Star System Generated (Seed: 1767183149)
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: 0.57 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 100.1
Radius: 11.8
Gravity: 0.72 G
Time & Orbit
Eccentricity (e): 0.185
Orbit Range: 0.46 AU - 0.68 AU
Year: 287 Days
Day: 12.2 Hours
Environment
Temp: -141 °C
Axial Tilt: 2.5 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (18)
Outer Limit: 77,658,261 km
- M1: 146,756 km (0.067 R)
- M2: 248,332 km (0.119 R)
- M3: 321,935 km (0.118 R)
- M4: 454,778 km (0.112 R)
- M5: 880,383 km (0.117 R)
- M6: 998,416 km (0.118 R)
- M7: 1,132,306 km (0.089 R)
- M8: 1,350,570 km (0.095 R)
- M9: 1,424,621 km (0.104 R)
- M10: 1,511,387 km (0.031 R)
- M11: 1,585,588 km (0.115 R)
- M12: 1,664,127 km (0.117 R)
- M13: 1,758,972 km (0.098 R)
- M14: 1,849,628 km (0.081 R)
- M15: 1,935,647 km (0.072 R)
- M16: 2,073,726 km (0.101 R)
- M17: 2,173,059 km (0.047 R)
- M18: 2,336,569 km (0.039 R)
Planet 2 - Gas Giant
Semi-Major Axis: 0.6 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 802.3
Radius: 9
Gravity: 9.9 G
Time & Orbit
Eccentricity (e): 0.091
Orbit Range: 0.55 AU - 0.65 AU
Year: 310 Days
Day: 11.3 Hours
Environment
Temp: -151 °C
Axial Tilt: 27.7 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (44)
Outer Limit: 77,658,261 km
- M1: 112,348 km (0.106 R)
- M2: 179,966 km (0.095 R)
- M3: 243,545 km (0.079 R)
- M4: 304,432 km (0.107 R)
- M5: 438,621 km (0.106 R)
- M6: 496,515 km (0.047 R)
- M7: 632,051 km (0.094 R)
- M8: 717,471 km (0.113 R)
- M9: 780,452 km (0.092 R)
- M10: 969,394 km (0.055 R)
- M11: 1,040,004 km (0.106 R)
- M12: 1,173,296 km (0.099 R)
- M13: 1,285,195 km (0.08 R)
- M14: 1,354,010 km (0.098 R)
- M15: 1,548,787 km (0.084 R)
- M16: 1,607,579 km (0.105 R)
- M17: 1,819,409 km (0.047 R)
- M18: 1,913,058 km (0.087 R)
- M19: 2,034,980 km (0.051 R)
- M20: 2,105,141 km (0.086 R)
- M21: 2,165,130 km (0.042 R)
- M22: 2,314,877 km (0.066 R)
- M23: 2,473,750 km (0.104 R)
- M24: 2,548,849 km (0.037 R)
- M25: 2,713,107 km (0.105 R)
- M26: 2,899,057 km (0.089 R)
- M27: 2,959,943 km (0.111 R)
- M28: 3,114,029 km (0.097 R)
- M29: 3,170,278 km (0.08 R)
- M30: 3,264,525 km (0.052 R)
- M31: 3,379,117 km (0.07 R)
- M32: 3,501,338 km (0.1 R)
- M33: 3,592,443 km (0.117 R)
- M34: 3,651,385 km (0.039 R)
- M35: 3,803,675 km (0.063 R)
- M36: 4,039,292 km (0.11 R)
- M37: 4,128,004 km (0.08 R)
- M38: 4,210,582 km (0.045 R)
- M39: 4,272,814 km (0.048 R)
- M40: 4,342,377 km (0.093 R)
- M41: 4,645,762 km (0.046 R)
- M42: 4,745,992 km (0.12 R)
- M43: 4,825,279 km (0.116 R)
- M44: 4,963,358 km (0.093 R)
Planet 3 - Gas Giant
Semi-Major Axis: 0.75 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 712.6
Radius: 12.1
Gravity: 4.87 G
Time & Orbit
Eccentricity (e): 0.113
Orbit Range: 0.67 AU - 0.83 AU
Year: 433 Days
Day: 9.6 Hours
Environment
Temp: -169 °C
Axial Tilt: 43.4 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (39)
Outer Limit: 77,658,261 km
- M1: 151,991 km (0.107 R)
- M2: 232,026 km (0.084 R)
- M3: 329,564 km (0.106 R)
- M4: 433,684 km (0.068 R)
- M5: 510,278 km (0.072 R)
- M6: 603,927 km (0.112 R)
- M7: 692,489 km (0.083 R)
- M8: 790,475 km (0.099 R)
- M9: 898,036 km (0.063 R)
- M10: 1,105,229 km (0.096 R)
- M11: 1,202,617 km (0.041 R)
- M12: 1,318,406 km (0.114 R)
- M13: 1,396,047 km (0.058 R)
- M14: 1,518,418 km (0.096 R)
- M15: 1,616,704 km (0.112 R)
- M16: 1,739,973 km (0.108 R)
- M17: 1,854,864 km (0.104 R)
- M18: 2,020,020 km (0.079 R)
- M19: 2,116,810 km (0.115 R)
- M20: 2,435,603 km (0.036 R)
- M21: 2,604,200 km (0.047 R)
- M22: 2,736,594 km (0.096 R)
- M23: 2,912,072 km (0.035 R)
- M24: 2,994,351 km (0.074 R)
- M25: 3,070,496 km (0.093 R)
- M26: 3,196,607 km (0.114 R)
- M27: 3,295,791 km (0.102 R)
- M28: 3,762,835 km (0.066 R)
- M29: 4,126,956 km (0.082 R)
- M30: 4,313,355 km (0.064 R)
- M31: 4,470,732 km (0.056 R)
- M32: 4,750,929 km (0.076 R)
- M33: 4,864,773 km (0.079 R)
- M34: 4,971,137 km (0.054 R)
- M35: 5,103,232 km (0.066 R)
- M36: 5,228,146 km (0.095 R)
- M37: 5,370,863 km (0.098 R)
- M38: 5,455,535 km (0.114 R)
- M39: 5,651,808 km (0.094 R)
Planet 4 - Gas Giant
Semi-Major Axis: 0.97 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 832.4
Radius: 8
Gravity: 13.01 G
Time & Orbit
Eccentricity (e): 0.071
Orbit Range: 0.9 AU - 1.04 AU
Year: 637 Days
Day: 7.6 Hours
Environment
Temp: -175 °C
Axial Tilt: 46.8 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (59)
Outer Limit: 77,658,261 km
- M1: 100,829 km (0.104 R)
- M2: 186,848 km (0.119 R)
- M3: 281,842 km (0.096 R)
- M4: 335,548 km (0.089 R)
- M5: 401,521 km (0.093 R)
- M6: 512,672 km (0.114 R)
- M7: 644,617 km (0.117 R)
- M8: 709,842 km (0.115 R)
- M9: 777,610 km (0.038 R)
- M10: 942,467 km (0.085 R)
- M11: 1,076,805 km (0.101 R)
- M12: 1,325,736 km (0.07 R)
- M13: 1,572,124 km (0.097 R)
- M14: 1,627,326 km (0.093 R)
- M15: 1,690,306 km (0.084 R)
- M16: 1,920,687 km (0.062 R)
- M17: 2,223,024 km (0.098 R)
- M18: 2,348,238 km (0.102 R)
- M19: 2,451,760 km (0.057 R)
- M20: 2,532,393 km (0.065 R)
- M21: 2,622,151 km (0.082 R)
- M22: 2,696,352 km (0.046 R)
- M23: 2,983,281 km (0.116 R)
- M24: 3,306,562 km (0.114 R)
- M25: 3,422,799 km (0.059 R)
- M26: 3,595,286 km (0.11 R)
- M27: 3,678,013 km (0.069 R)
- M28: 3,742,640 km (0.106 R)
- M29: 3,835,839 km (0.111 R)
- M30: 3,929,786 km (0.119 R)
- M31: 4,034,056 km (0.109 R)
- M32: 4,091,352 km (0.078 R)
- M33: 4,235,714 km (0.077 R)
- M34: 4,332,803 km (0.028 R)
- M35: 4,401,319 km (0.092 R)
- M36: 4,598,938 km (0.038 R)
- M37: 4,951,690 km (0.085 R)
- M38: 5,095,303 km (0.073 R)
- M39: 5,147,064 km (0.101 R)
- M40: 5,250,736 km (0.045 R)
- M41: 5,313,417 km (0.082 R)
- M42: 5,534,523 km (0.043 R)
- M43: 5,705,064 km (0.066 R)
- M44: 5,780,163 km (0.084 R)
- M45: 5,888,023 km (0.109 R)
- M46: 6,007,551 km (0.105 R)
- M47: 6,260,072 km (0.092 R)
- M48: 6,437,795 km (0.12 R)
- M49: 6,684,781 km (0.11 R)
- M50: 6,877,912 km (0.039 R)
- M51: 6,957,947 km (0.099 R)
- M52: 7,118,914 km (0.117 R)
- M53: 7,188,327 km (0.074 R)
- M54: 7,316,084 km (0.11 R)
- M55: 7,421,251 km (0.104 R)
- M56: 7,491,562 km (0.081 R)
- M57: 7,573,991 km (0.101 R)
- M58: 7,644,750 km (0.088 R)
- M59: 7,930,482 km (0.074 R)
Planet 5 - Gas Giant
Semi-Major Axis: 3.49 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 511.9
Radius: 10.5
Gravity: 4.64 G
Time & Orbit
Eccentricity (e): 0.177
Orbit Range: 2.87 AU - 4.11 AU
Year: 4348 Days
Day: 8.3 Hours
Environment
Temp: -216 °C
Axial Tilt: 0.6 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (76)
Outer Limit: 77,658,261 km
- M1: 222,901 km (0.103 R)
- M2: 307,274 km (0.088 R)
- M3: 383,569 km (0.057 R)
- M4: 450,888 km (0.093 R)
- M5: 551,717 km (0.098 R)
- M6: 735,124 km (0.099 R)
- M7: 812,316 km (0.027 R)
- M8: 892,501 km (0.069 R)
- M9: 1,228,049 km (0.112 R)
- M10: 1,335,161 km (0.054 R)
- M11: 1,646,025 km (0.116 R)
- M12: 2,351,679 km (0.101 R)
- M13: 2,469,412 km (0.115 R)
- M14: 2,606,294 km (0.092 R)
- M15: 3,178,955 km (0.067 R)
- M16: 3,365,952 km (0.049 R)
- M17: 3,499,094 km (0.111 R)
- M18: 3,809,959 km (0.084 R)
- M19: 4,211,030 km (0.071 R)
- M20: 4,375,439 km (0.098 R)
- M21: 4,795,509 km (0.069 R)
- M22: 4,967,248 km (0.078 R)
- M23: 5,184,763 km (0.07 R)
- M24: 5,719,575 km (0.107 R)
- M25: 5,810,531 km (0.093 R)
- M26: 6,178,841 km (0.108 R)
- M27: 6,412,962 km (0.098 R)
- M28: 6,602,352 km (0.072 R)
- M29: 6,865,794 km (0.106 R)
- M30: 7,011,054 km (0.06 R)
- M31: 7,132,826 km (0.111 R)
- M32: 7,329,099 km (0.119 R)
- M33: 7,477,500 km (0.105 R)
- M34: 8,208,884 km (0.107 R)
- M35: 8,779,001 km (0.083 R)
