G1V Star System Generated (Seed: 1768629790)
Star Details
Spectral Class: G6V
Temperature: 5,520 K
Mass: 0.98 sol
Luminosity: 0.93 lux
Habitable Zone (HZ)
Inner Boundary: 0.92 AU
Outer Boundary: 1.32 AU
Physical Limits
Snow Line: 4.63 AU
Max System Radius: 19.8 AU
Planetary System (9 Planets)
Planet 1 - Terrestrial
Semi-Major Axis: 2.25 AU
Status: Outer (Cold)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 1.95
Radius: 1.31
Gravity: 1.14 G
Time & Orbit
Eccentricity (e): 0.051
Orbit Range: 2.14 AU - 2.36 AU
Year: 1245 Days
Day: 37.3 Hours
Environment
Temp: -86 °C
Axial Tilt: 36.5 °
Atmosphere: Thin Nâ‚‚/CHâ‚„
Biome: Ice Cap/Desert
Satellites (1)
Outer Limit: 72,468,202 km
- M1: 541,095 km (0.114 R)
Planet 2 - Terrestrial
Semi-Major Axis: 2.35 AU
Status: Outer (Cold)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 3.94
Radius: 1.73
Gravity: 1.32 G
Time & Orbit
Eccentricity (e): 0.143
Orbit Range: 2.01 AU - 2.69 AU
Year: 1329 Days
Day: 20.9 Hours
Environment
Temp: -75 °C
Axial Tilt: 23.1 °
Atmosphere: Thin Nâ‚‚/CHâ‚„
Biome: Ice Cap/Desert
Planet 3 - Terrestrial
Semi-Major Axis: 3.02 AU
Status: Outer (Cold)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 1.35
Radius: 1.13
Gravity: 1.06 G
Time & Orbit
Eccentricity (e): 0.089
Orbit Range: 2.75 AU - 3.29 AU
Year: 1936 Days
Day: 47.8 Hours
Environment
Temp: -114 °C
Axial Tilt: 104.7 °
Atmosphere: Thin Nâ‚‚/CHâ‚„
Biome: Ice Cap/Desert
Planet 4 - Terrestrial
Semi-Major Axis: 4.03 AU
Status: Outer (Cold)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 3.84
Radius: 1.71
Gravity: 1.31 G
Time & Orbit
Eccentricity (e): 0.022
Orbit Range: 3.94 AU - 4.12 AU
Year: 2985 Days
Day: 15.2 Hours
Environment
Temp: -121 °C
Axial Tilt: 11.7 °
Atmosphere: Thin Nâ‚‚/CHâ‚„
Biome: Ice Cap/Desert
Satellites (1)
Outer Limit: 72,468,202 km
- M1: 1,832,724 km (0.068 R)
Asteroid Belt
Center: 5.08 AU
Composition
Type: Main (Rocky/Icy Mix)
A dense region of planetesimals and debris.
