Star System Generated (Seed: 1766324223)
Star Details
Spectral Class: M5V
Temperature: 3,050 K
Mass: 0.3 sol
Luminosity: 0.01 lux
Habitable Zone (HZ)
Inner Boundary: 0.1 AU
Outer Boundary: 0.14 AU
Physical Limits
Snow Line: 0.48 AU
Max System Radius: 11 AU
Planetary System (7 Planets)
Planet 1 - Gas Giant
Semi-Major Axis: 0.53 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 306.4
Radius: 9.1
Gravity: 3.7 G
Time & Orbit
Eccentricity (e): 0.111
Orbit Range: 0.47 AU - 0.59 AU
Year: 257 Days
Day: 9.9 Hours
Environment
Temp: -135 °C
Axial Tilt: 34.5 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (33)
Outer Limit: 90,864,894 km
- M1: 117,734 km (0.095 R)
- M2: 213,626 km (0.103 R)
- M3: 317,895 km (0.083 R)
- M4: 378,483 km (0.072 R)
- M5: 448,644 km (0.091 R)
- M6: 536,009 km (0.072 R)
- M7: 614,548 km (0.054 R)
- M8: 686,804 km (0.081 R)
- M9: 837,898 km (0.059 R)
- M10: 952,041 km (0.081 R)
- M11: 1,055,862 km (0.069 R)
- M12: 1,121,984 km (0.108 R)
- M13: 1,212,491 km (0.094 R)
- M14: 1,288,786 km (0.079 R)
- M15: 1,349,672 km (0.11 R)
- M16: 1,432,400 km (0.096 R)
- M17: 1,520,513 km (0.088 R)
- M18: 1,588,580 km (0.098 R)
- M19: 1,650,513 km (0.094 R)
- M20: 1,750,594 km (0.076 R)
- M21: 2,003,863 km (0.12 R)
- M22: 2,098,858 km (0.117 R)
- M23: 2,191,310 km (0.108 R)
- M24: 2,376,512 km (0.119 R)
- M25: 2,447,720 km (0.055 R)
- M26: 2,562,462 km (0.103 R)
- M27: 2,657,157 km (0.113 R)
- M28: 2,792,843 km (0.11 R)
- M29: 2,859,264 km (0.042 R)
- M30: 2,966,675 km (0.087 R)
- M31: 3,029,955 km (0.092 R)
- M32: 3,102,959 km (0.116 R)
- M33: 3,162,649 km (0.064 R)
Planet 2 - Gas Giant
Semi-Major Axis: 0.87 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 744.8
Radius: 10.9
Gravity: 6.27 G
Time & Orbit
Eccentricity (e): 0.018
Orbit Range: 0.85 AU - 0.89 AU
Year: 541 Days
Day: 10.1 Hours
Environment
Temp: -170 °C
Axial Tilt: 26 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (47)
Outer Limit: 90,864,894 km
- M1: 138,827 km (0.108 R)
- M2: 224,696 km (0.105 R)
- M3: 303,983 km (0.116 R)
- M4: 401,820 km (0.072 R)
- M5: 578,196 km (0.064 R)
- M6: 676,930 km (0.112 R)
- M7: 786,885 km (0.064 R)
- M8: 883,525 km (0.084 R)
- M9: 1,010,384 km (0.054 R)
- M10: 1,149,360 km (0.063 R)
- M11: 1,300,454 km (0.113 R)
- M12: 1,387,520 km (0.086 R)
- M13: 1,470,547 km (0.101 R)
- M14: 1,579,903 km (0.025 R)
- M15: 1,654,403 km (0.101 R)
- M16: 1,944,623 km (0.089 R)
- M17: 2,147,178 km (0.093 R)
- M18: 2,265,211 km (0.108 R)
- M19: 2,442,634 km (0.077 R)
- M20: 2,544,211 km (0.046 R)
- M21: 2,654,465 km (0.079 R)
