Star System Generated (Seed: 1768597814)
Star Details
Spectral Class: M6V
Temperature: 2,833 K
Mass: 0.29 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: 10.8 AU
Planetary System (8 Planets)
Planet 1 - Gas Giant
Semi-Major Axis: 0.53 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 549
Radius: 11.8
Gravity: 3.94 G
Time & Orbit
Eccentricity (e): 0.051
Orbit Range: 0.5 AU - 0.56 AU
Year: 262 Days
Day: 9 Hours
Environment
Temp: -152 °C
Axial Tilt: 45.2 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (32)
Outer Limit: 48,685,455 km
- M1: 148,551 km (0.068 R)
- M2: 257,308 km (0.118 R)
- M3: 355,295 km (0.091 R)
- M4: 484,697 km (0.117 R)
- M5: 590,912 km (0.104 R)
- M6: 688,599 km (0.083 R)
- M7: 795,711 km (0.113 R)
- M8: 918,980 km (0.085 R)
- M9: 1,010,833 km (0.031 R)
- M10: 1,091,765 km (0.09 R)
- M11: 1,249,441 km (0.101 R)
- M12: 1,344,735 km (0.067 R)
- M13: 1,418,786 km (0.087 R)
- M14: 1,494,483 km (0.052 R)
- M15: 1,625,082 km (0.092 R)
- M16: 1,704,518 km (0.118 R)
- M17: 1,793,978 km (0.099 R)
- M18: 1,964,370 km (0.105 R)
- M19: 2,062,955 km (0.09 R)
- M20: 2,158,548 km (0.05 R)
- M21: 2,288,548 km (0.097 R)
- M22: 2,387,881 km (0.045 R)
- M23: 2,610,333 km (0.059 R)
- M24: 2,739,287 km (0.112 R)
- M25: 2,814,534 km (0.113 R)
- M26: 2,967,423 km (0.075 R)
- M27: 3,076,031 km (0.09 R)
- M28: 3,410,083 km (0.096 R)
- M29: 3,513,156 km (0.049 R)
- M30: 3,628,347 km (0.114 R)
- M31: 3,705,838 km (0.08 R)
- M32: 3,811,903 km (0.095 R)
Planet 2 - Gas Giant
Semi-Major Axis: 0.54 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 225.6
Radius: 14.3
Gravity: 1.1 G
Time & Orbit
Eccentricity (e): 0.218
Orbit Range: 0.42 AU - 0.66 AU
Year: 269 Days
Day: 10.6 Hours
Environment
Temp: -154 °C
Axial Tilt: 109.5 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (24)
Outer Limit: 48,685,455 km
- M1: 196,123 km (0.104 R)
- M2: 286,779 km (0.09 R)
- M3: 472,131 km (0.092 R)
- M4: 603,029 km (0.055 R)
- M5: 698,024 km (0.069 R)
- M6: 804,388 km (0.12 R)
- M7: 906,264 km (0.09 R)
- M8: 1,078,451 km (0.117 R)
- M9: 1,180,926 km (0.107 R)
- M10: 1,289,982 km (0.089 R)
- M11: 1,390,213 km (0.044 R)
- M12: 1,539,063 km (0.102 R)
- M13: 1,645,876 km (0.114 R)
- M14: 1,748,500 km (0.079 R)
- M15: 1,857,108 km (0.095 R)
- M16: 1,946,268 km (0.08 R)
- M17: 2,136,706 km (0.061 R)
- M18: 2,253,243 km (0.101 R)
- M19: 2,387,582 km (0.073 R)
- M20: 2,481,230 km (0.077 R)
- M21: 2,576,225 km (0.101 R)
- M22: 2,712,957 km (0.076 R)
- M23: 2,827,400 km (0.107 R)
- M24: 2,935,260 km (0.09 R)
Planet 3 - Gas Giant
Semi-Major Axis: 0.96 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 232
Radius: 9.3
Gravity: 2.68 G
Time & Orbit
Eccentricity (e): 0.2
Orbit Range: 0.77 AU - 1.15 AU
Year: 638 Days
Day: 10.4 Hours
Environment
Temp: -176 °C
Axial Tilt: 41.5 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (34)
Outer Limit: 48,685,455 km
- M1: 116,088 km (0.111 R)
- M2: 200,162 km (0.062 R)
- M3: 303,534 km (0.114 R)
- M4: 409,749 km (0.059 R)
- M5: 554,709 km (0.116 R)
- M6: 687,552 km (0.119 R)
- M7: 951,891 km (0.092 R)
- M8: 1,047,185 km (0.072 R)
- M9: 1,154,896 km (0.104 R)
- M10: 1,238,222 km (0.066 R)
- M11: 1,314,068 km (0.117 R)
- M12: 1,455,737 km (0.12 R)
- M13: 1,551,480 km (0.033 R)
- M14: 1,659,639 km (0.049 R)
- M15: 1,770,491 km (0.12 R)
- M16: 1,845,739 km (0.075 R)
- M17: 2,180,838 km (0.12 R)
- M18: 2,296,926 km (0.093 R)
- M19: 2,361,552 km (0.062 R)
- M20: 2,750,207 km (0.102 R)
- M21: 2,952,164 km (0.099 R)
- M22: 3,119,864 km (0.088 R)
- M23: 3,237,896 km (0.103 R)
- M24: 3,478,300 km (0.05 R)
- M25: 3,559,831 km (0.079 R)
- M26: 3,752,363 km (0.112 R)
- M27: 4,040,638 km (0.08 R)
- M28: 4,321,583 km (0.1 R)
- M29: 4,675,981 km (0.119 R)
- M30: 4,735,969 km (0.038 R)
- M31: 4,796,257 km (0.102 R)
- M32: 4,925,211 km (0.078 R)
- M33: 5,086,028 km (0.092 R)
- M34: 5,217,525 km (0.098 R)
Planet 4 - Gas Giant
Semi-Major Axis: 1.51 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 607.8
Radius: 9.9
Gravity: 6.2 G
Time & Orbit
Eccentricity (e): 0.021
Orbit Range: 1.48 AU - 1.54 AU
Year: 1259 Days
Day: 11.2 Hours
Environment
Temp: -199 °C
Axial Tilt: 32.7 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (58)
Outer Limit: 48,685,455 km
- M1: 142,118 km (0.108 R)
- M2: 218,114 km (0.102 R)
- M3: 283,039 km (0.086 R)
- M4: 348,862 km (0.085 R)
- M5: 463,454 km (0.118 R)
- M6: 534,962 km (0.066 R)
- M7: 690,843 km (0.102 R)
- M8: 911,201 km (0.12 R)
- M9: 1,026,391 km (0.104 R)
- M10: 1,169,855 km (0.103 R)
- M11: 1,287,888 km (0.069 R)
- M12: 1,401,882 km (0.088 R)
- M13: 1,947,465 km (0.084 R)
- M14: 2,060,262 km (0.04 R)
- M15: 2,175,303 km (0.091 R)
- M16: 2,523,267 km (0.094 R)
- M17: 2,953,361 km (0.111 R)
- M18: 3,204,835 km (0.071 R)
- M19: 3,406,493 km (0.12 R)
- M20: 3,474,560 km (0.084 R)
- M21: 3,716,759 km (0.111 R)
- M22: 3,834,193 km (0.113 R)
- M23: 4,072,503 km (0.103 R)
- M24: 4,157,026 km (0.107 R)
- M25: 4,563,782 km (0.093 R)
- M26: 4,906,062 km (0.08 R)
- M27: 5,165,016 km (0.105 R)
- M28: 5,362,336 km (0.119 R)
- M29: 5,913,903 km (0.113 R)
- M30: 6,175,849 km (0.118 R)
- M31: 6,245,262 km (0.069 R)
- M32: 7,056,532 km (0.11 R)
- M33: 7,143,897 km (0.115 R)
- M34: 7,275,543 km (0.068 R)
- M35: 7,690,527 km (0.102 R)
- M36: 7,795,395 km (0.058 R)
- M37: 8,265,881 km (0.092 R)
- M38: 8,373,292 km (0.093 R)
- M39: 8,434,926 km (0.096 R)
- M40: 8,512,268 km (0.1 R)
- M41: 8,636,435 km (0.033 R)
- M42: 8,729,933 km (0.094 R)
- M43: 8,933,536 km (0.107 R)
- M44: 9,012,374 km (0.116 R)
- M45: 9,506,047 km (0.072 R)
- M46: 9,602,538 km (0.113 R)
- M47: 9,667,164 km (0.085 R)
- M48: 10,041,159 km (0.075 R)
- M49: 10,155,900 km (0.12 R)
- M50: 10,254,635 km (0.056 R)
- M51: 10,386,879 km (0.098 R)
- M52: 10,636,109 km (0.086 R)
- M53: 10,820,264 km (0.098 R)
- M54: 10,937,998 km (0.11 R)
- M55: 11,157,757 km (0.071 R)
- M56: 11,242,579 km (0.108 R)
- M57: 11,430,175 km (0.087 R)
- M58: 11,567,207 km (0.09 R)
Planet 5 - Gas Giant
Semi-Major Axis: 1.53 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 811.5
Radius: 14.8
Gravity: 3.7 G
Time & Orbit
Eccentricity (e): 0.01
Orbit Range: 1.51 AU - 1.55 AU
Year: 1284 Days
Day: 6.4 Hours
Environment
Temp: -199 °C
Axial Tilt: 22.8 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (54)
Outer Limit: 48,685,455 km
- M1: 198,666 km (0.047 R)
- M2: 322,084 km (0.109 R)
- M3: 424,708 km (0.092 R)
- M4: 533,316 km (0.073 R)
- M5: 629,358 km (0.037 R)
- M6: 773,421 km (0.085 R)
- M7: 1,021,305 km (0.038 R)
- M8: 1,163,722 km (0.057 R)
- M9: 1,425,817 km (0.106 R)
- M10: 1,764,806 km (0.1 R)
- M11: 1,929,364 km (0.113 R)
- M12: 2,068,939 km (0.086 R)
- M13: 2,212,104 km (0.104 R)
- M14: 2,595,673 km (0.119 R)
- M15: 2,717,296 km (0.046 R)
- M16: 3,270,658 km (0.111 R)
- M17: 3,475,159 km (0.11 R)
- M18: 3,585,113 km (0.093 R)
- M19: 3,986,035 km (0.057 R)
- M20: 4,114,241 km (0.088 R)
- M21: 4,230,927 km (0.057 R)
- M22: 4,574,404 km (0.116 R)
- M23: 4,803,887 km (0.026 R)
- M24: 4,913,243 km (0.107 R)
- M25: 5,078,848 km (0.114 R)
- M26: 5,486,801 km (0.108 R)
- M27: 5,832,522 km (0.032 R)
- M28: 6,140,993 km (0.12 R)
- M29: 6,289,842 km (0.068 R)
- M30: 6,820,167 km (0.088 R)
- M31: 6,958,844 km (0.098 R)
- M32: 7,083,010 km (0.098 R)
- M33: 7,192,217 km (0.1 R)
- M34: 7,412,275 km (0.094 R)
- M35: 7,666,592 km (0.049 R)
- M36: 7,827,110 km (0.054 R)
- M37: 8,102,520 km (0.053 R)
- M38: 8,233,119 km (0.113 R)
- M39: 8,348,160 km (0.052 R)
- M40: 8,596,193 km (0.092 R)
- M41: 8,947,748 km (0.09 R)
- M42: 9,049,026 km (0.077 R)
- M43: 9,252,927 km (0.064 R)
- M44: 9,406,714 km (0.105 R)
- M45: 9,682,423 km (0.113 R)
- M46: 10,065,693 km (0.104 R)
- M47: 10,436,396 km (0.118 R)
- M48: 10,614,567 km (0.108 R)
- M49: 11,100,461 km (0.094 R)
- M50: 11,648,887 km (0.073 R)
- M51: 11,852,340 km (0.068 R)
- M52: 11,982,341 km (0.084 R)
- M53: 12,488,281 km (0.089 R)
- M54: 12,677,522 km (0.095 R)
Asteroid Belt
Center: 2.27 AU
Composition
Type: Outer System (Icy)
A dense region of planetesimals and debris.
Boundary
Planet 6 - Gas Giant
Semi-Major Axis: 3.01 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 170.7
Radius: 10.1
Gravity: 1.67 G
Time & Orbit
Eccentricity (e): 0.22
Orbit Range: 2.35 AU - 3.67 AU
Year: 3542 Days
Day: 7.4 Hours
Environment
Temp: -205 °C
Axial Tilt: 50 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (57)
Outer Limit: 48,685,455 km
- M1: 140,622 km (0.088 R)
- M2: 215,421 km (0.094 R)
- M3: 313,557 km (0.037 R)
- M4: 397,033 km (0.12 R)
- M5: 578,046 km (0.116 R)
- M6: 642,373 km (0.098 R)
- M7: 732,581 km (0.07 R)
- M8: 803,341 km (0.119 R)
- M9: 1,012,927 km (0.057 R)
- M10: 1,175,241 km (0.028 R)
- M11: 1,250,189 km (0.08 R)
- M12: 1,465,012 km (0.081 R)
- M13: 1,713,195 km (0.098 R)
- M14: 1,952,701 km (0.113 R)
- M15: 2,019,870 km (0.058 R)
- M16: 2,203,128 km (0.093 R)
- M17: 3,146,791 km (0.059 R)
- M18: 3,226,228 km (0.116 R)
- M19: 3,306,263 km (0.117 R)
- M20: 3,536,793 km (0.089 R)
- M21: 4,042,434 km (0.092 R)
- M22: 4,114,390 km (0.119 R)
- M23: 4,645,911 km (0.083 R)
- M24: 4,858,490 km (0.111 R)
- M25: 5,183,417 km (0.11 R)
- M26: 5,451,646 km (0.088 R)
- M27: 5,515,374 km (0.078 R)
- M28: 5,870,669 km (0.038 R)
- M29: 6,084,145 km (0.048 R)
- M30: 6,434,504 km (0.116 R)
- M31: 6,501,972 km (0.048 R)
- M32: 6,603,549 km (0.116 R)
- M33: 6,774,240 km (0.109 R)
- M34: 7,524,474 km (0.084 R)
- M35: 7,595,682 km (0.074 R)
- M36: 7,810,505 km (0.091 R)
- M37: 8,027,272 km (0.104 R)
- M38: 8,393,039 km (0.057 R)
- M39: 8,503,891 km (0.072 R)
- M40: 8,577,942 km (0.083 R)
- M41: 9,159,878 km (0.077 R)
- M42: 9,715,933 km (0.05 R)
- M43: 9,793,425 km (0.11 R)
- M44: 10,600,206 km (0.074 R)
- M45: 10,680,091 km (0.05 R)
- M46: 11,001,427 km (0.075 R)
- M47: 11,881,063 km (0.066 R)
- M48: 12,297,992 km (0.086 R)
- M49: 12,825,773 km (0.103 R)
- M50: 13,146,062 km (0.056 R)
- M51: 13,317,950 km (0.05 R)
- M52: 13,577,204 km (0.114 R)
- M53: 13,663,970 km (0.1 R)
- M54: 13,947,309 km (0.089 R)
- M55: 14,254,583 km (0.114 R)
- M56: 14,386,977 km (0.087 R)
- M57: 14,786,553 km (0.046 R)
Planet 7 - Gas Giant
Semi-Major Axis: 4.02 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 60
Radius: 8.3
Gravity: 0.87 G
Time & Orbit
Eccentricity (e): 0.03
Orbit Range: 3.9 AU - 4.14 AU
Year: 5467 Days
Day: 6.5 Hours
Environment
Temp: -217 °C
Axial Tilt: 122 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (60)
Outer Limit: 48,685,455 km
- M1: 109,805 km (0.119 R)
- M2: 169,345 km (0.113 R)
- M3: 233,672 km (0.109 R)
- M4: 316,100 km (0.058 R)
- M5: 399,277 km (0.062 R)
- M6: 583,880 km (0.104 R)
- M7: 907,610 km (0.092 R)
- M8: 1,301,202 km (0.116 R)
- M9: 1,414,597 km (0.092 R)
- M10: 1,571,077 km (0.076 R)
- M11: 2,063,553 km (0.111 R)
- M12: 2,332,680 km (0.054 R)
- M13: 2,541,967 km (0.034 R)
- M14: 2,806,007 km (0.066 R)
- M15: 2,892,026 km (0.116 R)
- M16: 3,155,019 km (0.107 R)
- M17: 3,308,955 km (0.116 R)
- M18: 3,478,450 km (0.114 R)
- M19: 4,101,076 km (0.103 R)
- M20: 4,198,913 km (0.087 R)
- M21: 4,411,043 km (0.107 R)
- M22: 4,655,785 km (0.054 R)
- M23: 4,949,446 km (0.09 R)
- M24: 5,098,595 km (0.105 R)
- M25: 5,173,693 km (0.05 R)
- M26: 5,694,293 km (0.104 R)
- M27: 5,913,604 km (0.062 R)
- M28: 6,344,296 km (0.101 R)
- M29: 6,425,079 km (0.065 R)
- M30: 6,555,229 km (0.076 R)
- M31: 6,834,678 km (0.111 R)
- M32: 7,017,487 km (0.088 R)
- M33: 7,134,771 km (0.104 R)
- M34: 7,303,368 km (0.085 R)
- M35: 7,490,365 km (0.057 R)
- M36: 7,747,973 km (0.038 R)
- M37: 7,851,794 km (0.08 R)
- M38: 8,183,752 km (0.065 R)
- M39: 8,555,951 km (0.093 R)
- M40: 8,609,657 km (0.076 R)
- M41: 8,699,266 km (0.117 R)
- M42: 8,861,430 km (0.044 R)
- M43: 9,115,597 km (0.088 R)
- M44: 9,280,304 km (0.084 R)
- M45: 9,538,510 km (0.118 R)
- M46: 9,780,260 km (0.085 R)
- M47: 9,948,857 km (0.099 R)
- M48: 10,024,105 km (0.081 R)
- M49: 10,118,501 km (0.118 R)
- M50: 10,289,042 km (0.105 R)
- M51: 10,498,779 km (0.073 R)
- M52: 11,489,715 km (0.113 R)
- M53: 11,906,345 km (0.077 R)
- M54: 12,126,553 km (0.097 R)
- M55: 12,429,189 km (0.112 R)
- M56: 13,206,650 km (0.077 R)
- M57: 13,268,583 km (0.034 R)
- M58: 13,497,019 km (0.041 R)
- M59: 13,663,970 km (0.096 R)
- M60: 13,936,538 km (0.082 R)
Planet 8 - Ice Giant
Semi-Major Axis: 6.04 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 708.1
Radius: 7.5
Gravity: 12.59 G
Time & Orbit
Eccentricity (e): 0.163
Orbit Range: 5.06 AU - 7.02 AU
Year: 10068 Days
Day: 24.2 Hours
Environment
Temp: -218 °C
Axial Tilt: 8.6 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (82)
Outer Limit: 48,685,455 km
- M1: 230,680 km (0.067 R)
- M2: 620,382 km (0.111 R)
- M3: 1,131,558 km (0.118 R)
- M4: 2,113,220 km (0.112 R)
- M5: 2,189,365 km (0.103 R)
- M6: 2,292,438 km (0.037 R)
- M7: 2,693,360 km (0.08 R)
- M8: 2,804,062 km (0.088 R)
- M9: 3,116,124 km (0.109 R)
- M10: 5,005,246 km (0.114 R)
- M11: 5,175,937 km (0.12 R)
- M12: 5,593,614 km (0.035 R)
- M13: 6,986,520 km (0.107 R)
- M14: 7,370,089 km (0.072 R)
- M15: 7,486,476 km (0.044 R)
- M16: 7,800,033 km (0.075 R)
- M17: 7,879,021 km (0.08 R)
- M18: 7,958,308 km (0.056 R)
- M19: 8,157,721 km (0.046 R)
- M20: 8,807,126 km (0.102 R)
- M21: 10,371,321 km (0.064 R)
- M22: 10,589,136 km (0.062 R)
- M23: 10,720,632 km (0.099 R)
- M24: 10,985,271 km (0.109 R)
- M25: 11,073,833 km (0.12 R)
- M26: 11,565,860 km (0.084 R)
- M27: 12,340,179 km (0.115 R)
- M28: 12,478,557 km (0.085 R)
- M29: 14,372,316 km (0.097 R)
- M30: 14,615,263 km (0.102 R)
- M31: 14,761,719 km (0.118 R)
- M32: 15,302,815 km (0.109 R)
- M33: 15,401,998 km (0.083 R)
- M34: 15,550,998 km (0.037 R)
- M35: 15,600,814 km (0.053 R)
- M36: 18,419,387 km (0.108 R)
- M37: 21,390,850 km (0.094 R)
- M38: 22,903,135 km (0.051 R)
- M39: 23,471,906 km (0.116 R)
- M40: 24,102,910 km (0.088 R)
- M41: 25,852,307 km (0.106 R)
- M42: 25,970,340 km (0.111 R)
- M43: 27,100,851 km (0.026 R)
- M44: 27,401,094 km (0.049 R)
- M45: 27,461,232 km (0.099 R)
- M46: 27,642,096 km (0.068 R)
- M47: 27,823,259 km (0.116 R)
- M48: 28,551,801 km (0.072 R)
- M49: 28,673,873 km (0.068 R)
- M50: 28,979,800 km (0.116 R)
- M51: 29,780,149 km (0.088 R)
- M52: 29,904,016 km (0.087 R)
- M53: 29,965,949 km (0.078 R)
- M54: 30,712,742 km (0.067 R)
- M55: 31,907,580 km (0.088 R)
- M56: 32,989,622 km (0.105 R)
- M57: 33,374,387 km (0.098 R)
- M58: 33,438,714 km (0.083 R)
- M59: 33,889,752 km (0.08 R)
- M60: 35,058,710 km (0.069 R)
- M61: 35,320,356 km (0.117 R)
- M62: 35,451,404 km (0.099 R)
- M63: 35,977,091 km (0.088 R)
- M64: 36,307,104 km (0.108 R)
- M65: 37,236,107 km (0.083 R)
- M66: 37,703,600 km (0.051 R)
- M67: 37,904,660 km (0.106 R)
- M68: 37,971,680 km (0.083 R)
- M69: 38,173,038 km (0.088 R)
- M70: 38,982,363 km (0.042 R)
- M71: 39,524,954 km (0.106 R)
- M72: 40,275,188 km (0.041 R)
- M73: 40,961,243 km (0.113 R)
- M74: 41,098,873 km (0.094 R)
- M75: 41,236,803 km (0.087 R)
- M76: 41,305,767 km (0.078 R)
- M77: 41,374,732 km (0.099 R)
- M78: 41,582,075 km (0.08 R)
- M79: 43,252,634 km (0.069 R)
- M80: 43,392,807 km (0.101 R)
- M81: 46,515,364 km (0.074 R)
- M82: 48,539,722 km (0.073 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: 481 - 18,961 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.