Star System Generated (Seed: 1768284131)
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: 0.81 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 79.6
Radius: 10.3
Gravity: 0.75 G
Time & Orbit
Eccentricity (e): 0.143
Orbit Range: 0.69 AU - 0.93 AU
Year: 486 Days
Day: 13.8 Hours
Environment
Temp: -160 °C
Axial Tilt: 23 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (31)
Outer Limit: 78,167,494 km
- M1: 128,355 km (0.05 R)
- M2: 193,131 km (0.116 R)
- M3: 258,505 km (0.082 R)
- M4: 352,453 km (0.084 R)
- M5: 430,094 km (0.034 R)
- M6: 499,358 km (0.104 R)
- M7: 616,493 km (0.092 R)
- M8: 689,347 km (0.048 R)
- M9: 757,264 km (0.07 R)
- M10: 827,875 km (0.109 R)
- M11: 923,916 km (0.074 R)
- M12: 997,070 km (0.064 R)
- M13: 1,127,818 km (0.108 R)
- M14: 1,216,231 km (0.099 R)
- M15: 1,280,857 km (0.097 R)
- M16: 1,366,726 km (0.115 R)
- M17: 1,464,862 km (0.111 R)
- M18: 1,541,008 km (0.051 R)
- M19: 1,639,892 km (0.097 R)
- M20: 1,766,452 km (0.1 R)
- M21: 2,029,894 km (0.119 R)
- M22: 2,107,535 km (0.047 R)
- M23: 2,190,113 km (0.049 R)
- M24: 2,297,973 km (0.104 R)
- M25: 2,370,827 km (0.1 R)
- M26: 2,498,284 km (0.117 R)
- M27: 2,606,892 km (0.085 R)
- M28: 2,772,946 km (0.07 R)
- M29: 2,850,887 km (0.105 R)
- M30: 2,973,407 km (0.063 R)
- M31: 3,053,143 km (0.067 R)
Planet 2 - Gas Giant
Semi-Major Axis: 1.18 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 282.5
Radius: 14.6
Gravity: 1.33 G
Time & Orbit
Eccentricity (e): 0.201
Orbit Range: 0.94 AU - 1.42 AU
Year: 855 Days
Day: 14.1 Hours
Environment
Temp: -173 °C
Axial Tilt: 32.3 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (41)
Outer Limit: 78,167,494 km
- M1: 188,344 km (0.105 R)
- M2: 283,189 km (0.083 R)
- M3: 385,215 km (0.081 R)
- M4: 519,703 km (0.083 R)
- M5: 633,397 km (0.073 R)
- M6: 757,564 km (0.106 R)
- M7: 896,241 km (0.052 R)
- M8: 1,239,867 km (0.085 R)
- M9: 1,384,827 km (0.095 R)
- M10: 1,512,285 km (0.101 R)
- M11: 1,698,833 km (0.103 R)
- M12: 1,804,599 km (0.079 R)
- M13: 1,938,489 km (0.116 R)
- M14: 2,069,238 km (0.039 R)
- M15: 2,298,571 km (0.114 R)
- M16: 2,493,946 km (0.111 R)
- M17: 2,600,909 km (0.085 R)
- M18: 2,695,006 km (0.089 R)
- M19: 2,984,178 km (0.091 R)
- M20: 3,128,690 km (0.114 R)
- M21: 3,299,231 km (0.1 R)
- M22: 3,600,970 km (0.059 R)
- M23: 3,730,821 km (0.112 R)
- M24: 3,829,257 km (0.11 R)
- M25: 4,121,421 km (0.079 R)
- M26: 4,317,544 km (0.083 R)
- M27: 4,412,389 km (0.12 R)
- M28: 4,551,665 km (0.078 R)
- M29: 4,657,131 km (0.105 R)
