Star System Generated (Seed: 1766226281)
Star Details
Spectral Class: K2V
Temperature: 4,879 K
Mass: 0.74 sol
Luminosity: 0.35 lux
Habitable Zone (HZ)
Inner Boundary: 0.56 AU
Outer Boundary: 0.81 AU
Physical Limits
Snow Line: 2.84 AU
Max System Radius: 17.2 AU
Planetary System (10 Planets)
Planet 1 - Terrestrial
Semi-Major Axis: 0.59 AU
Status: HZ
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 4.85
Radius: 1.88
Gravity: 1.37 G
Time & Orbit
Eccentricity (e): 0.099
Orbit Range: 0.53 AU - 0.65 AU
Year: 192 Days
Day: 45.6 Hours
Environment
Temp: 32 °C
Axial Tilt: 6.1 °
Atmosphere: Nâ‚‚, Oâ‚‚
Biome: Arid/Tundra
Planet 2 - Terrestrial
Semi-Major Axis: 0.91 AU
Status: Outer (Cold)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 1.2
Radius: 1.08
Gravity: 1.03 G
Time & Orbit
Eccentricity (e): 0.092
Orbit Range: 0.83 AU - 0.99 AU
Year: 369 Days
Day: 13.8 Hours
Environment
Temp: -36 °C
Axial Tilt: 19.6 °
Atmosphere: Thin Nâ‚‚/CHâ‚„
Biome: Ice Cap/Desert
Planet 3 - Terrestrial
Semi-Major Axis: 1.08 AU
Status: Outer (Cold)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 4.14
Radius: 1.77
Gravity: 1.32 G
Time & Orbit
Eccentricity (e): 0.212
Orbit Range: 0.85 AU - 1.31 AU
Year: 477 Days
Day: 39.8 Hours
Environment
Temp: -62 °C
Axial Tilt: 3.1 °
Atmosphere: Thin Nâ‚‚/CHâ‚„
Biome: Ice Cap/Desert
Planet 4 - Terrestrial
Semi-Major Axis: 1.21 AU
Status: Outer (Cold)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 2.62
Radius: 1.47
Gravity: 1.21 G
Time & Orbit
Eccentricity (e): 0.239
Orbit Range: 0.92 AU - 1.5 AU
Year: 565 Days
Day: 34.7 Hours
Environment
Temp: -77 °C
Axial Tilt: 16.2 °
Atmosphere: Thin Nâ‚‚/CHâ‚„
Biome: Ice Cap/Desert
Planet 5 - Terrestrial
Semi-Major Axis: 1.97 AU
Status: Outer (Cold)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 4.02
Radius: 1.74
Gravity: 1.33 G
Time & Orbit
Eccentricity (e): 0.222
Orbit Range: 1.53 AU - 2.41 AU
Year: 1174 Days
Day: 32.3 Hours
Environment
Temp: -110 °C
Axial Tilt: 34.3 °
Atmosphere: Thin Nâ‚‚/CHâ‚„
Biome: Ice Cap/Desert
Asteroid Belt
Center: 2.68 AU
Composition
Type: Main (Rocky/Icy Mix)
A dense region of planetesimals and debris.
Boundary
Planet 6 - Gas Giant
Semi-Major Axis: 3.38 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 318.2
Radius: 8.9
Gravity: 4.02 G
Time & Orbit
Eccentricity (e): 0.065
Orbit Range: 3.16 AU - 3.6 AU
Year: 2638 Days
Day: 5.6 Hours
Environment
Temp: -138 °C
Axial Tilt: 39.3 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (66)
Outer Limit: 32,437,332 km
- M1: 113,246 km (0.111 R)
- M2: 177,872 km (0.112 R)
- M3: 385,514 km (0.101 R)
- M4: 473,178 km (0.114 R)
- M5: 671,395 km (0.072 R)
- M6: 748,737 km (0.097 R)
- M7: 813,064 km (0.086 R)
- M8: 982,559 km (0.118 R)
- M9: 1,239,568 km (0.053 R)
- M10: 1,317,060 km (0.106 R)
- M11: 1,476,830 km (0.097 R)
- M12: 1,696,440 km (0.095 R)
- M13: 1,782,907 km (0.099 R)
- M14: 2,017,178 km (0.066 R)
- M15: 2,490,505 km (0.088 R)
- M16: 2,664,338 km (0.072 R)
- M17: 2,842,210 km (0.09 R)
- M18: 3,089,794 km (0.113 R)
- M19: 3,196,159 km (0.111 R)
- M20: 3,263,328 km (0.096 R)
- M21: 3,440,003 km (0.102 R)
- M22: 3,619,969 km (0.076 R)
- M23: 3,676,068 km (0.114 R)
- M24: 3,817,289 km (0.106 R)
- M25: 4,090,754 km (0.106 R)
- M26: 4,311,111 km (0.101 R)
- M27: 4,445,301 km (0.108 R)
- M28: 4,748,236 km (0.09 R)
- M29: 5,136,592 km (0.113 R)
- M30: 5,263,003 km (0.098 R)
- M31: 5,438,631 km (0.08 R)
- M32: 5,535,121 km (0.112 R)
- M33: 5,746,353 km (0.108 R)
- M34: 6,109,876 km (0.082 R)
- M35: 6,227,161 km (0.108 R)
- M36: 6,446,920 km (0.078 R)
- M37: 6,634,815 km (0.112 R)
- M38: 6,894,068 km (0.093 R)
- M39: 6,981,134 km (0.026 R)
- M40: 7,138,960 km (0.113 R)
- M41: 7,297,983 km (0.117 R)
- M42: 7,369,042 km (0.052 R)
- M43: 7,440,250 km (0.07 R)
- M44: 7,982,243 km (0.048 R)
- M45: 8,073,797 km (0.057 R)
- M46: 8,202,601 km (0.1 R)
- M47: 8,462,153 km (0.118 R)
- M48: 8,536,802 km (0.082 R)
- M49: 8,724,548 km (0.059 R)
- M50: 9,353,457 km (0.114 R)
- M51: 9,411,352 km (0.119 R)
- M52: 9,702,768 km (0.102 R)
- M53: 10,254,485 km (0.095 R)
- M54: 10,334,221 km (0.114 R)
- M55: 11,019,678 km (0.118 R)
- M56: 11,886,598 km (0.072 R)
- M57: 11,970,373 km (0.086 R)
- M58: 12,138,371 km (0.106 R)
- M59: 12,540,490 km (0.074 R)
- M60: 12,796,901 km (0.031 R)
- M61: 13,054,808 km (0.042 R)
- M62: 13,927,263 km (0.117 R)
- M63: 14,281,510 km (0.108 R)
- M64: 14,415,251 km (0.081 R)
- M65: 14,571,581 km (0.104 R)
- M66: 14,863,596 km (0.108 R)
Planet 7 - Gas Giant
Semi-Major Axis: 3.64 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 781.1
Radius: 13.1
Gravity: 4.55 G
Time & Orbit
Eccentricity (e): 0.033
Orbit Range: 3.52 AU - 3.76 AU
Year: 2949 Days
Day: 8.7 Hours
Environment
Temp: -157 °C
Axial Tilt: 36.6 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (73)
Outer Limit: 32,437,332 km
- M1: 168,447 km (0.102 R)
- M2: 294,857 km (0.113 R)
- M3: 536,308 km (0.091 R)
- M4: 642,672 km (0.074 R)
- M5: 828,174 km (0.052 R)
- M6: 912,248 km (0.093 R)
- M7: 1,055,563 km (0.09 R)
- M8: 1,171,351 km (0.099 R)
- M9: 1,328,878 km (0.112 R)
- M10: 1,468,004 km (0.109 R)
- M11: 1,638,845 km (0.039 R)
- M12: 1,761,365 km (0.097 R)
- M13: 1,872,816 km (0.107 R)
- M14: 1,958,087 km (0.099 R)
- M15: 2,206,868 km (0.108 R)
- M16: 2,404,487 km (0.087 R)
- M17: 2,576,225 km (0.101 R)
- M18: 2,768,309 km (0.056 R)
- M19: 2,948,724 km (0.053 R)
- M20: 3,167,137 km (0.027 R)
- M21: 3,286,964 km (0.089 R)
- M22: 3,602,018 km (0.117 R)
- M23: 3,908,843 km (0.058 R)
- M24: 4,074,747 km (0.074 R)
- M25: 4,261,894 km (0.069 R)
- M26: 4,375,588 km (0.118 R)
- M27: 4,471,181 km (0.049 R)
- M28: 4,586,671 km (0.117 R)
- M29: 4,781,597 km (0.108 R)
- M30: 5,059,101 km (0.079 R)
- M31: 5,240,264 km (0.12 R)
- M32: 5,444,166 km (0.072 R)
- M33: 6,372,420 km (0.11 R)
- M34: 7,055,933 km (0.096 R)
- M35: 7,213,460 km (0.099 R)
- M36: 7,304,116 km (0.043 R)
- M37: 7,995,557 km (0.106 R)
- M38: 8,136,479 km (0.097 R)
- M39: 8,230,875 km (0.092 R)
- M40: 8,349,356 km (0.032 R)
- M41: 8,877,287 km (0.077 R)
- M42: 9,219,118 km (0.118 R)
- M43: 9,789,834 km (0.063 R)
- M44: 10,143,035 km (0.084 R)
- M45: 10,270,043 km (0.101 R)
- M46: 10,551,736 km (0.097 R)
- M47: 11,070,242 km (0.103 R)
- M48: 11,227,470 km (0.107 R)
- M49: 11,517,540 km (0.089 R)
- M50: 12,429,937 km (0.041 R)
- M51: 12,730,031 km (0.062 R)
- M52: 13,005,141 km (0.045 R)
- M53: 13,282,047 km (0.073 R)
- M54: 13,926,515 km (0.087 R)
- M55: 14,153,006 km (0.112 R)
- M56: 14,295,273 km (0.119 R)
- M57: 14,811,236 km (0.105 R)
- M58: 15,245,818 km (0.108 R)
- M59: 15,479,490 km (0.119 R)
- M60: 15,891,034 km (0.113 R)
- M61: 15,979,596 km (0.091 R)
- M62: 16,187,238 km (0.118 R)
- M63: 17,026,182 km (0.051 R)
- M64: 17,268,531 km (0.082 R)
- M65: 18,466,361 km (0.066 R)
- M66: 18,590,827 km (0.066 R)
- M67: 19,722,684 km (0.113 R)
- M68: 20,041,028 km (0.072 R)
- M69: 20,521,836 km (0.099 R)
- M70: 20,779,743 km (0.036 R)
- M71: 21,168,847 km (0.047 R)
- M72: 21,560,195 km (0.119 R)
- M73: 22,118,793 km (0.041 R)
Planet 8 - Gas Giant
Semi-Major Axis: 3.98 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 774.4
Radius: 11.1
Gravity: 6.29 G
Time & Orbit
Eccentricity (e): 0.031
Orbit Range: 3.86 AU - 4.1 AU
Year: 3371 Days
Day: 8 Hours
Environment
Temp: -147 °C
Axial Tilt: 24.4 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (73)
Outer Limit: 32,437,332 km
- M1: 140,173 km (0.06 R)
- M2: 216,468 km (0.064 R)
- M3: 383,120 km (0.045 R)
- M4: 456,722 km (0.032 R)
- M5: 574,007 km (0.081 R)
- M6: 692,489 km (0.088 R)
- M7: 798,254 km (0.11 R)
- M8: 933,042 km (0.09 R)
- M9: 1,003,503 km (0.076 R)
- M10: 1,112,859 km (0.086 R)
- M11: 1,438,533 km (0.1 R)
- M12: 1,706,164 km (0.03 R)
- M13: 2,145,533 km (0.047 R)
- M14: 2,289,147 km (0.119 R)
- M15: 2,452,358 km (0.112 R)
- M16: 2,983,430 km (0.117 R)
- M17: 3,108,195 km (0.115 R)
- M18: 3,198,552 km (0.057 R)
- M19: 3,271,406 km (0.072 R)
- M20: 3,797,093 km (0.096 R)
- M21: 4,189,040 km (0.057 R)
- M22: 4,573,357 km (0.109 R)
- M23: 4,759,456 km (0.055 R)
- M24: 5,139,136 km (0.054 R)
- M25: 5,506,847 km (0.12 R)
- M26: 5,816,066 km (0.108 R)
- M27: 6,018,023 km (0.099 R)
- M28: 6,290,740 km (0.048 R)
- M29: 6,382,593 km (0.108 R)
- M30: 6,497,933 km (0.08 R)
- M31: 7,037,832 km (0.065 R)
- M32: 7,133,275 km (0.112 R)
- M33: 7,421,999 km (0.113 R)
- M34: 7,543,473 km (0.065 R)
- M35: 7,739,296 km (0.027 R)
- M36: 8,261,094 km (0.111 R)
- M37: 9,601,939 km (0.096 R)
- M38: 10,108,627 km (0.083 R)
- M39: 10,569,389 km (0.097 R)
- M40: 10,651,368 km (0.034 R)
- M41: 10,733,647 km (0.09 R)
- M42: 10,898,654 km (0.078 R)
- M43: 11,203,684 km (0.067 R)
- M44: 11,315,284 km (0.096 R)
- M45: 11,539,531 km (0.104 R)
- M46: 11,850,246 km (0.117 R)
- M47: 12,307,417 km (0.114 R)
- M48: 12,828,466 km (0.078 R)
- M49: 13,268,134 km (0.073 R)
- M50: 14,404,330 km (0.052 R)
- M51: 14,525,804 km (0.103 R)
- M52: 14,892,019 km (0.117 R)
- M53: 15,199,742 km (0.106 R)
- M54: 15,416,210 km (0.082 R)
- M55: 15,509,410 km (0.059 R)
- M56: 15,852,438 km (0.052 R)
- M57: 15,977,801 km (0.096 R)
- M58: 18,257,672 km (0.111 R)
- M59: 18,356,257 km (0.11 R)
- M60: 18,554,026 km (0.101 R)
- M61: 20,058,980 km (0.088 R)
- M62: 20,535,150 km (0.063 R)
- M63: 20,980,653 km (0.088 R)
- M64: 21,394,739 km (0.091 R)
- M65: 21,672,244 km (0.087 R)
- M66: 21,916,088 km (0.077 R)
- M67: 22,265,997 km (0.051 R)
- M68: 22,406,470 km (0.108 R)
- M69: 22,476,930 km (0.107 R)
- M70: 22,582,547 km (0.053 R)
- M71: 23,077,865 km (0.045 R)
- M72: 23,255,737 km (0.068 R)
- M73: 23,576,924 km (0.086 R)
Planet 9 - Gas Giant
Semi-Major Axis: 5.7 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 355.6
Radius: 8.3
Gravity: 5.16 G
Time & Orbit
Eccentricity (e): 0.149
Orbit Range: 4.85 AU - 6.55 AU
Year: 5778 Days
Day: 13.2 Hours
Environment
Temp: -169 °C
Axial Tilt: 35.3 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (81)
Outer Limit: 32,437,332 km
- M1: 115,639 km (0.111 R)
- M2: 202,256 km (0.063 R)
- M3: 316,250 km (0.093 R)
- M4: 418,874 km (0.068 R)
- M5: 596,297 km (0.084 R)
- M6: 1,237,623 km (0.118 R)
- M7: 1,322,296 km (0.027 R)
- M8: 1,423,723 km (0.096 R)
- M9: 1,871,320 km (0.044 R)
- M10: 2,035,429 km (0.032 R)
- M11: 2,290,643 km (0.108 R)
- M12: 2,395,660 km (0.116 R)
- M13: 2,520,126 km (0.092 R)
- M14: 2,665,086 km (0.117 R)
- M15: 2,982,383 km (0.099 R)
- M16: 3,430,878 km (0.086 R)
- M17: 4,005,333 km (0.117 R)
- M18: 4,217,762 km (0.042 R)
- M19: 4,764,991 km (0.026 R)
- M20: 5,081,241 km (0.112 R)
- M21: 5,195,833 km (0.091 R)
- M22: 5,474,384 km (0.072 R)
- M23: 5,997,827 km (0.088 R)
- M24: 6,094,767 km (0.071 R)
- M25: 6,990,110 km (0.081 R)
- M26: 7,531,355 km (0.101 R)
- M27: 7,979,251 km (0.094 R)
- M28: 8,032,508 km (0.088 R)
- M29: 8,246,882 km (0.091 R)
- M30: 8,681,164 km (0.113 R)
- M31: 8,735,917 km (0.061 R)
- M32: 9,067,277 km (0.078 R)
- M33: 9,234,377 km (0.093 R)
- M34: 9,685,265 km (0.049 R)
- M35: 10,172,206 km (0.08 R)
- M36: 10,667,076 km (0.095 R)
- M37: 10,784,660 km (0.118 R)
- M38: 10,902,693 km (0.11 R)
- M39: 11,229,564 km (0.112 R)
- M40: 11,439,151 km (0.085 R)
- M41: 11,529,508 km (0.083 R)
- M42: 12,911,343 km (0.062 R)
- M43: 13,005,440 km (0.048 R)
- M44: 13,194,083 km (0.085 R)
- M45: 13,574,062 km (0.069 R)
- M46: 13,701,519 km (0.109 R)
- M47: 13,797,412 km (0.12 R)
- M48: 13,861,440 km (0.06 R)
- M49: 13,957,781 km (0.056 R)
- M50: 14,215,538 km (0.079 R)
- M51: 14,833,975 km (0.11 R)
- M52: 15,064,057 km (0.114 R)
- M53: 15,694,462 km (0.102 R)
- M54: 15,794,842 km (0.091 R)
- M55: 16,063,371 km (0.107 R)
- M56: 16,164,499 km (0.044 R)
- M57: 16,333,544 km (0.119 R)
- M58: 17,290,821 km (0.115 R)
- M59: 17,394,492 km (0.105 R)
- M60: 17,463,607 km (0.106 R)
- M61: 18,796,075 km (0.074 R)
- M62: 19,295,133 km (0.097 R)
- M63: 19,510,405 km (0.108 R)
- M64: 19,726,424 km (0.098 R)
- M65: 19,979,394 km (0.112 R)
- M66: 20,379,269 km (0.056 R)
- M67: 20,488,775 km (0.1 R)
- M68: 20,635,081 km (0.119 R)
- M69: 21,076,096 km (0.109 R)
- M70: 21,223,749 km (0.114 R)
- M71: 21,446,052 km (0.076 R)
- M72: 21,817,952 km (0.098 R)
- M73: 22,042,199 km (0.103 R)
- M74: 22,681,730 km (0.102 R)
- M75: 22,795,275 km (0.098 R)
- M76: 22,984,815 km (0.103 R)
- M77: 23,556,728 km (0.117 R)
- M78: 24,249,067 km (0.102 R)
- M79: 24,597,929 km (0.052 R)
- M80: 25,026,377 km (0.095 R)
- M81: 25,535,908 km (0.065 R)
Planet 10 - Gas Giant
Semi-Major Axis: 5.72 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 629.2
Radius: 10.3
Gravity: 5.93 G
Time & Orbit
Eccentricity (e): 0.208
Orbit Range: 4.53 AU - 6.91 AU
Year: 5809 Days
Day: 10.3 Hours
Environment
Temp: -170 °C
Axial Tilt: 46.9 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (84)
Outer Limit: 32,437,332 km
- M1: 212,728 km (0.09 R)
- M2: 489,335 km (0.083 R)
- M3: 614,847 km (0.067 R)
- M4: 701,016 km (0.081 R)
- M5: 886,816 km (0.046 R)
- M6: 971,489 km (0.096 R)
- M7: 1,044,492 km (0.106 R)
- M8: 1,211,743 km (0.119 R)
- M9: 1,355,357 km (0.09 R)
- M10: 2,099,756 km (0.112 R)
- M11: 2,254,290 km (0.078 R)
- M12: 2,372,772 km (0.046 R)
- M13: 2,616,018 km (0.078 R)
- M14: 2,782,820 km (0.117 R)
- M15: 3,039,679 km (0.119 R)
- M16: 3,530,510 km (0.114 R)
- M17: 3,599,325 km (0.087 R)
- M18: 3,879,522 km (0.038 R)
- M19: 4,118,429 km (0.092 R)
- M20: 4,386,808 km (0.118 R)
- M21: 4,966,500 km (0.087 R)
- M22: 5,121,782 km (0.117 R)
- M23: 5,357,549 km (0.105 R)
- M24: 5,785,847 km (0.097 R)
- M25: 5,867,378 km (0.102 R)
- M26: 6,760,926 km (0.039 R)
- M27: 6,961,986 km (0.102 R)
- M28: 7,370,238 km (0.09 R)
- M29: 7,458,651 km (0.092 R)
- M30: 7,607,052 km (0.081 R)
- M31: 7,756,350 km (0.105 R)
- M32: 8,517,205 km (0.102 R)
- M33: 9,397,738 km (0.034 R)
- M34: 9,622,285 km (0.1 R)
- M35: 9,881,239 km (0.063 R)
- M36: 10,241,021 km (0.088 R)
- M37: 10,406,028 km (0.099 R)
- M38: 10,839,114 km (0.072 R)
- M39: 11,448,426 km (0.099 R)
- M40: 11,619,715 km (0.112 R)
- M41: 11,757,345 km (0.12 R)
- M42: 11,895,574 km (0.117 R)
- M43: 11,999,544 km (0.069 R)
- M44: 12,243,389 km (0.09 R)
- M45: 12,594,495 km (0.066 R)
- M46: 12,913,288 km (0.101 R)
- M47: 13,199,020 km (0.119 R)
- M48: 13,414,740 km (0.06 R)
- M49: 13,523,049 km (0.098 R)
- M50: 14,473,444 km (0.032 R)
- M51: 15,256,888 km (0.088 R)
- M52: 15,445,382 km (0.059 R)
- M53: 15,786,764 km (0.072 R)
- M54: 16,015,649 km (0.094 R)
- M55: 16,284,177 km (0.111 R)
- M56: 16,477,009 km (0.104 R)
- M57: 16,748,080 km (0.085 R)
- M58: 17,688,602 km (0.048 R)
- M59: 18,686,569 km (0.074 R)
- M60: 18,847,985 km (0.079 R)
- M61: 19,212,855 km (0.063 R)
- M62: 19,416,457 km (0.065 R)
- M63: 19,661,798 km (0.062 R)
- M64: 19,908,185 km (0.117 R)
- M65: 20,279,787 km (0.108 R)
- M66: 20,862,171 km (0.03 R)
- M67: 20,987,833 km (0.11 R)
- M68: 22,001,060 km (0.077 R)
- M69: 22,171,601 km (0.04 R)
- M70: 22,299,657 km (0.096 R)
- M71: 23,725,175 km (0.072 R)
- M72: 24,206,880 km (0.087 R)
- M73: 25,002,143 km (0.114 R)
- M74: 25,850,811 km (0.119 R)
- M75: 27,530,496 km (0.036 R)
- M76: 27,760,129 km (0.084 R)
- M77: 28,129,037 km (0.101 R)
- M78: 29,245,337 km (0.114 R)
- M79: 29,432,783 km (0.091 R)
- M80: 29,667,651 km (0.099 R)
- M81: 30,139,184 km (0.099 R)
- M82: 30,281,152 km (0.078 R)
- M83: 31,185,471 km (0.1 R)
- M84: 31,857,465 km (0.058 R)
Kuiper Belt
Range: 30 - 55 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 348 - 10,365 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.