Boundary
Planet 5 - Gas Giant
Semi-Major Axis: 6.12 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 515.3
Radius: 13.5
Gravity: 2.83 G
Time & Orbit
Eccentricity (e): 0.249
Orbit Range: 4.6 AU - 7.64 AU
Year: 5586 Days
Day: 7.5 Hours
Environment
Temp: -156 °C
Axial Tilt: 23.7 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (71)
Outer Limit: 72,468,202 km
- M1: 201,808 km (0.037 R)
- M2: 394,340 km (0.073 R)
- M3: 506,538 km (0.112 R)
- M4: 621,729 km (0.076 R)
- M5: 883,675 km (0.038 R)
- M6: 1,125,574 km (0.109 R)
- M7: 1,284,747 km (0.1 R)
- M8: 1,927,419 km (0.109 R)
- M9: 2,228,709 km (0.108 R)
- M10: 2,431,863 km (0.074 R)
- M11: 2,622,002 km (0.042 R)
- M12: 2,936,756 km (0.086 R)
- M13: 3,777,047 km (0.096 R)
- M14: 3,976,012 km (0.094 R)
- M15: 4,110,650 km (0.088 R)
- M16: 4,407,752 km (0.101 R)
- M17: 4,902,621 km (0.082 R)
- M18: 5,144,521 km (0.104 R)
- M19: 5,267,042 km (0.116 R)
- M20: 5,715,985 km (0.051 R)
- M21: 6,784,862 km (0.087 R)
- M22: 7,136,566 km (0.119 R)
- M23: 7,246,072 km (0.119 R)
- M24: 7,717,455 km (0.117 R)
- M25: 8,027,871 km (0.077 R)
- M26: 8,227,584 km (0.111 R)
- M27: 8,457,964 km (0.089 R)
- M28: 8,690,290 km (0.12 R)
- M29: 8,954,330 km (0.115 R)
- M30: 9,191,293 km (0.091 R)
- M31: 9,490,339 km (0.053 R)
- M32: 10,500,125 km (0.086 R)
- M33: 11,224,179 km (0.085 R)
- M34: 11,640,510 km (0.098 R)
- M35: 11,899,314 km (0.12 R)
- M36: 12,521,641 km (0.064 R)
- M37: 12,786,728 km (0.055 R)
- M38: 12,953,530 km (0.085 R)
- M39: 13,154,440 km (0.079 R)
- M40: 13,322,738 km (0.116 R)
- M41: 13,525,742 km (0.07 R)
- M42: 14,416,747 km (0.095 R)
- M43: 16,327,710 km (0.084 R)
- M44: 16,544,926 km (0.05 R)
- M45: 16,653,983 km (0.051 R)
- M46: 16,836,044 km (0.068 R)
- M47: 17,349,763 km (0.099 R)
- M48: 17,460,465 km (0.091 R)
- M49: 17,645,518 km (0.095 R)
- M50: 17,905,668 km (0.059 R)
- M51: 18,017,568 km (0.116 R)
- M52: 18,129,766 km (0.094 R)
- M53: 18,921,288 km (0.079 R)
- M54: 20,616,232 km (0.116 R)
- M55: 21,165,705 km (0.106 R)
- M56: 21,323,531 km (0.074 R)
- M57: 21,959,023 km (0.081 R)
- M58: 23,045,402 km (0.051 R)
- M59: 23,697,500 km (0.105 R)
- M60: 24,273,003 km (0.06 R)
- M61: 24,521,036 km (0.064 R)
- M62: 24,853,143 km (0.065 R)
- M63: 25,312,259 km (0.108 R)
- M64: 25,437,921 km (0.096 R)
- M65: 25,985,001 km (0.05 R)
- M66: 26,408,363 km (0.037 R)
- M67: 26,578,455 km (0.053 R)
- M68: 26,791,483 km (0.11 R)
- M69: 27,391,071 km (0.105 R)
- M70: 28,124,998 km (0.093 R)
- M71: 29,348,110 km (0.104 R)
Planet 6 - Gas Giant
Semi-Major Axis: 7.66 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 832.3
Radius: 12.7
Gravity: 5.16 G
Time & Orbit
Eccentricity (e): 0.186
Orbit Range: 6.24 AU - 9.08 AU
