Star System Generated (Seed: 1768304644)
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: 632.8
Radius: 8.9
Gravity: 7.99 G
Time & Orbit
Eccentricity (e): 0.068
Orbit Range: 0.75 AU - 0.87 AU
Year: 486 Days
Day: 6.8 Hours
Environment
Temp: -167 °C
Axial Tilt: 29 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (51)
Outer Limit: 82,381,831 km
- M1: 114,293 km (0.118 R)
- M2: 219,011 km (0.097 R)
- M3: 306,676 km (0.11 R)
- M4: 371,003 km (0.112 R)
- M5: 501,602 km (0.089 R)
- M6: 569,369 km (0.073 R)
- M7: 652,845 km (0.082 R)
- M8: 797,656 km (0.038 R)
- M9: 906,413 km (0.09 R)
- M10: 962,812 km (0.073 R)
- M11: 1,049,728 km (0.116 R)
- M12: 1,149,510 km (0.071 R)
- M13: 1,216,231 km (0.114 R)
- M14: 1,294,919 km (0.118 R)
- M15: 1,369,868 km (0.086 R)
- M16: 1,435,392 km (0.034 R)
- M17: 1,507,647 km (0.094 R)
- M18: 1,673,252 km (0.075 R)
- M19: 1,814,772 km (0.042 R)
- M20: 1,942,080 km (0.076 R)
- M21: 2,009,997 km (0.112 R)
- M22: 2,084,946 km (0.075 R)
- M23: 2,224,820 km (0.118 R)
- M24: 2,480,632 km (0.065 R)
- M25: 2,540,920 km (0.06 R)
- M26: 2,690,667 km (0.028 R)
- M27: 2,857,469 km (0.088 R)
- M28: 2,991,808 km (0.061 R)
- M29: 3,179,254 km (0.108 R)
- M30: 3,237,747 km (0.117 R)
- M31: 3,318,679 km (0.095 R)
- M32: 3,378,070 km (0.113 R)
- M33: 3,437,609 km (0.114 R)
- M34: 3,520,337 km (0.106 R)
- M35: 3,626,402 km (0.103 R)
- M36: 3,756,851 km (0.069 R)
- M37: 3,888,797 km (0.105 R)
- M38: 4,125,311 km (0.03 R)
- M39: 4,181,260 km (0.064 R)
- M40: 4,366,612 km (0.114 R)
- M41: 4,521,895 km (0.118 R)
- M42: 4,596,095 km (0.102 R)
- M43: 4,653,990 km (0.112 R)
- M44: 5,109,665 km (0.1 R)
- M45: 5,282,002 km (0.116 R)
- M46: 5,360,092 km (0.106 R)
- M47: 5,429,954 km (0.104 R)
- M48: 5,500,115 km (0.077 R)
- M49: 5,632,509 km (0.051 R)
- M50: 5,712,395 km (0.055 R)
- M51: 6,099,404 km (0.1 R)
Planet 2 - Gas Giant
Semi-Major Axis: 0.88 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 765.7
Radius: 10.2
Gravity: 7.36 G
Time & Orbit
Eccentricity (e): 0.096
Orbit Range: 0.8 AU - 0.96 AU
Year: 550 Days
Day: 14.8 Hours
Environment
Temp: -178 °C
Axial Tilt: 34.1 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (45)
Outer Limit: 82,381,831 km
- M1: 127,457 km (0.113 R)
- M2: 269,276 km (0.097 R)
- M3: 377,884 km (0.116 R)
- M4: 462,108 km (0.086 R)
- M5: 554,260 km (0.046 R)
- M6: 694,134 km (0.078 R)
- M7: 797,656 km (0.077 R)
- M8: 881,580 km (0.103 R)
- M9: 1,042,847 km (0.08 R)
- M10: 1,135,597 km (0.046 R)
- M11: 1,237,025 km (0.096 R)
- M12: 1,300,454 km (0.117 R)
- M13: 1,547,440 km (0.073 R)
- M14: 1,616,405 km (0.109 R)
- M15: 1,744,311 km (0.047 R)
- M16: 1,990,250 km (0.058 R)
- M17: 2,100,055 km (0.068 R)
- M18: 2,233,197 km (0.119 R)
- M19: 2,304,555 km (0.089 R)
- M20: 2,442,036 km (0.109 R)
- M21: 2,559,919 km (0.087 R)
- M22: 2,702,486 km (0.082 R)
- M23: 3,074,535 km (0.075 R)
- M24: 3,146,193 km (0.115 R)
- M25: 3,234,456 km (0.048 R)
- M26: 3,356,228 km (0.093 R)
- M27: 3,438,208 km (0.079 R)
- M28: 3,537,541 km (0.087 R)
- M29: 3,629,544 km (0.063 R)
- M30: 3,867,105 km (0.115 R)
- M31: 3,970,477 km (0.088 R)
- M32: 4,268,626 km (0.111 R)
- M33: 4,637,833 km (0.069 R)
- M34: 4,757,063 km (0.078 R)
- M35: 4,840,090 km (0.07 R)
- M36: 5,064,337 km (0.09 R)
- M37: 5,272,727 km (0.098 R)
- M38: 5,474,384 km (0.111 R)
- M39: 5,855,709 km (0.09 R)
- M40: 5,974,789 km (0.107 R)
- M41: 6,265,907 km (0.103 R)
- M42: 6,357,162 km (0.096 R)
- M43: 6,695,701 km (0.102 R)
- M44: 6,778,728 km (0.081 R)
- M45: 6,862,054 km (0.088 R)
Planet 3 - Gas Giant
Semi-Major Axis: 1.04 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 444.9
Radius: 9.3
Gravity: 5.14 G
Time & Orbit
Eccentricity (e): 0.203
Orbit Range: 0.83 AU - 1.25 AU
Year: 707 Days
Day: 13.9 Hours
Environment
Temp: -184 °C
Axial Tilt: 48.4 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (54)
Outer Limit: 82,381,831 km
- M1: 132,544 km (0.118 R)
- M2: 226,042 km (0.092 R)
- M3: 353,201 km (0.093 R)
- M4: 420,520 km (0.072 R)
- M5: 489,335 km (0.096 R)
- M6: 587,920 km (0.086 R)
- M7: 680,371 km (0.08 R)
- M8: 778,208 km (0.077 R)
- M9: 846,126 km (0.061 R)
- M10: 941,868 km (0.08 R)
- M11: 1,041,500 km (0.039 R)
- M12: 1,100,891 km (0.104 R)
- M13: 1,451,548 km (0.112 R)
- M14: 1,524,701 km (0.1 R)
- M15: 1,636,750 km (0.065 R)
- M16: 1,719,328 km (0.044 R)
- M17: 1,836,164 km (0.114 R)
- M18: 2,002,966 km (0.074 R)
- M19: 2,064,301 km (0.052 R)
- M20: 2,153,910 km (0.064 R)
- M21: 2,251,897 km (0.116 R)
- M22: 2,329,987 km (0.109 R)
- M23: 2,636,812 km (0.08 R)
- M24: 2,734,350 km (0.086 R)
- M25: 2,825,455 km (0.085 R)
- M26: 2,971,911 km (0.117 R)
- M27: 3,097,274 km (0.113 R)
- M28: 3,256,446 km (0.114 R)
- M29: 3,418,311 km (0.083 R)
- M30: 3,492,063 km (0.096 R)
- M31: 3,566,264 km (0.077 R)
- M32: 3,641,063 km (0.044 R)
- M33: 3,979,902 km (0.071 R)
- M34: 4,074,896 km (0.099 R)
- M35: 4,320,087 km (0.078 R)
- M36: 4,435,577 km (0.045 R)
- M37: 4,552,114 km (0.073 R)
- M38: 4,615,394 km (0.079 R)
- M39: 4,724,450 km (0.12 R)
- M40: 4,806,729 km (0.077 R)
- M41: 4,871,056 km (0.071 R)
- M42: 4,972,783 km (0.029 R)
- M43: 5,065,982 km (0.115 R)
- M44: 5,140,781 km (0.115 R)
- M45: 5,235,028 km (0.061 R)
- M46: 5,358,297 km (0.099 R)
- M47: 5,425,017 km (0.061 R)
- M48: 6,028,645 km (0.089 R)
- M49: 6,108,231 km (0.104 R)
- M50: 6,348,634 km (0.077 R)
- M51: 6,510,649 km (0.115 R)
- M52: 6,818,372 km (0.078 R)
- M53: 6,942,688 km (0.056 R)
- M54: 7,099,167 km (0.102 R)
Planet 4 - Gas Giant
Semi-Major Axis: 1.13 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 47
Radius: 9.1
Gravity: 0.57 G
Time & Orbit
Eccentricity (e): 0.064
Orbit Range: 1.06 AU - 1.2 AU
Year: 801 Days
Day: 6 Hours
Environment
Temp: -172 °C
Axial Tilt: 27.9 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (37)
Outer Limit: 82,381,831 km
- M1: 113,246 km (0.087 R)
- M2: 177,273 km (0.107 R)
- M3: 240,254 km (0.09 R)
- M4: 308,321 km (0.109 R)
- M5: 415,134 km (0.085 R)
- M6: 492,775 km (0.089 R)
- M7: 587,022 km (0.077 R)
- M8: 650,751 km (0.113 R)
- M9: 720,015 km (0.117 R)
- M10: 841,638 km (0.12 R)
- M11: 898,784 km (0.076 R)
- M12: 970,441 km (0.087 R)
- M13: 1,044,193 km (0.072 R)
- M14: 1,158,486 km (0.071 R)
- M15: 1,229,844 km (0.117 R)
- M16: 1,288,187 km (0.038 R)
- M17: 1,403,826 km (0.114 R)
- M18: 1,468,752 km (0.044 R)
- M19: 1,550,432 km (0.079 R)
- M20: 1,698,085 km (0.079 R)
- M21: 1,755,232 km (0.113 R)
- M22: 1,973,346 km (0.097 R)
- M23: 2,059,514 km (0.071 R)
- M24: 2,155,855 km (0.106 R)
- M25: 2,231,402 km (0.065 R)
- M26: 2,294,233 km (0.05 R)
- M27: 2,353,175 km (0.12 R)
- M28: 2,598,814 km (0.11 R)
- M29: 2,688,872 km (0.112 R)
- M30: 2,756,042 km (0.056 R)
- M31: 2,828,447 km (0.096 R)
- M32: 3,069,748 km (0.118 R)
- M33: 3,155,019 km (0.062 R)
- M34: 3,241,187 km (0.041 R)
- M35: 3,312,695 km (0.056 R)
- M36: 3,384,801 km (0.089 R)
- M37: 3,561,925 km (0.12 R)
Planet 5 - Gas Giant
Semi-Major Axis: 1.81 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 80
Radius: 14.8
Gravity: 0.37 G
Time & Orbit
Eccentricity (e): 0.203
Orbit Range: 1.44 AU - 2.18 AU
Year: 1624 Days
Day: 11 Hours
Environment
Temp: -197 °C
Axial Tilt: 25.6 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (44)
Outer Limit: 82,381,831 km
- M1: 187,147 km (0.03 R)
- M2: 323,580 km (0.11 R)
- M3: 418,425 km (0.076 R)
- M4: 622,626 km (0.112 R)
- M5: 728,691 km (0.06 R)
- M6: 884,722 km (0.07 R)
- M7: 992,283 km (0.106 R)
- M8: 1,105,079 km (0.111 R)
- M9: 1,206,208 km (0.069 R)
- M10: 1,333,366 km (0.102 R)
- M11: 1,471,145 km (0.092 R)
- M12: 1,583,942 km (0.073 R)
- M13: 1,718,281 km (0.109 R)
- M14: 1,818,661 km (0.098 R)
- M15: 1,979,629 km (0.107 R)
- M16: 2,071,931 km (0.097 R)
- M17: 2,274,785 km (0.06 R)
- M18: 2,781,623 km (0.118 R)
- M19: 2,893,223 km (0.081 R)
- M20: 3,052,245 km (0.068 R)
- M21: 3,144,398 km (0.042 R)
- M22: 3,245,376 km (0.115 R)
- M23: 3,371,188 km (0.102 R)
- M24: 3,563,122 km (0.102 R)
- M25: 3,799,786 km (0.115 R)
- M26: 3,916,023 km (0.117 R)
- M27: 4,109,454 km (0.093 R)
- M28: 4,203,251 km (0.084 R)
- M29: 4,340,732 km (0.098 R)
- M30: 4,436,325 km (0.108 R)
- M31: 4,541,193 km (0.118 R)
- M32: 4,673,737 km (0.081 R)
- M33: 4,780,550 km (0.088 R)
- M34: 4,978,767 km (0.094 R)
- M35: 5,106,224 km (0.076 R)
- M36: 5,336,754 km (0.093 R)
- M37: 5,495,478 km (0.045 R)
- M38: 5,617,998 km (0.107 R)
- M39: 5,731,842 km (0.107 R)
- M40: 5,971,498 km (0.076 R)
- M41: 6,116,907 km (0.084 R)
- M42: 6,460,982 km (0.085 R)
- M43: 6,781,122 km (0.096 R)
- M44: 6,963,482 km (0.079 R)
Planet 6 - Ice Giant
Semi-Major Axis: 8.86 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 583.2
Radius: 3.2
Gravity: 56.95 G
Time & Orbit
Eccentricity (e): 0.141
Orbit Range: 7.61 AU - 10.11 AU
Year: 17587 Days
Day: 23.8 Hours
Environment
Temp: -227 °C
Axial Tilt: 8.7 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (92)
Outer Limit: 82,381,831 km
- M1: 105,915 km (0.073 R)
- M2: 137,780 km (0.12 R)
- M3: 161,267 km (0.073 R)
- M4: 436,377 km (0.042 R)
- M5: 472,879 km (0.101 R)
- M6: 549,323 km (0.112 R)
- M7: 629,657 km (0.114 R)
- M8: 650,302 km (0.1 R)
- M9: 735,423 km (0.115 R)
- M10: 869,912 km (0.114 R)
- M11: 1,915,900 km (0.115 R)
- M12: 2,194,750 km (0.08 R)
- M13: 2,486,167 km (0.054 R)
- M14: 3,844,366 km (0.09 R)
- M15: 4,194,276 km (0.089 R)
- M16: 4,393,091 km (0.101 R)
- M17: 4,433,183 km (0.058 R)
- M18: 4,554,358 km (0.11 R)
- M19: 5,389,114 km (0.056 R)
- M20: 5,475,132 km (0.062 R)
- M21: 5,518,366 km (0.099 R)
- M22: 5,561,600 km (0.12 R)
- M23: 5,867,976 km (0.067 R)
- M24: 6,090,129 km (0.079 R)
- M25: 7,194,162 km (0.078 R)
- M26: 8,012,761 km (0.113 R)
- M27: 9,475,529 km (0.114 R)
- M28: 9,527,440 km (0.112 R)
- M29: 9,893,356 km (0.117 R)
- M30: 10,263,910 km (0.088 R)
- M31: 10,692,807 km (0.052 R)
- M32: 10,746,812 km (0.038 R)
- M33: 10,963,878 km (0.115 R)
- M34: 11,018,332 km (0.103 R)
- M35: 13,386,466 km (0.099 R)
- M36: 14,328,334 km (0.045 R)
- M37: 15,291,446 km (0.113 R)
- M38: 15,535,440 km (0.09 R)
- M39: 16,089,251 km (0.111 R)
- M40: 16,337,434 km (0.091 R)
- M41: 16,900,371 km (0.118 R)
- M42: 17,469,740 km (0.036 R)
- M43: 17,597,198 km (0.06 R)
- M44: 17,917,038 km (0.094 R)
- M45: 19,346,745 km (0.054 R)
- M46: 19,478,540 km (0.115 R)
- M47: 19,544,513 km (0.026 R)
- M48: 19,610,635 km (0.103 R)
- M49: 19,942,144 km (0.112 R)
- M50: 20,947,741 km (0.083 R)
- M51: 22,107,274 km (0.08 R)
- M52: 22,660,038 km (0.062 R)
- M53: 23,920,400 km (0.101 R)
- M54: 24,132,680 km (0.07 R)
- M55: 24,416,766 km (0.082 R)
- M56: 27,835,526 km (0.105 R)
- M57: 28,732,216 km (0.113 R)
- M58: 30,937,737 km (0.083 R)
- M59: 31,091,823 km (0.086 R)
- M60: 31,400,743 km (0.063 R)
- M61: 32,803,671 km (0.054 R)
- M62: 36,643,400 km (0.089 R)
- M63: 37,379,122 km (0.112 R)
- M64: 38,367,366 km (0.043 R)
- M65: 39,364,286 km (0.119 R)
- M66: 42,320,340 km (0.09 R)
- M67: 43,005,947 km (0.111 R)
- M68: 43,954,697 km (0.113 R)
- M69: 44,561,915 km (0.093 R)
- M70: 44,997,544 km (0.107 R)
- M71: 45,172,124 km (0.1 R)
- M72: 45,521,884 km (0.068 R)
- M73: 46,400,472 km (0.086 R)
- M74: 46,930,348 km (0.078 R)
- M75: 47,462,168 km (0.087 R)
- M76: 48,442,334 km (0.094 R)
- M77: 48,621,402 km (0.105 R)
- M78: 49,970,326 km (0.102 R)
- M79: 50,241,697 km (0.109 R)
- M80: 50,785,635 km (0.063 R)
- M81: 50,967,396 km (0.099 R)
- M82: 51,879,644 km (0.105 R)
- M83: 53,627,396 km (0.065 R)
- M84: 55,956,485 km (0.057 R)
- M85: 58,794,506 km (0.098 R)
- M86: 58,985,393 km (0.081 R)
- M87: 59,367,765 km (0.119 R)
- M88: 61,775,992 km (0.111 R)
- M89: 63,138,529 km (0.073 R)
- M90: 63,529,578 km (0.116 R)
- M91: 64,904,831 km (0.063 R)
- M92: 65,299,471 km (0.073 R)
Planet 7 - Ice Giant
Semi-Major Axis: 9.54 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 900.7
Radius: 4.5
Gravity: 44.48 G
Time & Orbit
Eccentricity (e): 0.12
Orbit Range: 8.4 AU - 10.68 AU
Year: 19650 Days
Day: 19.8 Hours
Environment
Temp: -230 °C
Axial Tilt: 38.7 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (95)
Outer Limit: 82,381,831 km
- M1: 114,891 km (0.075 R)
- M2: 178,021 km (0.07 R)
- M3: 238,459 km (0.095 R)
- M4: 421,268 km (0.055 R)
- M5: 549,473 km (0.067 R)
- M6: 594,951 km (0.065 R)
- M7: 690,095 km (0.099 R)
- M8: 739,462 km (0.1 R)
- M9: 948,899 km (0.11 R)
- M10: 1,265,897 km (0.116 R)
- M11: 1,746,854 km (0.113 R)
- M12: 2,024,508 km (0.116 R)
- M13: 2,428,572 km (0.104 R)
- M14: 2,543,014 km (0.069 R)
- M15: 3,059,426 km (0.079 R)
- M16: 3,224,732 km (0.091 R)
- M17: 4,230,628 km (0.095 R)
- M18: 4,743,300 km (0.084 R)
- M19: 4,790,872 km (0.107 R)
- M20: 5,324,787 km (0.037 R)
- M21: 5,573,717 km (0.09 R)
- M22: 8,091,898 km (0.117 R)
- M23: 8,551,164 km (0.109 R)
- M24: 9,077,748 km (0.086 R)
- M25: 9,614,655 km (0.108 R)
- M26: 9,978,477 km (0.061 R)
- M27: 10,656,904 km (0.099 R)
- M28: 11,734,607 km (0.082 R)
- M29: 11,798,934 km (0.113 R)
- M30: 11,863,560 km (0.118 R)
- M31: 12,058,037 km (0.092 R)
- M32: 13,112,852 km (0.115 R)
- M33: 13,448,400 km (0.055 R)
- M34: 14,610,626 km (0.1 R)
- M35: 14,819,015 km (0.045 R)
- M36: 15,733,507 km (0.096 R)
- M37: 18,135,600 km (0.12 R)
- M38: 18,885,684 km (0.092 R)
- M39: 19,112,624 km (0.079 R)
- M40: 19,952,766 km (0.118 R)
- M41: 20,493,712 km (0.119 R)
- M42: 20,571,353 km (0.111 R)
- M43: 21,039,295 km (0.093 R)
- M44: 21,431,989 km (0.054 R)
- M45: 23,512,746 km (0.037 R)
- M46: 23,756,890 km (0.1 R)
- M47: 25,322,880 km (0.108 R)
- M48: 26,497,972 km (0.116 R)
- M49: 31,193,849 km (0.072 R)
- M50: 32,452,416 km (0.083 R)
- M51: 32,542,922 km (0.061 R)
- M52: 34,555,911 km (0.061 R)
- M53: 35,111,817 km (0.106 R)
- M54: 35,390,967 km (0.111 R)
- M55: 36,232,604 km (0.096 R)
- M56: 36,986,278 km (0.104 R)
- M57: 38,126,364 km (0.041 R)
- M58: 38,892,903 km (0.117 R)
- M59: 40,149,376 km (0.077 R)
- M60: 40,538,629 km (0.103 R)
- M61: 40,636,018 km (0.116 R)
- M62: 41,026,917 km (0.035 R)
- M63: 41,124,754 km (0.085 R)
- M64: 42,999,664 km (0.08 R)
- M65: 45,002,929 km (0.073 R)
- M66: 46,321,485 km (0.118 R)
- M67: 47,036,563 km (0.072 R)
- M68: 49,724,687 km (0.098 R)
- M69: 51,403,624 km (0.111 R)
- M70: 52,356,113 km (0.094 R)
- M71: 52,674,906 km (0.096 R)
- M72: 53,635,175 km (0.08 R)
- M73: 54,063,773 km (0.099 R)
- M74: 54,171,184 km (0.063 R)
- M75: 54,816,699 km (0.041 R)
- M76: 56,659,296 km (0.099 R)
- M77: 57,205,179 km (0.058 R)
- M78: 58,742,745 km (0.118 R)
- M79: 59,849,321 km (0.107 R)
- M80: 59,960,472 km (0.116 R)
- M81: 61,522,124 km (0.108 R)
- M82: 62,420,460 km (0.109 R)
- M83: 62,533,107 km (0.1 R)
- M84: 64,003,205 km (0.079 R)
- M85: 66,977,211 km (0.084 R)
- M86: 68,132,854 km (0.116 R)
- M87: 69,178,693 km (0.039 R)
- M88: 70,229,917 km (0.11 R)
- M89: 70,464,187 km (0.056 R)
- M90: 71,286,377 km (0.102 R)
- M91: 74,129,036 km (0.083 R)
- M92: 76,767,195 km (0.047 R)
- M93: 79,436,021 km (0.07 R)
- M94: 80,291,421 km (0.116 R)
- M95: 82,258,334 km (0.062 R)
Kuiper Belt
Range: 30 - 56 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 234 - 16,031 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.