Star System Generated (Seed: 1767336394)
Star Details
Spectral Class: K7V
Temperature: 4,021 K
Mass: 0.66 sol
Luminosity: 0.23 lux
Habitable Zone (HZ)
Inner Boundary: 0.46 AU
Outer Boundary: 0.66 AU
Physical Limits
Snow Line: 2.3 AU
Max System Radius: 16.2 AU
Planetary System (10 Planets)
Planet 1 - Terrestrial
Semi-Major Axis: 0.77 AU
Status: Outer (Cold)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 3.09
Radius: 1.57
Gravity: 1.25 G
Time & Orbit
Eccentricity (e): 0.102
Orbit Range: 0.69 AU - 0.85 AU
Year: 304 Days
Day: 33.2 Hours
Environment
Temp: -47 °C
Axial Tilt: 16.8 °
Atmosphere: Thin Nâ‚‚/CHâ‚„
Biome: Ice Cap/Desert
Planet 2 - Terrestrial
Semi-Major Axis: 1.5 AU
Status: Outer (Cold)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 3.55
Radius: 1.66
Gravity: 1.29 G
Time & Orbit
Eccentricity (e): 0.089
Orbit Range: 1.37 AU - 1.63 AU
Year: 826 Days
Day: 17 Hours
Environment
Temp: -109 °C
Axial Tilt: 8 °
Atmosphere: Thin Nâ‚‚/CHâ‚„
Biome: Ice Cap/Desert
Planet 3 - Terrestrial
Semi-Major Axis: 1.6 AU
Status: Outer (Cold)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 2.64
Radius: 1.47
Gravity: 1.22 G
Time & Orbit
Eccentricity (e): 0.169
Orbit Range: 1.33 AU - 1.87 AU
Year: 910 Days
Day: 27.4 Hours
Environment
Temp: -110 °C
Axial Tilt: 22.5 °
Atmosphere: Thin Nâ‚‚/CHâ‚„
Biome: Ice Cap/Desert
Planet 4 - Terrestrial
Semi-Major Axis: 1.85 AU
Status: Outer (Cold)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 2.24
Radius: 1.38
Gravity: 1.18 G
Time & Orbit
Eccentricity (e): 0.147
Orbit Range: 1.58 AU - 2.12 AU
Year: 1131 Days
Day: 17.1 Hours
Environment
Temp: -119 °C
Axial Tilt: 9.9 °
Atmosphere: Thin Nâ‚‚/CHâ‚„
Biome: Ice Cap/Desert
Satellites (2)
Outer Limit: 45,450,122 km
- M1: 834,756 km (0.088 R)
- M2: 1,476,980 km (0.041 R)
Planet 5 - Terrestrial
Semi-Major Axis: 1.98 AU
Status: Outer (Cold)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 1.38
Radius: 1.14
Gravity: 1.06 G
Time & Orbit
Eccentricity (e): 0.03
Orbit Range: 1.92 AU - 2.04 AU
Year: 1253 Days
Day: 41.7 Hours
Environment
Temp: -125 °C
Axial Tilt: 29.6 °
Atmosphere: Thin Nâ‚‚/CHâ‚„
Biome: Ice Cap/Desert
Planet 6 - Gas Giant
Semi-Major Axis: 4.68 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 287.2
Radius: 11.1
Gravity: 2.33 G
Time & Orbit
Eccentricity (e): 0.122
Orbit Range: 4.11 AU - 5.25 AU
Year: 4552 Days
Day: 6.1 Hours
Environment
Temp: -176 °C
Axial Tilt: 17.1 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (63)
Outer Limit: 45,450,122 km
- M1: 138,677 km (0.095 R)
- M2: 247,584 km (0.093 R)
- M3: 319,541 km (0.097 R)
- M4: 395,387 km (0.097 R)
- M5: 755,619 km (0.111 R)
- M6: 939,175 km (0.117 R)
- M7: 1,231,041 km (0.06 R)
- M8: 1,314,666 km (0.089 R)
- M9: 1,500,467 km (0.093 R)
- M10: 1,577,360 km (0.111 R)
- M11: 1,748,650 km (0.096 R)
- M12: 1,968,110 km (0.095 R)
- M13: 2,153,162 km (0.108 R)
- M14: 2,633,371 km (0.093 R)
- M15: 2,727,020 km (0.08 R)
- M16: 2,869,886 km (0.096 R)
- M17: 3,795,896 km (0.094 R)
- M18: 4,027,623 km (0.12 R)
- M19: 4,154,333 km (0.1 R)
- M20: 4,300,939 km (0.093 R)
- M21: 4,903,968 km (0.084 R)
- M22: 5,235,327 km (0.111 R)
- M23: 5,393,751 km (0.092 R)
- M24: 5,715,536 km (0.116 R)
- M25: 6,084,893 km (0.075 R)
- M26: 6,230,751 km (0.084 R)
- M27: 6,483,422 km (0.1 R)
- M28: 6,632,422 km (0.103 R)
- M29: 7,195,658 km (0.042 R)
- M30: 7,416,464 km (0.118 R)
- M31: 7,661,954 km (0.117 R)
- M32: 8,275,754 km (0.107 R)
- M33: 8,905,412 km (0.118 R)
- M34: 9,430,051 km (0.069 R)
- M35: 9,502,307 km (0.032 R)
- M36: 9,574,862 km (0.119 R)
- M37: 10,384,486 km (0.117 R)
- M38: 11,165,087 km (0.094 R)
- M39: 11,446,481 km (0.09 R)
- M40: 11,626,896 km (0.067 R)
- M41: 11,964,389 km (0.104 R)
- M42: 12,862,425 km (0.072 R)
- M43: 12,969,537 km (0.101 R)
- M44: 13,076,948 km (0.115 R)
- M45: 13,238,514 km (0.078 R)
- M46: 13,427,905 km (0.05 R)
- M47: 13,727,400 km (0.062 R)
- M48: 14,416,148 km (0.093 R)
- M49: 14,919,096 km (0.113 R)
- M50: 15,399,306 km (0.101 R)
- M51: 15,770,009 km (0.066 R)
- M52: 15,913,473 km (0.09 R)
- M53: 16,201,449 km (0.062 R)
- M54: 16,404,155 km (0.052 R)
- M55: 16,782,787 km (0.044 R)
- M56: 17,341,236 km (0.072 R)
- M57: 18,115,554 km (0.114 R)
- M58: 18,355,958 km (0.062 R)
- M59: 19,144,937 km (0.116 R)
- M60: 20,038,036 km (0.095 R)
- M61: 20,286,818 km (0.083 R)
- M62: 20,661,860 km (0.083 R)
- M63: 21,070,710 km (0.091 R)
Planet 7 - Gas Giant
Semi-Major Axis: 5.47 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 286.2
Radius: 11.5
Gravity: 2.16 G
Time & Orbit
Eccentricity (e): 0.177
Orbit Range: 4.5 AU - 6.44 AU
Year: 5752 Days
Day: 9.6 Hours
Environment
Temp: -186 °C
Axial Tilt: 21 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (77)
Outer Limit: 45,450,122 km
- M1: 171,439 km (0.066 R)
- M2: 340,186 km (0.108 R)
- M3: 443,707 km (0.078 R)
- M4: 589,565 km (0.077 R)
- M5: 742,903 km (0.119 R)
- M6: 887,415 km (0.119 R)
- M7: 1,231,938 km (0.096 R)
- M8: 1,378,844 km (0.089 R)
- M9: 1,560,156 km (0.083 R)
- M10: 1,993,392 km (0.1 R)
- M11: 2,248,456 km (0.091 R)
- M12: 2,330,436 km (0.11 R)
- M13: 2,685,581 km (0.075 R)
- M14: 2,860,910 km (0.115 R)
- M15: 2,950,070 km (0.112 R)
- M16: 3,186,135 km (0.104 R)
- M17: 3,260,037 km (0.111 R)
- M18: 3,447,483 km (0.052 R)
- M19: 3,677,116 km (0.114 R)
- M20: 4,050,961 km (0.118 R)
- M21: 4,171,537 km (0.043 R)
- M22: 4,334,299 km (0.083 R)
- M23: 5,201,368 km (0.106 R)
- M24: 5,398,987 km (0.085 R)
- M25: 5,643,729 km (0.092 R)
- M26: 6,167,322 km (0.093 R)
- M27: 6,329,935 km (0.116 R)
- M28: 6,493,744 km (0.098 R)
- M29: 6,706,622 km (0.105 R)
- M30: 8,620,577 km (0.085 R)
- M31: 9,196,679 km (0.106 R)
- M32: 9,623,481 km (0.115 R)
- M33: 9,920,732 km (0.08 R)
- M34: 10,056,866 km (0.119 R)
- M35: 10,330,930 km (0.114 R)
- M36: 10,413,657 km (0.037 R)
- M37: 11,027,009 km (0.087 R)
- M38: 11,111,531 km (0.1 R)
- M39: 11,196,353 km (0.061 R)
- M40: 11,395,019 km (0.102 R)
- M41: 11,537,586 km (0.085 R)
- M42: 11,623,455 km (0.085 R)
- M43: 11,767,069 km (0.114 R)
- M44: 11,969,026 km (0.107 R)
- M45: 12,172,180 km (0.102 R)
- M46: 12,317,889 km (0.042 R)
- M47: 13,444,959 km (0.034 R)
- M48: 13,535,316 km (0.051 R)
- M49: 14,759,775 km (0.098 R)
- M50: 15,009,005 km (0.036 R)
- M51: 15,165,484 km (0.084 R)
- M52: 15,290,997 km (0.091 R)
- M53: 16,339,827 km (0.075 R)
- M54: 16,726,987 km (0.051 R)
- M55: 17,117,138 km (0.069 R)
- M56: 17,609,165 km (0.072 R)
- M57: 17,708,050 km (0.088 R)
- M58: 17,840,294 km (0.117 R)
- M59: 18,472,943 km (0.113 R)
- M60: 18,573,473 km (0.104 R)
- M61: 18,876,259 km (0.053 R)
- M62: 19,112,923 km (0.096 R)
- M63: 19,589,093 km (0.11 R)
- M64: 20,069,302 km (0.086 R)
- M65: 20,276,196 km (0.088 R)
- M66: 20,553,251 km (0.076 R)
- M67: 20,761,940 km (0.119 R)
- M68: 21,111,252 km (0.116 R)
- M69: 21,216,269 km (0.064 R)
- M70: 21,568,123 km (0.117 R)
- M71: 22,420,382 km (0.038 R)
- M72: 22,706,862 km (0.116 R)
- M73: 22,814,573 km (0.12 R)
- M74: 23,102,848 km (0.092 R)
- M75: 23,719,341 km (0.032 R)
- M76: 24,157,663 km (0.026 R)
- M77: 24,341,070 km (0.048 R)
Planet 8 - Gas Giant
Semi-Major Axis: 6.81 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 402.2
Radius: 8.9
Gravity: 5.08 G
Time & Orbit
Eccentricity (e): 0.238
Orbit Range: 5.19 AU - 8.43 AU
Year: 7990 Days
Day: 11.1 Hours
Environment
Temp: -191 °C
Axial Tilt: 17.5 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (81)
Outer Limit: 45,450,122 km
- M1: 122,820 km (0.069 R)
- M2: 417,827 km (0.099 R)
- M3: 1,316,461 km (0.113 R)
- M4: 1,471,744 km (0.066 R)
- M5: 1,669,811 km (0.096 R)
- M6: 1,725,462 km (0.109 R)
- M7: 1,857,557 km (0.111 R)
- M8: 1,973,645 km (0.082 R)
- M9: 2,336,120 km (0.111 R)
- M10: 2,568,147 km (0.091 R)
- M11: 2,807,503 km (0.12 R)
- M12: 3,008,862 km (0.042 R)
- M13: 3,425,941 km (0.059 R)
- M14: 3,617,127 km (0.118 R)
- M15: 4,085,368 km (0.117 R)
- M16: 4,442,758 km (0.064 R)
- M17: 4,520,698 km (0.097 R)
- M18: 4,598,938 km (0.055 R)
- M19: 4,677,776 km (0.09 R)
- M20: 4,863,427 km (0.06 R)
- M21: 5,297,111 km (0.116 R)
- M22: 5,490,691 km (0.029 R)
- M23: 5,630,415 km (0.12 R)
- M24: 5,714,788 km (0.108 R)
- M25: 5,999,174 km (0.08 R)
- M26: 6,056,769 km (0.105 R)
- M27: 6,346,690 km (0.118 R)
- M28: 6,434,653 km (0.104 R)
- M29: 6,522,916 km (0.097 R)
- M30: 6,850,236 km (0.08 R)
- M31: 7,366,498 km (0.098 R)
- M32: 7,428,133 km (0.059 R)
- M33: 7,676,166 km (0.051 R)
- M34: 7,738,548 km (0.091 R)
- M35: 8,244,189 km (0.073 R)
- M36: 8,436,572 km (0.082 R)
- M37: 8,760,451 km (0.081 R)
- M38: 9,187,703 km (0.119 R)
- M39: 9,689,155 km (0.077 R)
- M40: 10,614,119 km (0.067 R)
- M41: 10,999,034 km (0.076 R)
- M42: 11,317,378 km (0.08 R)
- M43: 11,782,478 km (0.115 R)
- M44: 12,327,014 km (0.093 R)
- M45: 12,731,527 km (0.095 R)
- M46: 13,177,777 km (0.093 R)
- M47: 13,365,223 km (0.053 R)
- M48: 13,971,095 km (0.11 R)
- M49: 14,741,075 km (0.083 R)
- M50: 15,841,966 km (0.098 R)
- M51: 16,321,876 km (0.051 R)
- M52: 16,806,573 km (0.065 R)
- M53: 16,928,495 km (0.113 R)
- M54: 19,045,754 km (0.118 R)
- M55: 20,113,733 km (0.075 R)
- M56: 20,416,369 km (0.081 R)
- M57: 20,807,568 km (0.114 R)
- M58: 20,938,466 km (0.116 R)
- M59: 23,025,506 km (0.097 R)
- M60: 23,432,711 km (0.077 R)
- M61: 23,614,323 km (0.109 R)
- M62: 23,750,906 km (0.113 R)
- M63: 23,979,192 km (0.059 R)
- M64: 24,116,523 km (0.084 R)
- M65: 24,391,933 km (0.069 R)
- M66: 24,853,293 km (0.097 R)
- M67: 24,945,894 km (0.073 R)
- M68: 25,085,020 km (0.089 R)
- M69: 25,224,445 km (0.119 R)
- M70: 25,503,894 km (0.095 R)
- M71: 25,597,392 km (0.049 R)
- M72: 26,869,573 km (0.107 R)
- M73: 27,585,249 km (0.097 R)
- M74: 27,777,183 km (0.1 R)
- M75: 28,258,888 km (0.085 R)
- M76: 30,411,003 km (0.105 R)
- M77: 31,556,923 km (0.103 R)
- M78: 32,109,837 km (0.082 R)
- M79: 32,716,755 km (0.075 R)
- M80: 33,429,739 km (0.1 R)
- M81: 34,353,805 km (0.055 R)
Planet 9 - Gas Giant
Semi-Major Axis: 6.86 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 314.2
Radius: 9.6
Gravity: 3.41 G
Time & Orbit
Eccentricity (e): 0.04
Orbit Range: 6.59 AU - 7.13 AU
Year: 8078 Days
Day: 10 Hours
Environment
Temp: -196 °C
Axial Tilt: 49.6 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (86)
Outer Limit: 45,450,122 km
- M1: 134,189 km (0.088 R)
- M2: 238,160 km (0.105 R)
- M3: 394,340 km (0.117 R)
- M4: 465,848 km (0.087 R)
- M5: 588,817 km (0.084 R)
- M6: 685,757 km (0.104 R)
- M7: 1,054,665 km (0.058 R)
- M8: 1,159,982 km (0.075 R)
- M9: 1,348,924 km (0.073 R)
- M10: 1,430,754 km (0.055 R)
- M11: 1,633,908 km (0.097 R)
- M12: 1,721,572 km (0.098 R)
- M13: 1,846,786 km (0.073 R)
- M14: 2,049,940 km (0.098 R)
- M15: 2,202,230 km (0.091 R)
- M16: 2,417,950 km (0.1 R)
- M17: 2,477,939 km (0.066 R)
- M18: 2,558,872 km (0.105 R)
- M19: 2,848,942 km (0.106 R)
- M20: 2,976,549 km (0.112 R)
- M21: 3,041,026 km (0.106 R)
- M22: 3,171,624 km (0.119 R)
- M23: 3,528,715 km (0.092 R)
- M24: 3,781,685 km (0.066 R)
- M25: 4,160,317 km (0.071 R)
- M26: 4,551,366 km (0.117 R)
- M27: 4,675,831 km (0.067 R)
- M28: 4,954,083 km (0.03 R)
- M29: 5,263,751 km (0.106 R)
- M30: 5,579,701 km (0.112 R)
- M31: 5,793,776 km (0.064 R)
- M32: 6,010,543 km (0.093 R)
- M33: 6,230,153 km (0.068 R)
- M34: 6,368,681 km (0.097 R)
- M35: 6,592,629 km (0.041 R)
- M36: 6,790,547 km (0.03 R)
- M37: 6,961,836 km (0.081 R)
- M38: 7,105,749 km (0.118 R)
- M39: 7,250,560 km (0.117 R)
- M40: 7,631,735 km (0.096 R)
- M41: 7,989,424 km (0.111 R)
- M42: 8,876,390 km (0.097 R)
- M43: 9,442,618 km (0.107 R)
- M44: 10,676,202 km (0.079 R)
- M45: 10,975,697 km (0.065 R)
- M46: 11,176,906 km (0.065 R)
- M47: 11,447,229 km (0.118 R)
- M48: 12,166,795 km (0.075 R)
- M49: 12,654,633 km (0.08 R)
- M50: 13,149,054 km (0.071 R)
- M51: 13,505,995 km (0.112 R)
- M52: 13,721,715 km (0.103 R)
- M53: 13,902,280 km (0.101 R)
- M54: 14,595,965 km (0.103 R)
- M55: 14,669,717 km (0.068 R)
- M56: 16,054,843 km (0.062 R)
- M57: 16,589,805 km (0.089 R)
- M58: 16,705,145 km (0.116 R)
- M59: 17,325,229 km (0.103 R)
- M60: 17,481,409 km (0.099 R)
- M61: 18,348,777 km (0.055 R)
- M62: 19,351,233 km (0.081 R)
- M63: 20,002,282 km (0.097 R)
- M64: 21,033,760 km (0.111 R)
- M65: 22,167,113 km (0.061 R)
- M66: 22,933,802 km (0.111 R)
- M67: 23,019,522 km (0.116 R)
- M68: 23,277,279 km (0.089 R)
- M69: 23,449,616 km (0.043 R)
- M70: 24,186,984 km (0.093 R)
- M71: 24,405,397 km (0.079 R)
- M72: 24,712,072 km (0.046 R)
- M73: 25,329,463 km (0.11 R)
- M74: 25,418,174 km (0.09 R)
- M75: 26,849,975 km (0.048 R)
- M76: 27,076,018 km (0.098 R)
- M77: 27,257,330 km (0.109 R)
- M78: 27,348,136 km (0.068 R)
- M79: 27,439,092 km (0.08 R)
- M80: 27,803,662 km (0.117 R)
- M81: 27,986,620 km (0.109 R)
- M82: 28,170,027 km (0.086 R)
- M83: 28,814,794 km (0.117 R)
- M84: 30,212,936 km (0.087 R)
- M85: 30,778,416 km (0.118 R)
- M86: 32,063,312 km (0.06 R)
Planet 10 - Ice Giant
Semi-Major Axis: 11.17 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 207.3
Radius: 5
Gravity: 8.29 G
Time & Orbit
Eccentricity (e): 0.187
Orbit Range: 9.08 AU - 13.26 AU
Year: 16784 Days
Day: 18.3 Hours
Environment
Temp: -210 °C
Axial Tilt: 38.9 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (69)
Outer Limit: 45,450,122 km
- M1: 154,086 km (0.114 R)
- M2: 334,202 km (0.053 R)
- M3: 939,026 km (0.084 R)
- M4: 1,454,690 km (0.105 R)
- M5: 1,540,708 km (0.084 R)
- M6: 2,288,548 km (0.049 R)
- M7: 2,751,853 km (0.103 R)
- M8: 3,159,657 km (0.102 R)
- M9: 3,557,288 km (0.099 R)
- M10: 3,910,488 km (0.11 R)
- M11: 4,213,424 km (0.098 R)
- M12: 4,305,876 km (0.098 R)
- M13: 4,430,042 km (0.117 R)
- M14: 4,492,574 km (0.067 R)
- M15: 5,432,048 km (0.111 R)
- M16: 5,667,665 km (0.102 R)
- M17: 5,803,949 km (0.103 R)
- M18: 5,838,057 km (0.092 R)
- M19: 5,941,130 km (0.075 R)
- M20: 6,571,984 km (0.118 R)
- M21: 6,931,617 km (0.078 R)
- M22: 7,934,073 km (0.112 R)
- M23: 8,010,218 km (0.09 R)
- M24: 8,048,216 km (0.098 R)
- M25: 8,432,832 km (0.111 R)
- M26: 9,906,820 km (0.116 R)
- M27: 10,443,427 km (0.092 R)
- M28: 11,372,729 km (0.106 R)
- M29: 11,890,637 km (0.109 R)
- M30: 12,240,247 km (0.087 R)
- M31: 14,967,865 km (0.059 R)
- M32: 15,203,332 km (0.038 R)
- M33: 15,250,605 km (0.066 R)
- M34: 15,534,991 km (0.079 R)
- M35: 15,725,728 km (0.119 R)
- M36: 15,869,193 km (0.038 R)
- M37: 15,965,085 km (0.099 R)
- M38: 16,109,297 km (0.078 R)
- M39: 17,081,683 km (0.069 R)
- M40: 17,574,907 km (0.089 R)
- M41: 17,923,022 km (0.087 R)
- M42: 18,323,645 km (0.114 R)
- M43: 18,575,568 km (0.094 R)
- M44: 20,110,741 km (0.085 R)
- M45: 20,736,060 km (0.081 R)
- M46: 21,262,196 km (0.062 R)
- M47: 21,367,812 km (0.078 R)
- M48: 23,300,766 km (0.061 R)
- M49: 26,416,590 km (0.1 R)
- M50: 28,022,972 km (0.096 R)
- M51: 28,662,503 km (0.085 R)
- M52: 28,954,817 km (0.104 R)
- M53: 29,483,646 km (0.1 R)
- M54: 30,134,097 km (0.109 R)
- M55: 30,550,578 km (0.119 R)
- M56: 30,789,336 km (0.118 R)
- M57: 30,849,175 km (0.117 R)
- M58: 32,660,955 km (0.093 R)
- M59: 34,197,026 km (0.1 R)
- M60: 35,254,982 km (0.11 R)
- M61: 37,594,394 km (0.118 R)
- M62: 38,299,598 km (0.086 R)
- M63: 38,428,252 km (0.089 R)
- M64: 38,492,579 km (0.091 R)
- M65: 39,073,767 km (0.102 R)
- M66: 42,088,912 km (0.119 R)
- M67: 43,423,026 km (0.115 R)
- M68: 43,826,043 km (0.113 R)
- M69: 44,095,319 km (0.107 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: 365 - 12,867 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.