Year: 7822 Days
Day: 10.9 Hours
Environment
Temp: -161 °C
Axial Tilt: 11.1 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (81)
Outer Limit: 72,468,202 km
- M1: 168,896 km (0.093 R)
- M2: 289,621 km (0.111 R)
- M3: 503,995 km (0.113 R)
- M4: 612,902 km (0.046 R)
- M5: 874,848 km (0.112 R)
- M6: 1,028,785 km (0.086 R)
- M7: 1,230,143 km (0.115 R)
- M8: 1,567,337 km (0.082 R)
- M9: 2,001,470 km (0.095 R)
- M10: 2,351,828 km (0.06 R)
- M11: 2,571,438 km (0.113 R)
- M12: 3,489,520 km (0.106 R)
- M13: 4,713,979 km (0.116 R)
- M14: 4,806,131 km (0.086 R)
- M15: 5,533,476 km (0.094 R)
- M16: 5,761,762 km (0.042 R)
- M17: 5,860,646 km (0.106 R)
- M18: 6,026,550 km (0.073 R)
- M19: 6,261,419 km (0.06 R)
- M20: 7,054,736 km (0.096 R)
- M21: 7,553,196 km (0.094 R)
- M22: 8,887,011 km (0.073 R)
- M23: 9,464,010 km (0.109 R)
- M24: 9,620,041 km (0.106 R)
- M25: 10,053,426 km (0.098 R)
- M26: 10,654,660 km (0.095 R)
- M27: 11,143,994 km (0.088 R)
- M28: 11,433,017 km (0.059 R)
- M29: 11,557,632 km (0.041 R)
- M30: 11,682,547 km (0.06 R)
- M31: 12,060,431 km (0.078 R)
- M32: 12,742,148 km (0.113 R)
- M33: 13,000,953 km (0.04 R)
- M34: 13,305,235 km (0.059 R)
- M35: 13,392,600 km (0.043 R)
- M36: 13,480,115 km (0.025 R)
- M37: 13,611,761 km (0.109 R)
- M38: 14,098,253 km (0.105 R)
- M39: 14,231,993 km (0.064 R)
- M40: 14,725,816 km (0.113 R)
- M41: 15,915,269 km (0.117 R)
- M42: 16,054,544 km (0.088 R)
- M43: 16,851,153 km (0.115 R)
- M44: 17,660,777 km (0.099 R)
- M45: 18,046,141 km (0.113 R)
- M46: 18,142,931 km (0.095 R)
- M47: 19,317,723 km (0.04 R)
- M48: 19,515,940 km (0.03 R)
- M49: 19,964,434 km (0.063 R)
- M50: 20,365,955 km (0.105 R)
- M51: 21,074,899 km (0.09 R)
- M52: 21,381,276 km (0.068 R)
- M53: 21,689,148 km (0.084 R)
- M54: 22,153,649 km (0.104 R)
- M55: 22,257,321 km (0.104 R)
- M56: 22,621,442 km (0.063 R)
- M57: 23,040,017 km (0.065 R)
- M58: 23,250,202 km (0.114 R)
- M59: 24,044,267 km (0.1 R)
- M60: 24,471,519 km (0.077 R)
- M61: 25,062,879 km (0.055 R)
- M62: 25,171,039 km (0.12 R)
- M63: 27,086,789 km (0.106 R)
- M64: 28,090,291 km (0.064 R)
- M65: 28,766,175 km (0.108 R)
- M66: 29,049,214 km (0.079 R)
- M67: 30,133,649 km (0.099 R)
- M68: 33,109,599 km (0.113 R)
- M69: 33,228,081 km (0.077 R)
- M70: 33,406,252 km (0.087 R)
- M71: 33,883,020 km (0.077 R)
- M72: 34,602,287 km (0.109 R)
- M73: 35,568,988 km (0.043 R)
- M74: 36,361,109 km (0.105 R)
- M75: 38,335,651 km (0.076 R)
- M76: 39,273,031 km (0.084 R)
- M77: 39,713,148 km (0.088 R)
- M78: 40,218,191 km (0.064 R)
- M79: 40,661,748 km (0.048 R)
- M80: 41,553,801 km (0.098 R)
- M81: 43,033,174 km (0.11 R)
Planet 7 - Gas Giant
Semi-Major Axis: 9.63 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 338.7
Radius: 12.5
Gravity: 2.17 G
Time & Orbit
Eccentricity (e): 0.158
Orbit Range: 8.11 AU - 11.15 AU
Year: 11026 Days
Day: 12.1 Hours
Environment
Temp: -180 °C
Axial Tilt: 30 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (58)
Outer Limit: 72,468,202 km
- M1: 201,957 km (0.08 R)
- M2: 661,073 km (0.036 R)
- M3: 950,246 km (0.025 R)
- M4: 1,050,177 km (0.073 R)
- M5: 1,154,148 km (0.095 R)
- M6: 1,747,602 km (0.092 R)
- M7: 1,957,787 km (0.097 R)
- M8: 2,243,818 km (0.104 R)
- M9: 2,426,627 km (0.116 R)
- M10: 2,590,736 km (0.101 R)
- M11: 3,284,272 km (0.1 R)
- M12: 3,414,123 km (0.098 R)
- M13: 3,572,248 km (0.045 R)
- M14: 3,786,920 km (0.102 R)
- M15: 5,467,054 km (0.098 R)
- M16: 5,903,581 km (0.056 R)
- M17: 6,286,701 km (0.082 R)
- M18: 6,876,565 km (0.052 R)
- M19: 6,976,646 km (0.066 R)
- M20: 8,643,017 km (0.051 R)
- M21: 9,298,555 km (0.108 R)
- M22: 10,311,931 km (0.062 R)
- M23: 10,541,863 km (0.032 R)
- M24: 11,124,098 km (0.088 R)
- M25: 11,281,175 km (0.043 R)
- M26: 11,399,507 km (0.114 R)
- M27: 12,117,876 km (0.064 R)
- M28: 12,645,957 km (0.071 R)
- M29: 12,768,777 km (0.084 R)
- M30: 13,556,559 km (0.081 R)
- M31: 13,935,341 km (0.04 R)
- M32: 14,832,479 km (0.068 R)
- M33: 16,952,431 km (0.119 R)
- M34: 17,042,788 km (0.112 R)
- M35: 18,093,862 km (0.113 R)
- M36: 20,066,759 km (0.108 R)
- M37: 20,594,840 km (0.119 R)
- M38: 22,802,007 km (0.075 R)
- M39: 23,101,950 km (0.069 R)
- M40: 24,162,001 km (0.072 R)
- M41: 24,570,104 km (0.09 R)
- M42: 24,723,741 km (0.076 R)
- M43: 24,980,451 km (0.115 R)
- M44: 25,186,447 km (0.087 R)
- M45: 26,172,746 km (0.102 R)
- M46: 28,022,524 km (0.03 R)
- M47: 29,532,564 km (0.117 R)
- M48: 29,968,792 km (0.097 R)
- M49: 30,078,148 km (0.114 R)
- M50: 30,847,829 km (0.081 R)
- M51: 31,290,489 km (0.097 R)
- M52: 32,743,683 km (0.118 R)
- M53: 34,333,160 km (0.103 R)
- M54: 34,906,868 km (0.116 R)
- M55: 37,527,823 km (0.05 R)
- M56: 38,415,536 km (0.116 R)
- M57: 39,130,764 km (0.092 R)
- M58: 40,272,046 km (0.12 R)
Planet 8 - Gas Giant
Semi-Major Axis: 10.36 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 503.1
Radius: 14.6
Gravity: 2.36 G
Time & Orbit
Eccentricity (e): 0.096
Orbit Range: 9.37 AU - 11.35 AU
Year: 12303 Days
Day: 7 Hours
Environment
Temp: -171 °C
Axial Tilt: 31 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (80)
Outer Limit: 72,468,202 km
- M1: 189,690 km (0.118 R)
- M2: 377,136 km (0.064 R)
- M3: 478,115 km (0.115 R)
- M4: 1,840,802 km (0.09 R)
- M5: 1,937,442 km (0.077 R)
- M6: 2,036,027 km (0.109 R)
- M7: 2,186,971 km (0.04 R)
- M8: 2,394,314 km (0.116 R)
- M9: 2,608,388 km (0.092 R)
- M10: 3,142,453 km (0.111 R)
- M11: 4,022,836 km (0.059 R)
- M12: 4,376,336 km (0.067 R)
- M13: 5,045,039 km (0.075 R)
- M14: 5,148,112 km (0.114 R)
- M15: 5,321,645 km (0.097 R)
- M16: 5,496,974 km (0.114 R)
- M17: 6,107,931 km (0.116 R)
- M18: 6,627,335 km (0.119 R)
- M19: 7,122,504 km (0.066 R)
- M20: 7,550,953 km (0.041 R)
- M21: 7,788,364 km (0.039 R)
- M22: 8,108,504 km (0.058 R)
- M23: 9,517,716 km (0.052 R)
- M24: 10,119,997 km (0.087 R)
- M25: 10,513,738 km (0.09 R)
- M26: 11,542,673 km (0.052 R)
- M27: 11,770,660 km (0.119 R)
- M28: 13,647,814 km (0.104 R)
- M29: 14,326,838 km (0.074 R)
- M30: 14,769,050 km (0.101 R)
- M31: 15,265,715 km (0.073 R)
- M32: 16,326,663 km (0.063 R)
- M33: 17,047,276 km (0.111 R)
- M34: 17,620,684 km (0.104 R)
- M35: 18,200,526 km (0.11 R)
- M36: 19,216,744 km (0.104 R)
- M37: 20,032,202 km (0.082 R)
- M38: 20,471,571 km (0.08 R)
- M39: 20,581,974 km (0.077 R)
- M40: 20,914,381 km (0.093 R)
- M41: 21,081,182 km (0.095 R)
- M42: 21,304,233 km (0.112 R)
- M43: 21,640,379 km (0.051 R)
- M44: 22,716,586 km (0.051 R)
- M45: 23,002,617 km (0.086 R)
- M46: 23,868,191 km (0.09 R)
- M47: 23,984,279 km (0.089 R)
- M48: 25,809,522 km (0.104 R)
- M49: 26,347,775 km (0.088 R)
- M50: 27,253,142 km (0.047 R)
- M51: 28,168,681 km (0.076 R)
- M52: 28,291,650 km (0.117 R)
- M53: 28,414,620 km (0.114 R)
- M54: 29,592,254 km (0.087 R)
- M55: 30,155,490 km (0.086 R)
- M56: 30,533,075 km (0.099 R)
- M57: 31,420,190 km (0.118 R)
- M58: 31,803,011 km (0.053 R)
- M59: 33,025,226 km (0.112 R)
- M60: 33,740,005 km (0.098 R)
- M61: 34,131,951 km (0.106 R)
- M62: 35,118,549 km (0.112 R)
- M63: 36,047,701 km (0.113 R)
- M64: 36,248,013 km (0.115 R)
- M65: 36,381,604 km (0.056 R)
- M66: 36,716,553 km (0.077 R)
- M67: 36,985,082 km (0.067 R)
- M68: 38,066,225 km (0.056 R)
- M69: 38,747,195 km (0.094 R)
- M70: 39,432,204 km (0.079 R)
- M71: 41,650,890 km (0.118 R)
- M72: 43,341,495 km (0.048 R)
- M73: 43,554,373 km (0.117 R)
- M74: 44,982,733 km (0.11 R)
- M75: 45,270,111 km (0.085 R)
- M76: 45,486,130 km (0.094 R)
- M77: 45,630,343 km (0.119 R)
- M78: 46,426,203 km (0.081 R)
- M79: 47,592,019 km (0.102 R)
- M80: 49,507,022 km (0.113 R)
Planet 9 - Ice Giant
Semi-Major Axis: 12.97 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 797
Radius: 7
Gravity: 16.27 G
Time & Orbit
Eccentricity (e): 0.241
Orbit Range: 9.84 AU - 16.1 AU
Year: 17234 Days
Day: 20.3 Hours
Environment
Temp: -196 °C
Axial Tilt: 49.7 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (93)
Outer Limit: 72,468,202 km
- M1: 159,471 km (0.101 R)
- M2: 307,274 km (0.082 R)
- M3: 390,450 km (0.058 R)
- M4: 644,468 km (0.079 R)
- M5: 920,625 km (0.117 R)
- M6: 1,098,048 km (0.12 R)
- M7: 1,603,540 km (0.102 R)
- M8: 1,880,744 km (0.088 R)
- M9: 2,041,413 km (0.111 R)
- M10: 2,239,929 km (0.065 R)
- M11: 2,983,730 km (0.054 R)
- M12: 3,133,627 km (0.079 R)
- M13: 3,518,991 km (0.071 R)
- M14: 5,250,287 km (0.117 R)
- M15: 5,614,558 km (0.096 R)
- M16: 5,987,206 km (0.026 R)
- M17: 8,019,044 km (0.094 R)
- M18: 9,462,365 km (0.083 R)
- M19: 10,129,272 km (0.118 R)
- M20: 12,159,315 km (0.105 R)
- M21: 12,459,408 km (0.081 R)
- M22: 12,822,632 km (0.064 R)
- M23: 13,808,332 km (0.115 R)
- M24: 14,500,073 km (0.112 R)
- M25: 15,010,351 km (0.082 R)
- M26: 15,332,136 km (0.111 R)
- M27: 15,917,213 km (0.115 R)
- M28: 16,245,431 km (0.062 R)
- M29: 16,575,893 km (0.081 R)
- M30: 16,908,449 km (0.07 R)
- M31: 17,109,209 km (0.083 R)
- M32: 18,329,629 km (0.091 R)
- M33: 18,604,590 km (0.099 R)
- M34: 18,880,897 km (0.097 R)
- M35: 19,858,968 km (0.095 R)
- M36: 20,212,168 km (0.036 R)
- M37: 22,228,598 km (0.026 R)
- M38: 22,816,518 km (0.072 R)
- M39: 23,186,473 km (0.074 R)
- M40: 24,459,252 km (0.098 R)
- M41: 24,534,799 km (0.087 R)
- M42: 24,913,730 km (0.108 R)
- M43: 25,677,727 km (0.054 R)
- M44: 25,754,470 km (0.113 R)
- M45: 27,620,704 km (0.091 R)
- M46: 29,369,503 km (0.028 R)
- M47: 30,095,052 km (0.053 R)
- M48: 31,399,695 km (0.083 R)
- M49: 32,473,210 km (0.105 R)
- M50: 36,453,560 km (0.117 R)
- M51: 37,755,810 km (0.07 R)
- M52: 38,281,048 km (0.068 R)
- M53: 38,896,793 km (0.083 R)
- M54: 39,073,318 km (0.103 R)
- M55: 39,960,134 km (0.098 R)
- M56: 40,138,305 km (0.101 R)
- M57: 40,584,706 km (0.113 R)
- M58: 41,572,799 km (0.111 R)
- M59: 41,663,007 km (0.087 R)
- M60: 42,750,733 km (0.113 R)
- M61: 43,115,453 km (0.116 R)
- M62: 44,031,590 km (0.1 R)
- M63: 44,307,598 km (0.059 R)
- M64: 45,510,664 km (0.089 R)
- M65: 46,443,407 km (0.091 R)
- M66: 48,517,432 km (0.072 R)
- M67: 50,236,760 km (0.077 R)
- M68: 51,103,829 km (0.099 R)
- M69: 51,781,657 km (0.108 R)
- M70: 52,170,462 km (0.109 R)
- M71: 52,365,089 km (0.088 R)
- M72: 52,657,553 km (0.108 R)
- M73: 52,950,615 km (0.104 R)
- M74: 53,146,289 km (0.115 R)
- M75: 55,314,561 km (0.109 R)
- M76: 57,411,025 km (0.104 R)
- M77: 57,612,085 km (0.058 R)
- M78: 58,924,357 km (0.072 R)
- M79: 59,127,062 km (0.098 R)
- M80: 60,450,854 km (0.107 R)
- M81: 61,578,373 km (0.071 R)
- M82: 62,299,584 km (0.11 R)
- M83: 62,712,923 km (0.092 R)
- M84: 63,127,309 km (0.117 R)
- M85: 64,271,284 km (0.102 R)
- M86: 66,157,863 km (0.096 R)
- M87: 67,744,049 km (0.098 R)
- M88: 67,956,478 km (0.06 R)
- M89: 68,488,448 km (0.029 R)
- M90: 69,128,727 km (0.1 R)
- M91: 69,663,839 km (0.115 R)
- M92: 70,845,812 km (0.11 R)
- M93: 71,709,590 km (0.116 R)
Kuiper Belt
Range: 30 - 55 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 423 - 16,645 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.