🌌 Stone's Star System Generator

Planet 1 - Terrestrial

Semi-Major Axis: 0.55 AU

Status: Inner (Hot)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 4.22

Radius: 1.78

Gravity: 1.33 G

Time & Orbit

Eccentricity (e): 0.024

Orbit Range: 0.54 AU - 0.56 AU

Year: 143 Days

Day: 32.4 Hours

Environment

Temp: 236 °C

Axial Tilt: 9.4 °

Atmosphere: Dense CO₂

Biome: Volcanic/Barren

Satellites (2)

Outer Limit: 65,423,465 km

• M1: 62,083 km (0.026 R)
• M2: 470,784 km (0.117 R)

Planet 2 - Terrestrial

Semi-Major Axis: 1 AU

Status: Inner (Hot)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 2.59

Radius: 1.46

Gravity: 1.22 G

Time & Orbit

Eccentricity (e): 0.215

Orbit Range: 0.79 AU - 1.22 AU

Year: 351 Days

Day: 23 Hours

Environment

Temp: 102 °C

Axial Tilt: 10 °

Atmosphere: Dense CO₂

Biome: Volcanic/Barren

Satellites (1)

Outer Limit: 65,423,465 km

• M1: 65,075 km (0.114 R)

Planet 3 - Terrestrial

Semi-Major Axis: 2.65 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 1.99

Radius: 1.32

Gravity: 1.14 G

Time & Orbit

Eccentricity (e): 0.104

Orbit Range: 2.37 AU - 2.93 AU

Year: 1516 Days

Day: 23.7 Hours

Environment

Temp: -85 °C

Axial Tilt: 29 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Satellites (1)

Outer Limit: 65,423,465 km

• M1: 64,776 km (0.106 R)

Planet 4 - Gas Giant

Semi-Major Axis: 5.94 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 962.3

Radius: 10.6

Gravity: 8.56 G

Time & Orbit

Eccentricity (e): 0.062

Orbit Range: 5.57 AU - 6.31 AU

Year: 5088 Days

Day: 5.2 Hours

Environment

Temp: -143 °C

Axial Tilt: 17 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (80)

Outer Limit: 65,423,465 km

• M1: 137,480 km (0.058 R)
• M2: 221,106 km (0.026 R)
• M3: 326,871 km (0.03 R)
• M4: 490,232 km (0.105 R)
• M5: 657,931 km (0.12 R)
• M6: 790,326 km (0.104 R)
• M7: 902,973 km (0.102 R)
• M8: 1,225,805 km (0.11 R)
• M9: 1,638,097 km (0.106 R)
• M10: 2,013,737 km (0.066 R)
• M11: 2,584,303 km (0.079 R)
• M12: 3,458,703 km (0.108 R)
• M13: 3,577,035 km (0.106 R)
• M14: 3,866,806 km (0.04 R)
• M15: 4,341,181 km (0.102 R)
• M16: 4,572,309 km (0.116 R)
• M17: 4,781,298 km (0.07 R)
• M18: 5,046,983 km (0.09 R)
• M19: 5,235,776 km (0.119 R)
• M20: 5,565,041 km (0.052 R)
• M21: 5,844,639 km (0.117 R)
• M22: 6,100,152 km (0.093 R)
• M23: 6,214,894 km (0.113 R)
• M24: 6,504,964 km (0.115 R)
• M25: 6,740,282 km (0.104 R)
• M26: 7,371,285 km (0.096 R)
• M27: 7,740,493 km (0.037 R)
• M28: 8,115,684 km (0.084 R)
• M29: 9,575,012 km (0.106 R)
• M30: 10,489,055 km (0.12 R)
• M31: 10,973,901 km (0.107 R)
• M32: 11,324,858 km (0.103 R)
• M33: 11,679,405 km (0.093 R)
• M34: 12,254,310 km (0.059 R)
• M35: 12,618,281 km (0.099 R)
• M36: 14,300,210 km (0.111 R)
• M37: 14,760,523 km (0.096 R)
• M38: 15,264,668 km (0.073 R)
• M39: 15,460,042 km (0.102 R)
• M40: 16,290,011 km (0.09 R)
• M41: 16,770,669 km (0.12 R)
• M42: 17,134,342 km (0.093 R)
• M43: 18,282,057 km (0.08 R)
• M44: 18,365,083 km (0.117 R)
• M45: 18,698,088 km (0.112 R)
• M46: 18,781,713 km (0.115 R)
• M47: 19,075,075 km (0.089 R)
• M48: 19,285,709 km (0.107 R)
• M49: 19,370,082 km (0.079 R)
• M50: 20,221,294 km (0.08 R)
• M51: 20,435,967 km (0.06 R)
• M52: 21,041,240 km (0.109 R)
• M53: 21,477,168 km (0.032 R)
• M54: 22,092,464 km (0.075 R)
• M55: 22,981,374 km (0.042 R)
• M56: 23,070,984 km (0.118 R)
• M57: 23,205,472 km (0.077 R)
• M58: 23,430,318 km (0.07 R)
• M59: 24,018,237 km (0.079 R)
• M60: 24,291,253 km (0.032 R)
• M61: 24,611,094 km (0.035 R)
• M62: 24,748,574 km (0.095 R)
• M63: 25,347,265 km (0.047 R)
• M64: 25,439,716 km (0.062 R)
• M65: 25,671,593 km (0.113 R)
• M66: 25,811,018 km (0.106 R)
• M67: 26,888,422 km (0.054 R)
• M68: 27,219,183 km (0.069 R)
• M69: 28,123,951 km (0.117 R)
• M70: 28,459,649 km (0.03 R)
• M71: 28,893,482 km (0.119 R)
• M72: 30,403,972 km (0.078 R)
• M73: 31,541,365 km (0.095 R)
• M74: 31,690,663 km (0.116 R)
• M75: 31,990,158 km (0.078 R)
• M76: 32,190,320 km (0.095 R)
• M77: 32,290,551 km (0.103 R)
• M78: 32,742,785 km (0.038 R)
• M79: 32,995,007 km (0.046 R)
• M80: 34,163,516 km (0.057 R)

Asteroid Belt

Center: 7.29 AU

Composition

Type: Outer System (Icy)

A dense region of planetesimals and debris.

Boundary

Planet 5 - Gas Giant

Semi-Major Axis: 8.63 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 174.6

Radius: 12.2

Gravity: 1.17 G

Time & Orbit

Eccentricity (e): 0.052

Orbit Range: 8.18 AU - 9.08 AU

Year: 8910 Days

Day: 7.4 Hours

Environment

Temp: -160 °C

Axial Tilt: 34.8 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (61)

