🌌 Stone's Star System Generator

Planet 1 - Terrestrial

Semi-Major Axis: 0.7 AU

Status: Inner (Hot)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 3.35

Radius: 1.62

Gravity: 1.28 G

Time & Orbit

Eccentricity (e): 0.139

Orbit Range: 0.6 AU - 0.8 AU

Year: 206 Days

Day: 25 Hours

Environment

Temp: 152 °C

Axial Tilt: 32.6 °

Atmosphere: Dense CO₂

Biome: Volcanic/Barren

Planet 2 - Terrestrial

Semi-Major Axis: 0.75 AU

Status: Inner (Hot)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 1.25

Radius: 1.09

Gravity: 1.05 G

Time & Orbit

Eccentricity (e): 0.003

Orbit Range: 0.75 AU - 0.75 AU

Year: 228 Days

Day: 22.3 Hours

Environment

Temp: 135 °C

Axial Tilt: 33.5 °

Atmosphere: Dense CO₂

Biome: Volcanic/Barren

Planet 3 - Terrestrial

Semi-Major Axis: 1.2 AU

Status: HZ

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 0.62

Radius: 0.83

Gravity: 0.9 G

Time & Orbit

Eccentricity (e): 0.162

Orbit Range: 1.01 AU - 1.39 AU

Year: 462 Days

Day: 15.6 Hours

Environment

Temp: 27 °C

Axial Tilt: 9.9 °

Atmosphere: N₂, O₂

Biome: Arid/Tundra

Planet 4 - Terrestrial

Semi-Major Axis: 1.94 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 3.61

Radius: 1.67

Gravity: 1.29 G

Time & Orbit

Eccentricity (e): 0.234

Orbit Range: 1.49 AU - 2.39 AU

Year: 950 Days

Day: 16.6 Hours

Environment

Temp: -55 °C

Axial Tilt: 33.3 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Satellites (1)

Outer Limit: 65,960,752 km

• M1: 51,013 km (0.107 R)

Planet 5 - Gas Giant

Semi-Major Axis: 5.9 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 730.2

Radius: 13.6

Gravity: 3.95 G

Time & Orbit

Eccentricity (e): 0.101

Orbit Range: 5.3 AU - 6.5 AU

Year: 5037 Days

Day: 12.3 Hours

Environment

Temp: -132 °C

Axial Tilt: 24 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (79)

Outer Limit: 65,960,752 km

• M1: 179,966 km (0.093 R)
• M2: 668,254 km (0.077 R)
• M3: 827,875 km (0.077 R)
• M4: 1,086,081 km (0.081 R)
• M5: 1,387,071 km (0.095 R)
• M6: 1,597,406 km (0.113 R)
• M7: 1,749,547 km (0.069 R)
• M8: 1,924,427 km (0.084 R)
• M9: 2,032,137 km (0.051 R)
• M10: 2,368,134 km (0.045 R)
• M11: 2,543,014 km (0.098 R)
• M12: 2,864,650 km (0.049 R)
• M13: 3,307,011 km (0.11 R)
• M14: 3,547,414 km (0.104 R)
• M15: 3,748,474 km (0.063 R)
• M16: 4,115,437 km (0.094 R)
• M17: 4,327,118 km (0.066 R)
• M18: 4,761,102 km (0.089 R)
• M19: 5,209,447 km (0.112 R)
• M20: 5,567,434 km (0.076 R)
• M21: 6,039,864 km (0.08 R)
• M22: 6,200,084 km (0.104 R)
• M23: 6,497,784 km (0.11 R)
• M24: 6,662,192 km (0.048 R)
• M25: 7,023,171 km (0.093 R)
• M26: 7,562,172 km (0.037 R)
• M27: 7,648,640 km (0.088 R)
• M28: 7,822,323 km (0.067 R)
• M29: 8,173,728 km (0.104 R)
• M30: 8,530,220 km (0.103 R)
• M31: 8,770,923 km (0.085 R)
• M32: 9,105,424 km (0.066 R)
• M33: 9,289,729 km (0.11 R)
• M34: 9,599,546 km (0.116 R)
• M35: 10,453,151 km (0.092 R)
• M36: 10,613,969 km (0.079 R)
• M37: 10,775,535 km (0.058 R)
• M38: 11,166,733 km (0.083 R)
• M39: 11,662,351 km (0.114 R)
• M40: 12,064,021 km (0.118 R)
• M41: 12,334,344 km (0.063 R)
• M42: 13,575,558 km (0.114 R)
• M43: 13,821,497 km (0.077 R)
• M44: 14,211,050 km (0.105 R)
• M45: 15,328,396 km (0.098 R)
• M46: 15,438,051 km (0.103 R)
• M47: 15,547,856 km (0.115 R)
• M48: 15,805,314 km (0.111 R)
• M49: 16,212,669 km (0.068 R)
• M50: 16,586,066 km (0.096 R)
• M51: 16,736,262 km (0.082 R)
• M52: 19,713,858 km (0.085 R)
• M53: 19,833,237 km (0.071 R)
• M54: 19,992,559 km (0.1 R)
• M55: 20,393,032 km (0.033 R)
• M56: 20,796,198 km (0.109 R)
• M57: 21,161,217 km (0.117 R)
• M58: 21,405,810 km (0.056 R)
• M59: 21,610,310 km (0.071 R)
• M60: 21,815,558 km (0.115 R)
• M61: 22,518,070 km (0.066 R)
• M62: 22,726,011 km (0.092 R)
• M63: 23,185,875 km (0.087 R)
• M64: 23,396,060 km (0.115 R)
• M65: 23,902,748 km (0.064 R)
• M66: 23,987,570 km (0.119 R)
• M67: 25,099,232 km (0.092 R)
• M68: 25,314,952 km (0.082 R)
• M69: 25,531,270 km (0.084 R)
• M70: 25,835,253 km (0.112 R)
• M71: 27,062,853 km (0.117 R)
• M72: 27,417,101 km (0.06 R)
• M73: 27,728,414 km (0.111 R)
• M74: 27,862,155 km (0.096 R)
• M75: 27,951,465 km (0.051 R)
• M76: 28,219,843 km (0.073 R)
• M77: 28,579,028 km (0.113 R)
• M78: 30,535,917 km (0.119 R)
• M79: 30,858,450 km (0.097 R)

Planet 6 - Gas Giant

Semi-Major Axis: 6.19 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 737.5

Radius: 10.5

Gravity: 6.69 G

Time & Orbit

Eccentricity (e): 0.184

Orbit Range: 5.05 AU - 7.33 AU

Year: 5413 Days

Day: 9.5 Hours

Environment

Temp: -134 °C

Axial Tilt: 32.4 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (83)