- M22: 2,743,924 km (0.047 R)
- M23: 2,887,538 km (0.094 R)
- M24: 3,269,761 km (0.112 R)
- M25: 3,414,422 km (0.09 R)
- M26: 3,528,266 km (0.045 R)
- M27: 3,643,456 km (0.027 R)
- M28: 3,860,672 km (0.081 R)
- M29: 4,039,442 km (0.083 R)
- M30: 4,212,078 km (0.103 R)
- M31: 4,378,430 km (0.101 R)
- M32: 4,591,757 km (0.079 R)
- M33: 4,681,665 km (0.116 R)
- M34: 4,799,399 km (0.093 R)
- M35: 5,028,732 km (0.06 R)
- M36: 5,252,232 km (0.101 R)
- M37: 5,536,318 km (0.058 R)
- M38: 5,651,359 km (0.08 R)
- M39: 5,991,395 km (0.057 R)
- M40: 6,258,427 km (0.073 R)
- M41: 6,368,381 km (0.073 R)
- M42: 6,438,543 km (0.096 R)
- M43: 6,600,258 km (0.032 R)
- M44: 6,722,330 km (0.069 R)
- M45: 6,804,160 km (0.052 R)
- M46: 6,948,073 km (0.114 R)
- M47: 7,030,950 km (0.086 R)
Planet 3 - Gas Giant
Semi-Major Axis: 0.89 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 42.6
Radius: 8
Gravity: 0.67 G
Time & Orbit
Eccentricity (e): 0.213
Orbit Range: 0.7 AU - 1.08 AU
Year: 560 Days
Day: 7.7 Hours
Environment
Temp: -168 °C
Axial Tilt: 38.8 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (28)
Outer Limit: 90,864,894 km
- M1: 107,710 km (0.119 R)
- M2: 210,933 km (0.069 R)
- M3: 261,497 km (0.12 R)
- M4: 328,517 km (0.104 R)
- M5: 416,480 km (0.071 R)
- M6: 479,611 km (0.092 R)
- M7: 609,761 km (0.097 R)
- M8: 668,702 km (0.101 R)
- M9: 749,635 km (0.085 R)
- M10: 803,041 km (0.114 R)
- M11: 860,487 km (0.053 R)
- M12: 1,055,563 km (0.105 R)
- M13: 1,130,661 km (0.044 R)
- M14: 1,192,594 km (0.119 R)
- M15: 1,326,335 km (0.102 R)
- M16: 1,376,300 km (0.086 R)
- M17: 1,510,340 km (0.098 R)
- M18: 1,592,320 km (0.107 R)
- M19: 1,836,613 km (0.062 R)
- M20: 1,938,489 km (0.081 R)
- M21: 2,013,438 km (0.069 R)
- M22: 2,118,605 km (0.086 R)
- M23: 2,292,887 km (0.102 R)
- M24: 2,345,844 km (0.049 R)
- M25: 2,460,436 km (0.086 R)
- M26: 2,632,025 km (0.079 R)
- M27: 2,691,415 km (0.037 R)
- M28: 2,751,254 km (0.059 R)
Planet 4 - Gas Giant
Semi-Major Axis: 1.01 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 518.1
Radius: 14.4
Gravity: 2.5 G
Time & Orbit
Eccentricity (e): 0.206
Orbit Range: 0.8 AU - 1.22 AU
Year: 677 Days
Day: 11.6 Hours
Environment
Temp: -176 °C
Axial Tilt: 27.2 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (39)
Outer Limit: 90,864,894 km
- M1: 180,864 km (0.081 R)
- M2: 283,039 km (0.083 R)
- M3: 389,553 km (0.104 R)
- M4: 510,727 km (0.09 R)
- M5: 728,392 km (0.069 R)
- M6: 864,825 km (0.093 R)
- M7: 969,693 km (0.114 R)
- M8: 1,106,127 km (0.079 R)
- M9: 1,335,759 km (0.1 R)
- M10: 1,643,931 km (0.08 R)
- M11: 1,810,134 km (0.038 R)
- M12: 2,077,166 km (0.065 R)
- M13: 2,187,719 km (0.117 R)
- M14: 2,293,335 km (0.12 R)
- M15: 2,400,597 km (0.079 R)
- M16: 2,561,116 km (0.083 R)
- M17: 2,657,756 km (0.087 R)
- M18: 2,908,781 km (0.076 R)
- M19: 3,183,592 km (0.118 R)
- M20: 3,328,253 km (0.094 R)
- M21: 3,574,492 km (0.104 R)
- M22: 3,741,892 km (0.063 R)
- M23: 4,006,829 km (0.059 R)
- M24: 4,269,224 km (0.073 R)
- M25: 4,402,516 km (0.05 R)
- M26: 4,582,482 km (0.082 R)
- M27: 4,792,517 km (0.114 R)
- M28: 5,033,819 km (0.06 R)
- M29: 5,127,617 km (0.113 R)
- M30: 5,241,161 km (0.12 R)
- M31: 5,365,028 km (0.076 R)
- M32: 5,518,815 km (0.113 R)
- M33: 5,654,650 km (0.092 R)
- M34: 5,860,646 km (0.097 R)
- M35: 6,249,601 km (0.056 R)
- M36: 6,421,788 km (0.072 R)
- M37: 6,523,814 km (0.09 R)
- M38: 6,864,597 km (0.074 R)
- M39: 7,021,376 km (0.095 R)
Planet 5 - Gas Giant
Semi-Major Axis: 4.53 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 936
Radius: 9.4
Gravity: 10.59 G
Time & Orbit
Eccentricity (e): 0.019
Orbit Range: 4.44 AU - 4.62 AU
Year: 6429 Days
Day: 8.2 Hours
Environment
Temp: -223 °C
Axial Tilt: 17.9 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (83)
Outer Limit: 90,864,894 km
- M1: 123,418 km (0.039 R)
- M2: 212,279 km (0.101 R)
- M3: 432,936 km (0.073 R)
- M4: 558,598 km (0.094 R)
- M5: 848,519 km (0.092 R)
- M6: 1,027,588 km (0.072 R)
- M7: 1,422,825 km (0.108 R)
- M8: 1,637,498 km (0.046 R)
- M9: 2,320,861 km (0.086 R)
- M10: 2,389,078 km (0.039 R)
- M11: 2,959,644 km (0.08 R)
- M12: 3,597,530 km (0.099 R)
- M13: 3,783,779 km (0.109 R)
- M14: 3,864,562 km (0.119 R)
- M15: 3,945,943 km (0.068 R)
- M16: 4,165,702 km (0.031 R)
- M17: 4,878,387 km (0.041 R)
- M18: 4,937,179 km (0.088 R)
- M19: 5,204,061 km (0.1 R)
- M20: 5,783,005 km (0.106 R)
- M21: 5,876,354 km (0.071 R)
- M22: 5,938,886 km (0.102 R)
- M23: 6,159,393 km (0.032 R)
- M24: 7,436,510 km (0.107 R)
- M25: 7,742,587 km (0.088 R)
- M26: 8,087,710 km (0.058 R)
- M27: 8,227,135 km (0.043 R)
- M28: 8,473,074 km (0.061 R)
- M29: 8,721,406 km (0.099 R)
- M30: 8,792,764 km (0.069 R)
- M31: 9,627,969 km (0.101 R)
- M32: 9,887,222 km (0.082 R)
- M33: 10,640,448 km (0.077 R)
- M34: 11,062,613 km (0.097 R)
- M35: 11,647,241 km (0.114 R)
- M36: 11,725,930 km (0.103 R)
- M37: 11,804,768 km (0.113 R)
- M38: 11,963,192 km (0.035 R)
- M39: 12,362,020 km (0.094 R)
- M40: 12,482,446 km (0.058 R)
- M41: 12,846,418 km (0.103 R)
- M42: 13,213,681 km (0.113 R)
- M43: 13,460,517 km (0.057 R)
- M44: 14,336,562 km (0.098 R)
- M45: 14,632,617 km (0.095 R)
- M46: 14,802,709 km (0.092 R)
- M47: 14,930,765 km (0.064 R)
- M48: 15,706,580 km (0.114 R)
- M49: 15,793,646 km (0.082 R)
- M50: 16,363,015 km (0.08 R)
- M51: 16,894,686 km (0.077 R)
- M52: 17,432,041 km (0.1 R)
- M53: 18,157,292 km (0.064 R)
- M54: 18,385,878 km (0.062 R)
- M55: 18,892,266 km (0.112 R)
- M56: 19,123,993 km (0.109 R)
- M57: 19,310,093 km (0.112 R)
- M58: 19,403,293 km (0.069 R)
- M59: 19,637,114 km (0.109 R)
- M60: 20,915,577 km (0.113 R)
- M61: 21,685,857 km (0.098 R)
- M62: 22,907,922 km (0.079 R)
- M63: 23,056,024 km (0.047 R)
- M64: 23,552,240 km (0.054 R)
- M65: 23,801,620 km (0.105 R)
- M66: 24,554,994 km (0.118 R)
- M67: 24,807,964 km (0.083 R)
- M68: 27,122,692 km (0.117 R)
- M69: 27,436,399 km (0.053 R)
- M70: 27,804,111 km (0.111 R)
- M71: 28,650,535 km (0.087 R)
- M72: 29,290,964 km (0.118 R)
- M73: 29,398,076 km (0.11 R)
- M74: 30,640,187 km (0.109 R)
- M75: 31,679,144 km (0.096 R)
- M76: 33,679,268 km (0.065 R)
- M77: 33,903,964 km (0.059 R)
- M78: 35,262,911 km (0.108 R)
- M79: 35,548,194 km (0.088 R)
- M80: 36,236,195 km (0.106 R)
- M81: 37,334,542 km (0.026 R)
- M82: 37,741,897 km (0.102 R)
- M83: 39,563,700 km (0.096 R)
Planet 6 - Ice Giant
Semi-Major Axis: 9.87 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 856.8
Radius: 6.3
Gravity: 21.59 G
Time & Orbit
Eccentricity (e): 0.083
Orbit Range: 9.05 AU - 10.69 AU
Year: 20678 Days
Day: 16.1 Hours
Environment
Temp: -232 °C
Axial Tilt: 28.1 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (95)
Outer Limit: 90,864,894 km
- M1: 85,869 km (0.082 R)
- M2: 1,158,486 km (0.09 R)
- M3: 1,662,631 km (0.113 R)
- M4: 1,867,729 km (0.108 R)
- M5: 2,044,853 km (0.11 R)
- M6: 2,301,862 km (0.096 R)
- M7: 2,806,456 km (0.066 R)
- M8: 2,887,089 km (0.092 R)
- M9: 3,050,600 km (0.115 R)
- M10: 5,488,447 km (0.101 R)
- M11: 6,796,231 km (0.049 R)
- M12: 7,289,605 km (0.111 R)
- M13: 7,851,345 km (0.092 R)
- M14: 8,602,326 km (0.113 R)
- M15: 9,376,047 km (0.115 R)
- M16: 10,421,137 km (0.115 R)
- M17: 10,546,500 km (0.094 R)
- M18: 11,567,356 km (0.075 R)
- M19: 11,632,282 km (0.037 R)
- M20: 11,697,207 km (0.081 R)
- M21: 13,292,369 km (0.051 R)
- M22: 15,166,831 km (0.119 R)
- M23: 15,308,949 km (0.11 R)
- M24: 15,737,995 km (0.073 R)
- M25: 17,642,376 km (0.117 R)
- M26: 18,545,498 km (0.09 R)
- M27: 18,697,490 km (0.118 R)
- M28: 19,232,751 km (0.114 R)
- M29: 19,695,457 km (0.084 R)
- M30: 20,083,963 km (0.059 R)
- M31: 21,026,579 km (0.054 R)
- M32: 21,185,003 km (0.085 R)
- M33: 21,823,038 km (0.113 R)
- M34: 24,105,004 km (0.118 R)
- M35: 25,696,277 km (0.11 R)
- M36: 25,950,593 km (0.118 R)
- M37: 26,718,629 km (0.116 R)
- M38: 26,890,367 km (0.113 R)
- M39: 27,148,573 km (0.067 R)
- M40: 27,494,144 km (0.064 R)
- M41: 27,928,127 km (0.057 R)
- M42: 28,015,193 km (0.056 R)
- M43: 28,627,348 km (0.047 R)
- M44: 31,299,914 km (0.116 R)
- M45: 34,330,467 km (0.044 R)
- M46: 34,423,816 km (0.049 R)
- M47: 36,402,248 km (0.1 R)
- M48: 36,592,537 km (0.092 R)
- M49: 37,934,280 km (0.062 R)
- M50: 38,611,061 km (0.075 R)
- M51: 38,902,328 km (0.101 R)
- M52: 39,487,256 km (0.072 R)
- M53: 40,074,876 km (0.086 R)
- M54: 40,173,162 km (0.112 R)
- M55: 40,665,488 km (0.09 R)
- M56: 40,862,958 km (0.117 R)
- M57: 40,961,842 km (0.094 R)
- M58: 41,258,943 km (0.094 R)
- M59: 41,656,125 km (0.039 R)
- M60: 43,358,549 km (0.091 R)
- M61: 49,019,781 km (0.048 R)
- M62: 49,229,966 km (0.07 R)
- M63: 50,073,698 km (0.074 R)
- M64: 50,709,639 km (0.084 R)
- M65: 52,418,645 km (0.081 R)
- M66: 54,581,382 km (0.103 R)
- M67: 55,564,090 km (0.06 R)
- M68: 56,112,516 km (0.105 R)
- M69: 56,442,379 km (0.086 R)
- M70: 57,104,200 km (0.083 R)
- M71: 57,214,753 km (0.079 R)
- M72: 57,879,566 km (0.091 R)
- M73: 58,546,922 km (0.07 R)
- M74: 60,564,249 km (0.06 R)
- M75: 61,354,874 km (0.077 R)
- M76: 62,718,309 km (0.072 R)
- M77: 64,782,012 km (0.093 R)
- M78: 66,170,130 km (0.085 R)
- M79: 68,857,955 km (0.12 R)
- M80: 68,975,689 km (0.109 R)
- M81: 70,630,091 km (0.086 R)
- M82: 71,105,214 km (0.114 R)
- M83: 71,700,614 km (0.116 R)
- M84: 72,297,509 km (0.095 R)
- M85: 72,656,544 km (0.089 R)
- M86: 74,823,021 km (0.116 R)
- M87: 75,186,095 km (0.102 R)
- M88: 76,157,284 km (0.083 R)
- M89: 78,357,719 km (0.09 R)
- M90: 80,331,065 km (0.158 R)
- M91: 80,951,148 km (0.104 R)
- M92: 82,445,631 km (0.07 R)
- M93: 82,820,672 km (0.073 R)
- M94: 83,196,313 km (0.107 R)
- M95: 83,698,064 km (0.117 R)
Planet 7 - Ice Giant
Semi-Major Axis: 10.34 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 949.2
Radius: 6.2
Gravity: 24.69 G
Time & Orbit
Eccentricity (e): 0.063
Orbit Range: 9.69 AU - 10.99 AU
Year: 22172 Days
Day: 19.8 Hours
Environment
Temp: -235 °C
Axial Tilt: 38.2 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (91)
Outer Limit: 90,864,894 km
- M1: 130,300 km (0.096 R)
- M2: 211,681 km (0.079 R)
- M3: 373,396 km (0.11 R)
- M4: 572,661 km (0.032 R)
- M5: 858,542 km (0.059 R)
- M6: 972,835 km (0.112 R)
- M7: 1,122,732 km (0.097 R)
- M8: 1,687,015 km (0.108 R)
- M9: 1,758,523 km (0.107 R)
- M10: 2,054,876 km (0.112 R)
- M11: 2,248,007 km (0.109 R)
- M12: 2,487,663 km (0.119 R)
- M13: 2,948,125 km (0.096 R)
- M14: 2,991,209 km (0.102 R)
- M15: 4,630,503 km (0.112 R)
- M16: 5,194,038 km (0.108 R)
- M17: 5,298,757 km (0.113 R)
- M18: 8,503,891 km (0.108 R)
- M19: 8,876,539 km (0.099 R)
- M20: 11,561,971 km (0.119 R)
- M21: 11,974,711 km (0.077 R)
- M22: 12,532,262 km (0.1 R)
- M23: 12,743,644 km (0.102 R)
- M24: 13,241,207 km (0.063 R)
- M25: 13,890,312 km (0.073 R)
- M26: 13,963,016 km (0.106 R)
- M27: 14,549,739 km (0.098 R)
- M28: 14,846,093 km (0.084 R)
- M29: 15,219,339 km (0.112 R)
- M30: 15,975,108 km (0.032 R)
- M31: 16,127,847 km (0.073 R)
- M32: 17,287,829 km (0.089 R)
- M33: 17,444,458 km (0.12 R)
- M34: 19,280,174 km (0.096 R)
- M35: 19,524,018 km (0.06 R)
- M36: 20,344,562 km (0.104 R)
- M37: 21,092,552 km (0.038 R)
- M38: 21,260,101 km (0.07 R)
- M39: 22,274,076 km (0.093 R)
- M40: 22,359,197 km (0.119 R)
- M41: 23,998,640 km (0.111 R)
- M42: 24,348,699 km (0.051 R)
- M43: 24,700,553 km (0.112 R)
- M44: 29,050,710 km (0.091 R)
- M45: 31,791,044 km (0.059 R)
- M46: 33,532,961 km (0.089 R)
- M47: 34,120,432 km (0.11 R)
- M48: 34,514,024 km (0.087 R)
- M49: 35,206,363 km (0.091 R)
- M50: 35,604,144 km (0.059 R)
- M51: 36,705,334 km (0.079 R)
- M52: 37,007,671 km (0.087 R)
- M53: 37,817,893 km (0.095 R)
- M54: 40,387,087 km (0.076 R)
- M55: 41,640,119 km (0.109 R)
- M56: 42,694,036 km (0.067 R)
- M57: 43,224,360 km (0.101 R)
- M58: 44,720,787 km (0.037 R)
- M59: 46,451,485 km (0.106 R)
- M60: 48,535,234 km (0.09 R)
- M61: 48,977,744 km (0.07 R)
- M62: 50,201,605 km (0.063 R)
- M63: 50,761,250 km (0.089 R)
- M64: 52,906,633 km (0.08 R)
- M65: 53,704,439 km (0.119 R)
- M66: 58,692,032 km (0.111 R)
- M67: 59,517,812 km (0.111 R)
- M68: 59,991,439 km (0.115 R)
- M69: 60,585,342 km (0.086 R)
- M70: 60,704,273 km (0.089 R)
- M71: 61,061,812 km (0.116 R)
- M72: 61,300,420 km (0.047 R)
- M73: 63,825,333 km (0.1 R)
- M74: 67,737,617 km (0.106 R)
- M75: 68,232,038 km (0.109 R)
- M76: 69,847,395 km (0.113 R)
- M77: 71,852,605 km (0.068 R)
- M78: 72,356,900 km (0.111 R)
- M79: 75,407,200 km (0.111 R)
- M80: 75,919,573 km (0.114 R)
- M81: 76,047,928 km (0.115 R)
- M82: 77,981,032 km (0.042 R)
- M83: 78,888,642 km (0.039 R)
- M84: 79,018,493 km (0.089 R)
- M85: 79,669,393 km (0.094 R)
- M86: 80,321,939 km (0.106 R)
- M87: 80,714,334 km (0.106 R)
- M88: 81,632,416 km (0.117 R)
- M89: 86,408,179 km (0.071 R)
- M90: 86,944,338 km (0.101 R)
- M91: 90,728,715 km (0.053 R)
Kuiper Belt
Range: 30 - 46 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 295 - 15,142 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.