🌌 Stone's Star System Generator

Planet 1 - Terrestrial

Semi-Major Axis: 1.18 AU

Status: HZ

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 0.19

Radius: 0.51

Gravity: 0.73 G

Time & Orbit

Eccentricity (e): 0.203

Orbit Range: 0.94 AU - 1.42 AU

Year: 478 Days

Day: 33.8 Hours

Environment

Temp: -15 °C

Axial Tilt: 14.8 °

Atmosphere: N₂, O₂

Biome: Arid/Tundra

Planet 2 - Terrestrial

Semi-Major Axis: 2.28 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 2.24

Radius: 1.38

Gravity: 1.18 G

Time & Orbit

Eccentricity (e): 0.047

Orbit Range: 2.17 AU - 2.39 AU

Year: 1283 Days

Day: 47 Hours

Environment

Temp: -81 °C

Axial Tilt: 39.9 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Planet 3 - Terrestrial

Semi-Major Axis: 2.68 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 3.72

Radius: 1.69

Gravity: 1.3 G

Time & Orbit

Eccentricity (e): 0.031

Orbit Range: 2.6 AU - 2.76 AU

Year: 1636 Days

Day: 16.6 Hours

Environment

Temp: -89 °C

Axial Tilt: 49 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Satellites (1)

Outer Limit: 92,600,764 km

• M1: 695,331 km (0.066 R)

Planet 4 - Gas Giant

Semi-Major Axis: 4.5 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 678.4

Radius: 10

Gravity: 6.78 G

Time & Orbit

Eccentricity (e): 0.08

Orbit Range: 4.14 AU - 4.86 AU

Year: 3559 Days

Day: 5.7 Hours

Environment

Temp: -134 °C

Axial Tilt: 22.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (78)

Outer Limit: 92,600,764 km

• M1: 197,020 km (0.101 R)
• M2: 274,063 km (0.117 R)
• M3: 359,783 km (0.105 R)
• M4: 432,188 km (0.085 R)
• M5: 595,100 km (0.057 R)
• M6: 726,298 km (0.07 R)
• M7: 1,019,061 km (0.108 R)
• M8: 1,091,915 km (0.089 R)
• M9: 1,361,341 km (0.115 R)
• M10: 2,148,076 km (0.084 R)
• M11: 2,323,554 km (0.045 R)
• M12: 2,470,758 km (0.094 R)
• M13: 2,654,764 km (0.073 R)
• M14: 3,125,848 km (0.102 R)
• M15: 3,197,804 km (0.049 R)
• M16: 3,270,509 km (0.109 R)
• M17: 3,362,063 km (0.066 R)
• M18: 3,909,890 km (0.049 R)
• M19: 3,987,681 km (0.095 R)
• M20: 4,814,658 km (0.06 R)
• M21: 5,024,394 km (0.088 R)
• M22: 5,215,580 km (0.114 R)
• M23: 5,322,991 km (0.096 R)
• M24: 5,474,534 km (0.105 R)
• M25: 5,715,536 km (0.098 R)
• M26: 6,690,914 km (0.106 R)
• M27: 7,209,720 km (0.099 R)
• M28: 7,281,527 km (0.067 R)
• M29: 7,425,739 km (0.028 R)
• M30: 7,570,999 km (0.093 R)
• M31: 7,962,945 km (0.112 R)
• M32: 8,920,072 km (0.083 R)
• M33: 9,177,979 km (0.107 R)
• M34: 9,255,770 km (0.107 R)
• M35: 9,648,464 km (0.096 R)
• M36: 9,833,517 km (0.104 R)
• M37: 9,939,881 km (0.07 R)
• M38: 10,368,928 km (0.117 R)
• M39: 10,450,010 km (0.118 R)
• M40: 11,106,595 km (0.092 R)
• M41: 11,495,848 km (0.082 R)
• M42: 11,776,644 km (0.061 R)
• M43: 11,889,590 km (0.082 R)
• M44: 12,145,103 km (0.062 R)
• M45: 12,690,238 km (0.084 R)
• M46: 13,184,958 km (0.103 R)
• M47: 13,597,100 km (0.077 R)
• M48: 13,685,961 km (0.091 R)
• M49: 14,013,431 km (0.097 R)
• M50: 14,524,607 km (0.045 R)
• M51: 14,645,781 km (0.092 R)
• M52: 14,736,886 km (0.077 R)
• M53: 14,889,177 km (0.065 R)
• M54: 15,195,254 km (0.103 R)
• M55: 15,380,007 km (0.099 R)
• M56: 16,000,988 km (0.046 R)
• M57: 16,063,520 km (0.082 R)
• M58: 16,503,637 km (0.077 R)
• M59: 16,630,047 km (0.077 R)
• M60: 16,820,336 km (0.085 R)
• M61: 16,947,644 km (0.06 R)
• M62: 17,235,320 km (0.105 R)
• M63: 17,299,348 km (0.089 R)
• M64: 17,427,853 km (0.058 R)
• M65: 17,880,087 km (0.061 R)
• M66: 18,075,163 km (0.07 R)
• M67: 18,172,850 km (0.11 R)
• M68: 18,961,381 km (0.109 R)
• M69: 19,326,399 km (0.08 R)
• M70: 19,526,561 km (0.11 R)
• M71: 20,367,900 km (0.065 R)
• M72: 20,912,586 km (0.09 R)
• M73: 21,565,580 km (0.093 R)
• M74: 22,120,588 km (0.12 R)
• M75: 22,260,163 km (0.064 R)
• M76: 22,399,888 km (0.09 R)
• M77: 22,575,067 km (0.118 R)
• M78: 23,457,844 km (0.065 R)

Planet 5 - Gas Giant

Semi-Major Axis: 4.5 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 436.7

Radius: 14.9

Gravity: 1.97 G

Time & Orbit

Eccentricity (e): 0.009

Orbit Range: 4.46 AU - 4.54 AU

Year: 3559 Days

Day: 5.1 Hours

Environment

Temp: -135 °C

Axial Tilt: 12.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (64)

Outer Limit: 92,600,764 km

• M1: 243,396 km (0.109 R)
• M2: 381,325 km (0.093 R)
• M3: 509,979 km (0.098 R)
• M4: 854,054 km (0.094 R)
• M5: 1,070,971 km (0.08 R)
• M6: 1,260,811 km (0.109 R)
• M7: 1,426,117 km (0.091 R)
• M8: 2,494,395 km (0.078 R)
• M9: 2,599,263 km (0.118 R)
• M10: 2,986,123 km (0.119 R)
• M11: 3,592,742 km (0.088 R)
• M12: 3,780,488 km (0.059 R)
• M13: 3,901,812 km (0.092 R)
• M14: 4,006,829 km (0.095 R)
• M15: 4,148,349 km (0.117 R)
• M16: 4,454,725 km (0.118 R)
• M17: 4,994,624 km (0.101 R)
• M18: 5,282,151 km (0.108 R)
• M19: 5,813,672 km (0.111 R)
• M20: 6,238,979 km (0.049 R)
• M21: 6,383,042 km (0.065 R)
• M22: 6,653,515 km (0.112 R)
• M23: 6,843,055 km (0.091 R)
• M24: 7,141,354 km (0.115 R)
• M25: 7,378,915 km (0.087 R)
• M26: 7,531,355 km (0.066 R)
• M27: 7,706,983 km (0.101 R)
• M28: 7,995,258 km (0.044 R)
• M29: 8,377,630 km (0.036 R)
• M30: 8,766,136 km (0.102 R)
• M31: 9,442,468 km (0.1 R)
• M32: 9,655,795 km (0.114 R)
• M33: 10,721,829 km (0.104 R)
• M34: 10,870,080 km (0.108 R)
• M35: 10,969,413 km (0.076 R)
• M36: 11,093,879 km (0.106 R)
• M37: 11,268,908 km (0.117 R)
• M38: 11,444,985 km (0.067 R)
• M39: 11,545,964 km (0.12 R)
• M40: 11,825,113 km (0.092 R)
• M41: 12,004,032 km (0.047 R)
• M42: 12,158,118 km (0.074 R)
• M43: 12,938,121 km (0.116 R)
• M44: 13,307,778 km (0.106 R)
• M45: 13,681,024 km (0.118 R)
• M46: 13,949,553 km (0.119 R)
• M47: 14,328,634 km (0.104 R)
• M48: 14,876,162 km (0.102 R)
• M49: 15,402,597 km (0.117 R)
• M50: 15,542,172 km (0.091 R)
• M51: 16,588,010 km (0.098 R)
• M52: 16,788,471 km (0.055 R)
• M53: 17,133,893 km (0.064 R)
• M54: 17,249,682 km (0.092 R)
• M55: 17,452,686 km (0.098 R)
• M56: 17,598,245 km (0.058 R)
• M57: 17,773,424 km (0.077 R)
• M58: 18,096,256 km (0.071 R)
• M59: 18,391,263 km (0.1 R)
• M60: 18,539,365 km (0.109 R)
• M61: 19,617,666 km (0.073 R)
• M62: 19,829,796 km (0.056 R)
• M63: 20,073,042 km (0.076 R)
• M64: 20,593,344 km (0.083 R)

Planet 6 - Gas Giant

Semi-Major Axis: 4.6 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 386.9

Radius: 9.8

Gravity: 4.03 G

Time & Orbit

Eccentricity (e): 0.064

Orbit Range: 4.31 AU - 4.89 AU

Year: 3678 Days

Day: 14.3 Hours

Environment

Temp: -130 °C

Axial Tilt: 17 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (78)

Outer Limit: 92,600,764 km

• M1: 122,521 km (0.063 R)
• M2: 197,020 km (0.099 R)
• M3: 271,670 km (0.108 R)
• M4: 411,544 km (0.078 R)
• M5: 488,287 km (0.077 R)
• M6: 1,102,536 km (0.077 R)
• M7: 1,391,559 km (0.117 R)
• M8: 1,476,830 km (0.115 R)
• M9: 1,564,046 km (0.089 R)
• M10: 1,876,107 km (0.108 R)
• M11: 2,236,638 km (0.081 R)
• M12: 2,649,079 km (0.081 R)
• M13: 3,133,327 km (0.115 R)
• M14: 3,246,573 km (0.079 R)
• M15: 3,328,253 km (0.083 R)
• M16: 3,443,893 km (0.082 R)
• M17: 3,628,197 km (0.068 R)
• M18: 3,781,535 km (0.048 R)
• M19: 3,867,703 km (0.072 R)
• M20: 4,361,975 km (0.069 R)
• M21: 4,506,935 km (0.085 R)
• M22: 4,913,841 km (0.115 R)
• M23: 5,121,782 km (0.048 R)
• M24: 5,802,602 km (0.027 R)
• M25: 5,962,223 km (0.12 R)
• M26: 6,285,953 km (0.097 R)
• M27: 6,950,467 km (0.12 R)
• M28: 7,141,503 km (0.104 R)
• M29: 7,355,727 km (0.08 R)
• M30: 8,211,278 km (0.062 R)
• M31: 8,323,326 km (0.101 R)
• M32: 8,571,509 km (0.098 R)
• M33: 8,662,315 km (0.118 R)
• M34: 8,776,458 km (0.11 R)
• M35: 9,098,393 km (0.115 R)
• M36: 9,307,381 km (0.063 R)
• M37: 9,753,781 km (0.074 R)
• M38: 9,824,990 km (0.054 R)
• M39: 9,896,348 km (0.047 R)
• M40: 10,159,341 km (0.094 R)
• M41: 10,279,618 km (0.11 R)
• M42: 10,424,578 km (0.108 R)
• M43: 10,863,648 km (0.04 R)
• M44: 10,937,400 km (0.117 R)
• M45: 11,035,985 km (0.109 R)
• M46: 11,433,466 km (0.03 R)
• M47: 11,785,171 km (0.03 R)
• M48: 11,987,726 km (0.068 R)
• M49: 12,089,453 km (0.097 R)
• M50: 12,165,897 km (0.033 R)
• M51: 12,344,966 km (0.108 R)
• M52: 12,653,885 km (0.097 R)
• M53: 13,043,738 km (0.1 R)
• M54: 13,411,150 km (0.051 R)
• M55: 13,649,160 km (0.114 R)
• M56: 13,835,260 km (0.109 R)
• M57: 14,183,225 km (0.116 R)
• M58: 14,398,645 km (0.106 R)
• M59: 15,520,031 km (0.108 R)
• M60: 15,658,708 km (0.089 R)
• M61: 15,825,660 km (0.091 R)
• M62: 15,909,434 km (0.101 R)
• M63: 16,133,382 km (0.069 R)
• M64: 16,527,722 km (0.067 R)
• M65: 16,697,815 km (0.099 R)
• M66: 16,839,933 km (0.093 R)
• M67: 17,039,497 km (0.1 R)
• M68: 17,441,167 km (0.107 R)
• M69: 17,614,252 km (0.052 R)
• M70: 18,078,603 km (0.088 R)
• M71: 18,283,104 km (0.117 R)
• M72: 18,488,352 km (0.091 R)
• M73: 18,841,852 km (0.11 R)
• M74: 19,049,194 km (0.076 R)
• M75: 19,197,745 km (0.088 R)
• M76: 19,406,285 km (0.035 R)
• M77: 19,825,757 km (0.088 R)
• M78: 19,915,965 km (0.071 R)

Planet 7 - Ice Giant

Semi-Major Axis: 15.16 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 458.7

Radius: 7.8

Gravity: 7.54 G

Time & Orbit

Eccentricity (e): 0.149

Orbit Range: 12.9 AU - 17.42 AU

Year: 22004 Days

Day: 25 Hours

Environment

Temp: -202 °C

Axial Tilt: 8.4 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (96)

Outer Limit: 92,600,764 km

• M1: 521,648 km (0.115 R)
• M2: 642,672 km (0.084 R)
• M3: 706,850 km (0.095 R)
• M4: 796,010 km (0.12 R)
• M5: 1,112,260 km (0.114 R)
• M6: 1,298,210 km (0.109 R)
• M7: 1,883,736 km (0.109 R)
• M8: 2,041,861 km (0.106 R)
• M9: 2,106,338 km (0.096 R)
• M10: 2,473,152 km (0.096 R)
• M11: 2,611,530 km (0.112 R)
• M12: 2,968,770 km (0.045 R)
• M13: 3,341,418 km (0.084 R)
• M14: 3,689,532 km (0.106 R)
• M15: 3,928,141 km (0.08 R)
• M16: 4,336,992 km (0.075 R)
• M17: 5,643,280 km (0.09 R)
• M18: 6,433,756 km (0.028 R)
• M19: 6,720,984 km (0.076 R)
• M20: 7,209,121 km (0.101 R)
• M21: 7,658,214 km (0.118 R)
• M22: 7,708,778 km (0.075 R)
• M23: 8,899,727 km (0.048 R)
• M24: 9,059,348 km (0.086 R)
• M25: 10,091,872 km (0.085 R)
• M26: 10,202,724 km (0.088 R)
• M27: 11,275,790 km (0.117 R)
• M28: 11,854,883 km (0.101 R)
• M29: 12,443,700 km (0.075 R)
• M30: 12,801,688 km (0.11 R)
• M31: 12,861,527 km (0.032 R)
• M32: 14,328,933 km (0.116 R)
• M33: 14,892,618 km (0.073 R)
• M34: 15,019,028 km (0.07 R)
• M35: 15,719,894 km (0.087 R)
• M36: 16,041,978 km (0.088 R)
• M37: 17,021,395 km (0.096 R)
• M38: 17,087,368 km (0.071 R)
• M39: 18,154,599 km (0.07 R)
• M40: 18,628,376 km (0.091 R)
• M41: 18,900,793 km (0.09 R)
• M42: 21,341,034 km (0.074 R)
• M43: 21,483,451 km (0.037 R)
• M44: 21,984,454 km (0.066 R)
• M45: 23,143,838 km (0.093 R)
• M46: 24,100,516 km (0.093 R)
• M47: 24,471,968 km (0.064 R)
• M48: 24,920,013 km (0.09 R)
• M49: 25,748,786 km (0.109 R)
• M50: 26,204,461 km (0.056 R)
• M51: 27,355,616 km (0.092 R)
• M52: 29,706,996 km (0.06 R)
• M53: 30,105,225 km (0.108 R)
• M54: 32,285,614 km (0.025 R)
• M55: 33,106,009 km (0.109 R)
• M56: 34,099,488 km (0.049 R)
• M57: 34,182,814 km (0.119 R)
• M58: 35,523,810 km (0.08 R)
• M59: 37,825,522 km (0.105 R)
• M60: 40,174,957 km (0.114 R)
• M61: 41,589,405 km (0.054 R)
• M62: 43,922,384 km (0.068 R)
• M63: 45,013,401 km (0.105 R)
• M64: 45,287,614 km (0.109 R)
• M65: 45,653,979 km (0.096 R)
• M66: 46,021,391 km (0.081 R)
• M67: 46,482,003 km (0.079 R)
• M68: 46,574,305 km (0.104 R)
• M69: 48,152,862 km (0.109 R)
• M70: 49,843,318 km (0.072 R)
• M71: 50,411,191 km (0.081 R)
• M72: 50,600,881 km (0.09 R)
• M73: 51,076,303 km (0.113 R)
• M74: 52,703,779 km (0.11 R)
• M75: 52,992,802 km (0.067 R)
• M76: 53,765,924 km (0.118 R)
• M77: 54,542,785 km (0.081 R)
• M78: 54,640,173 km (0.069 R)
• M79: 55,030,175 km (0.07 R)
• M80: 55,715,034 km (0.111 R)
• M81: 57,588,000 km (0.069 R)
• M82: 58,482,445 km (0.083 R)
• M83: 58,781,491 km (0.046 R)
• M84: 59,682,071 km (0.052 R)
• M85: 60,687,967 km (0.048 R)
• M86: 61,395,415 km (0.09 R)
• M87: 63,841,789 km (0.106 R)
• M88: 64,355,508 km (0.074 R)
• M89: 65,593,879 km (0.114 R)
• M90: 66,215,907 km (0.117 R)
• M91: 67,152,839 km (0.102 R)
• M92: 67,884,522 km (0.11 R)
• M93: 68,618,898 km (0.074 R)
• M94: 68,724,065 km (0.11 R)
• M95: 69,672,516 km (0.088 R)
• M96: 70,095,429 km (0.115 R)

Planet 8 - Ice Giant

Semi-Major Axis: 15.56 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 943.4

Radius: 6.1

Gravity: 25.35 G

Time & Orbit

Eccentricity (e): 0.084

Orbit Range: 14.25 AU - 16.87 AU

Year: 22881 Days

Day: 19.4 Hours

Environment

Temp: -202 °C

Axial Tilt: 35.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (96)

Outer Limit: 92,600,764 km

• M1: 377,735 km (0.062 R)
• M2: 816,056 km (0.104 R)
• M3: 1,335,011 km (0.117 R)
• M4: 2,409,423 km (0.094 R)
• M5: 5,397,342 km (0.088 R)
• M6: 5,504,902 km (0.12 R)
• M7: 6,561,213 km (0.08 R)
• M8: 7,024,368 km (0.096 R)
• M9: 8,043,130 km (0.032 R)
• M10: 8,104,465 km (0.101 R)
• M11: 8,600,980 km (0.044 R)
• M12: 8,789,772 km (0.071 R)
• M13: 9,623,481 km (0.052 R)
• M14: 10,148,869 km (0.101 R)
• M15: 10,415,153 km (0.097 R)
• M16: 10,886,536 km (0.081 R)
• M17: 10,954,454 km (0.113 R)
• M18: 11,159,104 km (0.059 R)
• M19: 11,364,950 km (0.045 R)
• M20: 12,484,092 km (0.065 R)
• M21: 13,346,224 km (0.118 R)
• M22: 13,637,940 km (0.057 R)
• M23: 14,153,305 km (0.064 R)
• M24: 15,355,324 km (0.107 R)
• M25: 15,891,483 km (0.025 R)
• M26: 16,981,901 km (0.099 R)
• M27: 18,338,305 km (0.091 R)
• M28: 19,894,871 km (0.087 R)
• M29: 20,562,975 km (0.051 R)
• M30: 22,351,268 km (0.057 R)
• M31: 22,871,270 km (0.117 R)
• M32: 23,220,133 km (0.116 R)
• M33: 23,395,312 km (0.079 R)
• M34: 24,100,067 km (0.082 R)
• M35: 25,530,672 km (0.082 R)
• M36: 26,165,116 km (0.083 R)
• M37: 26,621,390 km (0.109 R)
• M38: 26,713,093 km (0.056 R)
• M39: 27,634,766 km (0.058 R)
• M40: 27,913,167 km (0.109 R)
• M41: 29,984,051 km (0.098 R)
• M42: 30,557,310 km (0.112 R)
• M43: 30,749,244 km (0.115 R)
• M44: 34,870,665 km (0.108 R)
• M45: 35,272,186 km (0.064 R)
• M46: 35,776,181 km (0.1 R)
• M47: 37,302,528 km (0.071 R)
• M48: 37,405,003 km (0.095 R)
• M49: 39,266,000 km (0.056 R)
• M50: 40,102,851 km (0.058 R)
• M51: 40,628,837 km (0.108 R)
• M52: 41,051,152 km (0.06 R)
• M53: 43,292,726 km (0.076 R)
• M54: 45,683,300 km (0.107 R)
• M55: 45,792,955 km (0.095 R)
• M56: 45,902,760 km (0.086 R)
• M57: 47,115,849 km (0.082 R)
• M58: 47,337,553 km (0.113 R)
• M59: 48,451,459 km (0.119 R)
• M60: 53,453,414 km (0.11 R)
• M61: 55,195,780 km (0.09 R)
• M62: 58,497,704 km (0.107 R)
• M63: 59,812,370 km (0.116 R)
• M64: 59,932,348 km (0.11 R)
• M65: 60,292,729 km (0.109 R)
• M66: 61,015,885 km (0.111 R)
• M67: 61,741,884 km (0.105 R)
• M68: 62,348,952 km (0.108 R)
• M69: 62,836,042 km (0.078 R)
• M70: 64,182,274 km (0.096 R)
• M71: 66,281,281 km (0.08 R)
• M72: 67,152,091 km (0.091 R)
• M73: 67,401,620 km (0.1 R)
• M74: 68,779,416 km (0.083 R)
• M75: 70,927,043 km (0.06 R)
• M76: 72,456,083 km (0.104 R)
• M77: 73,481,577 km (0.061 R)
• M78: 73,867,389 km (0.084 R)
• M79: 74,770,063 km (0.089 R)
• M80: 78,023,966 km (0.079 R)
• M81: 79,338,483 km (0.04 R)
• M82: 79,734,319 km (0.092 R)
• M83: 79,998,509 km (0.101 R)
• M84: 80,130,603 km (0.119 R)
• M85: 80,262,998 km (0.091 R)
• M86: 80,527,786 km (0.079 R)
• M87: 82,656,564 km (0.108 R)
• M88: 85,748,901 km (0.081 R)
• M89: 86,697,501 km (0.048 R)
• M90: 87,513,408 km (0.087 R)
• M91: 88,605,323 km (0.025 R)
• M92: 89,289,883 km (0.113 R)
• M93: 89,427,064 km (0.083 R)
• M94: 90,940,396 km (0.118 R)
• M95: 92,046,223 km (0.095 R)
• M96: 92,323,279 km (0.106 R)

Kuiper Belt

Range: 30 - 59 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 228 - 18,740 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit