Star System Generated (Seed: 1766826373)
Star Details
Spectral Class: M1V
Temperature: 3,483 K
Mass: 0.32 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: 11.3 AU
Planetary System (6 Planets)
Planet 1 - Terrestrial
Semi-Major Axis: 0.65 AU
Status: Outer (Cold)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 2.58
Radius: 1.46
Gravity: 1.21 G
Time & Orbit
Eccentricity (e): 0.242
Orbit Range: 0.49 AU - 0.81 AU
Year: 338 Days
Day: 38.5 Hours
Environment
Temp: -143 °C
Axial Tilt: 13.5 °
Atmosphere: Thin Nâ‚‚/CHâ‚„
Biome: Ice Cap/Desert
Planet 2 - Gas Giant
Semi-Major Axis: 2.07 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 683
Radius: 8.3
Gravity: 9.91 G
Time & Orbit
Eccentricity (e): 0.059
Orbit Range: 1.95 AU - 2.19 AU
Year: 1923 Days
Day: 11.1 Hours
Environment
Temp: -181 °C
Axial Tilt: 15.9 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (75)
Outer Limit: 38,560,572 km
- M1: 112,498 km (0.086 R)
- M2: 165,904 km (0.064 R)
- M3: 220,657 km (0.033 R)
- M4: 365,916 km (0.083 R)
- M5: 475,422 km (0.117 R)
- M6: 1,070,522 km (0.116 R)
- M7: 1,146,368 km (0.101 R)
- M8: 1,283,550 km (0.11 R)
- M9: 1,364,482 km (0.07 R)
- M10: 1,426,266 km (0.103 R)
- M11: 1,478,625 km (0.081 R)
- M12: 1,574,368 km (0.025 R)
- M13: 1,716,486 km (0.087 R)
- M14: 1,862,942 km (0.108 R)
- M15: 2,060,711 km (0.102 R)
- M16: 2,265,510 km (0.093 R)
- M17: 2,617,065 km (0.065 R)
- M18: 2,773,096 km (0.086 R)
- M19: 2,945,582 km (0.069 R)
- M20: 3,053,442 km (0.087 R)
- M21: 3,245,526 km (0.098 R)
- M22: 3,329,151 km (0.038 R)
- M23: 3,569,704 km (0.031 R)
- M24: 3,757,599 km (0.099 R)
- M25: 3,860,223 km (0.057 R)
- M26: 4,068,015 km (0.068 R)
- M27: 4,173,332 km (0.1 R)
- M28: 4,432,884 km (0.05 R)
- M29: 4,510,376 km (0.049 R)
- M30: 4,619,433 km (0.091 R)
- M31: 5,259,412 km (0.105 R)
- M32: 5,341,392 km (0.119 R)
- M33: 5,740,818 km (0.095 R)
- M34: 6,167,172 km (0.069 R)
- M35: 6,358,059 km (0.106 R)
- M36: 6,445,424 km (0.104 R)
- M37: 6,603,699 km (0.094 R)
- M38: 6,656,806 km (0.084 R)
- M39: 6,906,335 km (0.074 R)
- M40: 7,159,006 km (0.105 R)
- M41: 7,580,573 km (0.074 R)
- M42: 7,654,773 km (0.097 R)
- M43: 7,729,124 km (0.101 R)
- M44: 7,785,073 km (0.078 R)
- M45: 8,275,754 km (0.034 R)
- M46: 8,505,537 km (0.085 R)
- M47: 8,602,027 km (0.03 R)
- M48: 8,834,801 km (0.086 R)
- M49: 9,386,219 km (0.091 R)
- M50: 9,565,737 km (0.118 R)
- M51: 9,625,875 km (0.099 R)
- M52: 9,786,842 km (0.087 R)
- M53: 9,948,707 km (0.038 R)
- M54: 10,875,466 km (0.101 R)
- M55: 11,064,109 km (0.097 R)
- M56: 11,466,078 km (0.045 R)
- M57: 11,872,685 km (0.105 R)
- M58: 12,002,237 km (0.062 R)
- M59: 12,218,855 km (0.071 R)
- M60: 12,327,762 km (0.051 R)
- M61: 12,656,279 km (0.08 R)
- M62: 13,344,280 km (0.119 R)
- M63: 13,434,038 km (0.076 R)
- M64: 13,568,826 km (0.064 R)
- M65: 13,726,801 km (0.093 R)
- M66: 13,976,181 km (0.119 R)
- M67: 14,067,286 km (0.106 R)
- M68: 14,135,652 km (0.107 R)
- M69: 14,272,834 km (0.095 R)
- M70: 14,664,032 km (0.094 R)
- M71: 14,733,445 km (0.091 R)
- M72: 15,269,155 km (0.088 R)
- M73: 15,621,907 km (0.084 R)
- M74: 15,858,571 km (0.096 R)
- M75: 15,953,566 km (0.098 R)
Planet 3 - Gas Giant
Semi-Major Axis: 3.63 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 259.2
Radius: 12.5
Gravity: 1.66 G
Time & Orbit
Eccentricity (e): 0.08
Orbit Range: 3.34 AU - 3.92 AU
Year: 4466 Days
Day: 5.2 Hours
Environment
Temp: -208 °C
Axial Tilt: 47.8 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (76)
Outer Limit: 38,560,572 km
- M1: 156,031 km (0.072 R)
- M2: 259,852 km (0.107 R)
- M3: 400,623 km (0.084 R)
- M4: 511,924 km (0.081 R)
- M5: 636,090 km (0.089 R)
- M6: 1,197,082 km (0.108 R)
- M7: 1,833,172 km (0.101 R)
- M8: 1,912,908 km (0.072 R)
- M9: 2,089,733 km (0.094 R)
- M10: 2,173,208 km (0.063 R)
- M11: 2,489,159 km (0.09 R)
- M12: 2,774,143 km (0.096 R)
- M13: 2,912,970 km (0.111 R)
- M14: 3,022,475 km (0.098 R)
- M15: 3,101,613 km (0.109 R)
- M16: 3,425,193 km (0.057 R)
- M17: 3,624,607 km (0.065 R)
- M18: 3,793,802 km (0.093 R)
- M19: 3,913,929 km (0.104 R)
- M20: 4,263,988 km (0.108 R)
- M21: 4,424,806 km (0.118 R)
- M22: 4,605,969 km (0.108 R)
- M23: 4,734,174 km (0.106 R)
- M24: 4,994,475 km (0.071 R)
- M25: 5,088,422 km (0.072 R)
- M26: 5,240,264 km (0.111 R)
- M27: 5,374,304 km (0.103 R)
- M28: 5,665,421 km (0.078 R)
- M29: 6,222,823 km (0.061 R)
- M30: 6,528,750 km (0.091 R)
- M31: 6,756,289 km (0.053 R)
- M32: 6,944,333 km (0.117 R)
- M33: 7,155,416 km (0.044 R)
- M34: 7,497,546 km (0.108 R)
- M35: 7,801,230 km (0.118 R)
- M36: 8,131,243 km (0.104 R)
- M37: 8,465,893 km (0.116 R)
- M38: 8,827,920 km (0.094 R)
- M39: 9,033,767 km (0.061 R)
- M40: 9,567,083 km (0.076 R)
- M41: 9,754,978 km (0.03 R)
- M42: 10,086,786 km (0.114 R)
- M43: 10,325,993 km (0.071 R)
- M44: 10,834,775 km (0.108 R)
- M45: 10,932,612 km (0.091 R)
- M46: 11,500,785 km (0.04 R)
- M47: 11,625,550 km (0.096 R)
- M48: 11,750,913 km (0.04 R)
- M49: 11,851,443 km (0.087 R)
- M50: 12,256,404 km (0.089 R)
- M51: 12,383,861 km (0.075 R)
- M52: 12,588,810 km (0.1 R)
- M53: 13,288,928 km (0.119 R)
- M54: 13,393,647 km (0.091 R)
- M55: 13,656,790 km (0.112 R)
- M56: 13,895,249 km (0.057 R)
- M57: 14,429,762 km (0.044 R)
- M58: 14,645,482 km (0.095 R)
- M59: 15,162,193 km (0.094 R)
- M60: 15,409,029 km (0.051 R)
- M61: 15,684,888 km (0.112 R)
- M62: 15,795,590 km (0.115 R)
- M63: 16,409,690 km (0.092 R)
- M64: 16,663,108 km (0.106 R)
- M65: 17,059,992 km (0.071 R)
- M66: 17,373,998 km (0.117 R)
- M67: 17,661,076 km (0.098 R)
- M68: 17,949,800 km (0.083 R)
- M69: 18,210,998 km (0.1 R)
- M70: 18,356,706 km (0.034 R)
- M71: 18,943,130 km (0.109 R)
- M72: 19,179,494 km (0.079 R)
- M73: 19,268,355 km (0.025 R)
- M74: 19,864,353 km (0.094 R)
- M75: 20,104,458 km (0.061 R)
- M76: 20,224,884 km (0.074 R)
Planet 4 - Gas Giant
Semi-Major Axis: 4.79 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 580.1
Radius: 8.4
Gravity: 8.22 G
Time & Orbit
Eccentricity (e): 0.21
Orbit Range: 3.78 AU - 5.8 AU
Year: 6769 Days
Day: 10.9 Hours
Environment
Temp: -212 °C
Axial Tilt: 4.8 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (85)
Outer Limit: 38,560,572 km
- M1: 105,616 km (0.107 R)
- M2: 181,761 km (0.101 R)
- M3: 342,579 km (0.096 R)
- M4: 415,284 km (0.094 R)
- M5: 541,843 km (0.063 R)
- M6: 629,657 km (0.1 R)
- M7: 820,395 km (0.056 R)
- M8: 1,045,540 km (0.089 R)
- M9: 1,376,151 km (0.104 R)
- M10: 1,644,978 km (0.118 R)
- M11: 2,049,042 km (0.082 R)
- M12: 2,356,166 km (0.099 R)
- M13: 2,440,689 km (0.114 R)
- M14: 2,700,092 km (0.115 R)
- M15: 2,766,364 km (0.097 R)
- M16: 3,175,514 km (0.063 R)
- M17: 3,410,981 km (0.09 R)
- M18: 3,482,788 km (0.101 R)
- M19: 4,540,146 km (0.045 R)
- M20: 5,352,163 km (0.096 R)
- M21: 5,519,862 km (0.096 R)
- M22: 5,689,357 km (0.066 R)
- M23: 5,946,964 km (0.11 R)
- M24: 6,062,603 km (0.119 R)
- M25: 6,296,275 km (0.093 R)
- M26: 6,414,158 km (0.09 R)
- M27: 6,802,514 km (0.037 R)
- M28: 7,075,979 km (0.098 R)
- M29: 7,570,849 km (0.112 R)
- M30: 7,633,531 km (0.1 R)
- M31: 8,496,112 km (0.093 R)
- M32: 8,955,677 km (0.117 R)
- M33: 9,796,117 km (0.033 R)
- M34: 10,208,559 km (0.115 R)
- M35: 10,732,002 km (0.106 R)
- M36: 11,157,009 km (0.111 R)
- M37: 11,407,586 km (0.097 R)
- M38: 11,696,160 km (0.098 R)
- M39: 11,914,124 km (0.103 R)
- M40: 13,024,290 km (0.085 R)
- M41: 13,401,725 km (0.085 R)
- M42: 13,706,307 km (0.065 R)
- M43: 13,897,792 km (0.069 R)
- M44: 14,711,604 km (0.057 R)
- M45: 15,342,159 km (0.09 R)
- M46: 15,620,710 km (0.087 R)
- M47: 16,263,832 km (0.07 R)
- M48: 16,670,140 km (0.048 R)
- M49: 16,751,820 km (0.107 R)
- M50: 17,410,051 km (0.071 R)
- M51: 17,950,996 km (0.093 R)
- M52: 18,034,771 km (0.116 R)
- M53: 18,118,546 km (0.092 R)
- M54: 18,413,104 km (0.093 R)
- M55: 19,348,989 km (0.11 R)
- M56: 19,520,727 km (0.08 R)
- M57: 20,039,233 km (0.095 R)
- M58: 20,126,150 km (0.095 R)
- M59: 20,825,520 km (0.112 R)
- M60: 21,399,676 km (0.111 R)
- M61: 21,488,537 km (0.09 R)
- M62: 21,621,979 km (0.081 R)
- M63: 22,383,133 km (0.088 R)
- M64: 23,016,680 km (0.113 R)
- M65: 23,381,250 km (0.067 R)
- M66: 23,564,357 km (0.099 R)
- M67: 24,116,374 km (0.05 R)
- M68: 24,905,502 km (0.107 R)
- M69: 25,373,744 km (0.106 R)
- M70: 25,609,061 km (0.032 R)
- M71: 25,892,250 km (0.114 R)
- M72: 26,176,486 km (0.118 R)
- M73: 26,319,053 km (0.089 R)
- M74: 26,509,341 km (0.054 R)
- M75: 26,843,692 km (0.09 R)
- M76: 27,516,584 km (0.074 R)
- M77: 29,222,897 km (0.07 R)
- M78: 29,420,216 km (0.113 R)
- M79: 29,865,420 km (0.119 R)
- M80: 30,362,833 km (0.115 R)
- M81: 31,618,258 km (0.06 R)
- M82: 32,941,900 km (0.095 R)
- M83: 33,301,234 km (0.106 R)
- M84: 33,713,675 km (0.083 R)
- M85: 34,647,764 km (0.064 R)
Planet 5 - Ice Giant
Semi-Major Axis: 6 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 930.2
Radius: 7.2
Gravity: 17.94 G
Time & Orbit
Eccentricity (e): 0.078
Orbit Range: 5.53 AU - 6.47 AU
Year: 9489 Days
Day: 17.8 Hours
Environment
Temp: -224 °C
Axial Tilt: 15.6 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (96)
Outer Limit: 38,560,572 km
- M1: 119,529 km (0.081 R)
- M2: 174,282 km (0.078 R)
- M3: 291,865 km (0.068 R)
- M4: 382,372 km (0.046 R)
- M5: 561,740 km (0.116 R)
- M6: 696,228 km (0.101 R)
- M7: 898,634 km (0.08 R)
- M8: 1,037,162 km (0.103 R)
- M9: 1,204,263 km (0.098 R)
- M10: 1,269,188 km (0.047 R)
- M11: 1,830,480 km (0.084 R)
- M12: 1,905,578 km (0.08 R)
- M13: 2,296,776 km (0.063 R)
- M14: 2,378,008 km (0.111 R)
- M15: 2,487,962 km (0.092 R)
- M16: 2,599,413 km (0.111 R)
- M17: 2,712,658 km (0.093 R)
- M18: 3,121,808 km (0.097 R)
- M19: 3,487,874 km (0.116 R)
- M20: 3,932,180 km (0.108 R)
- M21: 4,128,153 km (0.076 R)
- M22: 5,154,993 km (0.112 R)
- M23: 5,550,530 km (0.104 R)
- M24: 6,990,858 km (0.12 R)
- M25: 7,109,190 km (0.111 R)
- M26: 8,246,283 km (0.038 R)
- M27: 8,371,497 km (0.115 R)
- M28: 8,623,719 km (0.071 R)
- M29: 8,835,849 km (0.083 R)
- M30: 9,135,643 km (0.11 R)
- M31: 9,526,093 km (0.034 R)
- M32: 9,613,608 km (0.12 R)
- M33: 10,503,416 km (0.103 R)
- M34: 11,886,748 km (0.113 R)
- M35: 12,360,524 km (0.066 R)
- M36: 12,455,968 km (0.086 R)
- M37: 12,695,773 km (0.12 R)
- M38: 12,937,074 km (0.072 R)
- M39: 12,985,544 km (0.049 R)
- M40: 13,620,886 km (0.075 R)
- M41: 13,768,988 km (0.117 R)
- M42: 13,818,505 km (0.085 R)
- M43: 15,381,354 km (0.102 R)
- M44: 15,638,662 km (0.106 R)
- M45: 15,845,556 km (0.076 R)
- M46: 16,001,287 km (0.119 R)
- M47: 16,893,340 km (0.088 R)
- M48: 17,212,133 km (0.082 R)
- M49: 17,372,202 km (0.115 R)
- M50: 17,586,426 km (0.037 R)
- M51: 17,640,132 km (0.095 R)
- M52: 17,963,413 km (0.108 R)
- M53: 18,780,367 km (0.049 R)
- M54: 19,442,637 km (0.096 R)
- M55: 19,609,438 km (0.112 R)
- M56: 19,665,089 km (0.089 R)
- M57: 20,450,328 km (0.08 R)
- M58: 20,846,762 km (0.056 R)
- M59: 22,051,175 km (0.109 R)
- M60: 24,827,711 km (0.034 R)
- M61: 25,129,600 km (0.092 R)
- M62: 25,858,890 km (0.114 R)
- M63: 25,919,925 km (0.065 R)
- M64: 26,042,297 km (0.062 R)
- M65: 28,591,893 km (0.109 R)
- M66: 28,655,023 km (0.077 R)
- M67: 29,289,318 km (0.061 R)
- M68: 31,415,254 km (0.106 R)
- M69: 32,069,146 km (0.088 R)
- M70: 32,397,812 km (0.117 R)
- M71: 32,859,920 km (0.032 R)
- M72: 33,124,858 km (0.117 R)
- M73: 33,457,115 km (0.117 R)
- M74: 33,857,289 km (0.117 R)
- M75: 34,057,900 km (0.1 R)
- M76: 34,527,637 km (0.106 R)
- M77: 34,999,619 km (0.097 R)
- M78: 35,202,473 km (0.085 R)
- M79: 35,270,241 km (0.119 R)
- M80: 35,473,545 km (0.05 R)
- M81: 37,736,811 km (0.098 R)
- M82: 38,710,992 km (0.084 R)
- M83: 39,061,051 km (0.075 R)
- M84: 39,271,386 km (0.09 R)
- M85: 41,969,832 km (0.1 R)
- M86: 42,689,847 km (0.115 R)
- M87: 42,906,614 km (0.116 R)
- M88: 46,202,106 km (0.06 R)
- M89: 46,350,507 km (0.116 R)
- M90: 46,573,407 km (0.107 R)
- M91: 47,692,848 km (0.108 R)
- M92: 48,218,236 km (0.115 R)
- M93: 49,123,453 km (0.038 R)
- M94: 50,186,645 km (0.033 R)
- M95: 50,415,530 km (0.113 R)
- M96: 50,568,269 km (0.117 R)
Planet 6 - Ice Giant
Semi-Major Axis: 6.41 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 324.8
Radius: 4.6
Gravity: 15.35 G
Time & Orbit
Eccentricity (e): 0.194
Orbit Range: 5.17 AU - 7.65 AU
Year: 10479 Days
Day: 22.2 Hours
Environment
Temp: -227 °C
Axial Tilt: 46.3 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (95)
Outer Limit: 38,560,572 km
- M1: 331,210 km (0.112 R)
- M2: 400,473 km (0.098 R)
- M3: 581,188 km (0.083 R)
- M4: 785,688 km (0.114 R)
- M5: 944,860 km (0.07 R)
- M6: 1,062,294 km (0.09 R)
- M7: 1,598,154 km (0.107 R)
- M8: 1,637,797 km (0.106 R)
- M9: 2,095,717 km (0.107 R)
- M10: 2,384,141 km (0.1 R)
- M11: 2,429,619 km (0.115 R)
- M12: 2,684,833 km (0.119 R)
- M13: 2,900,104 km (0.08 R)
- M14: 3,120,911 km (0.083 R)
- M15: 3,271,257 km (0.09 R)
- M16: 3,321,821 km (0.042 R)
- M17: 3,501,039 km (0.119 R)
- M18: 3,868,900 km (0.117 R)
- M19: 3,949,384 km (0.111 R)
- M20: 4,249,028 km (0.069 R)
- M21: 4,812,414 km (0.03 R)
- M22: 5,044,440 km (0.039 R)
- M23: 5,102,933 km (0.102 R)
- M24: 5,220,816 km (0.1 R)
- M25: 5,339,447 km (0.04 R)
- M26: 5,700,876 km (0.11 R)
- M27: 5,946,216 km (0.11 R)
- M28: 6,039,266 km (0.069 R)
- M29: 6,195,147 km (0.11 R)
- M30: 6,383,940 km (0.12 R)
- M31: 6,735,046 km (0.105 R)
- M32: 7,623,358 km (0.118 R)
- M33: 9,543,297 km (0.082 R)
- M34: 9,834,414 km (0.046 R)
- M35: 10,350,826 km (0.07 R)
- M36: 10,462,725 km (0.079 R)
- M37: 10,687,571 km (0.049 R)
- M38: 10,800,517 km (0.063 R)
- M39: 11,371,682 km (0.11 R)
- M40: 11,409,979 km (0.101 R)
- M41: 11,913,376 km (0.112 R)
- M42: 11,952,421 km (0.073 R)
- M43: 12,030,661 km (0.075 R)
- M44: 13,102,530 km (0.108 R)
- M45: 13,344,728 km (0.11 R)
- M46: 14,328,783 km (0.111 R)
- M47: 14,745,713 km (0.092 R)
- M48: 14,871,524 km (0.118 R)
- M49: 15,039,822 km (0.094 R)
- M50: 16,106,305 km (0.051 R)
- M51: 16,539,690 km (0.077 R)
- M52: 16,845,319 km (0.049 R)
- M53: 17,462,111 km (0.092 R)
- M54: 18,131,262 km (0.118 R)
- M55: 18,176,141 km (0.112 R)
- M56: 18,990,702 km (0.101 R)
- M57: 19,310,692 km (0.063 R)
- M58: 19,632,477 km (0.096 R)
- M59: 19,817,080 km (0.066 R)
- M60: 19,863,456 km (0.11 R)
- M61: 20,984,393 km (0.09 R)
- M62: 21,173,185 km (0.084 R)
- M63: 21,552,565 km (0.057 R)
- M64: 21,838,447 km (0.117 R)
- M65: 22,800,660 km (0.091 R)
- M66: 23,776,786 km (0.088 R)
- M67: 23,825,854 km (0.109 R)
- M68: 24,965,940 km (0.104 R)
- M69: 25,216,067 km (0.096 R)
- M70: 25,467,093 km (0.114 R)
- M71: 25,668,451 km (0.107 R)
- M72: 25,769,430 km (0.083 R)
- M73: 26,836,811 km (0.044 R)
- M74: 26,887,973 km (0.032 R)
- M75: 27,041,760 km (0.104 R)
- M76: 27,814,882 km (0.107 R)
- M77: 27,970,314 km (0.095 R)
- M78: 28,386,495 km (0.102 R)
- M79: 28,542,975 km (0.063 R)
- M80: 28,647,543 km (0.118 R)
- M81: 28,856,980 km (0.102 R)
- M82: 29,014,507 km (0.12 R)
- M83: 30,657,840 km (0.104 R)
- M84: 30,711,246 km (0.082 R)
- M85: 32,276,638 km (0.108 R)
- M86: 32,603,809 km (0.102 R)
- M87: 32,713,015 km (0.097 R)
- M88: 33,481,350 km (0.087 R)
- M89: 33,646,805 km (0.096 R)
- M90: 34,812,322 km (0.085 R)
- M91: 36,330,292 km (0.115 R)
- M92: 36,556,932 km (0.075 R)
- M93: 36,613,630 km (0.092 R)
- M94: 37,525,728 km (0.096 R)
- M95: 38,041,991 km (0.09 R)
Kuiper Belt
Range: 30 - 58 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 226 - 16,127 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.