- M30: 4,790,124 km (0.104 R)
- M31: 4,924,313 km (0.08 R)
- M32: 5,041,747 km (0.117 R)
- M33: 5,187,605 km (0.1 R)
- M34: 5,418,285 km (0.08 R)
- M35: 5,605,283 km (0.118 R)
- M36: 5,765,951 km (0.079 R)
- M37: 5,928,115 km (0.073 R)
- M38: 6,024,306 km (0.109 R)
- M39: 6,189,014 km (0.068 R)
- M40: 6,582,306 km (0.039 R)
- M41: 6,913,217 km (0.051 R)
Planet 3 - Gas Giant
Semi-Major Axis: 1.48 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 136.2
Radius: 11.9
Gravity: 0.96 G
Time & Orbit
Eccentricity (e): 0.112
Orbit Range: 1.31 AU - 1.65 AU
Year: 1201 Days
Day: 12 Hours
Environment
Temp: -199 °C
Axial Tilt: 10.5 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (46)
Outer Limit: 78,167,494 km
- M1: 149,747 km (0.089 R)
- M2: 258,356 km (0.043 R)
- M3: 365,019 km (0.082 R)
- M4: 485,744 km (0.116 R)
- M5: 562,338 km (0.037 R)
- M6: 752,776 km (0.111 R)
- M7: 858,841 km (0.095 R)
- M8: 936,034 km (0.028 R)
- M9: 1,015,770 km (0.095 R)
- M10: 1,092,962 km (0.069 R)
- M11: 1,237,025 km (0.056 R)
- M12: 1,325,587 km (0.107 R)
- M13: 1,468,602 km (0.092 R)
- M14: 1,568,833 km (0.112 R)
- M15: 1,677,591 km (0.109 R)
- M16: 1,770,341 km (0.095 R)
- M17: 1,883,886 km (0.072 R)
- M18: 1,967,511 km (0.103 R)
- M19: 2,151,965 km (0.105 R)
- M20: 2,260,125 km (0.098 R)
- M21: 2,363,048 km (0.092 R)
- M22: 2,453,704 km (0.119 R)
- M23: 2,581,162 km (0.09 R)
- M24: 2,710,863 km (0.047 R)
- M25: 2,961,739 km (0.093 R)
- M26: 3,052,245 km (0.116 R)
- M27: 3,282,476 km (0.097 R)
- M28: 3,470,820 km (0.038 R)
- M29: 3,776,449 km (0.118 R)
- M30: 3,891,340 km (0.089 R)
- M31: 4,024,033 km (0.08 R)
- M32: 4,192,032 km (0.077 R)
- M33: 4,302,435 km (0.099 R)
- M34: 4,491,676 km (0.117 R)
- M35: 4,604,772 km (0.119 R)
- M36: 5,003,750 km (0.1 R)
- M37: 5,239,516 km (0.094 R)
- M38: 5,349,470 km (0.118 R)
- M39: 5,441,772 km (0.073 R)
- M40: 5,787,792 km (0.059 R)
- M41: 5,920,635 km (0.089 R)
- M42: 6,131,568 km (0.119 R)
- M43: 6,257,230 km (0.039 R)
- M44: 6,501,523 km (0.116 R)
- M45: 6,659,648 km (0.071 R)
- M46: 6,749,108 km (0.115 R)
Planet 4 - Gas Giant
Semi-Major Axis: 2.1 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 778.2
Radius: 11.5
Gravity: 5.88 G
Time & Orbit
Eccentricity (e): 0.198
Orbit Range: 1.68 AU - 2.52 AU
Year: 2029 Days
Day: 12.8 Hours
Environment
Temp: -198 °C
Axial Tilt: 10.7 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (63)
Outer Limit: 78,167,494 km
- M1: 160,219 km (0.047 R)
- M2: 260,001 km (0.097 R)
- M3: 352,004 km (0.087 R)
- M4: 433,385 km (0.04 R)
- M5: 701,016 km (0.097 R)
- M6: 802,293 km (0.12 R)
- M7: 1,040,304 km (0.076 R)
- M8: 1,375,552 km (0.086 R)
- M9: 1,506,002 km (0.112 R)
- M10: 1,732,942 km (0.064 R)
- M11: 1,826,889 km (0.071 R)
- M12: 1,946,867 km (0.083 R)
- M13: 2,044,704 km (0.082 R)
- M14: 2,119,353 km (0.097 R)
- M15: 2,559,470 km (0.06 R)
- M16: 2,887,538 km (0.081 R)
- M17: 3,099,518 km (0.082 R)
- M18: 3,185,687 km (0.082 R)
- M19: 3,301,924 km (0.057 R)
- M20: 3,390,187 km (0.112 R)
- M21: 3,494,008 km (0.074 R)
- M22: 3,982,445 km (0.05 R)
- M23: 4,107,958 km (0.115 R)
- M24: 4,187,095 km (0.12 R)
- M25: 4,623,322 km (0.087 R)
- M26: 5,091,264 km (0.076 R)
- M27: 5,193,440 km (0.051 R)
- M28: 5,452,244 km (0.11 R)
- M29: 5,768,195 km (0.088 R)
- M30: 5,964,318 km (0.091 R)
- M31: 6,547,450 km (0.084 R)
- M32: 6,808,349 km (0.086 R)
- M33: 6,958,994 km (0.108 R)
- M34: 7,301,872 km (0.084 R)
- M35: 8,203,498 km (0.102 R)
- M36: 8,464,696 km (0.086 R)
- M37: 8,871,902 km (0.086 R)
- M38: 9,077,898 km (0.058 R)
- M39: 9,431,847 km (0.117 R)
- M40: 9,536,864 km (0.038 R)
- M41: 9,663,274 km (0.092 R)
- M42: 10,153,207 km (0.056 R)
- M43: 10,368,778 km (0.099 R)
- M44: 10,520,620 km (0.053 R)
- M45: 10,629,527 km (0.117 R)
- M46: 10,980,484 km (0.113 R)
- M47: 11,068,896 km (0.063 R)
- M48: 11,469,370 km (0.05 R)
- M49: 12,193,124 km (0.117 R)
- M50: 12,768,926 km (0.117 R)
- M51: 12,955,026 km (0.083 R)
- M52: 13,118,686 km (0.044 R)
- M53: 13,212,484 km (0.114 R)
- M54: 13,306,581 km (0.108 R)
- M55: 14,066,688 km (0.077 R)
- M56: 14,452,201 km (0.107 R)
- M57: 14,694,849 km (0.092 R)
- M58: 15,061,364 km (0.103 R)
- M59: 15,678,904 km (0.112 R)
- M60: 15,753,703 km (0.028 R)
- M61: 15,853,335 km (0.097 R)
- M62: 16,355,236 km (0.074 R)
- M63: 16,989,980 km (0.032 R)
Planet 5 - Gas Giant
Semi-Major Axis: 2.68 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 176.2
Radius: 9.6
Gravity: 1.91 G
Time & Orbit
Eccentricity (e): 0.15
Orbit Range: 2.28 AU - 3.08 AU
Year: 2926 Days
Day: 8.4 Hours
Environment
Temp: -199 °C
Axial Tilt: 24.3 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (71)
Outer Limit: 78,167,494 km
- M1: 128,953 km (0.115 R)
- M2: 199,264 km (0.084 R)
- M3: 310,266 km (0.057 R)
- M4: 382,073 km (0.099 R)
- M5: 472,879 km (0.1 R)
- M6: 540,497 km (0.025 R)
- M7: 625,170 km (0.069 R)
- M8: 801,994 km (0.025 R)
- M9: 924,066 km (0.117 R)
- M10: 1,110,914 km (0.084 R)
- M11: 1,265,897 km (0.088 R)
- M12: 1,391,559 km (0.106 R)
- M13: 1,540,409 km (0.115 R)
- M14: 1,704,518 km (0.056 R)
- M15: 2,188,018 km (0.064 R)
- M16: 2,285,407 km (0.073 R)
- M17: 2,373,221 km (0.113 R)
- M18: 2,462,231 km (0.069 R)
- M19: 2,620,655 km (0.05 R)
- M20: 2,759,183 km (0.088 R)
- M21: 3,019,483 km (0.11 R)
- M22: 3,091,889 km (0.092 R)
- M23: 3,164,893 km (0.098 R)
- M24: 3,412,477 km (0.071 R)
- M25: 3,979,154 km (0.113 R)
- M26: 4,098,682 km (0.112 R)
- M27: 4,314,253 km (0.086 R)
- M28: 4,714,577 km (0.03 R)
- M29: 4,798,800 km (0.117 R)
- M30: 4,869,411 km (0.105 R)
- M31: 5,170,102 km (0.073 R)
- M32: 5,344,534 km (0.09 R)
- M33: 5,447,158 km (0.09 R)
- M34: 5,535,720 km (0.072 R)
- M35: 5,684,420 km (0.065 R)
- M36: 6,000,969 km (0.075 R)
- M37: 6,276,827 km (0.1 R)
- M38: 6,338,761 km (0.094 R)
- M39: 6,682,686 km (0.101 R)
- M40: 7,210,169 km (0.09 R)
- M41: 7,291,400 km (0.101 R)
- M42: 7,503,680 km (0.057 R)
- M43: 7,701,448 km (0.057 R)
- M44: 7,900,862 km (0.059 R)
- M45: 8,135,880 km (0.042 R)
- M46: 8,237,308 km (0.065 R)
- M47: 8,526,929 km (0.111 R)
- M48: 8,698,817 km (0.027 R)
- M49: 8,785,135 km (0.066 R)
- M50: 9,291,973 km (0.042 R)
- M51: 9,468,947 km (0.038 R)
- M52: 9,593,412 km (0.09 R)
- M53: 9,790,283 km (0.1 R)
- M54: 10,060,906 km (0.117 R)
- M55: 10,187,914 km (0.116 R)
- M56: 10,590,931 km (0.108 R)
- M57: 10,683,233 km (0.117 R)
- M58: 10,961,784 km (0.068 R)
- M59: 11,055,133 km (0.108 R)
- M60: 11,130,082 km (0.103 R)
- M61: 11,299,277 km (0.055 R)
- M62: 11,564,065 km (0.084 R)
- M63: 11,716,356 km (0.103 R)
- M64: 11,830,948 km (0.09 R)
- M65: 12,215,713 km (0.052 R)
- M66: 12,448,637 km (0.085 R)
- M67: 12,526,578 km (0.082 R)
- M68: 12,702,505 km (0.081 R)
- M69: 12,997,661 km (0.049 R)
- M70: 13,314,958 km (0.025 R)
- M71: 13,434,637 km (0.093 R)
Planet 6 - Gas Giant
Semi-Major Axis: 5.08 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 162.8
Radius: 14.6
Gravity: 0.76 G
Time & Orbit
Eccentricity (e): 0.229
Orbit Range: 3.92 AU - 6.24 AU
Year: 7635 Days
Day: 6.8 Hours
Environment
Temp: -226 °C
Axial Tilt: 18.4 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (72)
Outer Limit: 78,167,494 km
- M1: 278,850 km (0.115 R)
- M2: 385,963 km (0.094 R)
- M3: 552,465 km (0.118 R)
- M4: 677,230 km (0.077 R)
- M5: 879,935 km (0.053 R)
- M6: 1,019,360 km (0.089 R)
- M7: 1,141,731 km (0.103 R)
- M8: 1,243,757 km (0.108 R)
- M9: 1,569,282 km (0.042 R)
- M10: 1,877,004 km (0.058 R)
- M11: 2,739,586 km (0.11 R)
- M12: 2,932,866 km (0.109 R)
- M13: 3,058,379 km (0.043 R)
- M14: 3,277,689 km (0.084 R)
- M15: 3,464,537 km (0.112 R)
- M16: 3,712,870 km (0.092 R)
- M17: 5,019,757 km (0.092 R)
- M18: 5,301,599 km (0.104 R)
- M19: 5,455,535 km (0.105 R)
- M20: 5,700,427 km (0.078 R)
- M21: 5,813,074 km (0.114 R)
- M22: 5,994,686 km (0.119 R)
- M23: 6,201,281 km (0.097 R)
- M24: 6,410,418 km (0.117 R)
- M25: 6,645,437 km (0.068 R)
- M26: 7,075,680 km (0.093 R)
- M27: 7,245,474 km (0.119 R)
- M28: 7,367,695 km (0.055 R)
- M29: 7,788,065 km (0.075 R)
- M30: 8,267,377 km (0.065 R)
- M31: 8,523,488 km (0.08 R)
- M32: 8,782,293 km (0.095 R)
- M33: 9,175,436 km (0.11 R)
- M34: 9,414,044 km (0.053 R)
- M35: 9,601,042 km (0.117 R)
- M36: 10,499,527 km (0.076 R)
- M37: 10,888,930 km (0.104 R)
- M38: 11,029,103 km (0.066 R)
- M39: 11,169,875 km (0.101 R)
- M40: 11,282,971 km (0.111 R)
- M41: 11,453,363 km (0.102 R)
- M42: 11,567,356 km (0.051 R)
- M43: 12,056,392 km (0.083 R)
- M44: 12,405,553 km (0.106 R)
- M45: 12,758,155 km (0.053 R)
- M46: 12,935,728 km (0.111 R)
- M47: 13,233,577 km (0.119 R)
- M48: 13,353,256 km (0.031 R)
- M49: 14,477,932 km (0.115 R)
- M50: 14,632,317 km (0.1 R)
- M51: 14,849,384 km (0.072 R)
- M52: 15,067,348 km (0.112 R)
- M53: 16,141,760 km (0.108 R)
- M54: 16,526,825 km (0.108 R)
- M55: 16,914,882 km (0.081 R)
- M56: 17,306,080 km (0.111 R)
- M57: 17,535,713 km (0.103 R)
- M58: 17,931,549 km (0.081 R)
- M59: 18,031,031 km (0.111 R)
- M60: 18,230,445 km (0.06 R)
- M61: 18,363,737 km (0.077 R)
- M62: 18,732,197 km (0.034 R)
- M63: 18,967,963 km (0.103 R)
- M64: 19,272,544 km (0.119 R)
- M65: 19,817,978 km (0.079 R)
- M66: 20,715,116 km (0.08 R)
- M67: 21,203,703 km (0.058 R)
- M68: 22,121,187 km (0.112 R)
- M69: 22,764,009 km (0.093 R)
- M70: 22,979,729 km (0.086 R)
- M71: 23,087,739 km (0.048 R)
- M72: 23,958,548 km (0.087 R)
Planet 7 - Ice Giant
Semi-Major Axis: 9.9 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 688.5
Radius: 6.1
Gravity: 18.5 G
Time & Orbit
Eccentricity (e): 0.156
Orbit Range: 8.36 AU - 11.44 AU
Year: 20772 Days
Day: 24.3 Hours
Environment
Temp: -228 °C
Axial Tilt: 46.7 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (92)
Outer Limit: 78,167,494 km
- M1: 95,593 km (0.05 R)
- M2: 248,931 km (0.113 R)
- M3: 587,172 km (0.088 R)
- M4: 677,379 km (0.078 R)
- M5: 747,989 km (0.102 R)
- M6: 1,001,857 km (0.109 R)
- M7: 1,083,089 km (0.064 R)
- M8: 2,398,652 km (0.119 R)
- M9: 2,582,508 km (0.1 R)
- M10: 3,527,069 km (0.101 R)
- M11: 4,343,125 km (0.098 R)
- M12: 6,645,736 km (0.099 R)
- M13: 7,324,162 km (0.077 R)
- M14: 7,590,895 km (0.066 R)
- M15: 7,752,610 km (0.087 R)
- M16: 8,689,692 km (0.066 R)
- M17: 8,745,940 km (0.078 R)
- M18: 9,430,201 km (0.081 R)
- M19: 9,487,946 km (0.119 R)
- M20: 9,545,990 km (0.069 R)
- M21: 11,770,211 km (0.092 R)
- M22: 12,397,774 km (0.055 R)
- M23: 13,359,389 km (0.062 R)
- M24: 13,619,839 km (0.045 R)
- M25: 13,816,261 km (0.113 R)
- M26: 14,678,393 km (0.116 R)
- M27: 17,937,084 km (0.112 R)
- M28: 19,609,887 km (0.098 R)
- M29: 19,757,690 km (0.044 R)
- M30: 20,352,491 km (0.043 R)
- M31: 20,577,038 km (0.096 R)
- M32: 21,331,759 km (0.087 R)
- M33: 21,407,605 km (0.12 R)
- M34: 23,257,532 km (0.041 R)
- M35: 23,492,401 km (0.094 R)
- M36: 25,238,208 km (0.074 R)
- M37: 27,602,602 km (0.1 R)
- M38: 27,768,357 km (0.075 R)
- M39: 28,267,266 km (0.09 R)
- M40: 29,696,973 km (0.097 R)
- M41: 30,634,652 km (0.114 R)
- M42: 30,977,979 km (0.111 R)
- M43: 32,889,092 km (0.107 R)
- M44: 33,328,760 km (0.084 R)
- M45: 35,106,731 km (0.074 R)
- M46: 36,188,323 km (0.04 R)
- M47: 37,555,498 km (0.102 R)
- M48: 40,716,501 km (0.08 R)
- M49: 41,093,937 km (0.086 R)
- M50: 41,757,403 km (0.083 R)
- M51: 42,806,982 km (0.093 R)
- M52: 42,902,725 km (0.11 R)
- M53: 43,286,892 km (0.101 R)
- M54: 43,383,083 km (0.025 R)
- M55: 44,737,393 km (0.105 R)
- M56: 45,419,709 km (0.03 R)
- M57: 47,586,484 km (0.107 R)
- M58: 47,785,150 km (0.111 R)
- M59: 48,183,380 km (0.036 R)
- M60: 49,988,428 km (0.027 R)
- M61: 50,190,385 km (0.101 R)
- M62: 51,000,906 km (0.088 R)
- M63: 51,407,812 km (0.097 R)
- M64: 51,713,590 km (0.079 R)
- M65: 55,326,229 km (0.1 R)
- M66: 55,430,649 km (0.086 R)
- M67: 56,793,934 km (0.056 R)
- M68: 57,850,095 km (0.089 R)
- M69: 58,912,838 km (0.096 R)
- M70: 59,660,528 km (0.063 R)
- M71: 60,089,126 km (0.119 R)
- M72: 60,626,482 km (0.118 R)
- M73: 60,841,753 km (0.065 R)
- M74: 61,381,203 km (0.098 R)
- M75: 63,664,515 km (0.088 R)
- M76: 63,883,377 km (0.107 R)
- M77: 63,992,883 km (0.065 R)
- M78: 66,307,611 km (0.08 R)
- M79: 66,640,615 km (0.036 R)
- M80: 68,761,913 km (0.075 R)
- M81: 69,549,097 km (0.104 R)
- M82: 69,661,744 km (0.08 R)
- M83: 70,000,135 km (0.061 R)
- M84: 70,905,352 km (0.109 R)
- M85: 71,245,687 km (0.1 R)
- M86: 72,270,283 km (0.111 R)
- M87: 73,070,631 km (0.107 R)
- M88: 73,414,407 km (0.143 R)
- M89: 74,910,685 km (0.081 R)
- M90: 76,999,071 km (0.115 R)
- M91: 77,348,981 km (0.046 R)
- M92: 77,465,667 km (0.094 R)
Kuiper Belt
Range: 30 - 48 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 467 - 13,970 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.