Outer Limit: 65,960,752 km

• M1: 142,118 km (0.116 R)
• M2: 694,134 km (0.041 R)
• M3: 907,610 km (0.118 R)
• M4: 1,007,990 km (0.115 R)
• M5: 1,112,410 km (0.025 R)
• M6: 1,671,457 km (0.037 R)
• M7: 2,113,668 km (0.085 R)
• M8: 2,408,526 km (0.027 R)
• M9: 2,489,309 km (0.116 R)
• M10: 2,737,491 km (0.048 R)
• M11: 2,864,650 km (0.092 R)
• M12: 3,037,286 km (0.104 R)
• M13: 3,169,081 km (0.118 R)
• M14: 3,438,357 km (0.12 R)
• M15: 3,552,800 km (0.048 R)
• M16: 3,999,499 km (0.055 R)
• M17: 4,217,314 km (0.11 R)
• M18: 4,664,611 km (0.057 R)
• M19: 4,766,188 km (0.045 R)
• M20: 5,153,347 km (0.106 R)
• M21: 5,739,771 km (0.1 R)
• M22: 6,096,263 km (0.085 R)
• M23: 6,263,364 km (0.117 R)
• M24: 6,859,810 km (0.081 R)
• M25: 6,975,450 km (0.097 R)
• M26: 7,150,180 km (0.105 R)
• M27: 7,296,935 km (0.037 R)
• M28: 7,444,738 km (0.104 R)
• M29: 7,623,358 km (0.088 R)
• M30: 8,259,747 km (0.038 R)
• M31: 8,881,626 km (0.097 R)
• M32: 9,326,081 km (0.115 R)
• M33: 9,712,791 km (0.094 R)
• M34: 9,810,329 km (0.068 R)
• M35: 10,269,595 km (0.074 R)
• M36: 10,568,641 km (0.11 R)
• M37: 10,702,381 km (0.113 R)
• M38: 10,769,551 km (0.032 R)
• M39: 10,971,807 km (0.03 R)
• M40: 11,414,168 km (0.118 R)
• M41: 11,585,906 km (0.116 R)
• M42: 11,897,219 km (0.114 R)
• M43: 12,001,639 km (0.115 R)
• M44: 13,098,191 km (0.075 R)
• M45: 13,205,902 km (0.081 R)
• M46: 13,531,127 km (0.059 R)
• M47: 14,783,561 km (0.112 R)
• M48: 15,045,955 km (0.049 R)
• M49: 15,158,902 km (0.106 R)
• M50: 16,072,646 km (0.063 R)
• M51: 16,149,539 km (0.12 R)
• M52: 16,419,862 km (0.105 R)
• M53: 16,574,995 km (0.044 R)
• M54: 17,634,896 km (0.059 R)
• M55: 17,833,562 km (0.09 R)
• M56: 18,153,103 km (0.105 R)
• M57: 18,474,439 km (0.098 R)
• M58: 19,408,678 km (0.076 R)
• M59: 20,358,475 km (0.092 R)
• M60: 20,608,752 km (0.037 R)
• M61: 22,647,173 km (0.09 R)
• M62: 24,394,326 km (0.118 R)
• M63: 25,060,785 km (0.061 R)
• M64: 25,643,020 km (0.068 R)
• M65: 26,048,879 km (0.032 R)
• M66: 26,229,892 km (0.068 R)
• M67: 26,366,026 km (0.112 R)
• M68: 26,775,476 km (0.076 R)
• M69: 27,003,912 km (0.074 R)
• M70: 27,693,259 km (0.119 R)
• M71: 27,924,238 km (0.064 R)
• M72: 28,341,765 km (0.09 R)
• M73: 28,854,736 km (0.093 R)
• M74: 29,182,954 km (0.105 R)
• M75: 29,276,902 km (0.091 R)
• M76: 29,559,342 km (0.108 R)
• M77: 29,653,739 km (0.085 R)
• M78: 29,937,526 km (0.119 R)
• M79: 30,079,644 km (0.068 R)
• M80: 31,081,351 km (0.118 R)
• M81: 31,513,988 km (0.103 R)
• M82: 31,851,930 km (0.11 R)
• M83: 32,045,509 km (0.026 R)

Asteroid Belt

Center: 7.4 AU

Composition

Type: Outer System (Icy)

A dense region of planetesimals and debris.

Boundary

Planet 7 - Gas Giant

Semi-Major Axis: 8.6 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 344.8

Radius: 9.7

Gravity: 3.66 G

Time & Orbit

Eccentricity (e): 0.193

Orbit Range: 6.94 AU - 10.26 AU

Year: 8864 Days

Day: 12.2 Hours

Environment

Temp: -162 °C

Axial Tilt: 3.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (77)

