G0V Star System Generated (Seed: 1766916268)
Star Details
Spectral Class: G8V
Temperature: 5,360 K
Mass: 0.94 sol
Luminosity: 0.81 lux
Habitable Zone (HZ)
Inner Boundary: 0.86 AU
Outer Boundary: 1.24 AU
Physical Limits
Snow Line: 4.32 AU
Max System Radius: 19.4 AU
Planetary System (7 Planets)
Planet 1 - Terrestrial
Semi-Major Axis: 0.5 AU
Status: Inner (Hot)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 0.46
Radius: 0.73
Gravity: 0.86 G
Time & Orbit
Eccentricity (e): 0.004
Orbit Range: 0.5 AU - 0.5 AU
Year: 133 Days
Day: 17.1 Hours
Environment
Temp: 171 °C
Axial Tilt: 22.3 °
Atmosphere: Dense COâ‚‚
Biome: Volcanic/Barren
Planet 2 - Terrestrial
Semi-Major Axis: 1.04 AU
Status: HZ
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 4.56
Radius: 1.83
Gravity: 1.36 G
Time & Orbit
Eccentricity (e): 0.063
Orbit Range: 0.97 AU - 1.11 AU
Year: 400 Days
Day: 46.1 Hours
Environment
Temp: 4 °C
Axial Tilt: 2 °
Atmosphere: Nâ‚‚, Oâ‚‚
Biome: Arid/Tundra
Planet 3 - Gas Giant
Semi-Major Axis: 7.25 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 715.2
Radius: 15
Gravity: 3.18 G
Time & Orbit
Eccentricity (e): 0.166
Orbit Range: 6.05 AU - 8.45 AU
Year: 7354 Days
Day: 14.4 Hours
Environment
Temp: -159 °C
Axial Tilt: 45.7 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (82)
Outer Limit: 75,846,069 km
- M1: 192,981 km (0.093 R)
- M2: 422,913 km (0.097 R)
- M3: 588,368 km (0.087 R)
- M4: 695,181 km (0.098 R)
- M5: 885,769 km (0.05 R)
- M6: 1,062,145 km (0.112 R)
- M7: 1,163,722 km (0.093 R)
- M8: 1,304,942 km (0.043 R)
- M9: 1,866,832 km (0.112 R)
- M10: 2,592,830 km (0.098 R)
- M11: 2,781,473 km (0.115 R)
- M12: 2,877,665 km (0.064 R)
- M13: 3,098,022 km (0.108 R)
- M14: 3,223,086 km (0.039 R)
- M15: 3,349,646 km (0.087 R)
- M16: 3,452,270 km (0.08 R)
- M17: 3,608,151 km (0.059 R)
- M18: 3,819,832 km (0.097 R)
- M19: 4,283,286 km (0.059 R)
- M20: 4,395,036 km (0.094 R)
- M21: 4,536,107 km (0.111 R)
- M22: 4,997,766 km (0.113 R)
- M23: 5,384,177 km (0.1 R)
- M24: 5,535,420 km (0.116 R)
- M25: 6,217,736 km (0.034 R)
- M26: 6,312,881 km (0.075 R)
- M27: 6,763,320 km (0.064 R)
- M28: 6,926,830 km (0.086 R)
- M29: 7,091,687 km (0.062 R)
- M30: 7,593,887 km (0.056 R)
- M31: 7,695,763 km (0.092 R)
- M32: 7,832,197 km (0.115 R)
- M33: 8,386,457 km (0.108 R)
- M34: 8,597,689 km (0.097 R)
- M35: 9,061,293 km (0.04 R)
- M36: 9,205,505 km (0.068 R)
- M37: 9,350,615 km (0.083 R)
- M38: 9,975,784 km (0.11 R)
- M39: 10,237,132 km (0.094 R)
- M40: 10,538,572 km (0.102 R)
- M41: 11,538,783 km (0.114 R)
- M42: 11,931,627 km (0.07 R)
- M43: 12,209,131 km (0.12 R)
- M44: 12,649,697 km (0.071 R)
- M45: 12,851,654 km (0.089 R)
- M46: 13,711,842 km (0.105 R)
- M47: 14,002,660 km (0.085 R)
- M48: 14,211,648 km (0.113 R)
- M49: 14,421,684 km (0.065 R)
- M50: 14,590,580 km (0.059 R)
- M51: 14,802,410 km (0.086 R)
- M52: 16,844,271 km (0.069 R)
- M53: 17,514,320 km (0.068 R)
- M54: 17,694,586 km (0.103 R)
- M55: 18,056,762 km (0.11 R)
- M56: 19,250,852 km (0.107 R)
- M57: 19,530,152 km (0.109 R)
- M58: 20,660,364 km (0.1 R)
- M59: 20,994,116 km (0.047 R)
- M60: 21,763,498 km (0.075 R)
- M61: 22,640,142 km (0.087 R)
- M62: 22,836,564 km (0.099 R)
- M63: 22,984,217 km (0.104 R)
- M64: 23,528,454 km (0.088 R)
- M65: 23,777,086 km (0.105 R)
- M66: 23,926,833 km (0.071 R)
- M67: 25,135,584 km (0.058 R)
- M68: 25,901,076 km (0.114 R)
- M69: 26,622,437 km (0.117 R)
- M70: 27,246,111 km (0.119 R)
- M71: 27,612,177 km (0.115 R)
- M72: 33,016,250 km (0.11 R)
- M73: 33,518,301 km (0.115 R)
- M74: 34,191,641 km (0.056 R)
- M75: 36,180,993 km (0.052 R)
- M76: 36,468,371 km (0.066 R)
- M77: 36,929,581 km (0.061 R)
- M78: 37,392,586 km (0.096 R)
- M79: 37,799,492 km (0.107 R)
- M80: 38,149,402 km (0.065 R)
- M81: 38,676,286 km (0.113 R)
- M82: 39,441,479 km (0.118 R)
Planet 4 - Gas Giant
Semi-Major Axis: 10.45 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 980
Radius: 13.8
Gravity: 5.15 G
Time & Orbit
Eccentricity (e): 0.047
Orbit Range: 9.96 AU - 10.94 AU
Year: 12726 Days
Day: 5.4 Hours
Environment
Temp: -187 °C
Axial Tilt: 39.3 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (87)
Outer Limit: 75,846,069 km
- M1: 216,917 km (0.051 R)
- M2: 350,508 km (0.113 R)
- M3: 452,234 km (0.111 R)
- M4: 550,819 km (0.034 R)
- M5: 816,206 km (0.073 R)
- M6: 1,419,235 km (0.096 R)
- M7: 1,766,900 km (0.077 R)
- M8: 2,801,071 km (0.112 R)
- M9: 3,170,876 km (0.084 R)
- M10: 3,344,260 km (0.098 R)
- M11: 3,485,182 km (0.099 R)
- M12: 3,628,197 km (0.04 R)
- M13: 3,920,212 km (0.108 R)
- M14: 4,882,127 km (0.05 R)
- M15: 5,410,506 km (0.102 R)
- M16: 5,702,521 km (0.085 R)
- M17: 5,829,380 km (0.111 R)
- M18: 6,389,923 km (0.07 R)
- M19: 7,148,983 km (0.07 R)
- M20: 7,562,621 km (0.106 R)
- M21: 8,031,311 km (0.078 R)
- M22: 9,095,551 km (0.082 R)
- M23: 9,393,549 km (0.088 R)
- M24: 10,101,447 km (0.079 R)
- M25: 10,358,456 km (0.103 R)
- M26: 10,513,738 km (0.107 R)
- M27: 10,669,769 km (0.113 R)
- M28: 10,931,565 km (0.107 R)
- M29: 11,301,670 km (0.097 R)
- M30: 12,878,581 km (0.052 R)
- M31: 13,551,323 km (0.111 R)
- M32: 13,721,266 km (0.095 R)
- M33: 14,006,101 km (0.055 R)
- M34: 14,120,543 km (0.119 R)