- M36: 9,496,174 km (0.118 R)
- M37: 9,658,188 km (0.071 R)
- M38: 9,875,554 km (0.065 R)
- M39: 10,315,072 km (0.08 R)
- M40: 10,398,249 km (0.109 R)
- M41: 10,621,000 km (0.107 R)
- M42: 11,128,137 km (0.061 R)
- M43: 11,932,674 km (0.041 R)
- M44: 12,518,799 km (0.118 R)
- M45: 13,114,348 km (0.114 R)
- M46: 13,780,058 km (0.11 R)
- M47: 14,394,906 km (0.044 R)
- M48: 14,581,005 km (0.106 R)
- M49: 14,705,620 km (0.101 R)
- M50: 15,144,391 km (0.063 R)
- M51: 15,397,062 km (0.098 R)
- M52: 15,587,500 km (0.077 R)
- M53: 16,002,783 km (0.07 R)
- M54: 16,518,896 km (0.117 R)
- M55: 16,779,047 km (0.071 R)
- M56: 17,073,306 km (0.092 R)
- M57: 18,603,991 km (0.064 R)
- M58: 18,705,419 km (0.091 R)
- M59: 18,874,614 km (0.032 R)
- M60: 19,112,624 km (0.068 R)
- M61: 19,385,640 km (0.115 R)
- M62: 19,488,414 km (0.084 R)
- M63: 19,660,152 km (0.104 R)
- M64: 20,875,784 km (0.064 R)
- M65: 21,121,873 km (0.081 R)
- M66: 21,192,334 km (0.034 R)
- M67: 21,475,074 km (0.099 R)
- M68: 21,652,347 km (0.108 R)
- M69: 21,937,032 km (0.109 R)
- M70: 22,079,898 km (0.11 R)
- M71: 22,402,431 km (0.105 R)
- M72: 22,834,918 km (0.064 R)
- M73: 23,197,394 km (0.107 R)
- M74: 23,708,121 km (0.11 R)
- M75: 24,112,035 km (0.113 R)
- M76: 24,777,746 km (0.077 R)
Planet 6 - Gas Giant
Semi-Major Axis: 4.42 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 485
Radius: 10.1
Gravity: 4.75 G
Time & Orbit
Eccentricity (e): 0.189
Orbit Range: 3.58 AU - 5.26 AU
Year: 6197 Days
Day: 13.1 Hours
Environment
Temp: -223 °C
Axial Tilt: 19.9 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (82)
Outer Limit: 77,658,261 km
- M1: 161,267 km (0.11 R)
- M2: 233,522 km (0.072 R)
- M3: 328,068 km (0.073 R)
- M4: 481,855 km (0.089 R)
- M5: 546,481 km (0.033 R)
- M6: 1,002,755 km (0.077 R)
- M7: 1,316,012 km (0.104 R)
- M8: 1,541,905 km (0.067 R)
- M9: 1,608,776 km (0.095 R)
- M10: 1,763,011 km (0.098 R)
- M11: 1,940,284 km (0.11 R)
- M12: 2,312,484 km (0.107 R)
- M13: 2,448,169 km (0.1 R)
- M14: 2,526,858 km (0.118 R)
- M15: 2,646,536 km (0.116 R)
- M16: 2,975,202 km (0.026 R)
- M17: 3,165,790 km (0.096 R)
- M18: 3,739,049 km (0.025 R)
- M19: 4,037,946 km (0.063 R)
- M20: 4,107,958 km (0.082 R)
- M21: 4,634,243 km (0.1 R)
- M22: 5,055,660 km (0.095 R)
- M23: 5,961,774 km (0.032 R)
- M24: 6,392,616 km (0.081 R)
- M25: 6,584,251 km (0.086 R)
- M26: 7,456,107 km (0.112 R)
- M27: 7,861,667 km (0.093 R)
- M28: 8,785,135 km (0.104 R)
- M29: 8,876,390 km (0.107 R)
- M30: 9,430,351 km (0.112 R)
- M31: 9,680,029 km (0.098 R)
- M32: 9,868,822 km (0.106 R)
- M33: 9,932,102 km (0.094 R)
- M34: 10,090,676 km (0.108 R)
- M35: 10,474,693 km (0.041 R)
- M36: 10,571,483 km (0.07 R)
- M37: 10,798,423 km (0.099 R)
- M38: 10,863,648 km (0.119 R)
- M39: 11,290,301 km (0.119 R)
- M40: 11,389,484 km (0.069 R)
- M41: 11,555,538 km (0.064 R)
- M42: 11,856,379 km (0.114 R)
- M43: 12,774,761 km (0.066 R)
- M44: 13,225,050 km (0.049 R)
- M45: 13,539,804 km (0.091 R)
- M46: 13,645,271 km (0.104 R)
- M47: 13,751,036 km (0.112 R)
- M48: 14,355,561 km (0.075 R)
- M49: 15,627,143 km (0.094 R)
- M50: 15,774,796 km (0.119 R)
- M51: 15,959,998 km (0.057 R)
- M52: 16,145,949 km (0.082 R)
- M53: 17,010,475 km (0.112 R)
- M54: 17,238,462 km (0.112 R)
- M55: 17,889,961 km (0.114 R)
- M56: 18,199,329 km (0.096 R)
- M57: 18,315,866 km (0.096 R)
- M58: 19,375,318 km (0.101 R)
- M59: 19,972,513 km (0.091 R)
- M60: 20,697,015 km (0.102 R)
- M61: 20,818,638 km (0.093 R)
- M62: 21,348,364 km (0.045 R)
- M63: 21,841,289 km (0.032 R)
- M64: 23,216,094 km (0.104 R)
- M65: 24,062,818 km (0.112 R)
- M66: 24,233,359 km (0.057 R)
- M67: 25,178,668 km (0.083 R)
- M68: 25,351,902 km (0.111 R)
- M69: 25,655,885 km (0.05 R)
- M70: 26,575,164 km (0.118 R)
- M71: 26,707,409 km (0.111 R)
- M72: 27,460,784 km (0.074 R)
- M73: 27,549,794 km (0.101 R)
- M74: 28,671,629 km (0.066 R)
- M75: 28,761,986 km (0.086 R)
- M76: 28,852,493 km (0.095 R)
- M77: 29,169,790 km (0.104 R)
- M78: 29,260,745 km (0.095 R)
- M79: 29,579,688 km (0.056 R)
- M80: 29,716,719 km (0.081 R)
- M81: 29,899,678 km (0.113 R)
- M82: 30,266,940 km (0.114 R)
Planet 7 - Ice Giant
Semi-Major Axis: 9 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 898.6
Radius: 6.2
Gravity: 23.38 G
Time & Orbit
Eccentricity (e): 0.065
Orbit Range: 8.42 AU - 9.59 AU
Year: 18005 Days
Day: 16.5 Hours
Environment
Temp: -236 °C
Axial Tilt: 44.7 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (98)
Outer Limit: 77,658,261 km
- M1: 842,535 km (0.097 R)
- M2: 1,362,837 km (0.101 R)
- M3: 1,513,930 km (0.104 R)
- M4: 1,576,014 km (0.085 R)
- M5: 2,033,783 km (0.107 R)
- M6: 2,137,006 km (0.092 R)
- M7: 2,242,023 km (0.108 R)
- M8: 2,493,797 km (0.088 R)
- M9: 2,567,399 km (0.112 R)
- M10: 2,641,599 km (0.081 R)
- M11: 4,011,168 km (0.09 R)
- M12: 5,371,611 km (0.063 R)
- M13: 5,419,332 km (0.083 R)
- M14: 6,451,707 km (0.091 R)
- M15: 6,809,097 km (0.059 R)
- M16: 7,068,350 km (0.104 R)
- M17: 7,172,919 km (0.061 R)
- M18: 7,225,428 km (0.112 R)
- M19: 8,301,934 km (0.098 R)
- M20: 8,412,337 km (0.112 R)
- M21: 8,971,684 km (0.092 R)
- M22: 9,198,773 km (0.104 R)
- M23: 9,255,770 km (0.081 R)
- M24: 10,303,105 km (0.103 R)
- M25: 10,660,494 km (0.11 R)
- M26: 11,265,168 km (0.05 R)
- M27: 11,448,725 km (0.063 R)
- M28: 11,633,329 km (0.116 R)
- M29: 11,695,113 km (0.04 R)
- M30: 12,005,379 km (0.062 R)
- M31: 12,067,761 km (0.117 R)
- M32: 12,697,718 km (0.098 R)
- M33: 13,016,660 km (0.088 R)
- M34: 14,717,439 km (0.119 R)
- M35: 16,279,091 km (0.104 R)
- M36: 16,348,205 km (0.087 R)
- M37: 16,417,469 km (0.063 R)
- M38: 17,114,744 km (0.088 R)
- M39: 17,964,161 km (0.103 R)
- M40: 18,465,912 km (0.104 R)
- M41: 21,118,582 km (0.067 R)
- M42: 21,648,158 km (0.106 R)
- M43: 22,412,155 km (0.084 R)
- M44: 22,489,048 km (0.118 R)
- M45: 23,340,559 km (0.092 R)
- M46: 23,966,476 km (0.118 R)
- M47: 25,394,837 km (0.032 R)
- M48: 27,259,724 km (0.082 R)
- M49: 28,333,089 km (0.078 R)
- M50: 30,606,528 km (0.039 R)
- M51: 31,808,098 km (0.086 R)
- M52: 31,981,033 km (0.04 R)
- M53: 34,612,011 km (0.116 R)
- M54: 34,701,021 km (0.087 R)
- M55: 35,057,363 km (0.084 R)
- M56: 35,235,983 km (0.116 R)
- M57: 36,494,700 km (0.089 R)
- M58: 36,857,026 km (0.085 R)
- M59: 37,585,418 km (0.12 R)
- M60: 38,226,594 km (0.108 R)
- M61: 38,410,450 km (0.092 R)
- M62: 39,612,619 km (0.042 R)
- M63: 40,171,666 km (0.045 R)
- M64: 40,358,514 km (0.036 R)
- M65: 40,639,458 km (0.068 R)
- M66: 42,148,602 km (0.068 R)
- M67: 45,513,507 km (0.095 R)
- M68: 49,663,501 km (0.032 R)
- M69: 50,568,419 km (0.12 R)
- M70: 50,871,205 km (0.074 R)
- M71: 51,885,029 km (0.116 R)
- M72: 52,088,632 km (0.076 R)
- M73: 54,966,297 km (0.119 R)
- M74: 55,070,118 km (0.114 R)
- M75: 55,797,911 km (0.063 R)
- M76: 55,902,181 km (0.095 R)
- M77: 56,528,996 km (0.099 R)
- M78: 56,738,583 km (0.12 R)
- M79: 56,843,301 km (0.118 R)
- M80: 57,579,024 km (0.047 R)
- M81: 57,789,807 km (0.081 R)
- M82: 58,106,356 km (0.11 R)
- M83: 58,423,504 km (0.113 R)
- M84: 58,847,314 km (0.06 R)
- M85: 60,767,253 km (0.084 R)
- M86: 62,490,920 km (0.119 R)
- M87: 63,467,495 km (0.107 R)
- M88: 63,794,217 km (0.103 R)
- M89: 64,230,594 km (0.09 R)
- M90: 64,777,524 km (0.046 R)
- M91: 68,425,617 km (0.076 R)
- M92: 69,544,310 km (0.084 R)
- M93: 69,656,509 km (0.118 R)
- M94: 69,993,403 km (0.09 R)
- M95: 70,330,896 km (0.082 R)
- M96: 73,506,859 km (0.1 R)
- M97: 74,308,105 km (0.099 R)
- M98: 76,497,470 km (0.106 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: 223 - 12,940 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.