Star System Generated (Seed: 1768263911)
Star Details
Spectral Class: K4V
Temperature: 4,557 K
Mass: 0.71 sol
Luminosity: 0.3 lux
Habitable Zone (HZ)
Inner Boundary: 0.52 AU
Outer Boundary: 0.75 AU
Physical Limits
Snow Line: 2.63 AU
Max System Radius: 16.9 AU
Planetary System (6 Planets)
Planet 1 - Terrestrial
Semi-Major Axis: 1.89 AU
Status: Outer (Cold)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 1.01
Radius: 1
Gravity: 1.01 G
Time & Orbit
Eccentricity (e): 0.011
Orbit Range: 1.87 AU - 1.91 AU
Year: 1126 Days
Day: 15.3 Hours
Environment
Temp: -103 °C
Axial Tilt: 36.1 °
Atmosphere: Thin Nâ‚‚/CHâ‚„
Biome: Ice Cap/Desert
Planet 2 - Gas Giant
Semi-Major Axis: 3.32 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 978.3
Radius: 10.4
Gravity: 9.04 G
Time & Orbit
Eccentricity (e): 0.073
Orbit Range: 3.08 AU - 3.56 AU
Year: 2622 Days
Day: 9.6 Hours
Environment
Temp: -145 °C
Axial Tilt: 48.4 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (72)
Outer Limit: 76,807,632 km
- M1: 151,393 km (0.072 R)
- M2: 382,522 km (0.038 R)
- M3: 866,620 km (0.065 R)
- M4: 975,528 km (0.102 R)
- M5: 1,136,196 km (0.116 R)
- M6: 1,219,821 km (0.091 R)
- M7: 1,656,796 km (0.107 R)
- M8: 1,864,588 km (0.075 R)
- M9: 2,022,414 km (0.075 R)
- M10: 2,184,877 km (0.063 R)
- M11: 2,305,752 km (0.061 R)
- M12: 2,475,695 km (0.077 R)
- M13: 2,730,460 km (0.115 R)
- M14: 2,795,386 km (0.109 R)
- M15: 3,179,553 km (0.065 R)
- M16: 3,299,830 km (0.1 R)
- M17: 3,850,799 km (0.112 R)
- M18: 3,923,952 km (0.113 R)
- M19: 4,090,455 km (0.096 R)
- M20: 4,720,710 km (0.093 R)
- M21: 4,818,847 km (0.101 R)
- M22: 5,017,213 km (0.066 R)
- M23: 5,504,454 km (0.114 R)
- M24: 5,985,710 km (0.077 R)
- M25: 6,070,682 km (0.081 R)
- M26: 6,177,644 km (0.038 R)
- M27: 6,633,618 km (0.073 R)
- M28: 6,810,144 km (0.101 R)
- M29: 6,966,025 km (0.069 R)
- M30: 7,190,571 km (0.101 R)
- M31: 7,326,556 km (0.102 R)
- M32: 7,394,922 km (0.112 R)
- M33: 7,554,992 km (0.098 R)
- M34: 7,972,220 km (0.098 R)
- M35: 8,183,752 km (0.089 R)
- M36: 8,516,308 km (0.077 R)
- M37: 8,636,135 km (0.082 R)
- M38: 9,121,281 km (0.116 R)
- M39: 9,268,486 km (0.083 R)
- M40: 9,416,588 km (0.075 R)
- M41: 9,590,420 km (0.112 R)
- M42: 9,665,070 km (0.082 R)
- M43: 9,991,492 km (0.103 R)
- M44: 10,067,338 km (0.105 R)
- M45: 10,992,152 km (0.1 R)
- M46: 11,122,901 km (0.114 R)
- M47: 11,359,266 km (0.12 R)
- M48: 12,051,604 km (0.113 R)
- M49: 12,894,888 km (0.117 R)
- M50: 13,087,869 km (0.089 R)
- M51: 13,309,723 km (0.106 R)
- M52: 13,588,872 km (0.088 R)
- M53: 14,152,707 km (0.083 R)
- M54: 14,408,968 km (0.098 R)
- M55: 14,781,915 km (0.083 R)
- M56: 14,926,128 km (0.118 R)
- M57: 15,332,585 km (0.038 R)
- M58: 15,654,520 km (0.113 R)
- M59: 15,889,987 km (0.066 R)
- M60: 16,037,789 km (0.115 R)
- M61: 17,571,317 km (0.104 R)
- M62: 17,724,206 km (0.108 R)
- M63: 18,402,034 km (0.067 R)
- M64: 19,025,708 km (0.094 R)
- M65: 19,277,032 km (0.103 R)
- M66: 19,497,988 km (0.05 R)
- M67: 19,783,122 km (0.098 R)
- M68: 19,910,429 km (0.081 R)
- M69: 20,037,887 km (0.056 R)
- M70: 20,229,522 km (0.099 R)
- M71: 20,679,362 km (0.049 R)
- M72: 20,776,152 km (0.067 R)
Planet 3 - Gas Giant
Semi-Major Axis: 5.05 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 404.9
Radius: 8.8
Gravity: 5.23 G
Time & Orbit
Eccentricity (e): 0.201
Orbit Range: 4.03 AU - 6.07 AU
Year: 4919 Days
Day: 8.2 Hours
Environment
Temp: -165 °C
Axial Tilt: 20.1 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (84)
Outer Limit: 76,807,632 km
- M1: 294,259 km (0.065 R)
- M2: 396,883 km (0.062 R)
- M3: 695,481 km (0.04 R)
- M4: 828,772 km (0.041 R)
- M5: 970,741 km (0.097 R)
- M6: 1,375,104 km (0.066 R)
- M7: 1,430,904 km (0.105 R)
- M8: 1,647,222 km (0.093 R)
- M9: 1,706,762 km (0.115 R)
- M10: 1,812,677 km (0.027 R)
- M11: 1,874,312 km (0.09 R)
- M12: 1,983,817 km (0.114 R)
- M13: 2,079,410 km (0.105 R)
- M14: 2,160,193 km (0.119 R)
- M15: 2,308,445 km (0.067 R)
- M16: 2,511,299 km (0.081 R)
- M17: 2,667,330 km (0.097 R)
- M18: 2,773,245 km (0.11 R)
- M19: 3,007,366 km (0.096 R)
- M20: 3,099,069 km (0.09 R)
- M21: 3,154,720 km (0.085 R)
- M22: 3,342,166 km (0.077 R)
- M23: 3,475,757 km (0.056 R)
- M24: 4,007,129 km (0.117 R)
- M25: 4,438,120 km (0.098 R)
- M26: 4,712,333 km (0.088 R)
- M27: 5,013,922 km (0.063 R)
- M28: 5,299,505 km (0.117 R)
- M29: 5,366,225 km (0.119 R)
- M30: 5,477,975 km (0.091 R)
- M31: 6,025,204 km (0.118 R)
- M32: 6,376,160 km (0.091 R)
- M33: 6,447,219 km (0.057 R)
- M34: 7,220,790 km (0.101 R)
- M35: 7,493,507 km (0.092 R)
- M36: 7,643,703 km (0.117 R)
- M37: 7,972,519 km (0.075 R)
- M38: 8,280,093 km (0.046 R)
- M39: 8,487,435 km (0.055 R)
- M40: 8,775,261 km (0.105 R)
- M41: 9,253,227 km (0.071 R)
- M42: 9,414,344 km (0.097 R)
- M43: 9,522,353 km (0.068 R)
- M44: 9,657,889 km (0.1 R)
- M45: 10,068,535 km (0.06 R)
- M46: 10,178,938 km (0.105 R)
- M47: 10,289,790 km (0.095 R)
- M48: 10,401,091 km (0.113 R)
- M49: 10,652,864 km (0.069 R)
- M50: 11,305,410 km (0.071 R)
- M51: 11,535,492 km (0.076 R)
- M52: 12,088,106 km (0.096 R)
- M53: 12,858,236 km (0.055 R)
- M54: 13,008,133 km (0.059 R)
- M55: 13,098,341 km (0.117 R)
