🌌 Stone's Star System Generator

Planet 1 - Terrestrial

Semi-Major Axis: 1.21 AU

Status: HZ

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 2.73

Radius: 1.49

Gravity: 1.23 G

Time & Orbit

Eccentricity (e): 0.123

Orbit Range: 1.06 AU - 1.36 AU

Year: 489 Days

Day: 25.4 Hours

Environment

Temp: 16 °C

Axial Tilt: 23.4 °

Atmosphere: N₂, O₂

Biome: Arid/Tundra

Planet 2 - Terrestrial

Semi-Major Axis: 2.9 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 3.24

Radius: 1.6

Gravity: 1.27 G

Time & Orbit

Eccentricity (e): 0.094

Orbit Range: 2.63 AU - 3.17 AU

Year: 1813 Days

Day: 36.3 Hours

Environment

Temp: -99 °C

Axial Tilt: 7.6 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Planet 3 - Terrestrial

Semi-Major Axis: 3.35 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 0.81

Radius: 0.92

Gravity: 0.96 G

Time & Orbit

Eccentricity (e): 0.063

Orbit Range: 3.14 AU - 3.56 AU

Year: 2251 Days

Day: 42.2 Hours

Environment

Temp: -107 °C

Axial Tilt: 25.9 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Planet 4 - Gas Giant

Semi-Major Axis: 4.87 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 812.2

Radius: 14.3

Gravity: 3.97 G

Time & Orbit

Eccentricity (e): 0.12

Orbit Range: 4.29 AU - 5.45 AU

Year: 3945 Days

Day: 8.9 Hours

Environment

Temp: -142 °C

Axial Tilt: 25.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (72)

Outer Limit: 94,303,664 km

• M1: 178,769 km (0.08 R)
• M2: 471,981 km (0.081 R)
• M3: 627,114 km (0.028 R)
• M4: 734,675 km (0.092 R)
• M5: 885,619 km (0.087 R)
• M6: 984,204 km (0.076 R)
• M7: 1,194,090 km (0.083 R)
• M8: 1,290,880 km (0.04 R)
• M9: 1,582,895 km (0.09 R)
• M10: 1,674,748 km (0.116 R)
• M11: 1,896,751 km (0.108 R)
• M12: 2,078,214 km (0.099 R)
• M13: 2,265,660 km (0.097 R)
• M14: 2,805,558 km (0.064 R)
• M15: 2,918,505 km (0.092 R)
• M16: 3,266,470 km (0.101 R)
• M17: 3,425,492 km (0.085 R)
• M18: 3,669,037 km (0.086 R)
• M19: 4,281,192 km (0.091 R)
• M20: 5,317,456 km (0.057 R)
• M21: 5,648,068 km (0.056 R)
• M22: 5,912,407 km (0.088 R)
• M23: 6,131,867 km (0.101 R)
• M24: 6,553,883 km (0.081 R)
• M25: 7,504,876 km (0.068 R)
• M26: 7,769,365 km (0.105 R)
• M27: 8,171,933 km (0.083 R)
• M28: 8,857,989 km (0.112 R)
• M29: 9,109,613 km (0.041 R)
• M30: 9,477,324 km (0.076 R)
• M31: 9,705,910 km (0.065 R)
• M32: 9,936,440 km (0.059 R)
• M33: 10,491,149 km (0.082 R)
• M34: 10,668,572 km (0.105 R)
• M35: 12,246,680 km (0.102 R)
• M36: 12,967,891 km (0.111 R)
• M37: 13,285,787 km (0.042 R)
• M38: 13,509,735 km (0.117 R)
• M39: 13,606,226 km (0.101 R)
• M40: 13,702,866 km (0.079 R)
• M41: 15,046,554 km (0.091 R)
• M42: 15,179,995 km (0.118 R)
• M43: 15,280,226 km (0.098 R)
• M44: 15,548,754 km (0.087 R)
• M45: 16,192,623 km (0.084 R)
• M46: 16,397,871 km (0.059 R)
• M47: 16,707,240 km (0.115 R)
• M48: 16,845,319 km (0.087 R)
• M49: 17,018,553 km (0.096 R)
• M50: 18,105,531 km (0.076 R)
• M51: 18,926,524 km (0.091 R)
• M52: 19,251,152 km (0.043 R)
• M53: 19,650,428 km (0.097 R)
• M54: 19,979,095 km (0.119 R)
• M55: 20,530,961 km (0.094 R)
• M56: 20,679,063 km (0.067 R)
• M57: 20,827,464 km (0.042 R)
• M58: 20,976,165 km (0.065 R)
• M59: 21,162,564 km (0.084 R)
• M60: 21,838,297 km (0.072 R)
• M61: 22,482,914 km (0.107 R)
• M62: 22,635,504 km (0.044 R)
• M63: 22,750,246 km (0.046 R)
• M64: 23,752,252 km (0.112 R)
• M65: 25,044,628 km (0.043 R)
• M66: 25,321,833 km (0.098 R)
• M67: 25,440,763 km (0.105 R)
• M68: 25,679,522 km (0.1 R)
• M69: 26,159,132 km (0.089 R)
• M70: 26,279,559 km (0.089 R)
• M71: 26,601,493 km (0.112 R)
• M72: 27,289,943 km (0.108 R)

Planet 5 - Gas Giant

Semi-Major Axis: 5.11 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 966

Radius: 12.6

Gravity: 6.08 G

Time & Orbit

Eccentricity (e): 0.068

Orbit Range: 4.76 AU - 5.46 AU

Year: 4240 Days

Day: 6.5 Hours

Environment

Temp: -135 °C

Axial Tilt: 11.8 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (74)

Outer Limit: 94,303,664 km

• M1: 161,715 km (0.098 R)
• M2: 255,214 km (0.107 R)
• M3: 371,452 km (0.067 R)
• M4: 801,545 km (0.083 R)
• M5: 891,454 km (0.082 R)
• M6: 985,252 km (0.061 R)
• M7: 1,111,063 km (0.094 R)
• M8: 1,257,819 km (0.106 R)
• M9: 1,687,165 km (0.071 R)
• M10: 2,161,240 km (0.096 R)
• M11: 2,538,825 km (0.048 R)
• M12: 2,656,409 km (0.109 R)
• M13: 2,896,813 km (0.099 R)
• M14: 3,529,463 km (0.091 R)
• M15: 3,861,719 km (0.029 R)
• M16: 3,974,815 km (0.069 R)
• M17: 4,391,146 km (0.099 R)
• M18: 4,509,329 km (0.108 R)
• M19: 4,870,159 km (0.112 R)
• M20: 4,992,679 km (0.081 R)
• M21: 5,190,747 km (0.082 R)
• M22: 5,416,640 km (0.081 R)
• M23: 5,671,554 km (0.091 R)
• M24: 6,540,718 km (0.074 R)
• M25: 6,648,877 km (0.096 R)
• M26: 7,310,698 km (0.094 R)
• M27: 7,479,445 km (0.058 R)
• M28: 7,878,273 km (0.071 R)
• M29: 8,138,423 km (0.088 R)
• M30: 8,313,453 km (0.071 R)
• M31: 8,667,102 km (0.107 R)
• M32: 8,935,780 km (0.103 R)
• M33: 9,207,001 km (0.054 R)
• M34: 9,603,884 km (0.1 R)
• M35: 9,943,920 km (0.079 R)
• M36: 10,162,483 km (0.088 R)
• M37: 10,351,125 km (0.096 R)
• M38: 10,731,852 km (0.074 R)
• M39: 10,891,772 km (0.11 R)
• M40: 11,506,919 km (0.083 R)
• M41: 11,637,966 km (0.074 R)
• M42: 12,400,616 km (0.063 R)
• M43: 12,838,938 km (0.049 R)
• M44: 13,111,057 km (0.115 R)
• M45: 13,247,939 km (0.081 R)
• M46: 13,419,677 km (0.026 R)
• M47: 13,592,163 km (0.106 R)
• M48: 13,904,524 km (0.097 R)
• M49: 14,219,128 km (0.118 R)
• M50: 15,105,645 km (0.077 R)
• M51: 15,682,494 km (0.111 R)
• M52: 15,864,106 km (0.087 R)
• M53: 16,339,977 km (0.098 R)
• M54: 16,635,134 km (0.092 R)
• M55: 17,193,134 km (0.112 R)
• M56: 17,380,580 km (0.092 R)
• M57: 17,795,265 km (0.096 R)
• M58: 18,251,539 km (0.078 R)
• M59: 19,136,560 km (0.116 R)
• M60: 19,760,532 km (0.076 R)
• M61: 20,589,604 km (0.081 R)
• M62: 21,470,436 km (0.081 R)
• M63: 21,874,799 km (0.093 R)
• M64: 22,609,175 km (0.032 R)
• M65: 23,020,569 km (0.042 R)
• M66: 23,892,725 km (0.071 R)
• M67: 25,157,425 km (0.105 R)
• M68: 25,370,303 km (0.115 R)
• M69: 25,926,657 km (0.093 R)
• M70: 26,964,268 km (0.095 R)
• M71: 28,059,624 km (0.073 R)
• M72: 28,236,149 km (0.084 R)
• M73: 28,501,686 km (0.1 R)
• M74: 30,293,569 km (0.072 R)

Planet 6 - Gas Giant

Semi-Major Axis: 10.56 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 735.7

Radius: 9

Gravity: 9.08 G

Time & Orbit

Eccentricity (e): 0.078

Orbit Range: 9.74 AU - 11.38 AU

Year: 12597 Days

Day: 9.9 Hours

Environment

Temp: -180 °C

Axial Tilt: 170.7 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (87)

Outer Limit: 94,303,664 km

• M1: 196,572 km (0.109 R)
• M2: 454,478 km (0.028 R)
• M3: 869,164 km (0.11 R)
• M4: 1,125,275 km (0.105 R)
• M5: 1,629,121 km (0.028 R)
• M6: 1,811,630 km (0.099 R)
• M7: 2,852,383 km (0.117 R)
• M8: 3,169,680 km (0.112 R)
• M9: 3,734,860 km (0.05 R)
• M10: 4,585,324 km (0.036 R)
• M11: 4,919,376 km (0.118 R)
• M12: 7,383,852 km (0.085 R)
• M13: 7,819,182 km (0.062 R)
• M14: 9,128,462 km (0.105 R)
• M15: 9,221,213 km (0.116 R)
• M16: 9,407,761 km (0.085 R)
• M17: 10,022,609 km (0.055 R)
• M18: 10,601,851 km (0.102 R)
• M19: 12,352,147 km (0.048 R)
• M20: 13,024,888 km (0.088 R)
• M21: 14,622,444 km (0.069 R)
• M22: 15,499,536 km (0.062 R)
• M23: 15,665,889 km (0.109 R)
• M24: 17,534,516 km (0.073 R)
• M25: 17,765,794 km (0.107 R)
• M26: 18,231,343 km (0.083 R)
• M27: 18,348,478 km (0.073 R)
• M28: 18,524,405 km (0.093 R)
• M29: 19,234,097 km (0.094 R)
• M30: 20,012,904 km (0.079 R)
• M31: 20,133,629 km (0.065 R)
• M32: 20,194,067 km (0.12 R)
• M33: 20,863,069 km (0.063 R)
• M34: 21,231,079 km (0.074 R)
• M35: 21,477,617 km (0.119 R)
• M36: 21,725,052 km (0.051 R)
• M37: 21,849,218 km (0.048 R)
• M38: 22,724,515 km (0.102 R)
• M39: 23,293,136 km (0.069 R)
• M40: 23,547,453 km (0.077 R)
• M41: 24,315,788 km (0.029 R)
• M42: 25,680,120 km (0.057 R)
• M43: 26,008,637 km (0.083 R)
• M44: 26,736,131 km (0.114 R)
• M45: 27,002,416 km (0.1 R)
• M46: 27,069,136 km (0.113 R)
• M47: 27,269,597 km (0.075 R)
• M48: 27,537,527 km (0.067 R)
• M49: 27,604,697 km (0.092 R)
• M50: 28,211,466 km (0.084 R)
• M51: 29,232,322 km (0.043 R)
• M52: 29,369,353 km (0.119 R)
• M53: 29,712,830 km (0.086 R)
• M54: 29,850,610 km (0.069 R)
• M55: 29,988,688 km (0.097 R)
• M56: 33,006,526 km (0.092 R)
• M57: 33,578,588 km (0.059 R)
• M58: 33,722,202 km (0.101 R)
• M59: 33,937,923 km (0.042 R)
• M60: 34,298,304 km (0.08 R)
• M61: 35,460,380 km (0.08 R)
• M62: 35,606,537 km (0.119 R)
• M63: 37,079,328 km (0.087 R)
• M64: 39,098,750 km (0.101 R)
• M65: 39,249,844 km (0.054 R)
• M66: 40,388,583 km (0.082 R)
• M67: 40,541,322 km (0.077 R)
• M68: 41,384,306 km (0.054 R)
• M69: 41,692,328 km (0.026 R)
• M70: 42,078,440 km (0.099 R)
• M71: 42,543,241 km (0.103 R)
• M72: 43,869,576 km (0.074 R)
• M73: 44,340,958 km (0.086 R)
• M74: 46,083,624 km (0.073 R)
• M75: 46,802,891 km (0.089 R)
• M76: 47,204,112 km (0.087 R)
• M77: 48,252,793 km (0.075 R)
• M78: 48,901,749 km (0.101 R)
• M79: 49,799,037 km (0.101 R)
• M80: 50,537,153 km (0.101 R)
• M81: 50,783,989 km (0.096 R)
• M82: 51,031,274 km (0.083 R)
• M83: 55,210,590 km (0.032 R)
• M84: 55,379,935 km (0.116 R)
• M85: 56,059,558 km (0.1 R)
• M86: 56,656,304 km (0.083 R)
• M87: 56,998,434 km (0.119 R)

Planet 7 - Ice Giant

Semi-Major Axis: 13.08 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 210.8

Radius: 7.9

Gravity: 3.38 G

Time & Orbit

Eccentricity (e): 0.111

Orbit Range: 11.63 AU - 14.53 AU

Year: 17365 Days

Day: 22.6 Hours

Environment

Temp: -184 °C

Axial Tilt: 25.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (86)

Outer Limit: 94,303,664 km

• M1: 261,048 km (0.075 R)
• M2: 619,934 km (0.085 R)
• M3: 716,574 km (0.084 R)
• M4: 835,953 km (0.111 R)
• M5: 1,018,462 km (0.116 R)
• M6: 1,134,251 km (0.038 R)
• M7: 1,274,873 km (0.103 R)
• M8: 1,442,871 km (0.066 R)
• M9: 1,731,147 km (0.102 R)
• M10: 1,870,422 km (0.083 R)
• M11: 2,013,438 km (0.086 R)
• M12: 2,160,193 km (0.051 R)
• M13: 3,196,906 km (0.114 R)
• M14: 3,810,707 km (0.113 R)
• M15: 4,084,919 km (0.104 R)
• M16: 4,146,703 km (0.113 R)
• M17: 5,515,374 km (0.095 R)
• M18: 5,790,784 km (0.094 R)
• M19: 5,930,209 km (0.115 R)
• M20: 6,070,682 km (0.037 R)
• M21: 6,571,236 km (0.078 R)
• M22: 6,973,804 km (0.113 R)
• M23: 7,535,694 km (0.06 R)
• M24: 8,268,125 km (0.082 R)
• M25: 8,902,569 km (0.059 R)
• M26: 9,225,701 km (0.111 R)
• M27: 10,217,834 km (0.087 R)
• M28: 10,683,831 km (0.087 R)
• M29: 10,984,074 km (0.098 R)
• M30: 11,548,956 km (0.063 R)
• M31: 12,034,251 km (0.116 R)
• M32: 12,661,665 km (0.095 R)
• M33: 13,715,282 km (0.085 R)
• M34: 14,229,001 km (0.114 R)
• M35: 14,323,099 km (0.1 R)
• M36: 14,464,768 km (0.097 R)
• M37: 15,227,418 km (0.115 R)
• M38: 15,371,929 km (0.119 R)
• M39: 16,742,096 km (0.067 R)
• M40: 17,040,843 km (0.067 R)
• M41: 18,304,197 km (0.116 R)
• M42: 18,457,834 km (0.066 R)
• M43: 18,560,608 km (0.115 R)
• M44: 18,921,438 km (0.119 R)
• M45: 20,123,158 km (0.068 R)
• M46: 20,175,966 km (0.117 R)
• M47: 20,228,923 km (0.08 R)
• M48: 21,998,965 km (0.08 R)
• M49: 22,709,854 km (0.08 R)
• M50: 23,428,223 km (0.119 R)
• M51: 23,539,375 km (0.106 R)
• M52: 24,717,308 km (0.108 R)
• M53: 24,774,006 km (0.105 R)
• M54: 26,317,706 km (0.06 R)
• M55: 26,375,451 km (0.119 R)
• M56: 26,433,345 km (0.097 R)
• M57: 27,188,665 km (0.077 R)
• M58: 27,657,206 km (0.076 R)
• M59: 28,542,526 km (0.102 R)
• M60: 28,780,237 km (0.083 R)
• M61: 29,018,696 km (0.113 R)
• M62: 29,437,420 km (0.047 R)
• M63: 29,978,665 km (0.07 R)
• M64: 30,888,071 km (0.102 R)
• M65: 31,193,101 km (0.072 R)
• M66: 31,254,286 km (0.075 R)
• M67: 31,315,472 km (0.109 R)
• M68: 31,499,328 km (0.057 R)
• M69: 32,176,408 km (0.093 R)
• M70: 32,423,693 km (0.082 R)
• M71: 32,796,042 km (0.099 R)
• M72: 33,169,737 km (0.119 R)
• M73: 35,313,774 km (0.084 R)
• M74: 36,209,566 km (0.1 R)
• M75: 36,789,408 km (0.083 R)
• M76: 37,372,390 km (0.116 R)
• M77: 39,867,085 km (0.114 R)
• M78: 41,671,983 km (0.11 R)
• M79: 43,026,143 km (0.116 R)
• M80: 44,051,187 km (0.043 R)
• M81: 44,119,853 km (0.11 R)
• M82: 44,257,184 km (0.081 R)
• M83: 45,015,196 km (0.103 R)
• M84: 46,055,649 km (0.101 R)
• M85: 46,264,637 km (0.096 R)
• M86: 46,474,075 km (0.099 R)

Planet 8 - Ice Giant

Semi-Major Axis: 16.19 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 912.2

Radius: 5

Gravity: 36.49 G

Time & Orbit

Eccentricity (e): 0.039

Orbit Range: 15.56 AU - 16.82 AU

Year: 23913 Days

Day: 15.9 Hours

Environment

Temp: -197 °C

Axial Tilt: 31.3 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (95)

Outer Limit: 94,303,664 km

• M1: 105,915 km (0.07 R)
• M2: 271,071 km (0.1 R)
• M3: 309,069 km (0.074 R)
• M4: 961,765 km (0.113 R)
• M5: 1,053,319 km (0.057 R)
• M6: 2,275,084 km (0.118 R)
• M7: 2,438,894 km (0.09 R)
• M8: 2,734,948 km (0.039 R)
• M9: 2,778,182 km (0.114 R)
• M10: 3,087,102 km (0.113 R)
• M11: 3,314,490 km (0.114 R)
• M12: 4,788,777 km (0.066 R)
• M13: 4,946,005 km (0.079 R)
• M14: 5,373,705 km (0.113 R)
• M15: 5,537,066 km (0.112 R)
• M16: 5,924,824 km (0.107 R)
• M17: 6,037,172 km (0.057 R)
• M18: 7,319,225 km (0.074 R)
• M19: 8,554,754 km (0.119 R)
• M20: 8,745,492 km (0.025 R)
• M21: 9,654,598 km (0.105 R)
• M22: 11,004,419 km (0.095 R)
• M23: 11,490,762 km (0.098 R)
• M24: 13,283,842 km (0.119 R)
• M25: 13,431,046 km (0.12 R)
• M26: 13,801,451 km (0.118 R)
• M27: 14,174,997 km (0.086 R)
• M28: 14,400,889 km (0.106 R)
• M29: 14,779,821 km (0.102 R)
• M30: 15,702,690 km (0.11 R)
• M31: 16,962,005 km (0.078 R)
• M32: 18,253,334 km (0.115 R)
• M33: 18,416,994 km (0.092 R)
• M34: 19,325,801 km (0.086 R)
• M35: 21,272,368 km (0.113 R)
• M36: 24,262,082 km (0.097 R)
• M37: 24,351,990 km (0.056 R)
• M38: 25,805,483 km (0.088 R)
• M39: 26,821,103 km (0.094 R)
• M40: 27,755,491 km (0.097 R)
• M41: 28,890,939 km (0.103 R)
• M42: 29,177,120 km (0.117 R)
• M43: 29,752,473 km (0.085 R)
• M44: 31,109,176 km (0.066 R)
• M45: 31,696,797 km (0.111 R)
• M46: 33,882,571 km (0.081 R)
• M47: 34,285,289 km (0.11 R)
• M48: 35,298,665 km (0.041 R)
• M49: 35,706,917 km (0.04 R)
• M50: 35,809,093 km (0.03 R)
• M51: 36,116,516 km (0.079 R)
• M52: 37,770,919 km (0.086 R)
• M53: 39,449,856 km (0.105 R)
• M54: 39,873,368 km (0.063 R)
• M55: 40,192,011 km (0.094 R)
• M56: 41,260,140 km (0.114 R)
• M57: 41,690,084 km (0.12 R)
• M58: 42,445,853 km (0.068 R)
• M59: 43,315,315 km (0.077 R)
• M60: 43,752,141 km (0.11 R)
• M61: 43,861,647 km (0.12 R)
• M62: 43,971,153 km (0.074 R)
• M63: 44,961,191 km (0.102 R)
• M64: 45,736,258 km (0.096 R)
• M65: 46,069,861 km (0.094 R)
• M66: 46,181,162 km (0.114 R)
• M67: 51,630,264 km (0.092 R)
• M68: 53,374,276 km (0.057 R)
• M69: 54,194,821 km (0.103 R)
• M70: 56,204,668 km (0.115 R)
• M71: 59,083,529 km (0.076 R)
• M72: 59,325,579 km (0.092 R)
• M73: 60,418,840 km (0.118 R)
• M74: 60,540,762 km (0.086 R)
• M75: 61,273,792 km (0.117 R)
• M76: 63,614,550 km (0.093 R)
• M77: 66,361,167 km (0.07 R)
• M78: 67,622,426 km (0.056 R)
• M79: 68,129,114 km (0.088 R)
• M80: 69,273,688 km (0.099 R)
• M81: 70,681,404 km (0.114 R)
• M82: 71,195,571 km (0.042 R)
• M83: 71,453,179 km (0.029 R)
• M84: 72,357,199 km (0.053 R)
• M85: 75,879,182 km (0.088 R)
• M86: 77,594,770 km (0.111 R)
• M87: 79,991,178 km (0.118 R)
• M88: 80,929,606 km (0.114 R)
• M89: 81,602,198 km (0.091 R)
• M90: 84,038,848 km (0.049 R)
• M91: 87,186,836 km (0.105 R)
• M92: 88,014,411 km (0.048 R)
• M93: 90,931,420 km (0.066 R)
• M94: 91,490,617 km (0.073 R)
• M95: 93,456,782 km (0.106 R)

Kuiper Belt

Range: 30 - 52 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 537 - 11,165 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit