Star System Generated (Seed: 1768810219)
Star Details
Spectral Class: M3V
Temperature: 3,267 K
Mass: 0.31 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: 11.1 AU
Planetary System (7 Planets)
Planet 1 - Gas Giant
Semi-Major Axis: 0.75 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 193.6
Radius: 12.9
Gravity: 1.16 G
Time & Orbit
Eccentricity (e): 0.241
Orbit Range: 0.57 AU - 0.93 AU
Year: 426 Days
Day: 7 Hours
Environment
Temp: -146 °C
Axial Tilt: 25.5 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (28)
Outer Limit: 67,454,413 km
- M1: 160,519 km (0.11 R)
- M2: 271,520 km (0.068 R)
- M3: 365,617 km (0.085 R)
- M4: 504,145 km (0.065 R)
- M5: 595,400 km (0.091 R)
- M6: 728,691 km (0.117 R)
- M7: 832,213 km (0.069 R)
- M8: 954,584 km (0.096 R)
- M9: 1,049,130 km (0.116 R)
- M10: 1,219,073 km (0.117 R)
- M11: 1,330,075 km (0.117 R)
- M12: 1,503,608 km (0.089 R)
- M13: 1,680,732 km (0.063 R)
- M14: 1,767,798 km (0.118 R)
- M15: 1,890,767 km (0.068 R)
- M16: 2,012,241 km (0.078 R)
- M17: 2,109,629 km (0.052 R)
- M18: 2,217,788 km (0.104 R)
- M19: 2,300,067 km (0.028 R)
- M20: 2,482,128 km (0.098 R)
- M21: 2,659,401 km (0.108 R)
- M22: 2,791,496 km (0.099 R)
- M23: 3,001,382 km (0.099 R)
- M24: 3,185,537 km (0.084 R)
- M25: 3,352,339 km (0.097 R)
- M26: 3,495,504 km (0.094 R)
- M27: 3,629,843 km (0.119 R)
- M28: 3,793,353 km (0.062 R)
Planet 2 - Gas Giant
Semi-Major Axis: 0.88 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 386.9
Radius: 10.7
Gravity: 3.38 G
Time & Orbit
Eccentricity (e): 0.048
Orbit Range: 0.84 AU - 0.92 AU
Year: 542 Days
Day: 12.3 Hours
Environment
Temp: -144 °C
Axial Tilt: 16.3 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (43)
Outer Limit: 67,454,413 km
- M1: 137,780 km (0.065 R)
- M2: 206,445 km (0.08 R)
- M3: 280,047 km (0.116 R)
- M4: 395,686 km (0.094 R)
- M5: 524,640 km (0.096 R)
- M6: 632,201 km (0.054 R)
- M7: 724,203 km (0.111 R)
- M8: 817,104 km (0.059 R)
- M9: 901,477 km (0.089 R)
- M10: 984,653 km (0.112 R)
- M11: 1,070,522 km (0.085 R)
- M12: 1,197,381 km (0.12 R)
- M13: 1,270,086 km (0.113 R)
- M14: 1,420,133 km (0.099 R)
- M15: 1,549,984 km (0.085 R)
- M16: 1,645,876 km (0.092 R)
- M17: 1,716,486 km (0.105 R)
- M18: 1,997,880 km (0.065 R)
- M19: 2,173,956 km (0.059 R)
- M20: 2,251,897 km (0.077 R)
- M21: 2,318,617 km (0.098 R)
- M22: 2,435,304 km (0.111 R)
- M23: 2,516,386 km (0.089 R)
- M24: 2,585,799 km (0.044 R)
- M25: 2,674,960 km (0.07 R)
- M26: 2,752,302 km (0.105 R)
- M27: 2,823,809 km (0.095 R)
- M28: 2,909,080 km (0.06 R)
- M29: 3,069,000 km (0.111 R)
- M30: 3,190,773 km (0.09 R)
- M31: 3,272,902 km (0.102 R)
- M32: 3,376,723 km (0.117 R)
- M33: 3,672,927 km (0.111 R)
- M34: 3,787,968 km (0.049 R)
- M35: 3,867,853 km (0.077 R)
- M36: 3,948,337 km (0.119 R)
- M37: 4,208,039 km (0.1 R)
- M38: 4,465,646 km (0.053 R)
- M39: 4,542,390 km (0.063 R)
- M40: 4,712,782 km (0.106 R)
- M41: 4,814,658 km (0.049 R)
- M42: 5,076,155 km (0.113 R)
- M43: 5,180,574 km (0.04 R)
Planet 3 - Gas Giant
Semi-Major Axis: 1.18 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 124
Radius: 15
Gravity: 0.55 G
Time & Orbit
Eccentricity (e): 0.159
Orbit Range: 0.99 AU - 1.37 AU
Year: 841 Days
Day: 7.8 Hours
Environment
Temp: -163 °C
Axial Tilt: 12.5 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (33)
Outer Limit: 67,454,413 km
- M1: 190,139 km (0.094 R)
- M2: 291,716 km (0.104 R)
- M3: 397,781 km (0.106 R)
- M4: 525,986 km (0.084 R)
- M5: 659,128 km (0.101 R)
- M6: 832,662 km (0.076 R)
- M7: 1,015,171 km (0.116 R)
- M8: 1,137,841 km (0.06 R)
- M9: 1,315,863 km (0.084 R)
- M10: 1,508,695 km (0.12 R)
- M11: 1,706,313 km (0.094 R)
- M12: 1,944,623 km (0.11 R)
- M13: 2,111,724 km (0.055 R)
- M14: 2,559,470 km (0.084 R)
- M15: 2,659,850 km (0.114 R)
- M16: 2,791,795 km (0.115 R)
- M17: 2,895,317 km (0.116 R)
- M18: 3,125,249 km (0.081 R)
- M19: 3,239,392 km (0.118 R)
- M20: 3,380,762 km (0.118 R)
- M21: 3,524,227 km (0.056 R)
- M22: 3,676,517 km (0.117 R)
- M23: 3,803,975 km (0.083 R)
- M24: 3,960,304 km (0.088 R)
- M25: 4,077,290 km (0.039 R)
- M26: 4,202,354 km (0.046 R)
- M27: 4,328,764 km (0.111 R)
- M28: 4,477,913 km (0.094 R)
- M29: 4,614,346 km (0.035 R)
- M30: 4,715,923 km (0.083 R)
- M31: 4,818,099 km (0.111 R)
- M32: 4,950,642 km (0.089 R)
- M33: 5,151,702 km (0.099 R)
Planet 4 - Gas Giant
Semi-Major Axis: 3.02 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 960.5
Radius: 14
Gravity: 4.9 G
Time & Orbit
Eccentricity (e): 0.031
Orbit Range: 2.93 AU - 3.11 AU
Year: 3443 Days
Day: 14.8 Hours
Environment
Temp: -200 °C
Axial Tilt: 26.2 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (72)
Outer Limit: 67,454,413 km
- M1: 200,312 km (0.113 R)
- M2: 432,338 km (0.079 R)
- M3: 539,749 km (0.086 R)
- M4: 690,544 km (0.093 R)
- M5: 845,976 km (0.063 R)
- M6: 977,323 km (0.097 R)
- M7: 1,155,344 km (0.103 R)
- M8: 1,262,456 km (0.057 R)
- M9: 1,401,283 km (0.099 R)
- M10: 1,516,174 km (0.118 R)
- M11: 1,695,093 km (0.03 R)
- M12: 1,865,336 km (0.033 R)
- M13: 1,992,943 km (0.106 R)
- M14: 2,274,187 km (0.117 R)
- M15: 2,463,279 km (0.118 R)