- M35: 15,282,619 km (0.073 R)
- M36: 16,838,886 km (0.054 R)
- M37: 17,205,251 km (0.066 R)
- M38: 18,007,993 km (0.072 R)
- M39: 18,822,853 km (0.086 R)
- M40: 18,949,263 km (0.074 R)
- M41: 19,203,131 km (0.109 R)
- M42: 19,778,185 km (0.109 R)
- M43: 20,100,120 km (0.097 R)
- M44: 22,001,508 km (0.08 R)
- M45: 22,737,680 km (0.107 R)
- M46: 23,278,027 km (0.111 R)
- M47: 23,481,929 km (0.117 R)
- M48: 23,822,863 km (0.096 R)
- M49: 24,994,363 km (0.096 R)
- M50: 25,272,765 km (0.114 R)
- M51: 25,552,214 km (0.117 R)
- M52: 25,762,399 km (0.1 R)
- M53: 26,043,643 km (0.094 R)
- M54: 29,791,219 km (0.104 R)
- M55: 30,456,780 km (0.101 R)
- M56: 31,652,067 km (0.104 R)
- M57: 31,953,357 km (0.094 R)
- M58: 32,255,545 km (0.071 R)
- M59: 33,780,845 km (0.061 R)
- M60: 34,165,760 km (0.082 R)
- M61: 34,862,437 km (0.09 R)
- M62: 35,485,662 km (0.051 R)
- M63: 35,641,992 km (0.06 R)
- M64: 36,348,543 km (0.065 R)
- M65: 38,978,473 km (0.049 R)
- M66: 39,382,238 km (0.084 R)
- M67: 40,683,739 km (0.086 R)
- M68: 40,847,549 km (0.071 R)
- M69: 42,745,647 km (0.109 R)
- M70: 42,912,000 km (0.076 R)
- M71: 43,245,453 km (0.067 R)
- M72: 43,915,053 km (0.072 R)
- M73: 45,434,070 km (0.093 R)
- M74: 48,263,265 km (0.09 R)
- M75: 49,044,764 km (0.115 R)
- M76: 50,356,588 km (0.06 R)
- M77: 50,796,406 km (0.112 R)
- M78: 51,414,395 km (0.095 R)
- M79: 53,910,734 km (0.067 R)
- M80: 54,000,643 km (0.113 R)
- M81: 56,903,440 km (0.076 R)
- M82: 57,361,658 km (0.073 R)
- M83: 60,042,751 km (0.063 R)
- M84: 60,976,840 km (0.098 R)
- M85: 61,070,488 km (0.048 R)
- M86: 61,915,716 km (0.072 R)
- M87: 63,143,316 km (0.115 R)
Planet 5 - Gas Giant
Semi-Major Axis: 11.46 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 765.2
Radius: 14.4
Gravity: 3.69 G
Time & Orbit
Eccentricity (e): 0.226
Orbit Range: 8.87 AU - 14.05 AU
Year: 14615 Days
Day: 5.3 Hours
Environment
Temp: -183 °C
Axial Tilt: 17.9 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (85)
Outer Limit: 75,846,069 km
- M1: 373,396 km (0.106 R)
- M2: 579,542 km (0.06 R)
- M3: 1,025,493 km (0.107 R)
- M4: 1,189,153 km (0.109 R)
- M5: 2,019,870 km (0.119 R)
- M6: 2,573,233 km (0.116 R)
- M7: 2,934,362 km (0.076 R)
- M8: 3,382,557 km (0.042 R)
- M9: 4,382,470 km (0.063 R)
- M10: 5,056,857 km (0.056 R)
- M11: 5,344,085 km (0.097 R)
- M12: 5,764,006 km (0.071 R)
- M13: 6,021,015 km (0.028 R)
- M14: 6,457,990 km (0.118 R)
- M15: 6,860,110 km (0.117 R)
- M16: 7,735,855 km (0.074 R)
- M17: 9,795,070 km (0.076 R)
- M18: 10,051,032 km (0.109 R)
- M19: 10,205,716 km (0.076 R)
- M20: 10,361,149 km (0.078 R)
- M21: 10,622,047 km (0.115 R)
- M22: 11,043,913 km (0.049 R)
- M23: 11,256,941 km (0.073 R)
- M24: 11,417,609 km (0.083 R)
- M25: 11,958,704 km (0.118 R)
- M26: 12,287,371 km (0.039 R)
- M27: 12,452,976 km (0.094 R)
- M28: 12,786,130 km (0.093 R)
- M29: 13,178,675 km (0.094 R)
- M30: 15,855,430 km (0.085 R)
- M31: 16,035,695 km (0.113 R)
- M32: 16,156,271 km (0.032 R)
- M33: 16,277,146 km (0.117 R)
- M34: 16,398,320 km (0.112 R)
- M35: 17,131,799 km (0.112 R)
- M36: 18,063,644 km (0.112 R)
- M37: 18,252,137 km (0.047 R)
- M38: 20,825,520 km (0.092 R)
- M39: 21,819,597 km (0.094 R)
- M40: 23,032,986 km (0.087 R)
- M41: 23,510,801 km (0.089 R)
- M42: 23,785,313 km (0.051 R)
- M43: 24,337,479 km (0.108 R)
- M44: 26,090,168 km (0.071 R)
- M45: 26,374,404 km (0.1 R)
- M46: 26,659,537 km (0.09 R)
- M47: 27,017,675 km (0.077 R)
- M48: 28,028,507 km (0.069 R)
- M49: 28,173,917 km (0.048 R)
- M50: 29,938,573 km (0.094 R)
- M51: 30,310,773 km (0.08 R)
- M52: 30,984,561 km (0.098 R)
- M53: 31,587,590 km (0.067 R)
- M54: 33,188,886 km (0.065 R)
- M55: 34,504,599 km (0.07 R)
- M56: 34,972,990 km (0.098 R)
- M57: 35,679,541 km (0.064 R)
- M58: 36,153,317 km (0.103 R)
- M59: 36,788,061 km (0.088 R)
- M60: 37,907,951 km (0.056 R)
- M61: 38,552,867 km (0.081 R)
- M62: 39,364,137 km (0.09 R)
- M63: 41,416,918 km (0.076 R)
- M64: 42,498,062 km (0.117 R)
- M65: 44,010,347 km (0.107 R)
- M66: 44,348,738 km (0.107 R)
- M67: 44,518,382 km (0.112 R)
- M68: 46,914,790 km (0.107 R)
- M69: 48,215,693 km (0.112 R)
- M70: 49,528,564 km (0.065 R)
- M71: 49,880,568 km (0.103 R)
- M72: 50,233,619 km (0.097 R)
- M73: 50,498,706 km (0.047 R)
- M74: 52,547,598 km (0.118 R)
- M75: 54,260,644 km (0.038 R)
- M76: 55,808,832 km (0.046 R)
- M77: 56,358,604 km (0.12 R)
- M78: 58,297,393 km (0.111 R)
- M79: 59,134,991 km (0.115 R)
- M80: 60,351,820 km (0.089 R)
- M81: 61,576,877 km (0.117 R)
- M82: 62,715,018 km (0.103 R)
- M83: 63,000,600 km (0.089 R)
- M84: 63,191,337 km (0.094 R)
- M85: 63,286,781 km (0.097 R)
Planet 6 - Gas Giant
Semi-Major Axis: 11.8 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 501.2
Radius: 9.8
Gravity: 5.22 G
Time & Orbit
Eccentricity (e): 0.077
Orbit Range: 10.89 AU - 12.71 AU
Year: 15270 Days
Day: 7.4 Hours
Environment
Temp: -184 °C
Axial Tilt: 5 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (64)
Outer Limit: 75,846,069 km
- M1: 187,745 km (0.057 R)
- M2: 496,067 km (0.113 R)
- M3: 899,682 km (0.116 R)
- M4: 1,319,304 km (0.088 R)
- M5: 2,831,738 km (0.069 R)
- M6: 3,987,382 km (0.072 R)
- M7: 5,661,382 km (0.092 R)
- M8: 6,467,415 km (0.104 R)
- M9: 6,674,459 km (0.094 R)
- M10: 7,395,072 km (0.117 R)
- M11: 7,524,922 km (0.039 R)
- M12: 8,955,527 km (0.105 R)
- M13: 10,130,319 km (0.08 R)
- M14: 10,371,022 km (0.045 R)
- M15: 10,760,276 km (0.077 R)
- M16: 13,299,251 km (0.104 R)
- M17: 13,988,598 km (0.083 R)
- M18: 15,346,498 km (0.102 R)
- M19: 15,512,402 km (0.109 R)
- M20: 16,973,973 km (0.107 R)
- M21: 18,537,869 km (0.069 R)
- M22: 18,714,394 km (0.065 R)
- M23: 19,486,170 km (0.099 R)
- M24: 19,725,826 km (0.049 R)
- M25: 20,450,328 km (0.077 R)
- M26: 21,677,180 km (0.112 R)
- M27: 22,112,211 km (0.089 R)
- M28: 22,801,707 km (0.079 R)
- M29: 23,117,359 km (0.095 R)
- M30: 23,434,506 km (0.062 R)
- M31: 23,881,056 km (0.086 R)
- M32: 24,912,085 km (0.115 R)
- M33: 25,107,011 km (0.062 R)
- M34: 25,498,359 km (0.039 R)
- M35: 25,563,883 km (0.068 R)
- M36: 26,089,270 km (0.088 R)
- M37: 26,884,233 km (0.11 R)
- M38: 27,619,806 km (0.095 R)
- M39: 28,023,870 km (0.092 R)
- M40: 29,316,246 km (0.098 R)
- M41: 29,453,427 km (0.096 R)
- M42: 29,590,758 km (0.094 R)
- M43: 29,728,388 km (0.12 R)
- M44: 31,606,739 km (0.103 R)
- M45: 32,029,353 km (0.1 R)
- M46: 32,524,821 km (0.026 R)
- M47: 33,308,415 km (0.109 R)
- M48: 35,989,657 km (0.101 R)
- M49: 36,800,029 km (0.107 R)
- M50: 38,139,080 km (0.034 R)
- M51: 38,363,776 km (0.119 R)
- M52: 38,589,070 km (0.092 R)
- M53: 41,864,515 km (0.084 R)
- M54: 42,638,834 km (0.109 R)
- M55: 43,339,999 km (0.108 R)
- M56: 45,942,852 km (0.086 R)
- M57: 47,142,627 km (0.105 R)
- M58: 47,383,929 km (0.08 R)
- M59: 48,271,792 km (0.057 R)
- M60: 48,514,889 km (0.077 R)
- M61: 49,982,145 km (0.085 R)
- M62: 51,629,367 km (0.116 R)
- M63: 53,378,166 km (0.114 R)
- M64: 55,994,932 km (0.108 R)
Planet 7 - Ice Giant
Semi-Major Axis: 14.11 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 680.7
Radius: 6.7
Gravity: 15.16 G
Time & Orbit
Eccentricity (e): 0.25
Orbit Range: 10.58 AU - 17.64 AU
Year: 19967 Days
Day: 22.2 Hours
Environment
Temp: -195 °C
Axial Tilt: 17.6 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (97)
Outer Limit: 75,846,069 km
- M1: 251,324 km (0.112 R)
- M2: 297,550 km (0.089 R)
- M3: 382,821 km (0.091 R)
- M4: 758,910 km (0.112 R)
- M5: 1,141,581 km (0.078 R)
- M6: 1,224,758 km (0.063 R)
- M7: 1,338,901 km (0.097 R)
- M8: 2,999,437 km (0.051 R)
- M9: 3,076,630 km (0.086 R)
- M10: 3,193,466 km (0.088 R)
- M11: 3,925,149 km (0.087 R)
- M12: 4,180,213 km (0.104 R)
- M13: 4,573,057 km (0.076 R)
- M14: 5,161,127 km (0.063 R)
- M15: 6,209,957 km (0.097 R)
- M16: 6,707,819 km (0.101 R)
- M17: 7,115,473 km (0.082 R)
- M18: 7,218,546 km (0.025 R)
- M19: 8,169,241 km (0.066 R)
- M20: 8,824,629 km (0.071 R)
- M21: 9,214,780 km (0.097 R)
- M22: 9,667,463 km (0.074 R)
- M23: 9,896,647 km (0.085 R)
- M24: 9,954,242 km (0.1 R)
- M25: 10,243,714 km (0.118 R)
- M26: 10,653,612 km (0.108 R)
- M27: 10,712,554 km (0.109 R)
- M28: 10,830,886 km (0.057 R)
- M29: 11,549,853 km (0.084 R)
- M30: 11,853,986 km (0.072 R)
- M31: 12,160,811 km (0.087 R)
- M32: 13,286,834 km (0.108 R)
- M33: 15,703,737 km (0.082 R)
- M34: 16,858,932 km (0.039 R)
- M35: 17,690,696 km (0.099 R)
- M36: 17,760,558 km (0.057 R)
- M37: 18,041,204 km (0.114 R)
- M38: 18,891,668 km (0.049 R)
- M39: 20,411,433 km (0.1 R)
- M40: 21,297,202 km (0.112 R)
- M41: 22,120,289 km (0.094 R)
- M42: 22,271,084 km (0.075 R)
- M43: 23,335,921 km (0.093 R)
- M44: 23,566,302 km (0.086 R)
- M45: 23,643,345 km (0.118 R)
- M46: 23,797,431 km (0.116 R)
- M47: 23,874,623 km (0.034 R)
- M48: 24,261,932 km (0.11 R)
- M49: 26,229,144 km (0.113 R)
- M50: 26,548,685 km (0.119 R)
- M51: 27,758,334 km (0.112 R)
- M52: 28,903,356 km (0.112 R)
- M53: 29,150,791 km (0.09 R)
- M54: 29,730,632 km (0.104 R)
- M55: 32,687,135 km (0.085 R)
- M56: 34,330,767 km (0.043 R)
- M57: 36,801,675 km (0.072 R)
- M58: 38,058,446 km (0.118 R)
- M59: 38,148,803 km (0.064 R)
- M60: 39,055,815 km (0.074 R)
- M61: 39,969,858 km (0.101 R)
- M62: 40,614,027 km (0.108 R)
- M63: 44,454,653 km (0.08 R)
- M64: 44,930,972 km (0.069 R)
- M65: 45,888,548 km (0.066 R)
- M66: 46,852,856 km (0.082 R)
- M67: 47,726,358 km (0.092 R)
- M68: 50,280,144 km (0.053 R)
- M69: 52,676,552 km (0.053 R)
- M70: 53,180,547 km (0.082 R)
- M71: 54,193,175 km (0.084 R)
- M72: 55,416,736 km (0.106 R)
- M73: 56,443,277 km (0.109 R)
- M74: 57,062,163 km (0.119 R)
- M75: 58,202,847 km (0.102 R)
- M76: 58,932,585 km (0.097 R)
- M77: 59,455,579 km (0.096 R)
- M78: 59,560,447 km (0.097 R)
- M79: 60,295,871 km (0.04 R)
- M80: 60,717,437 km (0.1 R)
- M81: 61,034,136 km (0.092 R)
- M82: 61,245,667 km (0.118 R)
- M83: 61,457,498 km (0.094 R)
- M84: 62,413,428 km (0.112 R)
- M85: 62,626,456 km (0.099 R)
- M86: 63,374,146 km (0.12 R)
- M87: 64,339,950 km (0.042 R)
- M88: 65,310,541 km (0.113 R)
- M89: 66,285,919 km (0.102 R)
- M90: 66,503,285 km (0.065 R)
- M91: 67,922,370 km (0.117 R)
- M92: 72,350,617 km (0.103 R)
- M93: 72,574,415 km (0.114 R)
- M94: 73,247,306 km (0.059 R)
- M95: 73,584,649 km (0.079 R)
- M96: 74,825,564 km (0.101 R)
- M97: 74,938,809 km (0.086 R)
Kuiper Belt
Range: 30 - 45 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 174 - 13,439 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.