Star System Generated (Seed: 1768516304)
Star Details
Spectral Class: M0V
Temperature: 3,700 K
Mass: 0.33 sol
Luminosity: 0.02 lux
Habitable Zone (HZ)
Inner Boundary: 0.13 AU
Outer Boundary: 0.19 AU
Physical Limits
Snow Line: 0.68 AU
Max System Radius: 11.5 AU
Planetary System (6 Planets)
Asteroid Belt
Center: 0.47 AU
Composition
Type: Inner (Rocky/Metallic)
A dense region of planetesimals and debris.
Boundary
Planet 1 - Gas Giant
Semi-Major Axis: 0.94 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 788.8
Radius: 8.9
Gravity: 9.96 G
Time & Orbit
Eccentricity (e): 0.059
Orbit Range: 0.88 AU - 1 AU
Year: 579 Days
Day: 6.2 Hours
Environment
Temp: -155 °C
Axial Tilt: 45 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (59)
Outer Limit: 89,389,455 km
- M1: 115,938 km (0.055 R)
- M2: 174,431 km (0.117 R)
- M3: 265,985 km (0.077 R)
- M4: 334,650 km (0.117 R)
- M5: 411,095 km (0.11 R)
- M6: 520,002 km (0.089 R)
- M7: 585,077 km (0.068 R)
- M8: 714,928 km (0.084 R)
- M9: 834,307 km (0.058 R)
- M10: 933,640 km (0.115 R)
- M11: 998,566 km (0.086 R)
- M12: 1,116,150 km (0.097 R)
- M13: 1,238,521 km (0.118 R)
- M14: 1,298,360 km (0.069 R)
- M15: 1,365,380 km (0.099 R)
- M16: 1,458,878 km (0.117 R)
- M17: 1,541,456 km (0.113 R)
- M18: 1,599,800 km (0.091 R)
- M19: 1,826,590 km (0.107 R)
- M20: 1,992,943 km (0.113 R)
- M21: 2,106,787 km (0.052 R)
- M22: 2,186,223 km (0.075 R)
- M23: 2,311,138 km (0.09 R)
- M24: 2,385,787 km (0.072 R)
- M25: 2,483,923 km (0.115 R)
- M26: 2,583,555 km (0.071 R)
- M27: 2,802,567 km (0.101 R)
- M28: 2,882,302 km (0.12 R)
- M29: 3,117,769 km (0.039 R)
- M30: 3,192,119 km (0.106 R)
- M31: 3,275,445 km (0.09 R)
- M32: 3,334,237 km (0.068 R)
- M33: 3,401,856 km (0.051 R)
- M34: 3,478,599 km (0.027 R)
- M35: 3,676,966 km (0.102 R)
- M36: 3,995,310 km (0.098 R)
- M37: 4,239,753 km (0.068 R)
- M38: 4,313,206 km (0.067 R)
- M39: 4,442,608 km (0.118 R)
- M40: 4,753,024 km (0.107 R)
- M41: 4,867,616 km (0.097 R)
- M42: 5,335,408 km (0.066 R)
- M43: 5,544,546 km (0.054 R)
- M44: 5,655,248 km (0.034 R)
- M45: 5,715,835 km (0.109 R)
- M46: 5,878,748 km (0.043 R)
- M47: 6,125,883 km (0.071 R)
- M48: 6,209,060 km (0.066 R)
- M49: 6,334,572 km (0.058 R)
- M50: 6,492,548 km (0.042 R)
- M51: 6,651,869 km (0.027 R)
- M52: 6,748,061 km (0.053 R)
- M53: 6,812,388 km (0.102 R)
- M54: 6,941,940 km (0.058 R)
- M55: 7,093,931 km (0.071 R)
- M56: 7,181,296 km (0.101 R)
- M57: 7,379,214 km (0.112 R)
- M58: 7,467,776 km (0.068 R)
- M59: 7,523,277 km (0.06 R)
Planet 2 - Gas Giant
Semi-Major Axis: 2.11 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 960.8