Outer Limit: 65,960,752 km

• M1: 444,306 km (0.065 R)
• M2: 661,971 km (0.069 R)
• M3: 826,528 km (0.11 R)
• M4: 929,003 km (0.107 R)
• M5: 1,004,998 km (0.058 R)
• M6: 1,083,089 km (0.053 R)
• M7: 1,147,266 km (0.04 R)
• M8: 1,330,673 km (0.115 R)
• M9: 1,470,248 km (0.12 R)
• M10: 1,596,508 km (0.092 R)
• M11: 2,218,985 km (0.046 R)
• M12: 2,621,852 km (0.082 R)
• M13: 3,001,681 km (0.06 R)
• M14: 3,303,869 km (0.041 R)
• M15: 3,422,799 km (0.057 R)
• M16: 4,064,125 km (0.062 R)
• M17: 4,166,151 km (0.088 R)
• M18: 4,243,194 km (0.087 R)
• M19: 4,556,302 km (0.025 R)
• M20: 5,343,486 km (0.096 R)
• M21: 5,853,316 km (0.11 R)
• M22: 6,026,700 km (0.069 R)
• M23: 6,378,704 km (0.119 R)
• M24: 6,828,096 km (0.066 R)
• M25: 6,949,719 km (0.078 R)
• M26: 7,164,242 km (0.116 R)
• M27: 7,568,455 km (0.103 R)
• M28: 7,725,832 km (0.093 R)
• M29: 8,044,027 km (0.093 R)
• M30: 8,858,288 km (0.09 R)
• M31: 9,938,535 km (0.104 R)
• M32: 10,917,503 km (0.083 R)
• M33: 11,890,488 km (0.065 R)
• M34: 12,480,202 km (0.109 R)
• M35: 13,306,431 km (0.07 R)
• M36: 13,420,575 km (0.064 R)
• M37: 13,918,586 km (0.059 R)
• M38: 14,034,375 km (0.106 R)
• M39: 14,266,850 km (0.06 R)
• M40: 14,383,536 km (0.118 R)
• M41: 15,209,765 km (0.081 R)
• M42: 15,408,730 km (0.082 R)
• M43: 15,648,685 km (0.047 R)
• M44: 16,702,602 km (0.107 R)
• M45: 16,948,990 km (0.112 R)
• M46: 17,404,067 km (0.083 R)
• M47: 17,653,895 km (0.06 R)
• M48: 18,157,142 km (0.087 R)
• M49: 18,453,047 km (0.072 R)
• M50: 19,436,055 km (0.116 R)
• M51: 19,565,606 km (0.049 R)
• M52: 20,392,284 km (0.097 R)
• M53: 20,964,646 km (0.049 R)
• M54: 21,230,481 km (0.047 R)
• M55: 22,305,342 km (0.078 R)
• M56: 22,622,040 km (0.108 R)
• M57: 22,758,324 km (0.116 R)
• M58: 22,940,385 km (0.1 R)
• M59: 24,135,672 km (0.114 R)
• M60: 24,507,422 km (0.108 R)
• M61: 24,694,121 km (0.077 R)
• M62: 24,834,443 km (0.108 R)
• M63: 25,303,881 km (0.102 R)
• M64: 25,634,343 km (0.111 R)
• M65: 27,987,069 km (0.084 R)
• M66: 28,182,294 km (0.109 R)
• M67: 28,377,818 km (0.08 R)
• M68: 28,671,928 km (0.11 R)
• M69: 30,608,622 km (0.12 R)
• M70: 31,719,685 km (0.112 R)
• M71: 32,076,027 km (0.107 R)
• M72: 32,382,404 km (0.118 R)
• M73: 32,689,828 km (0.112 R)
• M74: 34,137,187 km (0.097 R)
• M75: 34,397,936 km (0.106 R)
• M76: 34,502,355 km (0.1 R)
• M77: 34,711,493 km (0.111 R)

Planet 8 - Gas Giant

Semi-Major Axis: 11.93 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 277.2

Radius: 8.5

Gravity: 3.84 G

Time & Orbit

Eccentricity (e): 0.11

Orbit Range: 10.62 AU - 13.24 AU

Year: 14482 Days

Day: 7.9 Hours

Environment

Temp: -182 °C

Axial Tilt: 35.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (64)