Outer Limit: 65,423,465 km

• M1: 154,235 km (0.119 R)
• M2: 648,058 km (0.085 R)
• M3: 738,116 km (0.117 R)
• M4: 1,076,955 km (0.095 R)
• M5: 1,388,717 km (0.082 R)
• M6: 1,509,293 km (0.086 R)
• M7: 1,586,635 km (0.083 R)
• M8: 1,681,181 km (0.043 R)
• M9: 1,959,882 km (0.094 R)
• M10: 2,711,761 km (0.09 R)
• M11: 3,299,680 km (0.113 R)
• M12: 3,401,556 km (0.108 R)
• M13: 3,525,274 km (0.081 R)
• M14: 3,862,467 km (0.08 R)
• M15: 4,188,142 km (0.103 R)
• M16: 4,320,985 km (0.093 R)
• M17: 4,455,174 km (0.06 R)
• M18: 4,636,487 km (0.043 R)
• M19: 4,936,131 km (0.101 R)
• M20: 5,289,781 km (0.112 R)
• M21: 5,409,609 km (0.101 R)
• M22: 5,774,328 km (0.071 R)
• M23: 5,873,063 km (0.065 R)
• M24: 6,147,276 km (0.056 R)
• M25: 6,349,233 km (0.097 R)
• M26: 6,553,584 km (0.114 R)
• M27: 6,630,776 km (0.118 R)
• M28: 7,073,885 km (0.053 R)
• M29: 7,153,172 km (0.091 R)
• M30: 7,259,237 km (0.116 R)
• M31: 7,365,900 km (0.07 R)
• M32: 7,473,012 km (0.042 R)
• M33: 7,906,696 km (0.06 R)
• M34: 8,044,027 km (0.077 R)
• M35: 8,237,457 km (0.074 R)
• M36: 8,912,742 km (0.117 R)
• M37: 10,106,982 km (0.09 R)
• M38: 11,166,135 km (0.112 R)
• M39: 12,387,601 km (0.066 R)
• M40: 13,160,274 km (0.038 R)
• M41: 14,048,138 km (0.116 R)
• M42: 14,147,919 km (0.078 R)
• M43: 14,650,718 km (0.117 R)
• M44: 14,785,805 km (0.058 R)
• M45: 15,296,083 km (0.116 R)
• M46: 15,433,115 km (0.087 R)
• M47: 17,074,054 km (0.12 R)
• M48: 18,077,706 km (0.096 R)
• M49: 18,295,221 km (0.11 R)
• M50: 18,623,289 km (0.085 R)
• M51: 19,063,705 km (0.114 R)
• M52: 21,278,352 km (0.083 R)
• M53: 21,546,581 km (0.058 R)
• M54: 22,825,793 km (0.12 R)
• M55: 23,021,766 km (0.079 R)
• M56: 23,970,216 km (0.077 R)
• M57: 24,329,251 km (0.072 R)
• M58: 25,782,894 km (0.065 R)
• M59: 25,986,945 km (0.085 R)
• M60: 26,273,575 km (0.107 R)
• M61: 26,891,414 km (0.09 R)

Planet 6 - Gas Giant

Semi-Major Axis: 11.12 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 964.3

Radius: 11.8

Gravity: 6.93 G

Time & Orbit

Eccentricity (e): 0.239

Orbit Range: 8.46 AU - 13.78 AU

Year: 13033 Days

Day: 12.7 Hours

Environment

Temp: -178 °C

Axial Tilt: 19.1 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (87)

Outer Limit: 65,423,465 km

• M1: 301,141 km (0.078 R)
• M2: 495,767 km (0.058 R)
• M3: 757,264 km (0.08 R)
• M4: 1,110,166 km (0.115 R)
• M5: 1,539,811 km (0.069 R)
• M6: 1,816,118 km (0.09 R)
• M7: 1,902,287 km (0.073 R)
• M8: 2,416,454 km (0.117 R)
• M9: 2,939,149 km (0.096 R)
• M10: 3,144,248 km (0.043 R)
• M11: 3,861,869 km (0.098 R)
• M12: 3,973,918 km (0.115 R)
• M13: 4,239,454 km (0.066 R)
• M14: 4,629,157 km (0.109 R)
• M15: 4,868,513 km (0.116 R)
• M16: 5,071,218 km (0.115 R)
• M17: 5,153,048 km (0.089 R)
• M18: 5,235,327 km (0.114 R)
• M19: 6,971,859 km (0.05 R)
• M20: 7,431,873 km (0.091 R)
• M21: 7,618,720 km (0.116 R)
• M22: 7,901,760 km (0.1 R)
• M23: 8,284,730 km (0.078 R)
• M24: 8,429,840 km (0.053 R)
• M25: 8,624,766 km (0.115 R)
• M26: 8,722,753 km (0.053 R)
• M27: 9,469,695 km (0.099 R)
• M28: 9,876,451 km (0.118 R)
• M29: 9,979,076 km (0.038 R)
• M30: 10,082,148 km (0.114 R)
• M31: 10,812,635 km (0.075 R)
• M32: 13,615,949 km (0.066 R)
• M33: 16,385,455 km (0.102 R)
• M34: 16,935,227 km (0.036 R)
• M35: 17,119,831 km (0.091 R)
• M36: 17,553,216 km (0.085 R)
• M37: 17,864,978 km (0.052 R)
• M38: 19,130,277 km (0.087 R)
• M39: 19,838,473 km (0.106 R)
• M40: 20,228,325 km (0.094 R)
• M41: 20,555,196 km (0.108 R)
• M42: 21,015,808 km (0.102 R)
• M43: 21,280,596 km (0.116 R)
• M44: 21,813,314 km (0.117 R)
• M45: 22,283,052 km (0.093 R)
• M46: 23,164,482 km (0.097 R)
• M47: 23,437,947 km (0.082 R)
• M48: 24,681,704 km (0.104 R)
• M49: 25,593,503 km (0.12 R)
• M50: 25,805,334 km (0.032 R)
• M51: 27,161,289 km (0.073 R)
• M52: 29,719,263 km (0.101 R)
• M53: 29,793,463 km (0.113 R)
• M54: 30,613,858 km (0.095 R)
• M55: 31,441,583 km (0.053 R)
• M56: 33,273,259 km (0.07 R)
• M57: 33,427,345 km (0.041 R)
• M58: 33,659,222 km (0.111 R)
• M59: 33,813,906 km (0.087 R)
• M60: 34,357,545 km (0.064 R)
• M61: 35,060,804 km (0.092 R)
• M62: 36,005,814 km (0.05 R)
• M63: 36,402,099 km (0.09 R)
• M64: 37,519,146 km (0.12 R)
• M65: 38,001,450 km (0.118 R)
• M66: 38,081,933 km (0.053 R)
• M67: 38,647,563 km (0.047 R)
• M68: 39,542,008 km (0.09 R)
• M69: 39,868,880 km (0.119 R)
• M70: 40,196,649 km (0.066 R)
• M71: 40,525,465 km (0.078 R)
• M72: 41,020,185 km (0.046 R)
• M73: 41,433,973 km (0.087 R)
• M74: 46,162,761 km (0.068 R)
• M75: 47,631,663 km (0.046 R)
• M76: 49,203,787 km (0.085 R)
• M77: 50,349,707 km (0.066 R)
• M78: 51,682,923 km (0.083 R)
• M79: 52,578,116 km (0.075 R)
• M80: 52,668,025 km (0.107 R)
• M81: 53,027,658 km (0.049 R)
• M82: 54,656,629 km (0.069 R)
• M83: 54,929,645 km (0.109 R)
• M84: 58,056,241 km (0.096 R)
• M85: 61,334,529 km (0.084 R)
• M86: 61,429,074 km (0.094 R)
• M87: 64,095,956 km (0.049 R)

Planet 7 - Gas Giant

Semi-Major Axis: 11.58 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 969.7

Radius: 9.7

Gravity: 10.31 G

Time & Orbit

Eccentricity (e): 0.169

Orbit Range: 9.62 AU - 13.54 AU

Year: 13850 Days

Day: 5.3 Hours

Environment

Temp: -176 °C

Axial Tilt: 31.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (86)

Outer Limit: 65,423,465 km

• M1: 126,560 km (0.108 R)
• M2: 219,610 km (0.093 R)
• M3: 368,759 km (0.076 R)
• M4: 615,146 km (0.101 R)
• M5: 822,639 km (0.092 R)
• M6: 1,101,639 km (0.107 R)
• M7: 1,304,344 km (0.114 R)
• M8: 1,716,785 km (0.055 R)
• M9: 1,863,241 km (0.077 R)
• M10: 2,359,458 km (0.05 R)
• M11: 2,656,260 km (0.119 R)
• M12: 2,723,878 km (0.111 R)
• M13: 2,930,173 km (0.106 R)
• M14: 3,730,223 km (0.111 R)
• M15: 4,193,976 km (0.086 R)
• M16: 4,473,126 km (0.089 R)
• M17: 4,758,259 km (0.109 R)
• M18: 5,007,340 km (0.096 R)
• M19: 5,133,601 km (0.094 R)
• M20: 5,260,759 km (0.115 R)
• M21: 6,225,815 km (0.106 R)
• M22: 6,682,537 km (0.075 R)
• M23: 7,676,465 km (0.082 R)
• M24: 8,265,133 km (0.077 R)
• M25: 8,564,927 km (0.05 R)
• M26: 8,817,448 km (0.069 R)
• M27: 9,021,200 km (0.089 R)
• M28: 11,530,555 km (0.077 R)
• M29: 11,697,656 km (0.085 R)
• M30: 12,260,593 km (0.086 R)
• M31: 14,598,957 km (0.118 R)
• M32: 15,510,756 km (0.108 R)
• M33: 15,942,495 km (0.091 R)
• M34: 16,066,512 km (0.078 R)
• M35: 16,817,942 km (0.119 R)
• M36: 19,008,205 km (0.09 R)
• M37: 21,082,080 km (0.109 R)
• M38: 21,766,341 km (0.077 R)
• M39: 24,503,832 km (0.114 R)
• M40: 25,078,587 km (0.104 R)
• M41: 26,241,561 km (0.093 R)
• M42: 27,347,837 km (0.093 R)
• M43: 27,496,537 km (0.118 R)
• M44: 28,093,732 km (0.12 R)
• M45: 28,318,877 km (0.095 R)
• M46: 29,377,132 km (0.055 R)
• M47: 30,679,531 km (0.054 R)
• M48: 33,261,291 km (0.114 R)
• M49: 33,977,267 km (0.087 R)
• M50: 34,618,144 km (0.118 R)
• M51: 34,940,079 km (0.06 R)
• M52: 36,319,221 km (0.066 R)
• M53: 36,892,331 km (0.111 R)
• M54: 37,716,166 km (0.089 R)
• M55: 38,796,113 km (0.109 R)
• M56: 39,046,839 km (0.101 R)
• M57: 39,130,465 km (0.06 R)
• M58: 39,549,787 km (0.101 R)
• M59: 40,054,979 km (0.065 R)
• M60: 42,354,448 km (0.108 R)
• M61: 44,434,158 km (0.115 R)
• M62: 46,103,969 km (0.097 R)
• M63: 47,080,095 km (0.116 R)
• M64: 47,615,506 km (0.065 R)
• M65: 47,794,425 km (0.042 R)
• M66: 49,776,896 km (0.025 R)
• M67: 50,049,314 km (0.11 R)
• M68: 51,970,151 km (0.11 R)
• M69: 53,914,923 km (0.089 R)
• M70: 54,568,516 km (0.115 R)
• M71: 54,662,015 km (0.054 R)
• M72: 55,412,547 km (0.065 R)
• M73: 56,261,066 km (0.107 R)
• M74: 57,399,057 km (0.087 R)
• M75: 57,780,083 km (0.041 R)
• M76: 59,024,139 km (0.116 R)
• M77: 59,408,606 km (0.065 R)
• M78: 60,180,231 km (0.11 R)
• M79: 61,149,476 km (0.106 R)
• M80: 61,636,118 km (0.067 R)
• M81: 62,319,331 km (0.115 R)
• M82: 62,612,992 km (0.099 R)
• M83: 63,595,102 km (0.115 R)
• M84: 63,989,292 km (0.089 R)
• M85: 64,088,027 km (0.115 R)
• M86: 66,571,651 km (0.051 R)

Planet 8 - Gas Giant

Semi-Major Axis: 11.67 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 887.2

Radius: 9.9

Gravity: 9.05 G

Time & Orbit

Eccentricity (e): 0.009

Orbit Range: 11.56 AU - 11.78 AU

Year: 14011 Days

Day: 13.9 Hours

Environment

Temp: -173 °C

Axial Tilt: 35.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (89)

Outer Limit: 65,423,465 km

• M1: 336,146 km (0.085 R)
• M2: 587,920 km (0.112 R)
• M3: 897,438 km (0.114 R)
• M4: 1,384,678 km (0.114 R)
• M5: 1,573,022 km (0.089 R)
• M6: 1,684,622 km (0.064 R)
• M7: 2,505,465 km (0.095 R)
• M8: 2,603,601 km (0.106 R)
• M9: 2,803,763 km (0.073 R)
• M10: 3,617,277 km (0.076 R)
• M11: 3,841,075 km (0.091 R)
• M12: 4,107,958 km (0.08 R)
• M13: 4,341,629 km (0.056 R)
• M14: 4,781,148 km (0.029 R)
• M15: 5,659,886 km (0.107 R)
• M16: 6,317,668 km (0.114 R)
• M17: 6,497,185 km (0.08 R)
• M18: 6,815,529 km (0.113 R)
• M19: 7,420,204 km (0.118 R)
• M20: 7,514,750 km (0.057 R)
• M21: 10,692,508 km (0.091 R)
• M22: 10,853,026 km (0.056 R)
• M23: 11,176,607 km (0.082 R)
• M24: 11,448,575 km (0.103 R)
• M25: 12,221,847 km (0.12 R)
• M26: 12,671,388 km (0.069 R)
• M27: 13,069,020 km (0.096 R)
• M28: 13,413,244 km (0.067 R)
• M29: 13,760,461 km (0.045 R)
• M30: 14,052,027 km (0.066 R)
• M31: 14,582,052 km (0.117 R)
• M32: 14,998,832 km (0.086 R)
• M33: 15,479,939 km (0.107 R)
• M34: 16,088,503 km (0.107 R)
• M35: 16,211,173 km (0.102 R)
• M36: 17,078,542 km (0.108 R)
• M37: 17,517,761 km (0.119 R)
• M38: 18,987,261 km (0.03 R)
• M39: 19,052,037 km (0.061 R)
• M40: 20,363,262 km (0.087 R)
• M41: 21,029,721 km (0.098 R)
• M42: 22,315,814 km (0.094 R)
• M43: 24,679,909 km (0.103 R)
• M44: 25,533,215 km (0.081 R)
• M45: 27,049,689 km (0.108 R)
• M46: 27,634,915 km (0.091 R)
• M47: 28,372,583 km (0.069 R)
• M48: 28,669,385 km (0.114 R)
• M49: 30,168,954 km (0.075 R)
• M50: 31,004,607 km (0.071 R)
• M51: 31,080,902 km (0.075 R)
• M52: 31,386,980 km (0.082 R)
• M53: 33,165,848 km (0.068 R)
• M54: 34,028,130 km (0.093 R)
• M55: 36,578,325 km (0.086 R)
• M56: 36,659,108 km (0.099 R)
• M57: 37,631,793 km (0.088 R)
• M58: 38,449,046 km (0.051 R)
• M59: 39,520,017 km (0.109 R)
• M60: 40,100,906 km (0.087 R)
• M61: 41,860,177 km (0.115 R)
• M62: 42,028,923 km (0.079 R)
• M63: 43,217,329 km (0.039 R)
• M64: 43,558,861 km (0.104 R)
• M65: 43,815,720 km (0.115 R)
• M66: 45,453,518 km (0.098 R)
• M67: 46,149,148 km (0.088 R)
• M68: 46,410,944 km (0.075 R)
• M69: 49,590,348 km (0.084 R)
• M70: 49,768,968 km (0.111 R)
• M71: 50,126,955 km (0.116 R)
• M72: 51,206,154 km (0.105 R)
• M73: 51,748,596 km (0.071 R)
• M74: 52,292,983 km (0.091 R)
• M75: 52,474,894 km (0.044 R)
• M76: 54,673,833 km (0.118 R)
• M77: 57,934,319 km (0.092 R)
• M78: 58,028,416 km (0.114 R)
• M79: 59,350,861 km (0.118 R)
• M80: 59,635,546 km (0.111 R)
• M81: 60,110,968 km (0.054 R)
• M82: 60,492,293 km (0.114 R)
• M83: 60,587,736 km (0.038 R)
• M84: 61,832,989 km (0.114 R)
• M85: 62,025,372 km (0.09 R)
• M86: 63,086,768 km (0.084 R)
• M87: 63,183,558 km (0.083 R)
• M88: 63,280,498 km (0.059 R)
• M89: 63,377,288 km (0.093 R)

Kuiper Belt

Range: 31.2 - 59.2 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 491 - 14,762 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit