0.109 R)
• M14: 3,403,800 km (0.107 R)
• M15: 3,960,454 km (0.081 R)
• M16: 4,487,787 km (0.063 R)
• M17: 5,097,547 km (0.11 R)
• M18: 5,525,248 km (0.053 R)
• M19: 5,712,245 km (0.1 R)
• M20: 6,071,130 km (0.078 R)
• M21: 6,350,430 km (0.087 R)
• M22: 6,459,038 km (0.029 R)
• M23: 6,700,189 km (0.059 R)
• M24: 7,123,551 km (0.081 R)
• M25: 7,327,304 km (0.103 R)
• M26: 7,763,531 km (0.064 R)
• M27: 8,805,929 km (0.102 R)
• M28: 8,975,872 km (0.056 R)
• M29: 9,097,944 km (0.045 R)
• M30: 9,393,101 km (0.04 R)
• M31: 9,541,951 km (0.088 R)
• M32: 9,766,497 km (0.104 R)
• M33: 10,018,121 km (0.1 R)
• M34: 10,579,262 km (0.103 R)
• M35: 11,019,978 km (0.116 R)
• M36: 11,098,367 km (0.115 R)
• M37: 11,282,073 km (0.112 R)
• M38: 11,413,869 km (0.108 R)
• M39: 11,678,956 km (0.12 R)
• M40: 11,892,432 km (0.114 R)
• M41: 11,999,844 km (0.084 R)
• M42: 12,350,651 km (0.115 R)
• M43: 13,090,113 km (0.096 R)
• M44: 13,312,116 km (0.113 R)
• M45: 13,900,485 km (0.11 R)
• M46: 14,411,511 km (0.117 R)
• M47: 14,554,676 km (0.116 R)
• M48: 14,640,695 km (0.077 R)
• M49: 16,457,262 km (0.115 R)
• M50: 16,756,757 km (0.114 R)
• M51: 16,847,114 km (0.032 R)
• M52: 17,452,836 km (0.12 R)
• M53: 17,911,802 km (0.037 R)
• M54: 18,250,940 km (0.095 R)
• M55: 18,966,766 km (0.09 R)
• M56: 19,123,694 km (0.086 R)
• M57: 20,715,864 km (0.105 R)
• M58: 21,789,827 km (0.097 R)
• M59: 22,020,059 km (0.105 R)

Planet 8 - Gas Giant

Semi-Major Axis: 7.68 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 275.1

Radius: 14.9

Gravity: 1.24 G

Time & Orbit

Eccentricity (e): 0.124

Orbit Range: 6.73 AU - 8.63 AU

Year: 8105 Days

Day: 6.8 Hours

Environment

Temp: -174 °C

Axial Tilt: 11.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (74)

Outer Limit: 50,272,913 km

• M1: 506,688 km (0.11 R)
• M2: 612,154 km (0.072 R)
• M3: 876,644 km (0.089 R)
• M4: 1,010,384 km (0.117 R)
• M5: 1,300,005 km (0.04 R)
• M6: 1,503,459 km (0.032 R)
• M7: 1,837,660 km (0.058 R)
• M8: 2,122,644 km (0.1 R)
• M9: 3,252,707 km (0.063 R)
• M10: 3,511,960 km (0.1 R)
• M11: 3,621,914 km (0.061 R)
• M12: 3,868,152 km (0.072 R)
• M13: 4,809,871 km (0.073 R)
• M14: 5,256,420 km (0.119 R)
• M15: 5,846,734 km (0.067 R)
• M16: 6,216,390 km (0.095 R)
• M17: 6,350,430 km (0.048 R)
• M18: 6,757,934 km (0.096 R)
• M19: 7,006,715 km (0.118 R)
• M20: 7,258,489 km (0.084 R)
• M21: 8,177,768 km (0.041 R)
• M22: 8,801,292 km (0.108 R)
• M23: 9,042,742 km (0.027 R)
• M24: 9,594,310 km (0.066 R)
• M25: 9,687,360 km (0.098 R)
• M26: 9,780,709 km (0.086 R)
• M27: 9,936,889 km (0.05 R)
• M28: 10,125,382 km (0.11 R)
• M29: 10,220,078 km (0.066 R)
• M30: 10,410,516 km (0.103 R)
• M31: 10,537,973 km (0.112 R)
• M32: 11,216,250 km (0.073 R)
• M33: 11,346,998 km (0.082 R)
• M34: 11,775,596 km (0.085 R)
• M35: 12,682,907 km (0.119 R)
• M36: 12,990,331 km (0.071 R)
• M37: 13,127,812 km (0.094 R)
• M38: 14,457,587 km (0.075 R)
• M39: 14,635,758 km (0.104 R)
• M40: 14,850,581 km (0.089 R)
• M41: 15,501,182 km (0.111 R)
• M42: 15,647,040 km (0.051 R)
• M43: 15,756,845 km (0.108 R)
• M44: 16,013,854 km (0.088 R)
• M45: 16,680,911 km (0.109 R)
• M46: 17,736,922 km (0.101 R)
• M47: 18,388,570 km (0.095 R)
• M48: 18,697,939 km (0.077 R)
• M49: 19,243,672 km (0.066 R)
• M50: 19,794,491 km (0.106 R)
• M51: 20,670,686 km (0.085 R)
• M52: 21,275,360 km (0.068 R)
• M53: 21,518,756 km (0.118 R)
• M54: 21,681,668 km (0.086 R)
• M55: 21,844,879 km (0.077 R)
• M56: 22,090,519 km (0.108 R)
• M57: 22,296,067 km (0.078 R)
• M58: 24,215,557 km (0.113 R)
• M59: 24,639,966 km (0.042 R)
• M60: 25,152,339 km (0.047 R)
• M61: 25,452,881 km (0.12 R)
• M62: 25,841,087 km (0.095 R)
• M63: 25,970,938 km (0.113 R)
• M64: 26,667,017 km (0.1 R)
• M65: 26,929,561 km (0.093 R)
• M66: 27,369,230 km (0.113 R)
• M67: 27,545,755 km (0.07 R)
• M68: 27,811,291 km (0.069 R)
• M69: 27,988,714 km (0.105 R)
• M70: 28,122,006 km (0.08 R)
• M71: 28,612,837 km (0.1 R)
• M72: 30,011,128 km (0.111 R)
• M73: 30,147,561 km (0.058 R)
• M74: 30,695,688 km (0.114 R)

Planet 9 - Gas Giant

Semi-Major Axis: 10.14 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 299.3

Radius: 9.1

Gravity: 3.61 G

Time & Orbit

Eccentricity (e): 0.013

Orbit Range: 10.01 AU - 10.27 AU

Year: 12296 Days

Day: 9 Hours

Environment

Temp: -172 °C

Axial Tilt: 30 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (77)

Outer Limit: 50,272,913 km

• M1: 148,700 km (0.097 R)
• M2: 267,930 km (0.093 R)
• M3: 446,250 km (0.117 R)
• M4: 664,813 km (0.056 R)
• M5: 851,361 km (0.077 R)
• M6: 1,126,771 km (0.1 R)
• M7: 2,293,934 km (0.106 R)
• M8: 2,653,717 km (0.098 R)
• M9: 3,920,960 km (0.05 R)
• M10: 4,409,098 km (0.109 R)
• M11: 4,735,371 km (0.067 R)
• M12: 6,084,295 km (0.103 R)
• M13: 6,347,737 km (0.06 R)
• M14: 6,885,691 km (0.08 R)
• M15: 7,022,573 km (0.05 R)
• M16: 7,649,388 km (0.075 R)
• M17: 7,720,148 km (0.114 R)
• M18: 7,826,661 km (0.099 R)
• M19: 8,077,238 km (0.107 R)
• M20: 8,185,397 km (0.116 R)
• M21: 8,622,971 km (0.101 R)
• M22: 9,030,924 km (0.105 R)
• M23: 9,369,315 km (0.083 R)
• M24: 9,635,300 km (0.086 R)
• M25: 10,330,930 km (0.04 R)
• M26: 10,566,397 km (0.096 R)
• M27: 10,724,522 km (0.062 R)
• M28: 10,962,831 km (0.118 R)
• M29: 11,364,202 km (0.11 R)
• M30: 11,485,526 km (0.11 R)
• M31: 11,566,758 km (0.075 R)
• M32: 11,770,360 km (0.111 R)
• M33: 12,347,060 km (0.071 R)
• M34: 12,975,072 km (0.113 R)
• M35: 13,484,902 km (0.033 R)
• M36: 14,044,697 km (0.119 R)
• M37: 14,656,103 km (0.098 R)
• M38: 15,009,304 km (0.084 R)
• M39: 15,320,767 km (0.078 R)
• M40: 16,313,349 km (0.032 R)
• M41: 16,450,231 km (0.083 R)
• M42: 16,541,785 km (0.047 R)
• M43: 17,373,100 km (0.11 R)
• M44: 17,887,866 km (0.032 R)
• M45: 19,801,672 km (0.064 R)
• M46: 20,143,204 km (0.116 R)
• M47: 21,829,770 km (0.084 R)
• M48: 22,182,522 km (0.1 R)
• M49: 22,842,847 km (0.053 R)
• M50: 23,303,758 km (0.047 R)
• M51: 23,509,605 km (0.062 R)
• M52: 23,612,678 km (0.117 R)
• M53: 24,600,173 km (0.096 R)
• M54: 24,914,777 km (0.112 R)
• M55: 25,866,519 km (0.095 R)
• M56: 26,293,322 km (0.079 R)
• M57: 26,668,812 km (0.032 R)
• M58: 26,937,939 km (0.098 R)
• M59: 28,297,634 km (0.11 R)
• M60: 30,575,411 km (0.067 R)
• M61: 31,139,994 km (0.102 R)
• M62: 31,253,239 km (0.116 R)
• M63: 31,480,329 km (0.063 R)
• M64: 31,650,870 km (0.114 R)
• M65: 32,508,664 km (0.12 R)
• M66: 33,490,027 km (0.084 R)
• M67: 33,896,933 km (0.113 R)
• M68: 35,540,864 km (0.081 R)
• M69: 37,451,378 km (0.082 R)
• M70: 37,813,255 km (0.115 R)
• M71: 38,479,863 km (0.101 R)
• M72: 38,783,996 km (0.105 R)
• M73: 39,272,583 km (0.061 R)
• M74: 39,394,954 km (0.066 R)
• M75: 41,308,909 km (0.045 R)
• M76: 41,433,524 km (0.091 R)
• M77: 41,620,521 km (0.101 R)

Planet 10 - Ice Giant

Semi-Major Axis: 13.48 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 222.5

Radius: 7.2

Gravity: 4.29 G

Time & Orbit

Eccentricity (e): 0.195

Orbit Range: 10.85 AU - 16.11 AU

Year: 18847 Days

Day: 22.5 Hours

Environment

Temp: -196 °C

Axial Tilt: 17.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (94)

Outer Limit: 50,272,913 km

• M1: 102,175 km (0.053 R)
• M2: 181,761 km (0.108 R)
• M3: 552,764 km (0.12 R)
• M4: 1,267,842 km (0.101 R)
• M5: 1,535,772 km (0.104 R)
• M6: 1,724,265 km (0.117 R)
• M7: 1,870,721 km (0.11 R)
• M8: 2,097,961 km (0.093 R)
• M9: 2,334,026 km (0.118 R)
• M10: 2,523,566 km (0.071 R)
• M11: 2,690,219 km (0.104 R)
• M12: 3,063,465 km (0.074 R)
• M13: 3,669,337 km (0.114 R)
• M14: 3,986,035 km (0.112 R)
• M15: 4,645,612 km (0.093 R)
• M16: 4,781,597 km (0.039 R)
• M17: 4,918,928 km (0.038 R)
• M18: 5,303,245 km (0.054 R)
• M19: 5,374,154 km (0.119 R)
• M20: 6,324,848 km (0.098 R)
• M21: 7,130,134 km (0.045 R)
• M22: 7,886,201 km (0.048 R)
• M23: 7,967,283 km (0.089 R)
• M24: 8,089,355 km (0.074 R)
• M25: 8,376,733 km (0.051 R)
• M26: 8,542,487 km (0.026 R)
• M27: 8,835,250 km (0.119 R)
• M28: 9,046,183 km (0.102 R)
• M29: 9,387,416 km (0.079 R)
• M30: 10,082,448 km (0.118 R)
• M31: 10,302,955 km (0.111 R)
• M32: 11,429,726 km (0.09 R)
• M33: 11,613,582 km (0.083 R)
• M34: 12,737,511 km (0.03 R)
• M35: 12,880,377 km (0.116 R)
• M36: 13,360,586 km (0.108 R)
• M37: 14,586,690 km (0.115 R)
• M38: 15,644,048 km (0.098 R)
• M39: 16,259,344 km (0.077 R)
• M40: 16,362,716 km (0.105 R)
• M41: 16,778,149 km (0.087 R)
• M42: 16,882,569 km (0.109 R)
• M43: 17,672,595 km (0.117 R)
• M44: 18,690,459 km (0.041 R)
• M45: 19,397,758 km (0.113 R)
• M46: 19,452,660 km (0.085 R)
• M47: 20,058,531 km (0.12 R)
• M48: 20,670,686 km (0.071 R)
• M49: 22,716,437 km (0.109 R)
• M50: 23,587,844 km (0.049 R)
• M51: 25,783,492 km (0.094 R)
• M52: 26,085,082 km (0.058 R)
• M53: 28,353,733 km (0.057 R)
• M54: 28,727,578 km (0.071 R)
• M55: 28,915,024 km (0.119 R)
• M56: 29,354,094 km (0.104 R)
• M57: 29,732,278 km (0.119 R)
• M58: 29,985,248 km (0.115 R)
• M59: 30,048,677 km (0.117 R)
• M60: 30,112,107 km (0.1 R)
• M61: 30,302,545 km (0.059 R)
• M62: 30,620,889 km (0.119 R)
• M63: 30,940,430 km (0.079 R)
• M64: 31,840,860 km (0.111 R)
• M65: 32,424,142 km (0.064 R)
• M66: 32,880,415 km (0.097 R)
• M67: 34,327,924 km (0.053 R)
• M68: 34,593,311 km (0.11 R)
• M69: 34,726,303 km (0.115 R)
• M70: 34,792,725 km (0.066 R)
• M71: 35,460,530 km (0.113 R)
• M72: 35,594,569 km (0.118 R)
• M73: 35,661,739 km (0.063 R)
• M74: 35,796,078 km (0.112 R)
• M75: 35,930,566 km (0.115 R)
• M76: 36,065,204 km (0.037 R)
• M77: 36,132,523 km (0.068 R)
• M78: 36,335,079 km (0.085 R)
• M79: 37,080,525 km (0.102 R)
• M80: 37,625,809 km (0.115 R)
• M81: 38,173,786 km (0.078 R)
• M82: 38,517,562 km (0.101 R)
• M83: 38,724,306 km (0.119 R)
• M84: 39,346,933 km (0.075 R)
• M85: 41,163,948 km (0.112 R)
• M86: 43,509,494 km (0.065 R)
• M87: 43,581,151 km (0.1 R)
• M88: 44,589,740 km (0.096 R)
• M89: 44,806,956 km (0.117 R)
• M90: 46,117,134 km (0.114 R)
• M91: 46,556,653 km (0.084 R)
• M92: 47,957,637 km (0.088 R)
• M93: 48,254,289 km (0.049 R)
• M94: 49,372,384 km (0.097 R)

Kuiper Belt

Range: 30 - 51 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 484 - 18,673 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit