Star System Generated (Seed: 1766042787)
Star Details
Spectral Class: M0V
Temperature: 3,700 K
Mass: 0.33 sol
Luminosity: 0.02 lux
Habitable Zone (HZ)
Inner Boundary: 0.13 AU
Outer Boundary: 0.19 AU
Physical Limits
Snow Line: 0.68 AU
Max System Radius: 11.5 AU
Planetary System (8 Planets)
Planet 1 - Gas Giant
Semi-Major Axis: 1.05 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 77.8
Radius: 8
Gravity: 1.22 G
Time & Orbit
Eccentricity (e): 0.048
Orbit Range: 1 AU - 1.1 AU
Year: 684 Days
Day: 8.7 Hours
Environment
Temp: -151 °C
Axial Tilt: 31.9 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (46)
Outer Limit: 22,145,830 km
- M1: 105,766 km (0.061 R)
- M2: 163,660 km (0.116 R)
- M3: 228,137 km (0.098 R)
- M4: 291,267 km (0.11 R)
- M5: 341,682 km (0.087 R)
- M6: 437,873 km (0.119 R)
- M7: 505,940 km (0.062 R)
- M8: 563,984 km (0.075 R)
- M9: 669,002 km (0.109 R)
- M10: 721,211 km (0.12 R)
- M11: 784,342 km (0.101 R)
- M12: 839,693 km (0.041 R)
- M13: 896,390 km (0.083 R)
- M14: 961,316 km (0.094 R)
- M15: 1,035,068 km (0.12 R)
- M16: 1,140,385 km (0.09 R)
- M17: 1,196,185 km (0.091 R)
- M18: 1,302,997 km (0.037 R)
- M19: 1,361,640 km (0.099 R)
- M20: 1,461,272 km (0.106 R)
- M21: 1,518,119 km (0.054 R)
- M22: 1,672,205 km (0.107 R)
- M23: 1,740,422 km (0.081 R)
- M24: 1,818,362 km (0.103 R)
- M25: 1,906,326 km (0.042 R)
- M26: 1,964,370 km (0.096 R)
- M27: 2,050,089 km (0.103 R)
- M28: 2,220,930 km (0.11 R)
- M29: 2,286,753 km (0.053 R)
- M30: 2,343,750 km (0.119 R)
- M31: 2,401,195 km (0.063 R)
- M32: 2,498,135 km (0.077 R)
- M33: 2,586,398 km (0.105 R)
- M34: 2,645,788 km (0.051 R)
- M35: 2,700,690 km (0.06 R)
- M36: 2,760,978 km (0.108 R)
- M37: 2,903,545 km (0.032 R)
- M38: 3,095,778 km (0.062 R)
- M39: 3,169,530 km (0.097 R)
- M40: 3,222,637 km (0.078 R)
- M41: 3,335,135 km (0.091 R)
- M42: 3,476,206 km (0.102 R)
- M43: 3,574,940 km (0.089 R)
- M44: 3,781,086 km (0.103 R)
- M45: 3,831,800 km (0.027 R)
- M46: 3,882,813 km (0.092 R)
Planet 2 - Gas Giant
Semi-Major Axis: 1.27 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 234.3
Radius: 10
Gravity: 2.34 G
Time & Orbit
Eccentricity (e): 0.158
Orbit Range: 1.07 AU - 1.47 AU
Year: 910 Days
Day: 10.3 Hours
Environment
Temp: -171 °C
Axial Tilt: 8.7 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (47)
Outer Limit: 22,145,830 km
- M1: 143,165 km (0.088 R)
- M2: 242,349 km (0.114 R)
- M3: 310,116 km (0.107 R)
- M4: 454,628 km (0.116 R)
- M5: 518,955 km (0.043 R)
- M6: 582,833 km (0.115 R)
- M7: 684,410 km (0.068 R)
- M8: 746,793 km (0.105 R)
- M9: 921,822 km (0.097 R)
- M10: 996,771 km (0.084 R)
- M11: 1,126,622 km (0.069 R)
- M12: 1,279,062 km (0.075 R)
- M13: 1,409,511 km (0.072 R)
- M14: 1,497,026 km (0.098 R)
- M15: 1,574,368 km (0.106 R)
- M16: 1,859,352 km (0.048 R)
- M17: 1,969,007 km (0.076 R)
- M18: 2,208,214 km (0.102 R)
- M19: 2,310,689 km (0.091 R)
- M20: 2,671,369 km (0.071 R)
- M21: 2,884,546 km (0.083 R)
- M22: 2,974,305 km (0.119 R)
- M23: 3,065,111 km (0.113 R)
- M24: 3,366,700 km (0.103 R)
- M25: 3,437,609 km (0.038 R)
- M26: 3,509,117 km (0.073 R)
- M27: 3,702,248 km (0.076 R)
- M28: 3,865,759 km (0.088 R)
- M29: 3,940,258 km (0.076 R)
- M30: 4,107,359 km (0.035 R)
- M31: 4,208,637 km (0.106 R)
- M32: 4,362,424 km (0.118 R)
- M33: 4,448,592 km (0.103 R)
- M34: 4,870,308 km (0.096 R)
- M35: 4,932,840 km (0.086 R)
- M36: 5,095,004 km (0.08 R)
- M37: 5,185,960 km (0.098 R)
- M38: 5,277,364 km (0.098 R)
- M39: 5,369,217 km (0.113 R)
- M40: 5,564,143 km (0.114 R)
- M41: 5,704,765 km (0.058 R)
- M42: 5,818,160 km (0.087 R)
- M43: 5,960,877 km (0.105 R)
- M44: 6,037,620 km (0.071 R)
- M45: 6,396,356 km (0.104 R)
- M46: 6,602,951 km (0.117 R)
- M47: 6,722,031 km (0.093 R)
Planet 3 - Gas Giant
Semi-Major Axis: 1.78 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 15.6
Radius: 14.7
Gravity: 0.07 G
Time & Orbit
Eccentricity (e): 0.204
Orbit Range: 1.42 AU - 2.14 AU
Year: 1510 Days
Day: 7.4 Hours
Environment
Temp: -195 °C
Axial Tilt: 21.1 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (19)
Outer Limit: 22,145,830 km
- M1: 267,481 km (0.097 R)
- M2: 430,991 km (0.09 R)
- M3: 548,725 km (0.098 R)
- M4: 641,476 km (0.068 R)
- M5: 819,348 km (0.117 R)
- M6: 991,983 km (0.12 R)
- M7: 1,135,747 km (0.117 R)
- M8: 1,350,270 km (0.113 R)
- M9: 1,546,992 km (0.069 R)
- M10: 1,663,379 km (0.052 R)
- M11: 1,833,172 km (0.117 R)
- M12: 1,961,378 km (0.118 R)
- M13: 2,114,865 km (0.089 R)
- M14: 2,277,029 km (0.095 R)
- M15: 2,382,944 km (0.04 R)
- M16: 2,566,351 km (0.085 R)
- M17: 2,696,202 km (0.057 R)
- M18: 2,912,820 km (0.08 R)
- M19: 3,726,782 km (0.108 R)
Planet 4 - Gas Giant
Semi-Major Axis: 3.06 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 609.4
Radius: 8.7
Gravity: 8.05 G
Time & Orbit
Eccentricity (e): 0.125
Orbit Range: 2.68 AU - 3.44 AU
Year: 3403 Days
Day: 9.2 Hours
Environment
Temp: -196 °C
Axial Tilt: 14.6 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (76)
Outer Limit: 22,145,830 km
- M1: 118,631 km (0.077 R)
- M2: 191,336 km (0.045 R)
- M3: 260,899 km (0.096 R)
- M4: 335,997 km (0.093 R)
- M5: 496,067 km (0.101 R)
- M6: 682,017 km (0.089 R)
- M7: 804,837 km (0.098 R)
- M8: 1,292,226 km (0.11 R)
- M9: 1,661,883 km (0.059 R)
- M10: 1,858,903 km (0.049 R)
- M11: 2,168,870 km (0.064 R)
- M12: 2,463,279 km (0.117 R)
- M13: 2,672,267 km (0.099 R)
- M14: 3,124,501 km (0.107 R)
- M15: 3,582,719 km (0.115 R)
- M16: 3,783,031 km (0.114 R)
- M17: 3,949,533 km (0.104 R)
- M18: 4,080,880 km (0.11 R)
- M19: 4,137,578 km (0.103 R)
- M20: 4,405,657 km (0.108 R)
- M21: 4,699,318 km (0.115 R)
- M22: 4,778,754 km (0.084 R)
- M23: 5,019,607 km (0.078 R)
- M24: 5,388,366 km (0.084 R)
- M25: 5,513,280 km (0.119 R)
- M26: 5,850,922 km (0.045 R)
- M27: 5,915,100 km (0.105 R)
- M28: 6,043,904 km (0.093 R)
- M29: 6,108,679 km (0.055 R)
- M30: 6,502,421 km (0.039 R)
- M31: 6,635,414 km (0.112 R)
- M32: 6,702,284 km (0.117 R)
- M33: 6,994,748 km (0.081 R)
- M34: 7,268,362 km (0.053 R)
- M35: 7,337,327 km (0.086 R)
- M36: 7,873,186 km (0.092 R)
- M37: 8,542,637 km (0.041 R)
- M38: 8,712,879 km (0.092 R)
- M39: 9,205,505 km (0.118 R)
- M40: 9,455,184 km (0.079 R)
- M41: 9,732,389 km (0.097 R)
- M42: 10,114,761 km (0.118 R)
- M43: 10,372,368 km (0.112 R)
- M44: 10,450,159 km (0.101 R)
- M45: 10,973,303 km (0.071 R)
- M46: 11,424,640 km (0.077 R)
- M47: 11,612,385 km (0.101 R)
- M48: 11,855,033 km (0.099 R)
- M49: 12,072,249 km (0.07 R)
- M50: 12,181,455 km (0.118 R)
- M51: 12,318,188 km (0.079 R)
- M52: 12,815,002 km (0.119 R)
- M53: 13,121,828 km (0.112 R)
- M54: 13,487,744 km (0.119 R)
- M55: 14,171,705 km (0.088 R)
- M56: 14,315,768 km (0.096 R)
- M57: 14,808,843 km (0.12 R)
- M58: 15,101,456 km (0.081 R)
- M59: 15,160,099 km (0.063 R)
- M60: 15,219,040 km (0.117 R)
- M61: 16,381,416 km (0.11 R)
- M62: 16,775,307 km (0.111 R)
- M63: 16,927,597 km (0.077 R)
- M64: 17,944,265 km (0.116 R)
- M65: 18,099,996 km (0.117 R)
- M66: 18,193,794 km (0.051 R)
- M67: 19,139,402 km (0.052 R)
- M68: 19,202,981 km (0.083 R)
- M69: 19,586,251 km (0.071 R)
- M70: 20,036,391 km (0.11 R)
- M71: 21,111,102 km (0.117 R)
- M72: 21,242,598 km (0.11 R)
- M73: 21,738,366 km (0.114 R)
- M74: 22,171,003 km (0.049 R)
- M75: 22,304,743 km (0.094 R)
- M76: 22,472,293 km (0.088 R)
Planet 5 - Gas Giant
Semi-Major Axis: 4.69 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 305.2
Radius: 8.4
Gravity: 4.33 G
Time & Orbit
Eccentricity (e): 0.063
Orbit Range: 4.39 AU - 4.99 AU
Year: 6458 Days
Day: 5.5 Hours
Environment
Temp: -209 °C
Axial Tilt: 43.4 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (72)
Outer Limit: 22,145,830 km
- M1: 106,962 km (0.093 R)
- M2: 170,242 km (0.111 R)
- M3: 282,890 km (0.088 R)
- M4: 427,551 km (0.039 R)
- M5: 686,654 km (0.073 R)
- M6: 914,941 km (0.106 R)
- M7: 1,411,157 km (0.07 R)
- M8: 1,516,474 km (0.078 R)
- M9: 1,593,367 km (0.099 R)
- M10: 1,687,464 km (0.056 R)
- M11: 1,897,649 km (0.085 R)
- M12: 2,237,535 km (0.069 R)
- M13: 2,290,194 km (0.034 R)
- M14: 2,396,857 km (0.101 R)
- M15: 2,523,267 km (0.076 R)
- M16: 3,051,348 km (0.082 R)
- M17: 3,328,253 km (0.097 R)
- M18: 3,489,969 km (0.108 R)
- M19: 3,842,571 km (0.12 R)
- M20: 4,141,617 km (0.074 R)
- M21: 5,106,374 km (0.107 R)
- M22: 5,246,397 km (0.071 R)
- M23: 5,340,494 km (0.061 R)
- M24: 5,482,612 km (0.115 R)
- M25: 5,625,927 km (0.1 R)
- M26: 5,892,211 km (0.096 R)
- M27: 5,990,048 km (0.07 R)
- M28: 6,361,649 km (0.112 R)
- M29: 6,462,030 km (0.074 R)
- M30: 7,049,500 km (0.109 R)
- M31: 8,138,573 km (0.092 R)
- M32: 8,577,792 km (0.083 R)
- M33: 8,688,794 km (0.116 R)
- M34: 8,800,244 km (0.113 R)
- M35: 9,081,040 km (0.098 R)
- M36: 9,222,559 km (0.119 R)
- M37: 9,507,693 km (0.106 R)
- M38: 9,565,138 km (0.086 R)
- M39: 9,853,862 km (0.118 R)
- M40: 10,321,804 km (0.047 R)
- M41: 10,767,008 km (0.101 R)
- M42: 10,916,905 km (0.068 R)
- M43: 11,097,619 km (0.105 R)
- M44: 11,218,644 km (0.045 R)
- M45: 11,676,413 km (0.039 R)
- M46: 12,171,432 km (0.059 R)
- M47: 12,233,665 km (0.105 R)
- M48: 12,484,242 km (0.089 R)
- M49: 12,704,898 km (0.118 R)
- M50: 13,600,092 km (0.047 R)
- M51: 13,729,644 km (0.081 R)
- M52: 13,827,032 km (0.107 R)
- M53: 14,120,842 km (0.093 R)
- M54: 14,284,801 km (0.102 R)
- M55: 15,316,129 km (0.085 R)
- M56: 15,383,448 km (0.115 R)
- M57: 15,518,535 km (0.079 R)
- M58: 15,721,689 km (0.114 R)
- M59: 17,204,054 km (0.117 R)
- M60: 17,344,228 km (0.119 R)
- M61: 17,766,991 km (0.109 R)
- M62: 19,128,033 km (0.114 R)
- M63: 19,273,292 km (0.112 R)
- M64: 20,115,378 km (0.117 R)
- M65: 21,081,781 km (0.114 R)
- M66: 21,873,303 km (0.113 R)
- M67: 23,330,237 km (0.081 R)
- M68: 23,407,878 km (0.048 R)
- M69: 25,454,078 km (0.115 R)
- M70: 25,894,195 km (0.118 R)
- M71: 26,741,517 km (0.095 R)
- M72: 27,148,124 km (0.057 R)
Planet 6 - Gas Giant
Semi-Major Axis: 5.23 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 378.3
Radius: 10.1
Gravity: 3.71 G
Time & Orbit
Eccentricity (e): 0.201
Orbit Range: 4.18 AU - 6.28 AU
Year: 7605 Days
Day: 13.6 Hours
Environment
Temp: -210 °C
Axial Tilt: 3.7 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (64)
Outer Limit: 22,145,830 km
- M1: 140,772 km (0.08 R)
- M2: 217,964 km (0.08 R)
- M3: 523,892 km (0.083 R)
- M4: 743,053 km (0.053 R)
- M5: 892,052 km (0.06 R)
- M6: 1,096,403 km (0.061 R)
- M7: 1,415,046 km (0.12 R)
- M8: 1,499,419 km (0.1 R)
- M9: 1,726,659 km (0.067 R)
- M10: 2,098,110 km (0.064 R)
- M11: 2,701,738 km (0.071 R)
- M12: 2,957,849 km (0.094 R)
- M13: 3,088,897 km (0.1 R)
- M14: 3,155,019 km (0.106 R)
- M15: 3,424,894 km (0.097 R)
- M16: 4,254,563 km (0.096 R)
- M17: 4,781,298 km (0.07 R)
- M18: 5,196,432 km (0.091 R)
- M19: 5,813,672 km (0.115 R)
- M20: 6,313,030 km (0.109 R)
- M21: 6,855,023 km (0.096 R)
- M22: 7,116,969 km (0.11 R)
- M23: 7,831,748 km (0.102 R)
- M24: 8,851,556 km (0.082 R)
- M25: 9,041,396 km (0.119 R)
- M26: 9,328,774 km (0.102 R)
- M27: 10,176,096 km (0.094 R)
- M28: 10,878,308 km (0.094 R)
- M29: 12,897,880 km (0.108 R)
- M30: 13,005,440 km (0.093 R)
- M31: 13,803,545 km (0.074 R)
- M32: 13,950,301 km (0.094 R)
- M33: 14,319,658 km (0.087 R)
- M34: 16,021,034 km (0.092 R)
- M35: 16,252,761 km (0.101 R)
- M36: 16,680,462 km (0.094 R)
- M37: 16,836,792 km (0.05 R)
- M38: 17,348,566 km (0.106 R)
- M39: 17,467,347 km (0.111 R)
- M40: 17,745,748 km (0.069 R)
- M41: 18,630,021 km (0.107 R)
- M42: 18,832,876 km (0.057 R)
- M43: 19,323,108 km (0.076 R)
- M44: 19,446,227 km (0.111 R)
- M45: 19,693,363 km (0.117 R)
- M46: 20,399,465 km (0.091 R)
- M47: 20,566,715 km (0.047 R)
- M48: 22,093,062 km (0.11 R)
- M49: 22,350,969 km (0.106 R)
- M50: 23,174,356 km (0.057 R)
- M51: 23,787,408 km (0.119 R)
- M52: 23,919,503 km (0.074 R)
- M53: 24,940,059 km (0.12 R)
- M54: 25,523,192 km (0.071 R)
- M55: 25,748,786 km (0.081 R)
- M56: 26,794,475 km (0.095 R)
- M57: 27,115,512 km (0.057 R)
- M58: 27,391,669 km (0.12 R)
- M59: 30,204,558 km (0.098 R)
- M60: 30,634,353 km (0.113 R)
- M61: 31,548,396 km (0.118 R)
- M62: 31,693,506 km (0.1 R)
- M63: 31,936,004 km (0.064 R)
- M64: 32,373,727 km (0.074 R)
Planet 7 - Ice Giant
Semi-Major Axis: 7.23 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 29.2
Radius: 7.1
Gravity: 0.58 G
Time & Orbit
Eccentricity (e): 0.245
Orbit Range: 5.46 AU - 9 AU
Year: 12361 Days
Day: 16.4 Hours
Environment
Temp: -224 °C
Axial Tilt: 25.8 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (48)
Outer Limit: 22,145,830 km
- M1: 116,686 km (0.071 R)
- M2: 490,531 km (0.106 R)
- M3: 946,955 km (0.113 R)
- M4: 998,566 km (0.035 R)
- M5: 1,237,174 km (0.1 R)
- M6: 1,339,948 km (0.116 R)
- M7: 1,591,123 km (0.108 R)
- M8: 1,690,755 km (0.1 R)
- M9: 1,741,319 km (0.086 R)
- M10: 1,831,078 km (0.106 R)
- M11: 2,069,238 km (0.078 R)
- M12: 2,359,458 km (0.064 R)
- M13: 2,947,826 km (0.111 R)
- M14: 3,009,012 km (0.115 R)
- M15: 3,337,828 km (0.101 R)
- M16: 3,482,190 km (0.073 R)
- M17: 4,321,583 km (0.044 R)
- M18: 4,479,110 km (0.099 R)
- M19: 5,239,067 km (0.085 R)
- M20: 5,294,867 km (0.102 R)
- M21: 5,444,764 km (0.098 R)
- M22: 6,333,226 km (0.074 R)
- M23: 6,472,352 km (0.051 R)
- M24: 7,059,524 km (0.055 R)
- M25: 8,154,580 km (0.117 R)
- M26: 8,721,855 km (0.067 R)
- M27: 8,854,548 km (0.096 R)
- M28: 9,144,319 km (0.045 R)
- M29: 9,963,218 km (0.043 R)
- M30: 10,194,796 km (0.101 R)
- M31: 10,264,658 km (0.113 R)
- M32: 10,829,091 km (0.069 R)
- M33: 10,995,593 km (0.059 R)
- M34: 11,091,186 km (0.116 R)
- M35: 11,524,422 km (0.102 R)
- M36: 12,582,079 km (0.105 R)
- M37: 12,782,240 km (0.084 R)
- M38: 13,084,428 km (0.089 R)
- M39: 13,134,992 km (0.098 R)
- M40: 13,236,420 km (0.099 R)
- M41: 13,312,565 km (0.108 R)
- M42: 13,695,984 km (0.108 R)
- M43: 14,082,844 km (0.118 R)
- M44: 16,917,874 km (0.11 R)
- M45: 17,277,507 km (0.117 R)
- M46: 17,472,134 km (0.083 R)
- M47: 18,541,459 km (0.065 R)
- M48: 18,998,032 km (0.089 R)
Planet 8 - Ice Giant
Semi-Major Axis: 7.75 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 35.9
Radius: 3.1
Gravity: 3.74 G
Time & Orbit
Eccentricity (e): 0.06
Orbit Range: 7.29 AU - 8.22 AU
Year: 13718 Days
Day: 18.2 Hours
Environment
Temp: -233 °C
Axial Tilt: 19.9 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (32)
Outer Limit: 22,145,830 km
- M1: 120,725 km (0.113 R)
- M2: 586,424 km (0.111 R)
- M3: 615,595 km (0.041 R)
- M4: 1,629,270 km (0.076 R)
- M5: 2,413,762 km (0.091 R)
- M6: 2,885,294 km (0.091 R)
- M7: 3,003,327 km (0.058 R)
- M8: 3,526,770 km (0.108 R)
- M9: 4,440,663 km (0.066 R)
- M10: 6,228,657 km (0.076 R)
- M11: 7,390,434 km (0.111 R)
- M12: 8,161,461 km (0.039 R)
- M13: 9,753,183 km (0.093 R)
- M14: 9,828,879 km (0.068 R)
- M15: 9,879,593 km (0.11 R)
- M16: 10,545,154 km (0.061 R)
- M17: 10,596,915 km (0.095 R)
- M18: 10,857,215 km (0.104 R)
- M19: 11,172,268 km (0.076 R)
- M20: 11,623,755 km (0.118 R)
- M21: 12,572,055 km (0.045 R)
- M22: 12,985,993 km (0.11 R)
- M23: 13,320,344 km (0.119 R)
- M24: 14,743,618 km (0.112 R)
- M25: 15,502,678 km (0.084 R)
- M26: 16,424,051 km (0.034 R)
- M27: 16,484,189 km (0.098 R)
- M28: 16,876,285 km (0.047 R)
- M29: 19,103,199 km (0.037 R)
- M30: 20,057,933 km (0.041 R)
- M31: 21,289,273 km (0.095 R)
- M32: 21,485,994 km (0.042 R)
Kuiper Belt
Range: 30 - 56 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 298 - 14,863 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.