Radius: 8.2
Gravity: 14.29 G
Time & Orbit
Eccentricity (e): 0.122
Orbit Range: 1.85 AU - 2.37 AU
Year: 1949 Days
Day: 5.7 Hours
Environment
Temp: -193 °C
Axial Tilt: 38.9 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (73)
Outer Limit: 89,389,455 km
- M1: 102,475 km (0.092 R)
- M2: 204,650 km (0.091 R)
- M3: 267,481 km (0.118 R)
- M4: 554,260 km (0.09 R)
- M5: 627,114 km (0.071 R)
- M6: 703,409 km (0.067 R)
- M7: 801,396 km (0.07 R)
- M8: 981,661 km (0.119 R)
- M9: 1,336,807 km (0.098 R)
- M10: 1,460,075 km (0.088 R)
- M11: 1,517,371 km (0.094 R)
- M12: 1,610,720 km (0.092 R)
- M13: 1,669,961 km (0.104 R)
- M14: 1,754,334 km (0.057 R)
- M15: 1,877,304 km (0.109 R)
- M16: 2,093,024 km (0.09 R)
- M17: 2,603,901 km (0.068 R)
- M18: 2,888,136 km (0.105 R)
- M19: 3,019,334 km (0.11 R)
- M20: 3,078,275 km (0.035 R)
- M21: 3,470,671 km (0.112 R)
- M22: 3,579,129 km (0.107 R)
- M23: 3,751,765 km (0.076 R)
- M24: 4,138,027 km (0.062 R)
- M25: 4,319,339 km (0.041 R)
- M26: 4,621,677 km (0.07 R)
- M27: 4,706,947 km (0.117 R)
- M28: 4,965,752 km (0.097 R)
- M29: 5,389,562 km (0.07 R)
- M30: 5,569,678 km (0.076 R)
- M31: 6,633,469 km (0.045 R)
- M32: 6,710,512 km (0.118 R)
- M33: 7,139,259 km (0.1 R)
- M34: 7,456,706 km (0.112 R)
- M35: 7,516,695 km (0.096 R)
- M36: 7,677,662 km (0.025 R)
- M37: 7,819,331 km (0.046 R)
- M38: 8,229,080 km (0.071 R)
- M39: 8,666,803 km (0.111 R)
- M40: 8,814,456 km (0.066 R)
- M41: 8,899,129 km (0.082 R)
- M42: 8,984,100 km (0.075 R)
- M43: 9,348,371 km (0.061 R)
- M44: 9,543,147 km (0.055 R)
- M45: 9,652,055 km (0.089 R)
- M46: 10,113,564 km (0.09 R)
- M47: 10,179,986 km (0.094 R)
- M48: 10,470,056 km (0.026 R)
- M49: 10,582,254 km (0.117 R)
- M50: 10,807,997 km (0.117 R)
- M51: 10,921,393 km (0.077 R)
- M52: 11,241,233 km (0.109 R)
- M53: 11,448,426 km (0.102 R)
- M54: 11,587,253 km (0.108 R)
- M55: 12,266,128 km (0.1 R)
- M56: 12,717,913 km (0.117 R)
- M57: 12,885,762 km (0.079 R)
- M58: 13,054,359 km (0.061 R)
- M59: 13,369,412 km (0.056 R)
- M60: 13,785,145 km (0.07 R)
- M61: 13,932,798 km (0.075 R)
- M62: 14,254,732 km (0.101 R)
- M63: 14,404,181 km (0.12 R)
- M64: 14,855,517 km (0.054 R)
- M65: 14,956,496 km (0.059 R)
- M66: 15,592,586 km (0.053 R)
- M67: 15,695,061 km (0.116 R)
- M68: 15,875,176 km (0.107 R)
- M69: 15,952,519 km (0.079 R)
- M70: 16,030,160 km (0.073 R)
- M71: 17,049,071 km (0.071 R)
- M72: 17,419,924 km (0.032 R)
- M73: 17,873,954 km (0.044 R)
Planet 3 - Gas Giant
Semi-Major Axis: 2.16 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 546.9
Radius: 10
Gravity: 5.47 G
Time & Orbit
Eccentricity (e): 0.182
Orbit Range: 1.77 AU - 2.55 AU
Year: 2018 Days
Day: 9.9 Hours
Environment
Temp: -190 °C
Axial Tilt: 36.9 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (71)
Outer Limit: 89,389,455 km
- M1: 133,292 km (0.108 R)
- M2: 269,276 km (0.109 R)
- M3: 336,296 km (0.12 R)
- M4: 474,225 km (0.073 R)
- M5: 568,771 km (0.098 R)
- M6: 988,393 km (0.078 R)
- M7: 1,077,553 km (0.111 R)
- M8: 1,141,581 km (0.032 R)
- M9: 1,216,380 km (0.082 R)
- M10: 1,283,400 km (0.078 R)
- M11: 1,361,490 km (0.059 R)
- M12: 1,776,624 km (0.118 R)
- M13: 1,897,649 km (0.087 R)
- M14: 2,055,624 km (0.089 R)
- M15: 2,147,926 km (0.118 R)
- M16: 2,218,237 km (0.118 R)
- M17: 2,301,114 km (0.088 R)
- M18: 2,643,095 km (0.067 R)
- M19: 2,794,638 km (0.09 R)
- M20: 2,923,292 km (0.1 R)
- M21: 3,040,726 km (0.054 R)
- M22: 3,172,971 km (0.085 R)
- M23: 3,679,360 km (0.081 R)
- M24: 3,749,820 km (0.091 R)
- M25: 3,891,938 km (0.034 R)
- M26: 4,108,556 km (0.069 R)
- M27: 4,225,841 km (0.114 R)
- M28: 4,373,793 km (0.059 R)
- M29: 4,629,456 km (0.095 R)
- M30: 4,736,269 km (0.092 R)
- M31: 4,890,205 km (0.105 R)
- M32: 5,030,079 km (0.115 R)
- M33: 5,092,760 km (0.081 R)
- M34: 5,409,758 km (0.083 R)
- M35: 5,554,569 km (0.11 R)
- M36: 5,619,345 km (0.098 R)
- M37: 6,230,452 km (0.077 R)
- M38: 6,638,256 km (0.057 R)
- M39: 6,776,036 km (0.078 R)
- M40: 6,862,802 km (0.09 R)
- M41: 6,932,365 km (0.103 R)
- M42: 7,301,573 km (0.076 R)
- M43: 7,390,434 km (0.106 R)
- M44: 7,659,112 km (0.063 R)
- M45: 8,132,739 km (0.115 R)
- M46: 8,206,341 km (0.101 R)
- M47: 8,540,692 km (0.084 R)
- M48: 8,615,641 km (0.038 R)
- M49: 9,146,264 km (0.065 R)
- M50: 9,454,286 km (0.097 R)
- M51: 9,765,749 km (0.076 R)
- M52: 9,981,768 km (0.114 R)
- M53: 10,080,503 km (0.066 R)
- M54: 10,378,651 km (0.09 R)
- M55: 10,740,379 km (0.117 R)
- M56: 11,126,641 km (0.113 R)
- M57: 11,372,879 km (0.086 R)
- M58: 11,538,185 km (0.08 R)
- M59: 11,766,621 km (0.053 R)
- M60: 11,870,890 km (0.094 R)
- M61: 11,933,721 km (0.074 R)
- M62: 12,101,570 km (0.112 R)
- M63: 12,802,586 km (0.045 R)
- M64: 13,039,100 km (0.087 R)
- M65: 13,125,418 km (0.094 R)
- M66: 13,190,343 km (0.066 R)
- M67: 13,691,646 km (0.111 R)
- M68: 13,757,469 km (0.116 R)
- M69: 14,354,813 km (0.098 R)
- M70: 14,892,917 km (0.072 R)
- M71: 15,051,042 km (0.077 R)
Planet 4 - Gas Giant
Semi-Major Axis: 2.89 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 878.6
Radius: 9.8
Gravity: 9.15 G
Time & Orbit
Eccentricity (e): 0.032
Orbit Range: 2.8 AU - 2.98 AU
Year: 3124 Days
Day: 9.7 Hours
Environment
Temp: -200 °C
Axial Tilt: 35 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (77)
Outer Limit: 89,389,455 km
- M1: 132,993 km (0.104 R)
- M2: 252,072 km (0.102 R)
- M3: 463,753 km (0.106 R)
- M4: 712,983 km (0.087 R)
- M5: 842,535 km (0.088 R)
- M6: 992,133 km (0.113 R)
- M7: 1,398,291 km (0.032 R)
- M8: 1,648,569 km (0.066 R)
- M9: 1,823,448 km (0.118 R)
- M10: 1,913,357 km (0.109 R)
- M11: 2,066,395 km (0.114 R)
- M12: 2,128,778 km (0.104 R)
- M13: 2,287,651 km (0.116 R)
- M14: 2,667,779 km (0.093 R)
- M15: 3,339,324 km (0.072 R)
- M16: 3,505,826 km (0.113 R)
- M17: 3,580,775 km (0.096 R)
- M18: 3,732,168 km (0.06 R)
- M19: 3,828,060 km (0.083 R)
- M20: 3,982,894 km (0.095 R)
- M21: 4,061,283 km (0.103 R)
- M22: 4,139,971 km (0.104 R)
- M23: 4,541,642 km (0.085 R)
- M24: 4,767,983 km (0.117 R)
- M25: 5,798,264 km (0.089 R)
- M26: 6,179,290 km (0.115 R)
- M27: 6,499,279 km (0.108 R)
- M28: 6,801,318 km (0.095 R)
- M29: 6,895,115 km (0.046 R)
- M30: 7,036,785 km (0.074 R)
- M31: 7,155,565 km (0.1 R)
- M32: 7,322,816 km (0.093 R)
- M33: 7,395,072 km (0.08 R)
- M34: 7,661,505 km (0.064 R)
- M35: 7,783,727 km (0.077 R)
- M36: 7,906,547 km (0.1 R)
- M37: 8,254,063 km (0.105 R)
- M38: 8,479,955 km (0.119 R)
- M39: 9,248,140 km (0.096 R)
- M40: 9,404,321 km (0.089 R)
- M41: 9,693,194 km (0.029 R)
- M42: 9,798,960 km (0.12 R)
- M43: 10,038,316 km (0.064 R)
- M44: 10,252,690 km (0.093 R)
- M45: 10,987,515 km (0.069 R)
- M46: 11,682,995 km (0.092 R)
- M47: 11,795,643 km (0.087 R)
- M48: 11,965,286 km (0.089 R)
- M49: 12,249,672 km (0.117 R)
- M50: 12,594,046 km (0.089 R)
- M51: 12,796,303 km (0.078 R)
- M52: 12,941,562 km (0.09 R)
- M53: 13,145,763 km (0.115 R)
- M54: 13,409,804 km (0.116 R)
- M55: 13,794,420 km (0.09 R)
- M56: 14,332,822 km (0.104 R)
- M57: 14,513,836 km (0.075 R)
- M58: 14,847,738 km (0.11 R)
- M59: 15,030,996 km (0.118 R)
- M60: 15,708,973 km (0.081 R)
- M61: 16,334,143 km (0.098 R)
- M62: 16,776,504 km (0.081 R)
- M63: 16,903,662 km (0.108 R)
- M64: 17,576,403 km (0.118 R)
- M65: 17,705,506 km (0.107 R)
- M66: 18,421,332 km (0.095 R)
- M67: 18,651,115 km (0.094 R)
- M68: 18,815,822 km (0.104 R)
- M69: 19,047,250 km (0.09 R)
- M70: 19,246,364 km (0.114 R)
- M71: 19,747,218 km (0.083 R)
- M72: 20,489,373 km (0.058 R)
- M73: 20,829,708 km (0.052 R)
- M74: 21,034,957 km (0.116 R)
- M75: 21,309,469 km (0.032 R)
- M76: 22,314,766 km (0.095 R)
- M77: 23,869,238 km (0.098 R)
Planet 5 - Gas Giant
Semi-Major Axis: 3.52 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 211.1
Radius: 8.6
Gravity: 2.85 G
Time & Orbit
Eccentricity (e): 0.062
Orbit Range: 3.3 AU - 3.74 AU
Year: 4199 Days
Day: 7.8 Hours
Environment
Temp: -202 °C
Axial Tilt: 26.3 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (51)
Outer Limit: 89,389,455 km
- M1: 200,760 km (0.106 R)
- M2: 273,465 km (0.111 R)
- M3: 327,171 km (0.116 R)
- M4: 586,124 km (0.101 R)
- M5: 876,045 km (0.064 R)
- M6: 1,012,179 km (0.106 R)
- M7: 1,103,434 km (0.105 R)
- M8: 1,176,438 km (0.099 R)
- M9: 1,294,620 km (0.115 R)
- M10: 1,405,622 km (0.092 R)
- M11: 1,508,246 km (0.077 R)
- M12: 1,721,273 km (0.107 R)
- M13: 1,831,377 km (0.028 R)
- M14: 2,940,047 km (0.116 R)
- M15: 3,389,289 km (0.097 R)
- M16: 3,466,332 km (0.104 R)
- M17: 3,590,798 km (0.099 R)
- M18: 4,234,966 km (0.112 R)
- M19: 4,334,748 km (0.1 R)
- M20: 4,966,949 km (0.073 R)
- M21: 5,231,587 km (0.12 R)
- M22: 5,410,506 km (0.101 R)
- M23: 5,500,714 km (0.09 R)
- M24: 5,555,167 km (0.088 R)
- M25: 5,719,426 km (0.073 R)
- M26: 5,885,180 km (0.076 R)
- M27: 6,034,030 km (0.119 R)
- M28: 6,278,473 km (0.114 R)
- M29: 6,449,613 km (0.113 R)
- M30: 6,507,059 km (0.041 R)
- M31: 6,603,100 km (0.084 R)
- M32: 7,955,615 km (0.105 R)
- M33: 8,203,050 km (0.105 R)
- M34: 9,110,361 km (0.116 R)
- M35: 9,369,315 km (0.064 R)
- M36: 9,784,150 km (0.119 R)
- M37: 9,982,666 km (0.06 R)
- M38: 10,722,427 km (0.109 R)
- M39: 10,858,711 km (0.113 R)
- M40: 11,064,408 km (0.067 R)
- M41: 13,166,707 km (0.076 R)
- M42: 13,483,854 km (0.093 R)
- M43: 13,729,644 km (0.082 R)
- M44: 13,902,579 km (0.05 R)
- M45: 13,976,929 km (0.075 R)
- M46: 14,101,095 km (0.072 R)
- M47: 14,400,590 km (0.046 R)
- M48: 15,800,078 km (0.083 R)
- M49: 15,903,600 km (0.119 R)
- M50: 16,033,152 km (0.037 R)
- M51: 18,073,966 km (0.074 R)
Planet 6 - Ice Giant
Semi-Major Axis: 10.9 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 848.6
Radius: 7.8
Gravity: 13.95 G
Time & Orbit
Eccentricity (e): 0.037
Orbit Range: 10.5 AU - 11.3 AU
Year: 22881 Days
Day: 18 Hours
Environment
Temp: -234 °C
Axial Tilt: 26.9 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (93)
Outer Limit: 89,389,455 km
- M1: 706,850 km (0.093 R)
- M2: 1,248,693 km (0.074 R)
- M3: 1,858,155 km (0.103 R)
- M4: 3,443,893 km (0.108 R)
- M5: 4,674,485 km (0.057 R)
- M6: 4,874,946 km (0.095 R)
- M7: 5,181,023 km (0.068 R)
- M8: 5,284,395 km (0.106 R)
- M9: 5,545,892 km (0.05 R)
- M10: 5,704,915 km (0.101 R)
- M11: 5,973,144 km (0.084 R)
- M12: 6,859,362 km (0.081 R)
- M13: 7,087,199 km (0.09 R)
- M14: 7,492,161 km (0.089 R)
- M15: 7,904,602 km (0.108 R)
- M16: 8,023,682 km (0.112 R)
- M17: 8,628,656 km (0.045 R)
- M18: 8,812,960 km (0.025 R)
- M19: 10,334,221 km (0.087 R)
- M20: 10,859,160 km (0.103 R)
- M21: 11,058,275 km (0.046 R)
- M22: 14,622,743 km (0.118 R)
- M23: 14,695,896 km (0.11 R)
- M24: 14,769,199 km (0.107 R)
- M25: 15,434,461 km (0.115 R)
- M26: 15,808,157 km (0.109 R)
- M27: 16,033,900 km (0.119 R)
- M28: 18,983,820 km (0.113 R)
- M29: 19,223,626 km (0.091 R)
- M30: 21,760,955 km (0.094 R)
- M31: 22,180,128 km (0.081 R)
- M32: 23,281,917 km (0.107 R)
- M33: 27,502,073 km (0.102 R)
- M34: 27,955,055 km (0.094 R)
- M35: 29,236,510 km (0.118 R)
- M36: 29,513,566 km (0.036 R)
- M37: 31,666,578 km (0.11 R)
- M38: 31,856,268 km (0.067 R)
- M39: 32,236,546 km (0.105 R)
- M40: 34,355,301 km (0.115 R)
- M41: 34,647,615 km (0.077 R)
- M42: 34,745,302 km (0.045 R)
- M43: 35,234,936 km (0.112 R)
- M44: 35,529,793 km (0.053 R)
- M45: 35,628,229 km (0.104 R)
- M46: 35,924,283 km (0.07 R)
- M47: 36,023,018 km (0.111 R)
- M48: 38,018,653 km (0.104 R)
- M49: 38,422,119 km (0.038 R)
- M50: 38,928,358 km (0.081 R)
- M51: 39,334,965 km (0.11 R)
- M52: 39,640,893 km (0.11 R)
- M53: 40,049,893 km (0.081 R)
- M54: 41,078,678 km (0.087 R)
- M55: 41,492,615 km (0.037 R)
- M56: 45,814,797 km (0.096 R)
- M57: 47,539,810 km (0.106 R)
- M58: 47,648,418 km (0.092 R)
- M59: 48,192,206 km (0.117 R)
- M60: 49,286,066 km (0.086 R)
- M61: 49,395,871 km (0.12 R)
- M62: 51,386,869 km (0.089 R)
- M63: 51,832,969 km (0.031 R)
- M64: 52,392,166 km (0.074 R)
- M65: 53,855,682 km (0.099 R)
- M66: 53,968,928 km (0.091 R)
- M67: 55,218,668 km (0.079 R)
- M68: 60,429,461 km (0.034 R)
- M69: 60,900,096 km (0.044 R)
- M70: 61,608,592 km (0.079 R)
- M71: 63,271,971 km (0.04 R)
- M72: 64,469,202 km (0.12 R)
- M73: 65,794,789 km (0.078 R)
- M74: 68,105,627 km (0.048 R)
- M75: 69,332,480 km (0.117 R)
- M76: 69,825,255 km (0.079 R)
- M77: 72,556,164 km (0.101 R)
- M78: 74,564,216 km (0.098 R)
- M79: 74,690,327 km (0.076 R)
- M80: 75,448,489 km (0.073 R)
- M81: 75,955,327 km (0.096 R)
- M82: 77,482,721 km (0.058 R)
- M83: 78,763,129 km (0.119 R)
- M84: 79,534,755 km (0.119 R)
- M85: 80,956,085 km (0.055 R)
- M86: 81,215,338 km (0.118 R)
- M87: 82,515,942 km (0.063 R)
- M88: 83,954,624 km (0.103 R)
- M89: 84,085,822 km (0.057 R)
- M90: 84,348,515 km (0.083 R)
- M91: 85,929,765 km (0.104 R)
- M92: 87,255,052 km (0.088 R)
- M93: 87,387,895 km (0.079 R)
Kuiper Belt
Range: 30 - 57 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 384 - 15,716 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.