- M16: 2,912,521 km (0.108 R)
- M17: 3,725,286 km (0.061 R)
- M18: 3,908,394 km (0.083 R)
- M19: 4,497,510 km (0.115 R)
- M20: 5,204,959 km (0.09 R)
- M21: 5,318,653 km (0.116 R)
- M22: 5,410,207 km (0.107 R)
- M23: 5,525,397 km (0.087 R)
- M24: 5,664,823 km (0.089 R)
- M25: 6,042,408 km (0.092 R)
- M26: 6,871,778 km (0.045 R)
- M27: 7,198,500 km (0.109 R)
- M28: 7,789,112 km (0.058 R)
- M29: 7,893,382 km (0.12 R)
- M30: 7,998,101 km (0.034 R)
- M31: 8,156,226 km (0.058 R)
- M32: 8,395,283 km (0.078 R)
- M33: 8,744,744 km (0.108 R)
- M34: 8,907,656 km (0.107 R)
- M35: 9,597,302 km (0.071 R)
- M36: 9,962,769 km (0.071 R)
- M37: 10,133,012 km (0.088 R)
- M38: 10,275,579 km (0.073 R)
- M39: 10,591,679 km (0.111 R)
- M40: 10,736,490 km (0.088 R)
- M41: 11,381,256 km (0.118 R)
- M42: 11,529,508 km (0.091 R)
- M43: 11,978,302 km (0.118 R)
- M44: 12,311,157 km (0.115 R)
- M45: 12,555,001 km (0.101 R)
- M46: 13,515,569 km (0.081 R)
- M47: 13,830,473 km (0.059 R)
- M48: 14,275,377 km (0.11 R)
- M49: 14,499,624 km (0.093 R)
- M50: 16,435,869 km (0.1 R)
- M51: 16,738,356 km (0.027 R)
- M52: 17,144,514 km (0.092 R)
- M53: 17,246,540 km (0.077 R)
- M54: 17,348,865 km (0.108 R)
- M55: 17,451,340 km (0.074 R)
- M56: 18,001,261 km (0.067 R)
- M57: 18,696,742 km (0.102 R)
- M58: 18,836,765 km (0.07 R)
- M59: 19,153,464 km (0.107 R)
- M60: 19,649,381 km (0.081 R)
- M61: 19,899,060 km (0.069 R)
- M62: 20,980,653 km (0.088 R)
- M63: 21,345,522 km (0.08 R)
- M64: 21,638,883 km (0.096 R)
- M65: 21,749,286 km (0.092 R)
- M66: 23,313,931 km (0.08 R)
- M67: 23,919,503 km (0.07 R)
- M68: 24,415,420 km (0.12 R)
- M69: 25,223,547 km (0.072 R)
- M70: 25,417,277 km (0.082 R)
- M71: 26,040,651 km (0.074 R)
- M72: 26,197,280 km (0.107 R)
Planet 5 - Gas Giant
Semi-Major Axis: 3.24 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 514.6
Radius: 11.2
Gravity: 4.1 G
Time & Orbit
Eccentricity (e): 0.03
Orbit Range: 3.14 AU - 3.34 AU
Year: 3826 Days
Day: 9.4 Hours
Environment
Temp: -200 °C
Axial Tilt: 2.7 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (76)
Outer Limit: 67,454,413 km
- M1: 165,605 km (0.109 R)
- M2: 458,069 km (0.1 R)
- M3: 571,165 km (0.102 R)
- M4: 695,032 km (0.061 R)
- M5: 776,263 km (0.101 R)
- M6: 949,348 km (0.112 R)
- M7: 1,322,146 km (0.107 R)
- M8: 1,399,488 km (0.114 R)
- M9: 1,545,645 km (0.118 R)
- M10: 1,739,075 km (0.092 R)
- M11: 2,014,635 km (0.057 R)
- M12: 2,242,322 km (0.055 R)
- M13: 2,706,375 km (0.061 R)
- M14: 3,557,288 km (0.108 R)
- M15: 4,021,789 km (0.073 R)
- M16: 4,271,019 km (0.114 R)
- M17: 4,525,336 km (0.092 R)
- M18: 4,644,415 km (0.088 R)
- M19: 5,007,938 km (0.058 R)
- M20: 5,317,905 km (0.095 R)
- M21: 5,655,548 km (0.088 R)
- M22: 5,913,454 km (0.096 R)
- M23: 6,463,226 km (0.09 R)
- M24: 6,800,869 km (0.074 R)
- M25: 7,075,231 km (0.085 R)
- M26: 7,353,334 km (0.046 R)
- M27: 7,446,832 km (0.063 R)
- M28: 7,635,027 km (0.027 R)
- M29: 7,872,438 km (0.027 R)
- M30: 7,968,181 km (0.117 R)
- M31: 8,136,479 km (0.088 R)
- M32: 8,209,034 km (0.045 R)
- M33: 8,305,973 km (0.084 R)
- M34: 8,403,361 km (0.091 R)
- M35: 8,550,266 km (0.049 R)
- M36: 8,772,120 km (0.071 R)
- M37: 8,921,119 km (0.053 R)
- M38: 9,146,264 km (0.11 R)
- M39: 9,246,794 km (0.105 R)
- M40: 9,322,491 km (0.096 R)
- M41: 9,423,768 km (0.1 R)
- M42: 10,378,053 km (0.101 R)
- M43: 10,667,675 km (0.106 R)
- M44: 11,040,173 km (0.111 R)
- M45: 11,201,141 km (0.044 R)
- M46: 11,389,933 km (0.101 R)
- M47: 11,907,691 km (0.114 R)
- M48: 11,990,120 km (0.07 R)
- M49: 12,155,725 km (0.088 R)
- M50: 12,266,427 km (0.072 R)
- M51: 12,768,926 km (0.104 R)
- M52: 13,079,342 km (0.059 R)
- M53: 14,287,644 km (0.116 R)
- M54: 14,375,308 km (0.071 R)
- M55: 15,381,354 km (0.034 R)
- M56: 15,681,597 km (0.114 R)
- M57: 15,771,954 km (0.045 R)
- M58: 16,044,372 km (0.073 R)
- M59: 16,593,845 km (0.042 R)
- M60: 16,840,083 km (0.088 R)
- M61: 16,963,651 km (0.119 R)
- M62: 17,962,964 km (0.046 R)
- M63: 18,089,225 km (0.083 R)
- M64: 18,406,073 km (0.068 R)
- M65: 19,013,441 km (0.062 R)
- M66: 19,206,571 km (0.059 R)
- M67: 19,497,390 km (0.073 R)
- M68: 19,952,915 km (0.086 R)
- M69: 21,173,484 km (0.05 R)
- M70: 21,407,156 km (0.097 R)
- M71: 21,843,383 km (0.1 R)
- M72: 21,978,171 km (0.062 R)
- M73: 22,180,876 km (0.108 R)
- M74: 22,282,603 km (0.057 R)
- M75: 22,520,164 km (0.111 R)
- M76: 22,758,773 km (0.059 R)
Planet 6 - Ice Giant
Semi-Major Axis: 6.39 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 209.1
Radius: 3.6
Gravity: 16.13 G
Time & Orbit
Eccentricity (e): 0.116
Orbit Range: 5.65 AU - 7.13 AU
Year: 10596 Days
Day: 22.2 Hours
Environment
Temp: -227 °C
Axial Tilt: 22.3 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (73)
Outer Limit: 67,454,413 km
- M1: 53,257 km (0.063 R)
- M2: 83,476 km (0.114 R)
- M3: 112,498 km (0.105 R)
- M4: 139,575 km (0.098 R)
- M5: 254,765 km (0.09 R)
- M6: 549,473 km (0.059 R)
- M7: 612,753 km (0.11 R)
- M8: 788,680 km (0.112 R)
- M9: 1,385,426 km (0.057 R)
- M10: 1,688,062 km (0.092 R)
- M11: 1,856,360 km (0.119 R)
- M12: 1,913,656 km (0.116 R)
- M13: 2,188,766 km (0.065 R)
- M14: 2,249,354 km (0.112 R)
- M15: 2,351,529 km (0.047 R)
- M16: 2,624,395 km (0.117 R)
- M17: 3,108,793 km (0.059 R)
- M18: 3,548,910 km (0.07 R)
- M19: 3,644,055 km (0.078 R)
- M20: 3,983,642 km (0.113 R)
- M21: 5,008,238 km (0.109 R)
- M22: 5,357,848 km (0.068 R)
- M23: 5,412,451 km (0.085 R)
- M24: 5,577,009 km (0.104 R)
- M25: 5,911,061 km (0.084 R)
- M26: 6,337,863 km (0.098 R)
- M27: 6,366,586 km (0.109 R)
- M28: 7,401,803 km (0.09 R)
- M29: 8,016,351 km (0.114 R)
- M30: 8,047,468 km (0.073 R)
- M31: 8,172,532 km (0.108 R)
- M32: 8,583,327 km (0.105 R)
- M33: 10,394,359 km (0.087 R)
- M34: 10,564,602 km (0.119 R)
- M35: 11,081,163 km (0.073 R)
- M36: 11,535,342 km (0.113 R)
- M37: 11,995,655 km (0.12 R)
- M38: 12,642,815 km (0.095 R)
- M39: 12,679,168 km (0.097 R)
- M40: 12,934,082 km (0.045 R)
- M41: 13,080,688 km (0.059 R)
- M42: 14,272,086 km (0.094 R)
- M43: 14,842,353 km (0.098 R)
- M44: 15,381,354 km (0.11 R)
- M45: 16,201,749 km (0.043 R)
- M46: 16,517,998 km (0.098 R)
- M47: 16,637,228 km (0.094 R)
- M48: 17,116,540 km (0.06 R)
- M49: 17,237,115 km (0.07 R)
- M50: 17,884,874 km (0.026 R)
- M51: 18,499,273 km (0.047 R)
- M52: 18,540,412 km (0.084 R)
- M53: 18,622,990 km (0.11 R)
- M54: 19,078,964 km (0.04 R)
- M55: 20,639,420 km (0.094 R)
- M56: 20,767,775 km (0.067 R)
- M57: 21,197,420 km (0.1 R)
- M58: 21,803,890 km (0.083 R)
- M59: 22,768,198 km (0.089 R)
- M60: 23,300,168 km (0.095 R)
- M61: 23,478,339 km (0.085 R)
- M62: 24,015,545 km (0.11 R)
- M63: 24,105,602 km (0.119 R)
- M64: 24,150,631 km (0.097 R)
- M65: 24,556,939 km (0.078 R)
- M66: 28,838,730 km (0.082 R)
- M67: 29,510,125 km (0.089 R)
- M68: 30,283,845 km (0.117 R)
- M69: 30,332,464 km (0.1 R)
- M70: 30,868,473 km (0.067 R)
- M71: 31,064,147 km (0.111 R)
- M72: 32,594,833 km (0.06 R)
- M73: 33,444,549 km (0.119 R)
Planet 7 - Ice Giant
Semi-Major Axis: 7.8 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 934.8
Radius: 7.8
Gravity: 15.36 G
Time & Orbit
Eccentricity (e): 0.197
Orbit Range: 6.26 AU - 9.34 AU
Year: 14291 Days
Day: 18.9 Hours
Environment
Temp: -219 °C
Axial Tilt: 0.4 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (91)
Outer Limit: 67,454,413 km
- M1: 145,260 km (0.081 R)
- M2: 302,038 km (0.1 R)
- M3: 464,651 km (0.057 R)
- M4: 615,745 km (0.096 R)
- M5: 827,575 km (0.107 R)
- M6: 1,062,294 km (0.089 R)
- M7: 1,136,794 km (0.05 R)
- M8: 1,536,221 km (0.072 R)
- M9: 1,915,601 km (0.066 R)
- M10: 2,862,106 km (0.057 R)
- M11: 2,967,274 km (0.114 R)
- M12: 3,038,183 km (0.104 R)
- M13: 3,400,958 km (0.099 R)
- M14: 3,777,645 km (0.096 R)
- M15: 4,985,947 km (0.077 R)
- M16: 5,198,077 km (0.1 R)
- M17: 5,675,444 km (0.075 R)
- M18: 5,763,856 km (0.11 R)
- M19: 6,166,873 km (0.112 R)
- M20: 6,625,390 km (0.089 R)
- M21: 6,718,440 km (0.075 R)
- M22: 6,858,913 km (0.095 R)
- M23: 7,000,283 km (0.115 R)
- M24: 8,115,834 km (0.116 R)
- M25: 9,026,885 km (0.076 R)
- M26: 9,337,749 km (0.102 R)
- M27: 9,547,037 km (0.106 R)
- M28: 10,076,763 km (0.101 R)
- M29: 10,237,581 km (0.072 R)
- M30: 10,507,605 km (0.077 R)
- M31: 11,554,640 km (0.095 R)
- M32: 11,666,689 km (0.061 R)
- M33: 11,892,133 km (0.113 R)
- M34: 13,984,559 km (0.034 R)
- M35: 14,889,326 km (0.11 R)
- M36: 16,502,291 km (0.062 R)
- M37: 16,945,848 km (0.079 R)
- M38: 17,974,633 km (0.054 R)
- M39: 19,488,713 km (0.056 R)
- M40: 20,294,746 km (0.068 R)
- M41: 20,633,735 km (0.081 R)
- M42: 21,248,882 km (0.032 R)
- M43: 21,800,599 km (0.061 R)
- M44: 22,426,965 km (0.119 R)
- M45: 22,637,150 km (0.085 R)
- M46: 22,918,244 km (0.118 R)
- M47: 23,697,500 km (0.051 R)
- M48: 24,991,072 km (0.064 R)
- M49: 26,160,180 km (0.118 R)
- M50: 27,272,290 km (0.057 R)
- M51: 28,779,040 km (0.12 R)
- M52: 28,855,036 km (0.074 R)
- M53: 31,558,568 km (0.117 R)
- M54: 32,424,740 km (0.114 R)
- M55: 33,139,369 km (0.116 R)
- M56: 33,538,646 km (0.118 R)
- M57: 34,100,236 km (0.093 R)
- M58: 36,871,836 km (0.07 R)
- M59: 37,036,992 km (0.085 R)
- M60: 39,545,748 km (0.117 R)
- M61: 41,077,032 km (0.028 R)
- M62: 42,540,997 km (0.106 R)
- M63: 42,714,381 km (0.117 R)
- M64: 43,235,879 km (0.082 R)
- M65: 44,109,680 km (0.097 R)
- M66: 44,372,972 km (0.077 R)
- M67: 44,989,316 km (0.11 R)
- M68: 45,519,939 km (0.083 R)
- M69: 46,855,399 km (0.107 R)
- M70: 47,034,468 km (0.066 R)
- M71: 47,124,077 km (0.076 R)
- M72: 47,752,837 km (0.115 R)
- M73: 48,023,160 km (0.065 R)
- M74: 48,474,946 km (0.072 R)
- M75: 49,109,690 km (0.101 R)
- M76: 51,491,288 km (0.093 R)
- M77: 51,583,739 km (0.065 R)
- M78: 51,768,493 km (0.104 R)
- M79: 54,098,031 km (0.114 R)
- M80: 54,662,164 km (0.073 R)
- M81: 54,850,658 km (0.081 R)
- M82: 55,985,956 km (0.116 R)
- M83: 56,175,945 km (0.089 R)
- M84: 56,366,234 km (0.115 R)
- M85: 57,607,746 km (0.073 R)
- M86: 58,376,231 km (0.108 R)
- M87: 58,858,385 km (0.109 R)
- M88: 61,288,303 km (0.117 R)
- M89: 63,850,017 km (0.111 R)
- M90: 64,844,693 km (0.107 R)
- M91: 65,443,833 km (0.105 R)
Kuiper Belt
Range: 30 - 53 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 550 - 14,741 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.