- M56: 14,012,234 km (0.042 R)
- M57: 14,476,736 km (0.091 R)
- M58: 14,664,032 km (0.103 R)
- M59: 15,104,149 km (0.111 R)
- M60: 15,167,429 km (0.091 R)
- M61: 15,772,403 km (0.118 R)
- M62: 16,126,351 km (0.071 R)
- M63: 16,190,978 km (0.096 R)
- M64: 16,547,918 km (0.078 R)
- M65: 16,710,980 km (0.104 R)
- M66: 16,809,116 km (0.082 R)
- M67: 16,940,313 km (0.045 R)
- M68: 17,104,721 km (0.058 R)
- M69: 17,236,667 km (0.118 R)
- M70: 17,601,237 km (0.066 R)
- M71: 18,001,710 km (0.07 R)
- M72: 18,540,562 km (0.095 R)
- M73: 19,084,649 km (0.061 R)
- M74: 19,153,015 km (0.092 R)
- M75: 19,565,008 km (0.113 R)
- M76: 20,292,951 km (0.091 R)
- M77: 20,959,260 km (0.092 R)
- M78: 21,135,786 km (0.057 R)
- M79: 22,529,739 km (0.103 R)
- M80: 22,891,915 km (0.097 R)
- M81: 23,292,688 km (0.107 R)
- M82: 24,100,815 km (0.067 R)
- M83: 24,471,369 km (0.095 R)
- M84: 24,918,368 km (0.102 R)
Planet 4 - Gas Giant
Semi-Major Axis: 7.36 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 213.3
Radius: 8.8
Gravity: 2.75 G
Time & Orbit
Eccentricity (e): 0.14
Orbit Range: 6.33 AU - 8.39 AU
Year: 8655 Days
Day: 12.9 Hours
Environment
Temp: -188 °C
Axial Tilt: 19.2 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (84)
Outer Limit: 76,807,632 km
- M1: 119,828 km (0.115 R)
- M2: 269,875 km (0.1 R)
- M3: 327,171 km (0.118 R)
- M4: 1,067,082 km (0.086 R)
- M5: 1,301,053 km (0.115 R)
- M6: 1,408,614 km (0.101 R)
- M7: 1,834,369 km (0.07 R)
- M8: 1,973,196 km (0.11 R)
- M9: 2,133,714 km (0.049 R)
- M10: 2,224,820 km (0.088 R)
- M11: 2,448,618 km (0.061 R)
- M12: 2,838,021 km (0.117 R)
- M13: 3,142,902 km (0.119 R)
- M14: 3,437,011 km (0.103 R)
- M15: 3,522,731 km (0.09 R)
- M16: 3,718,105 km (0.104 R)
- M17: 3,939,510 km (0.038 R)
- M18: 4,074,448 km (0.084 R)
- M19: 4,142,365 km (0.044 R)
- M20: 4,279,696 km (0.065 R)
- M21: 4,676,729 km (0.116 R)
- M22: 4,843,530 km (0.115 R)
- M23: 5,134,349 km (0.082 R)
- M24: 6,040,612 km (0.088 R)
- M25: 6,144,433 km (0.085 R)
- M26: 6,380,050 km (0.079 R)
- M27: 6,512,145 km (0.104 R)
- M28: 6,618,659 km (0.061 R)
- M29: 6,833,182 km (0.067 R)
- M30: 7,214,208 km (0.097 R)
- M31: 7,462,839 km (0.061 R)
- M32: 7,574,290 km (0.052 R)
- M33: 7,940,206 km (0.114 R)
- M34: 8,369,702 km (0.115 R)
- M35: 9,013,122 km (0.061 R)
- M36: 9,131,903 km (0.109 R)
- M37: 9,794,023 km (0.111 R)
- M38: 10,974,051 km (0.111 R)
- M39: 11,132,625 km (0.097 R)
- M40: 11,323,960 km (0.113 R)
- M41: 12,231,272 km (0.088 R)
- M42: 12,693,679 km (0.104 R)
- M43: 12,860,181 km (0.118 R)
- M44: 13,533,521 km (0.101 R)
- M45: 13,908,862 km (0.107 R)
- M46: 14,391,465 km (0.087 R)
- M47: 14,879,453 km (0.071 R)
- M48: 15,337,522 km (0.075 R)
- M49: 15,621,758 km (0.106 R)
- M50: 16,484,638 km (0.073 R)
- M51: 16,922,062 km (0.078 R)
- M52: 17,105,320 km (0.097 R)
- M53: 17,252,524 km (0.045 R)
- M54: 17,548,129 km (0.026 R)
- M55: 17,622,180 km (0.077 R)
- M56: 17,733,631 km (0.091 R)
- M57: 18,369,422 km (0.079 R)
- M58: 18,444,819 km (0.077 R)
- M59: 18,671,310 km (0.087 R)
- M60: 19,088,987 km (0.091 R)
- M61: 19,203,430 km (0.044 R)
- M62: 19,356,319 km (0.091 R)
- M63: 19,433,063 km (0.1 R)
- M64: 19,586,550 km (0.112 R)
- M65: 20,947,442 km (0.11 R)
- M66: 21,026,130 km (0.059 R)
- M67: 21,381,425 km (0.091 R)
- M68: 21,659,079 km (0.081 R)
- M69: 22,097,999 km (0.082 R)
- M70: 22,178,034 km (0.095 R)
- M71: 22,258,218 km (0.093 R)
- M72: 22,418,887 km (0.12 R)
- M73: 23,759,283 km (0.084 R)
- M74: 24,005,821 km (0.111 R)
- M75: 24,211,817 km (0.053 R)
- M76: 24,667,342 km (0.025 R)
- M77: 25,083,823 km (0.102 R)
- M78: 25,502,547 km (0.079 R)
- M79: 25,797,106 km (0.058 R)
- M80: 26,177,383 km (0.094 R)
- M81: 26,559,606 km (0.039 R)
- M82: 28,063,513 km (0.087 R)
- M83: 28,847,556 km (0.113 R)
- M84: 28,979,052 km (0.098 R)
Planet 5 - Ice Giant
Semi-Major Axis: 13.16 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 524.4
Radius: 3.5
Gravity: 42.81 G
Time & Orbit
Eccentricity (e): 0.243
Orbit Range: 9.96 AU - 16.36 AU
Year: 20694 Days
Day: 21.2 Hours
Environment
Temp: -198 °C
Axial Tilt: 29.5 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (94)
Outer Limit: 76,807,632 km
- M1: 201,209 km (0.038 R)
- M2: 341,831 km (0.076 R)
- M3: 887,415 km (0.059 R)
- M4: 1,222,813 km (0.039 R)
- M5: 1,250,189 km (0.059 R)
- M6: 1,806,993 km (0.115 R)
- M7: 1,838,259 km (0.057 R)
- M8: 2,327,743 km (0.11 R)
- M9: 3,001,681 km (0.096 R)
- M10: 3,188,529 km (0.096 R)
- M11: 3,226,377 km (0.064 R)
- M12: 3,417,713 km (0.054 R)
- M13: 3,891,789 km (0.081 R)
- M14: 4,095,391 km (0.105 R)
- M15: 4,470,433 km (0.036 R)
- M16: 4,640,676 km (0.085 R)
- M17: 5,208,699 km (0.12 R)
- M18: 6,171,361 km (0.064 R)
- M19: 7,336,728 km (0.073 R)
- M20: 7,893,083 km (0.068 R)
- M21: 8,410,542 km (0.109 R)
- M22: 8,620,577 km (0.108 R)
- M23: 9,806,440 km (0.099 R)
- M24: 9,861,492 km (0.09 R)
- M25: 10,138,547 km (0.083 R)
- M26: 10,643,739 km (0.09 R)
- M27: 11,157,009 km (0.03 R)
- M28: 11,272,200 km (0.115 R)
- M29: 11,561,821 km (0.051 R)
- M30: 12,148,544 km (0.08 R)
- M31: 12,207,635 km (0.12 R)
- M32: 12,744,691 km (0.096 R)
- M33: 14,214,042 km (0.091 R)
- M34: 14,968,613 km (0.119 R)
- M35: 15,929,929 km (0.108 R)
- M36: 16,059,631 km (0.059 R)
- M37: 16,124,706 km (0.044 R)
- M38: 16,189,631 km (0.115 R)
- M39: 17,109,658 km (0.026 R)
- M40: 17,375,643 km (0.08 R)
- M41: 18,317,212 km (0.098 R)
- M42: 18,521,114 km (0.091 R)
- M43: 19,068,642 km (0.074 R)
- M44: 19,482,729 km (0.094 R)
- M45: 20,109,395 km (0.114 R)
- M46: 20,955,221 km (0.086 R)
- M47: 21,740,610 km (0.092 R)
- M48: 21,956,629 km (0.11 R)
- M49: 22,973,446 km (0.079 R)
- M50: 23,413,862 km (0.104 R)
- M51: 23,561,365 km (0.075 R)
- M52: 25,354,595 km (0.088 R)
- M53: 25,505,988 km (0.029 R)
- M54: 26,114,702 km (0.106 R)
- M55: 27,734,996 km (0.11 R)
- M56: 28,282,375 km (0.051 R)
- M57: 28,596,680 km (0.111 R)
- M58: 30,910,062 km (0.08 R)
- M59: 31,071,777 km (0.118 R)
- M60: 32,048,053 km (0.053 R)
- M61: 32,457,951 km (0.113 R)
- M62: 33,365,561 km (0.083 R)
- M63: 35,713,200 km (0.109 R)
- M64: 35,798,022 km (0.042 R)
- M65: 36,478,992 km (0.103 R)
- M66: 36,992,711 km (0.038 R)
- M67: 37,767,478 km (0.059 R)
- M68: 37,940,414 km (0.05 R)
- M69: 41,542,581 km (0.09 R)
- M70: 41,631,741 km (0.061 R)
- M71: 42,258,107 km (0.085 R)
- M72: 44,702,686 km (0.086 R)
- M73: 46,080,632 km (0.087 R)
- M74: 46,172,934 km (0.071 R)
- M75: 46,450,438 km (0.118 R)
- M76: 47,099,842 km (0.105 R)
- M77: 47,192,892 km (0.111 R)
- M78: 50,677,625 km (0.079 R)
- M79: 51,346,178 km (0.094 R)
- M80: 51,633,555 km (0.076 R)
- M81: 56,501,620 km (0.106 R)
- M82: 57,791,153 km (0.058 R)
- M83: 58,789,719 km (0.088 R)
- M84: 60,601,200 km (0.111 R)
- M85: 60,803,755 km (0.053 R)
- M86: 61,310,743 km (0.114 R)
- M87: 61,717,350 km (0.057 R)
- M88: 61,819,226 km (0.093 R)
- M89: 63,558,301 km (0.092 R)
- M90: 63,661,075 km (0.116 R)
- M91: 64,898,997 km (0.081 R)
- M92: 66,040,728 km (0.098 R)
- M93: 66,457,657 km (0.087 R)
- M94: 70,460,747 km (0.095 R)
Planet 6 - Ice Giant
Semi-Major Axis: 13.4 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 623.4
Radius: 7.6
Gravity: 10.79 G
Time & Orbit
Eccentricity (e): 0.159
Orbit Range: 11.27 AU - 15.53 AU
Year: 21263 Days
Day: 16.2 Hours
Environment
Temp: -208 °C
Axial Tilt: 36.8 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (92)
Outer Limit: 76,807,632 km
- M1: 113,994 km (0.107 R)
- M2: 295,456 km (0.106 R)
- M3: 618,438 km (0.1 R)
- M4: 731,384 km (0.091 R)
- M5: 952,190 km (0.064 R)
- M6: 1,454,839 km (0.11 R)
- M7: 2,817,227 km (0.107 R)
- M8: 2,931,520 km (0.051 R)
- M9: 3,283,374 km (0.115 R)
- M10: 3,648,842 km (0.082 R)
- M11: 3,857,381 km (0.067 R)
- M12: 7,059,075 km (0.087 R)
- M13: 7,795,545 km (0.111 R)
- M14: 8,611,601 km (0.085 R)
- M15: 9,001,603 km (0.117 R)
- M16: 9,741,215 km (0.029 R)
- M17: 10,030,986 km (0.092 R)
- M18: 10,976,893 km (0.083 R)
- M19: 11,766,321 km (0.079 R)
- M20: 11,827,806 km (0.091 R)
- M21: 12,012,859 km (0.119 R)
- M22: 12,385,956 km (0.095 R)
- M23: 13,527,986 km (0.05 R)
- M24: 14,176,792 km (0.09 R)
- M25: 14,637,104 km (0.088 R)
- M26: 16,389,195 km (0.113 R)
- M27: 16,595,490 km (0.058 R)
- M28: 17,219,912 km (0.05 R)
- M29: 18,206,510 km (0.057 R)
- M30: 18,563,151 km (0.053 R)
- M31: 19,066,548 km (0.1 R)
- M32: 19,574,433 km (0.076 R)
- M33: 20,013,203 km (0.106 R)
- M34: 20,603,367 km (0.047 R)
- M35: 22,103,684 km (0.049 R)
- M36: 22,407,966 km (0.05 R)
- M37: 23,097,612 km (0.082 R)
- M38: 24,655,075 km (0.11 R)
- M39: 24,970,577 km (0.087 R)
- M40: 26,246,198 km (0.112 R)
- M41: 26,407,166 km (0.111 R)
- M42: 26,810,930 km (0.108 R)
- M43: 27,054,177 km (0.081 R)
- M44: 27,952,213 km (0.09 R)
- M45: 28,777,245 km (0.092 R)
- M46: 29,109,502 km (0.102 R)
- M47: 30,535,618 km (0.056 R)
- M48: 31,214,643 km (0.077 R)
- M49: 31,555,876 km (0.076 R)
- M50: 31,984,324 km (0.109 R)
- M51: 32,414,717 km (0.039 R)
- M52: 32,501,035 km (0.083 R)
- M53: 35,214,142 km (0.098 R)
- M54: 35,480,426 km (0.032 R)
- M55: 35,569,437 km (0.088 R)
- M56: 37,183,149 km (0.059 R)
- M57: 38,272,222 km (0.03 R)
- M58: 40,017,730 km (0.103 R)
- M59: 40,574,383 km (0.104 R)
- M60: 41,320,577 km (0.1 R)
- M61: 41,883,215 km (0.117 R)
- M62: 41,977,163 km (0.062 R)
- M63: 42,448,246 km (0.051 R)
- M64: 43,776,675 km (0.025 R)
- M65: 44,158,748 km (0.116 R)
- M66: 44,350,234 km (0.032 R)
- M67: 44,637,910 km (0.066 R)
- M68: 45,311,549 km (0.114 R)
- M69: 45,408,190 km (0.056 R)
- M70: 45,794,900 km (0.077 R)
- M71: 49,026,962 km (0.082 R)
- M72: 50,020,890 km (0.096 R)
- M73: 50,820,641 km (0.046 R)
- M74: 50,921,021 km (0.112 R)
- M75: 53,449,374 km (0.1 R)
- M76: 54,574,799 km (0.091 R)
- M77: 58,732,573 km (0.104 R)
- M78: 61,062,260 km (0.11 R)
- M79: 63,422,167 km (0.111 R)
- M80: 64,830,631 km (0.072 R)
- M81: 65,921,050 km (0.06 R)
- M82: 66,797,843 km (0.099 R)
- M83: 67,678,376 km (0.111 R)
- M84: 67,788,630 km (0.099 R)
- M85: 69,562,262 km (0.106 R)
- M86: 70,008,064 km (0.074 R)
- M87: 71,014,558 km (0.104 R)
- M88: 73,494,891 km (0.034 R)
- M89: 73,835,375 km (0.089 R)
- M90: 74,062,615 km (0.098 R)
- M91: 76,692,545 km (0.106 R)
- M92: 76,807,586 km (0.047 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: 497 - 15,723 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.