Star System Generated (Seed: 1768351014)
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 (5 Planets)
Asteroid Belt
Center: 0.63 AU
Composition
Type: Main (Rocky/Icy Mix)
A dense region of planetesimals and debris.
Boundary
Planet 1 - Gas Giant
Semi-Major Axis: 1.26 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 575.6
Radius: 8.4
Gravity: 8.16 G
Time & Orbit
Eccentricity (e): 0.198
Orbit Range: 1.01 AU - 1.51 AU
Year: 943 Days
Day: 11.3 Hours
Environment
Temp: -182 °C
Axial Tilt: 36.5 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (64)
Outer Limit: 65,665,410 km
- M1: 108,758 km (0.11 R)
- M2: 170,392 km (0.06 R)
- M3: 233,971 km (0.089 R)
- M4: 334,202 km (0.068 R)
- M5: 451,786 km (0.087 R)
- M6: 626,815 km (0.118 R)
- M7: 720,015 km (0.111 R)
- M8: 865,872 km (0.093 R)
- M9: 983,606 km (0.047 R)
- M10: 1,120,039 km (0.027 R)
- M11: 1,194,090 km (0.09 R)
- M12: 1,311,973 km (0.108 R)
- M13: 1,397,394 km (0.113 R)
- M14: 1,455,587 km (0.072 R)
- M15: 1,574,368 km (0.103 R)
- M16: 1,688,661 km (0.09 R)
- M17: 1,789,939 km (0.091 R)
- M18: 2,007,005 km (0.094 R)
- M19: 2,081,355 km (0.083 R)
- M20: 2,139,698 km (0.1 R)
- M21: 2,207,167 km (0.045 R)
- M22: 2,475,396 km (0.087 R)
- M23: 2,555,281 km (0.082 R)
- M24: 2,699,494 km (0.079 R)
- M25: 2,818,573 km (0.052 R)
- M26: 2,883,499 km (0.111 R)
- M27: 2,958,148 km (0.041 R)
- M28: 3,033,695 km (0.055 R)
- M29: 3,351,591 km (0.095 R)
- M30: 3,420,406 km (0.102 R)
- M31: 3,609,647 km (0.096 R)
- M32: 4,019,396 km (0.091 R)
- M33: 4,155,829 km (0.118 R)
- M34: 4,208,637 km (0.115 R)
- M35: 4,283,137 km (0.09 R)
- M36: 4,390,099 km (0.117 R)
- M37: 4,465,646 km (0.035 R)
- M38: 4,574,104 km (0.071 R)
- M39: 5,005,994 km (0.104 R)
- M40: 5,221,115 km (0.099 R)
- M41: 5,289,781 km (0.072 R)
- M42: 5,427,860 km (0.114 R)
- M43: 5,590,323 km (0.039 R)
- M44: 5,731,094 km (0.089 R)
- M45: 5,813,672 km (0.038 R)
- M46: 6,075,768 km (0.104 R)
- M47: 6,268,899 km (0.101 R)
- M48: 6,488,658 km (0.059 R)
- M49: 6,587,093 km (0.083 R)
- M50: 6,686,127 km (0.094 R)
- M51: 6,885,541 km (0.079 R)
- M52: 7,036,485 km (0.059 R)
- M53: 7,188,477 km (0.111 R)
- M54: 7,508,467 km (0.094 R)
- M55: 7,573,093 km (0.101 R)
- M56: 7,689,779 km (0.108 R)
- M57: 7,872,588 km (0.102 R)
- M58: 8,004,084 km (0.086 R)
- M59: 8,136,179 km (0.115 R)
- M60: 8,456,468 km (0.062 R)
- M61: 8,672,189 km (0.107 R)
- M62: 8,862,477 km (0.101 R)
- M63: 9,081,638 km (0.074 R)
- M64: 9,219,567 km (0.096 R)
Planet 2 - Ice Giant
Semi-Major Axis: 6.35 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 664.1
Radius: 7.7
Gravity: 11.2 G
Time & Orbit
Eccentricity (e): 0.241
Orbit Range: 4.82 AU - 7.88 AU
Year: 10671 Days
Day: 22.2 Hours
Environment
Temp: -237 °C
Axial Tilt: 8.4 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (90)
Outer Limit: 65,665,410 km
- M1: 103,821 km (0.117 R)
- M2: 225,294 km (0.076 R)
- M3: 392,096 km (0.118 R)
- M4: 599,588 km (0.077 R)
- M5: 1,050,925 km (0.116 R)
- M6: 1,193,641 km (0.097 R)
- M7: 2,440,091 km (0.045 R)
- M8: 2,548,250 km (0.116 R)
- M9: 2,658,055 km (0.064 R)
- M10: 2,939,449 km (0.08 R)
- M11: 3,409,635 km (0.051 R)
- M12: 4,093,895 km (0.031 R)
- M13: 4,353,298 km (0.119 R)
- M14: 4,651,297 km (0.084 R)
- M15: 5,656,595 km (0.083 R)
- M16: 5,800,358 km (0.12 R)
- M17: 6,054,974 km (0.082 R)
- M18: 7,303,817 km (0.077 R)
- M19: 7,499,940 km (0.082 R)
- M20: 7,777,294 km (0.032 R)
- M21: 9,045,884 km (0.064 R)
- M22: 9,725,358 km (0.066 R)
- M23: 11,133,373 km (0.033 R)
- M24: 11,586,205 km (0.102 R)
- M25: 11,723,387 km (0.12 R)
- M26: 11,906,943 km (0.087 R)
- M27: 12,416,623 km (0.09 R)
- M28: 12,650,744 km (0.093 R)
- M29: 13,028,329 km (0.089 R)
- M30: 13,361,783 km (0.084 R)
- M31: 13,553,567 km (0.071 R)
- M32: 13,794,569 km (0.113 R)
- M33: 14,477,035 km (0.081 R)
- M34: 15,170,421 km (0.097 R)
- M35: 15,370,583 km (0.059 R)
- M36: 15,925,292 km (0.086 R)
- M37: 16,486,733 km (0.108 R)
- M38: 16,744,041 km (0.117 R)
- M39: 16,847,263 km (0.116 R)
- M40: 17,997,521 km (0.091 R)
- M41: 18,849,930 km (0.108 R)
- M42: 18,957,341 km (0.066 R)
- M43: 19,119,057 km (0.113 R)
- M44: 19,335,226 km (0.102 R)
- M45: 21,428,848 km (0.094 R)
- M46: 21,541,046 km (0.115 R)
- M47: 21,597,295 km (0.113 R)
- M48: 22,104,881 km (0.112 R)
- M49: 23,362,400 km (0.11 R)
- M50: 23,420,145 km (0.062 R)
- M51: 24,174,717 km (0.037 R)
- M52: 24,584,316 km (0.114 R)
- M53: 25,114,341 km (0.111 R)
- M54: 25,291,764 km (0.093 R)
- M55: 25,648,106 km (0.09 R)
- M56: 26,908,019 km (0.088 R)
- M57: 26,968,457 km (0.119 R)
- M58: 27,150,368 km (0.109 R)
- M59: 27,515,088 km (0.109 R)
- M60: 27,575,974 km (0.087 R)
- M61: 27,698,046 km (0.056 R)
- M62: 29,176,522 km (0.079 R)
- M63: 30,176,434 km (0.114 R)
- M64: 30,491,188 km (0.065 R)
- M65: 31,505,760 km (0.115 R)
- M66: 31,633,367 km (0.085 R)
- M67: 32,209,618 km (0.08 R)
- M68: 32,338,123 km (0.034 R)
- M69: 32,402,450 km (0.088 R)
- M70: 32,595,730 km (0.111 R)
- M71: 34,615,152 km (0.09 R)
- M72: 36,741,835 km (0.115 R)
- M73: 36,943,344 km (0.084 R)
- M74: 39,458,982 km (0.086 R)
- M75: 41,538,990 km (0.086 R)
- M76: 43,370,367 km (0.11 R)
- M77: 44,224,422 km (0.056 R)
- M78: 44,367,288 km (0.046 R)
- M79: 45,732,368 km (0.077 R)
- M80: 45,949,136 km (0.031 R)
- M81: 46,311,312 km (0.069 R)
- M82: 46,383,867 km (0.116 R)
- M83: 46,456,422 km (0.053 R)
- M84: 46,528,977 km (0.083 R)
- M85: 46,674,386 km (0.103 R)
- M86: 47,111,212 km (0.114 R)
- M87: 47,184,216 km (0.08 R)
- M88: 47,257,219 km (0.107 R)
- M89: 49,093,982 km (0.073 R)
- M90: 49,538,288 km (0.073 R)
Planet 3 - Ice Giant
Semi-Major Axis: 6.69 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 858.8
Radius: 5.8
Gravity: 25.53 G
Time & Orbit
Eccentricity (e): 0.222
Orbit Range: 5.2 AU - 8.18 AU
Year: 11539 Days
Day: 23 Hours
Environment
Temp: -230 °C
Axial Tilt: 38.5 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (95)
Outer Limit: 65,665,410 km
- M1: 77,193 km (0.06 R)
- M2: 270,174 km (0.069 R)
- M3: 310,266 km (0.06 R)
- M4: 632,350 km (0.1 R)
- M5: 1,101,489 km (0.036 R)
- M6: 1,192,145 km (0.086 R)
- M7: 1,238,521 km (0.101 R)
- M8: 1,405,622 km (0.094 R)
- M9: 1,656,796 km (0.079 R)
- M10: 1,787,695 km (0.084 R)
- M11: 2,059,813 km (0.095 R)
- M12: 2,229,307 km (0.077 R)
- M13: 2,581,910 km (0.069 R)
- M14: 2,889,034 km (0.063 R)
- M15: 3,015,145 km (0.104 R)
- M16: 3,207,678 km (0.081 R)
- M17: 3,571,200 km (0.051 R)
- M18: 4,849,813 km (0.067 R)
- M19: 5,459,275 km (0.111 R)
- M20: 5,498,171 km (0.107 R)
- M21: 5,693,994 km (0.105 R)
- M22: 5,772,982 km (0.113 R)
- M23: 5,812,625 km (0.047 R)
- M24: 6,541,466 km (0.043 R)
- M25: 6,665,782 km (0.101 R)
- M26: 6,790,846 km (0.119 R)
- M27: 7,298,880 km (0.089 R)
- M28: 7,384,749 km (0.09 R)
- M29: 7,470,918 km (0.069 R)
- M30: 7,514,151 km (0.085 R)
- M31: 7,600,918 km (0.11 R)
- M32: 8,172,532 km (0.112 R)
- M33: 8,712,430 km (0.037 R)
- M34: 9,310,373 km (0.066 R)
- M35: 9,590,719 km (0.119 R)
- M36: 9,731,940 km (0.093 R)
- M37: 9,968,903 km (0.115 R)
- M38: 10,111,918 km (0.112 R)
- M39: 11,281,026 km (0.113 R)
- M40: 11,881,362 km (0.094 R)
- M41: 11,931,926 km (0.072 R)
- M42: 12,492,170 km (0.076 R)
- M43: 13,008,881 km (0.114 R)
- M44: 13,532,623 km (0.092 R)
- M45: 14,384,882 km (0.102 R)
- M46: 14,708,911 km (0.114 R)
- M47: 15,364,150 km (0.048 R)
- M48: 15,529,456 km (0.044 R)
- M49: 16,590,105 km (0.091 R)
- M50: 16,759,749 km (0.083 R)
- M51: 16,816,446 km (0.045 R)
- M52: 16,929,991 km (0.11 R)
- M53: 17,157,829 km (0.107 R)
- M54: 18,839,458 km (0.09 R)
- M55: 19,075,524 km (0.104 R)
- M56: 19,194,005 km (0.087 R)
- M57: 19,729,865 km (0.063 R)
- M58: 19,849,543 km (0.045 R)
- M59: 22,983,469 km (0.12 R)
- M60: 23,235,691 km (0.102 R)
- M61: 23,615,819 km (0.037 R)
- M62: 23,806,556 km (0.081 R)
- M63: 23,870,285 km (0.056 R)
- M64: 24,768,321 km (0.087 R)
- M65: 25,026,976 km (0.091 R)
- M66: 25,286,378 km (0.091 R)
- M67: 25,873,550 km (0.107 R)
- M68: 26,729,549 km (0.094 R)
- M69: 27,795,733 km (0.107 R)
- M70: 28,469,073 km (0.073 R)
- M71: 29,420,964 km (0.093 R)
- M72: 29,900,725 km (0.118 R)
- M73: 31,007,151 km (0.052 R)
- M74: 31,146,426 km (0.069 R)
- M75: 32,267,812 km (0.116 R)
- M76: 33,259,795 km (0.066 R)
- M77: 34,333,908 km (0.1 R)
- M78: 39,720,329 km (0.107 R)
- M79: 40,554,487 km (0.069 R)
- M80: 42,240,156 km (0.119 R)
- M81: 42,394,391 km (0.105 R)
- M82: 44,183,133 km (0.056 R)
- M83: 44,810,995 km (0.039 R)
- M84: 45,283,874 km (0.111 R)
- M85: 46,234,568 km (0.036 R)
- M86: 48,236,337 km (0.1 R)
- M87: 48,720,885 km (0.098 R)
- M88: 49,694,917 km (0.084 R)
- M89: 50,839,340 km (0.116 R)
- M90: 50,921,470 km (0.058 R)
- M91: 51,579,700 km (0.115 R)
- M92: 51,909,863 km (0.084 R)
- M93: 52,738,336 km (0.083 R)
- M94: 54,744,593 km (0.045 R)
- M95: 56,605,441 km (0.073 R)
Planet 4 - Ice Giant
Semi-Major Axis: 7.54 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 319.6
Radius: 4.2
Gravity: 18.12 G
Time & Orbit
Eccentricity (e): 0.192
Orbit Range: 6.09 AU - 8.99 AU
Year: 13807 Days
Day: 15.7 Hours
Environment
Temp: -240 °C
Axial Tilt: 12.7 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (93)
Outer Limit: 65,665,410 km
- M1: 68,516 km (0.09 R)
- M2: 256,560 km (0.107 R)
- M3: 340,934 km (0.11 R)
- M4: 379,979 km (0.102 R)
- M5: 614,099 km (0.097 R)
- M6: 662,419 km (0.081 R)
- M7: 850,763 km (0.089 R)
- M8: 960,418 km (0.073 R)
- M9: 1,074,562 km (0.088 R)
- M10: 1,153,250 km (0.083 R)
- M11: 1,358,049 km (0.105 R)
- M12: 1,596,508 km (0.113 R)
- M13: 1,663,828 km (0.079 R)
- M14: 1,754,933 km (0.113 R)
- M15: 2,185,475 km (0.079 R)
- M16: 2,620,805 km (0.057 R)
- M17: 2,700,391 km (0.043 R)
- M18: 4,017,002 km (0.107 R)
- M19: 4,201,456 km (0.104 R)
- M20: 4,514,864 km (0.109 R)
- M21: 4,900,976 km (0.108 R)
- M22: 5,164,268 km (0.119 R)
- M23: 5,499,667 km (0.049 R)
- M24: 5,533,625 km (0.075 R)
- M25: 5,567,734 km (0.051 R)
- M26: 5,876,952 km (0.118 R)
- M27: 6,801,168 km (0.085 R)
- M28: 7,168,580 km (0.109 R)
- M29: 7,655,821 km (0.06 R)
- M30: 7,922,703 km (0.07 R)
- M31: 7,961,000 km (0.11 R)
- M32: 7,999,447 km (0.114 R)
- M33: 8,115,086 km (0.118 R)
- M34: 9,180,522 km (0.107 R)
- M35: 9,342,088 km (0.111 R)
- M36: 9,545,391 km (0.088 R)
- M37: 9,832,320 km (0.08 R)
- M38: 10,541,264 km (0.061 R)
- M39: 10,667,974 km (0.12 R)
- M40: 11,137,262 km (0.068 R)
- M41: 11,439,450 km (0.107 R)
- M42: 12,629,651 km (0.107 R)
- M43: 12,674,530 km (0.108 R)
- M44: 12,809,467 km (0.11 R)
- M45: 13,262,300 km (0.095 R)
- M46: 13,582,439 km (0.08 R)
- M47: 14,746,461 km (0.111 R)
- M48: 15,604,105 km (0.115 R)
- M49: 16,136,225 km (0.116 R)
- M50: 17,118,784 km (0.096 R)
- M51: 17,218,117 km (0.107 R)
- M52: 17,517,163 km (0.062 R)
- M53: 17,717,624 km (0.104 R)
- M54: 18,323,196 km (0.071 R)
- M55: 19,399,253 km (0.05 R)
- M56: 21,451,437 km (0.115 R)
- M57: 21,504,993 km (0.031 R)
- M58: 21,558,549 km (0.111 R)
- M59: 22,911,961 km (0.076 R)
- M60: 26,327,879 km (0.109 R)
- M61: 26,557,362 km (0.097 R)
- M62: 28,652,331 km (0.046 R)
- M63: 28,711,272 km (0.1 R)
- M64: 28,770,363 km (0.104 R)
- M65: 29,006,728 km (0.065 R)
- M66: 29,125,060 km (0.088 R)
- M67: 29,898,780 km (0.064 R)
- M68: 30,078,297 km (0.108 R)
- M69: 30,258,114 km (0.086 R)
- M70: 30,318,103 km (0.112 R)
- M71: 31,892,770 km (0.077 R)
- M72: 32,137,363 km (0.108 R)
- M73: 32,628,492 km (0.117 R)
- M74: 33,680,315 km (0.058 R)
- M75: 33,991,778 km (0.056 R)
- M76: 34,179,074 km (0.112 R)
- M77: 34,492,183 km (0.119 R)
- M78: 34,743,208 km (0.059 R)
- M79: 36,198,646 km (0.073 R)
- M80: 36,965,933 km (0.078 R)
- M81: 37,030,111 km (0.034 R)
- M82: 38,062,037 km (0.052 R)
- M83: 38,646,516 km (0.078 R)
- M84: 38,711,740 km (0.115 R)
- M85: 39,693,102 km (0.04 R)
- M86: 40,881,657 km (0.113 R)
- M87: 41,147,343 km (0.113 R)
- M88: 41,413,627 km (0.075 R)
- M89: 41,613,789 km (0.067 R)
- M90: 43,361,242 km (0.116 R)
- M91: 44,107,735 km (0.1 R)
- M92: 44,243,869 km (0.117 R)
- M93: 45,613,438 km (0.111 R)
Planet 5 - Ice Giant
Semi-Major Axis: 10.53 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 339.2
Radius: 3.1
Gravity: 35.3 G
Time & Orbit
Eccentricity (e): 0.072
Orbit Range: 9.77 AU - 11.29 AU
Year: 22786 Days
Day: 20.1 Hours
Environment
Temp: -226 °C
Axial Tilt: 18.8 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (94)
Outer Limit: 65,665,410 km
- M1: 184,005 km (0.067 R)
- M2: 505,641 km (0.104 R)
- M3: 543,938 km (0.104 R)
- M4: 1,151,305 km (0.099 R)
- M5: 1,253,929 km (0.101 R)
- M6: 1,495,829 km (0.102 R)
- M7: 1,722,619 km (0.118 R)
- M8: 2,271,494 km (0.118 R)
- M9: 2,531,346 km (0.033 R)
- M10: 2,564,556 km (0.028 R)
- M11: 2,973,706 km (0.12 R)
- M12: 3,114,628 km (0.082 R)
- M13: 3,221,740 km (0.056 R)
- M14: 3,257,643 km (0.099 R)
- M15: 3,587,357 km (0.117 R)
- M16: 4,043,331 km (0.051 R)
- M17: 4,517,257 km (0.112 R)
- M18: 4,638,581 km (0.055 R)
- M19: 5,218,273 km (0.115 R)
- M20: 5,260,609 km (0.103 R)
- M21: 5,473,636 km (0.114 R)
- M22: 6,580,960 km (0.048 R)
- M23: 7,277,488 km (0.109 R)
- M24: 7,802,875 km (0.111 R)
- M25: 7,997,053 km (0.082 R)
- M26: 8,291,163 km (0.092 R)
- M27: 8,638,828 km (0.103 R)
- M28: 9,143,571 km (0.032 R)
- M29: 11,918,313 km (0.026 R)
- M30: 12,422,906 km (0.036 R)
- M31: 12,934,531 km (0.092 R)
- M32: 12,991,827 km (0.066 R)
- M33: 14,154,951 km (0.053 R)
- M34: 15,229,811 km (0.067 R)
- M35: 17,330,465 km (0.049 R)
- M36: 17,583,584 km (0.076 R)
- M37: 18,157,442 km (0.115 R)
- M38: 18,607,881 km (0.117 R)
- M39: 20,246,875 km (0.112 R)
- M40: 22,548,588 km (0.116 R)
- M41: 23,380,502 km (0.09 R)
- M42: 23,450,214 km (0.099 R)
- M43: 23,520,076 km (0.025 R)
- M44: 23,870,435 km (0.051 R)
- M45: 24,011,057 km (0.045 R)
- M46: 25,002,891 km (0.085 R)
- M47: 25,288,772 km (0.047 R)
- M48: 26,442,920 km (0.067 R)
- M49: 26,953,348 km (0.094 R)
- M50: 27,099,654 km (0.098 R)
- M51: 27,983,628 km (0.082 R)
- M52: 29,101,872 km (0.119 R)
- M53: 29,176,970 km (0.05 R)
- M54: 29,477,961 km (0.119 R)
- M55: 29,553,209 km (0.071 R)
- M56: 29,931,243 km (0.118 R)
- M57: 30,615,503 km (0.118 R)
- M58: 31,151,213 km (0.115 R)
- M59: 31,381,744 km (0.093 R)
- M60: 33,718,313 km (0.088 R)
- M61: 35,066,938 km (0.08 R)
- M62: 35,627,481 km (0.11 R)
- M63: 36,029,600 km (0.055 R)
- M64: 36,271,500 km (0.109 R)
- M65: 36,352,283 km (0.09 R)
- M66: 36,757,094 km (0.112 R)
- M67: 37,082,171 km (0.108 R)
- M68: 38,638,587 km (0.108 R)
- M69: 38,803,593 km (0.057 R)
- M70: 40,802,670 km (0.097 R)
- M71: 44,553,687 km (0.05 R)
- M72: 44,813,389 km (0.091 R)
- M73: 47,792,032 km (0.075 R)
- M74: 47,969,156 km (0.117 R)
- M75: 49,036,836 km (0.041 R)
- M76: 50,022,536 km (0.027 R)
- M77: 50,924,162 km (0.037 R)
- M78: 52,104,340 km (0.099 R)
- M79: 52,835,126 km (0.096 R)
- M80: 54,122,116 km (0.047 R)
- M81: 54,862,027 km (0.099 R)
- M82: 55,605,379 km (0.072 R)
- M83: 55,885,127 km (0.12 R)
- M84: 55,978,326 km (0.104 R)
- M85: 56,165,174 km (0.063 R)
- M86: 56,820,562 km (0.118 R)
- M87: 57,572,591 km (0.031 R)
- M88: 58,044,273 km (0.115 R)
- M89: 59,944,016 km (0.076 R)
- M90: 60,039,460 km (0.093 R)
- M91: 60,709,509 km (0.095 R)
- M92: 62,153,577 km (0.097 R)
- M93: 62,831,405 km (0.099 R)
- M94: 65,370,380 km (0.088 R)
Kuiper Belt
Range: 30 - 49 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 505 - 12,809 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.