Outer Limit: 65,960,752 km

• M1: 263,591 km (0.079 R)
• M2: 329,265 km (0.106 R)
• M3: 402,119 km (0.102 R)
• M4: 2,106,637 km (0.093 R)
• M5: 2,179,192 km (0.059 R)
• M6: 3,420,406 km (0.103 R)
• M7: 3,505,976 km (0.097 R)
• M8: 4,125,161 km (0.095 R)
• M9: 5,165,315 km (0.074 R)
• M10: 5,263,751 km (0.074 R)
• M11: 6,004,709 km (0.102 R)
• M12: 6,493,296 km (0.058 R)
• M13: 7,140,157 km (0.1 R)
• M14: 7,545,567 km (0.062 R)
• M15: 8,186,743 km (0.093 R)
• M16: 8,417,274 km (0.118 R)
• M17: 8,806,228 km (0.089 R)
• M18: 8,884,767 km (0.094 R)
• M19: 10,008,098 km (0.117 R)
• M20: 11,048,551 km (0.063 R)
• M21: 11,388,736 km (0.085 R)
• M22: 12,254,160 km (0.117 R)
• M23: 12,562,032 km (0.102 R)
• M24: 13,185,556 km (0.113 R)
• M25: 14,277,770 km (0.052 R)
• M26: 15,021,870 km (0.085 R)
• M27: 16,402,659 km (0.07 R)
• M28: 17,329,118 km (0.118 R)
• M29: 18,222,517 km (0.057 R)
• M30: 19,539,127 km (0.061 R)
• M31: 19,795,837 km (0.101 R)
• M32: 20,729,328 km (0.102 R)
• M33: 21,677,031 km (0.059 R)
• M34: 21,783,096 km (0.096 R)
• M35: 22,423,823 km (0.117 R)
• M36: 22,908,371 km (0.093 R)
• M37: 23,233,447 km (0.074 R)
• M38: 23,723,679 km (0.045 R)
• M39: 24,659,264 km (0.04 R)
• M40: 24,936,619 km (0.092 R)
• M41: 26,622,886 km (0.083 R)
• M42: 26,793,577 km (0.086 R)
• M43: 26,907,571 km (0.087 R)
• M44: 27,250,449 km (0.094 R)
• M45: 27,594,823 km (0.04 R)
• M46: 28,113,928 km (0.07 R)
• M47: 28,869,547 km (0.069 R)
• M48: 29,220,653 km (0.107 R)
• M49: 29,985,996 km (0.091 R)
• M50: 30,698,381 km (0.109 R)
• M51: 30,996,828 km (0.101 R)
• M52: 33,664,607 km (0.077 R)
• M53: 34,342,884 km (0.086 R)
• M54: 37,673,980 km (0.098 R)
• M55: 37,929,643 km (0.086 R)
• M56: 39,022,156 km (0.069 R)
• M57: 40,451,414 km (0.103 R)
• M58: 41,238,149 km (0.109 R)
• M59: 41,501,591 km (0.092 R)
• M60: 42,427,901 km (0.043 R)
• M61: 42,560,744 km (0.117 R)
• M62: 43,093,611 km (0.112 R)
• M63: 43,360,943 km (0.075 R)
• M64: 45,247,222 km (0.117 R)

Planet 9 - Ice Giant

Semi-Major Axis: 18.19 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 240.1

Radius: 4.2

Gravity: 13.61 G

Time & Orbit

Eccentricity (e): 0.104

Orbit Range: 16.3 AU - 20.08 AU

Year: 27266 Days

Day: 17.4 Hours

Environment

Temp: -198 °C

Axial Tilt: 7.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (94)

Outer Limit: 65,960,752 km

• M1: 68,965 km (0.099 R)
• M2: 128,205 km (0.08 R)
• M3: 429,495 km (0.094 R)
• M4: 502,350 km (0.113 R)
• M5: 723,754 km (0.058 R)
• M6: 949,198 km (0.09 R)
• M7: 1,352,215 km (0.077 R)
• M8: 1,685,519 km (0.105 R)
• M9: 2,074,174 km (0.116 R)
• M10: 2,424,084 km (0.073 R)
• M11: 2,522,669 km (0.108 R)
• M12: 2,589,090 km (0.105 R)
• M13: 2,791,945 km (0.108 R)
• M14: 3,035,191 km (0.091 R)
• M15: 3,105,951 km (0.118 R)
• M16: 3,321,372 km (0.102 R)
• M17: 4,074,148 km (0.081 R)
• M18: 4,550,169 km (0.112 R)
• M19: 4,794,761 km (0.065 R)
• M20: 4,877,190 km (0.085 R)
• M21: 5,043,543 km (0.103 R)
• M22: 5,085,430 km (0.096 R)
• M23: 5,127,467 km (0.075 R)
• M24: 6,440,188 km (0.061 R)
• M25: 7,180,399 km (0.119 R)
• M26: 7,369,640 km (0.096 R)
• M27: 9,145,217 km (0.095 R)
• M28: 9,299,004 km (0.065 R)
• M29: 9,660,881 km (0.069 R)
• M30: 10,505,211 km (0.12 R)
• M31: 12,207,336 km (0.098 R)
• M32: 12,660,318 km (0.115 R)
• M33: 13,176,431 km (0.109 R)
• M34: 13,408,008 km (0.034 R)
• M35: 14,466,862 km (0.066 R)
• M36: 14,586,092 km (0.104 R)
• M37: 14,825,598 km (0.055 R)
• M38: 15,735,602 km (0.109 R)
• M39: 16,414,327 km (0.109 R)
• M40: 16,476,410 km (0.07 R)
• M41: 18,636,454 km (0.049 R)
• M42: 18,896,305 km (0.061 R)
• M43: 20,080,821 km (0.074 R)
• M44: 22,936,196 km (0.027 R)
• M45: 24,269,113 km (0.104 R)
• M46: 25,915,886 km (0.075 R)
• M47: 25,988,292 km (0.114 R)
• M48: 27,155,903 km (0.102 R)
• M49: 27,450,611 km (0.117 R)
• M50: 29,089,755 km (0.045 R)
• M51: 29,315,648 km (0.092 R)
• M52: 29,542,288 km (0.112 R)
• M53: 30,377,942 km (0.098 R)
• M54: 32,774,500 km (0.083 R)
• M55: 32,931,129 km (0.086 R)
• M56: 34,591,366 km (0.041 R)
• M57: 36,521,927 km (0.098 R)
• M58: 36,603,009 km (0.101 R)
• M59: 37,500,147 km (0.117 R)
• M60: 37,582,127 km (0.102 R)
• M61: 37,828,215 km (0.078 R)
• M62: 39,149,763 km (0.068 R)
• M63: 40,066,947 km (0.044 R)
• M64: 40,318,421 km (0.094 R)
• M65: 40,486,270 km (0.105 R)
• M66: 40,907,089 km (0.086 R)
• M67: 42,177,923 km (0.1 R)
• M68: 42,689,996 km (0.082 R)
• M69: 43,547,791 km (0.092 R)
• M70: 45,455,163 km (0.105 R)
• M71: 45,804,774 km (0.099 R)
• M72: 47,655,299 km (0.107 R)
• M73: 48,366,787 km (0.065 R)
• M74: 48,902,497 km (0.072 R)
• M75: 49,889,992 km (0.113 R)
• M76: 49,980,050 km (0.118 R)
• M77: 50,974,726 km (0.078 R)
• M78: 51,338,100 km (0.116 R)
• M79: 51,884,581 km (0.105 R)
• M80: 52,524,710 km (0.12 R)
• M81: 52,616,264 km (0.037 R)
• M82: 53,351,537 km (0.074 R)
• M83: 53,443,690 km (0.112 R)
• M84: 53,997,501 km (0.094 R)
• M85: 54,831,958 km (0.08 R)
• M86: 55,764,102 km (0.08 R)
• M87: 59,449,147 km (0.03 R)
• M88: 59,927,261 km (0.087 R)
• M89: 60,310,681 km (0.057 R)
• M90: 60,406,723 km (0.106 R)
• M91: 60,791,040 km (0.082 R)
• M92: 63,993,481 km (0.114 R)
• M93: 64,287,291 km (0.12 R)
• M94: 64,974,544 km (0.106 R)

Kuiper Belt

Range: 31.2 - 58.2 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 479 - 12,642 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit