G0V Star System Generated (Seed: 1768785587)
Star Details
Spectral Class: G7V
Temperature: 5,440 K
Mass: 0.96 sol
Luminosity: 0.87 lux
Habitable Zone (HZ)
Inner Boundary: 0.89 AU
Outer Boundary: 1.28 AU
Physical Limits
Snow Line: 4.48 AU
Max System Radius: 19.6 AU
Planetary System (9 Planets)
Planet 1 - Terrestrial
Semi-Major Axis: 0.55 AU
Status: Inner (Hot)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 2.46
Radius: 1.43
Gravity: 1.2 G
Time & Orbit
Eccentricity (e): 0.242
Orbit Range: 0.42 AU - 0.68 AU
Year: 152 Days
Day: 25 Hours
Environment
Temp: 200 °C
Axial Tilt: 1.3 °
Atmosphere: Dense COâ‚‚
Biome: Volcanic/Barren
Planet 2 - Terrestrial
Semi-Major Axis: 1.6 AU
Status: Outer (Cold)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 2.27
Radius: 1.39
Gravity: 1.17 G
Time & Orbit
Eccentricity (e): 0.03
Orbit Range: 1.55 AU - 1.65 AU
Year: 754 Days
Day: 14.8 Hours
Environment
Temp: -42 °C
Axial Tilt: 48.6 °
Atmosphere: Thin Nâ‚‚/CHâ‚„
Biome: Ice Cap/Desert
Satellites (1)
Outer Limit: 51,422,037 km
- M1: 294,259 km (0.119 R)
Planet 3 - Terrestrial
Semi-Major Axis: 2.22 AU
Status: Outer (Cold)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 4.69
Radius: 1.86
Gravity: 1.36 G
Time & Orbit
Eccentricity (e): 0.048
Orbit Range: 2.11 AU - 2.33 AU
Year: 1233 Days
Day: 41.4 Hours
Environment
Temp: -88 °C
Axial Tilt: 21 °
Atmosphere: Thin Nâ‚‚/CHâ‚„
Biome: Ice Cap/Desert
Satellites (1)
Outer Limit: 51,422,037 km
- M1: 1,878,351 km (0.102 R)
Planet 4 - Terrestrial
Semi-Major Axis: 2.88 AU
Status: Outer (Cold)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 2.82
Radius: 1.51
Gravity: 1.24 G
Time & Orbit
Eccentricity (e): 0.133
Orbit Range: 2.5 AU - 3.26 AU
Year: 1822 Days
Day: 42.7 Hours
Environment
Temp: -101 °C
Axial Tilt: 17.7 °
Atmosphere: Thin Nâ‚‚/CHâ‚„
Biome: Ice Cap/Desert
Satellites (1)
Outer Limit: 51,422,037 km
- M1: 439,070 km (0.115 R)
Planet 5 - Gas Giant
Semi-Major Axis: 5.1 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 920
Radius: 13.8
Gravity: 4.83 G
Time & Orbit
Eccentricity (e): 0.223
Orbit Range: 3.96 AU - 6.24 AU
Year: 4293 Days
Day: 14.1 Hours
Environment
Temp: -134 °C
Axial Tilt: 25.8 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (72)
Outer Limit: 51,422,037 km
- M1: 189,092 km (0.11 R)
- M2: 411,095 km (0.084 R)
- M3: 557,701 km (0.09 R)
- M4: 644,916 km (0.034 R)
- M5: 774,019 km (0.114 R)
- M6: 1,075,758 km (0.106 R)
- M7: 1,175,390 km (0.091 R)
- M8: 1,606,831 km (0.115 R)
- M9: 1,756,129 km (0.069 R)
- M10: 1,997,880 km (0.1 R)
- M11: 2,122,943 km (0.054 R)
- M12: 2,213,899 km (0.111 R)
- M13: 2,728,815 km (0.114 R)
- M14: 2,908,781 km (0.064 R)
- M15: 3,092,786 km (0.092 R)
- M16: 3,217,701 km (0.081 R)
- M17: 3,668,289 km (0.111 R)
- M18: 4,393,540 km (0.063 R)
- M19: 4,629,306 km (0.119 R)
- M20: 4,797,005 km (0.083 R)
- M21: 4,942,265 km (0.11 R)
- M22: 5,311,921 km (0.083 R)
- M23: 5,588,827 km (0.114 R)
- M24: 5,948,311 km (0.086 R)
- M25: 6,235,987 km (0.083 R)
- M26: 6,582,007 km (0.104 R)
- M27: 6,879,707 km (0.09 R)
- M28: 7,657,466 km (0.062 R)
- M29: 8,028,170 km (0.036 R)
- M30: 8,114,488 km (0.104 R)
- M31: 8,580,635 km (0.081 R)
- M32: 8,816,850 km (0.039 R)
- M33: 9,296,012 km (0.038 R)
- M34: 9,386,818 km (0.109 R)
- M35: 10,030,687 km (0.063 R)
- M36: 10,373,565 km (0.115 R)
- M37: 11,007,112 km (0.074 R)
- M38: 11,103,304 km (0.11 R)
- M39: 11,328,748 km (0.067 R)
- M40: 11,555,688 km (0.03 R)
- M41: 11,784,123 km (0.109 R)
- M42: 11,915,321 km (0.077 R)
- M43: 12,847,316 km (0.118 R)
- M44: 13,152,046 km (0.099 R)
- M45: 13,424,763 km (0.116 R)
- M46: 13,665,017 km (0.026 R)
- M47: 14,289,289 km (0.077 R)
- M48: 14,499,474 km (0.102 R)
- M49: 14,816,772 km (0.065 R)
- M50: 15,314,783 km (0.083 R)
- M51: 15,422,194 km (0.062 R)
- M52: 16,510,369 km (0.059 R)
- M53: 17,623,377 km (0.071 R)
- M54: 17,811,272 km (0.094 R)
- M55: 18,151,009 km (0.068 R)
- M56: 19,106,191 km (0.119 R)
- M57: 19,454,156 km (0.074 R)
- M58: 20,274,102 km (0.081 R)
- M59: 20,946,095 km (0.107 R)
- M60: 21,464,901 km (0.062 R)
- M61: 21,585,327 km (0.071 R)
- M62: 22,028,436 km (0.059 R)
- M63: 22,596,908 km (0.066 R)
- M64: 22,760,119 km (0.093 R)
- M65: 23,334,725 km (0.086 R)
- M66: 24,289,159 km (0.05 R)
- M67: 25,298,646 km (0.07 R)
- M68: 25,851,110 km (0.108 R)
- M69: 27,098,158 km (0.099 R)
- M70: 27,315,075 km (0.045 R)
- M71: 29,115,934 km (0.107 R)
- M72: 29,293,806 km (0.089 R)
Planet 6 - Gas Giant
Semi-Major Axis: 6.5 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 574.1
Radius: 13.7
Gravity: 3.06 G
Time & Orbit
Eccentricity (e): 0.168
Orbit Range: 5.41 AU - 7.59 AU
Year: 6178 Days
Day: 8.2 Hours
Environment
Temp: -165 °C
Axial Tilt: 24.5 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (82)
Outer Limit: 51,422,037 km
- M1: 230,231 km (0.063 R)
- M2: 411,993 km (0.116 R)
- M3: 950,096 km (0.107 R)
- M4: 1,140,385 km (0.078 R)
- M5: 1,376,300 km (0.109 R)
- M6: 1,542,952 km (0.057 R)
- M7: 2,045,900 km (0.106 R)
- M8: 2,141,194 km (0.104 R)
- M9: 2,257,432 km (0.079 R)
- M10: 2,702,336 km (0.103 R)
- M11: 2,913,867 km (0.029 R)
- M12: 3,108,943 km (0.066 R)
- M13: 3,263,926 km (0.081 R)
- M14: 3,421,303 km (0.08 R)
- M15: 3,650,786 km (0.072 R)
- M16: 3,767,473 km (0.092 R)
- M17: 4,173,481 km (0.104 R)
- M18: 4,320,237 km (0.082 R)
- M19: 4,593,851 km (0.099 R)
- M20: 5,395,397 km (0.117 R)
- M21: 5,717,331 km (0.1 R)
- M22: 6,635,414 km (0.101 R)
- M23: 7,126,244 km (0.067 R)
- M24: 7,509,664 km (0.06 R)
- M25: 8,762,845 km (0.106 R)
- M26: 9,046,632 km (0.098 R)
- M27: 9,883,333 km (0.102 R)
- M28: 10,047,143 km (0.111 R)
- M29: 10,311,183 km (0.104 R)
- M30: 10,444,026 km (0.103 R)
- M31: 10,543,957 km (0.09 R)
- M32: 11,287,309 km (0.095 R)
- M33: 11,942,697 km (0.073 R)
- M34: 12,363,217 km (0.074 R)
- M35: 13,544,442 km (0.041 R)
- M36: 13,653,498 km (0.076 R)
- M37: 13,763,004 km (0.09 R)
- M38: 13,982,763 km (0.05 R)
- M39: 14,611,972 km (0.104 R)
- M40: 15,288,304 km (0.101 R)
- M41: 15,554,139 km (0.08 R)
- M42: 15,974,809 km (0.11 R)
- M43: 16,090,298 km (0.086 R)
- M44: 16,671,486 km (0.097 R)
- M45: 16,788,621 km (0.081 R)
- M46: 17,378,037 km (0.054 R)
- M47: 17,814,713 km (0.099 R)
- M48: 18,174,645 km (0.108 R)
- M49: 18,496,580 km (0.067 R)
- M50: 18,901,691 km (0.113 R)
- M51: 19,473,903 km (0.082 R)
- M52: 20,677,118 km (0.106 R)
- M53: 20,971,228 km (0.115 R)
- M54: 21,266,534 km (0.115 R)
- M55: 21,947,055 km (0.084 R)
- M56: 22,161,279 km (0.102 R)
- M57: 22,419,036 km (0.044 R)
- M58: 23,416,854 km (0.096 R)
- M59: 24,296,190 km (0.072 R)
- M60: 24,517,745 km (0.098 R)
- M61: 24,784,478 km (0.118 R)
- M62: 25,725,598 km (0.078 R)
- M63: 26,041,997 km (0.104 R)
- M64: 26,769,941 km (0.073 R)
- M65: 26,998,676 km (0.051 R)
- M66: 27,458,390 km (0.108 R)
- M67: 27,642,994 km (0.089 R)
- M68: 27,781,671 km (0.096 R)
- M69: 28,338,923 km (0.072 R)
- M70: 28,805,968 km (0.118 R)
- M71: 29,040,537 km (0.048 R)
- M72: 29,464,198 km (0.097 R)
- M73: 29,700,563 km (0.088 R)
- M74: 30,079,943 km (0.079 R)
- M75: 30,222,659 km (0.113 R)
- M76: 30,604,284 km (0.115 R)
- M77: 30,699,877 km (0.108 R)
- M78: 31,083,595 km (0.079 R)
- M79: 31,372,319 km (0.064 R)
- M80: 31,710,261 km (0.049 R)
- M81: 31,855,520 km (0.064 R)
- M82: 32,098,018 km (0.086 R)
Planet 7 - Ice Giant
Semi-Major Axis: 14.3 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 984.6
Radius: 8
Gravity: 15.38 G
Time & Orbit
Eccentricity (e): 0.235
Orbit Range: 10.94 AU - 17.66 AU
Year: 20159 Days
Day: 17.4 Hours
Environment
Temp: -200 °C
Axial Tilt: 33 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (91)
Outer Limit: 51,422,037 km
- M1: 107,262 km (0.074 R)
- M2: 161,117 km (0.109 R)
- M3: 307,723 km (0.065 R)
- M4: 525,238 km (0.058 R)
- M5: 616,343 km (0.112 R)
- M6: 950,096 km (0.086 R)
- M7: 1,430,604 km (0.09 R)
- M8: 2,161,240 km (0.082 R)
- M9: 2,274,037 km (0.083 R)
- M10: 2,664,188 km (0.103 R)
- M11: 4,048,118 km (0.037 R)
- M12: 4,187,693 km (0.074 R)
- M13: 4,376,336 km (0.1 R)
- M14: 4,519,800 km (0.1 R)
- M15: 5,721,670 km (0.107 R)
- M16: 6,411,765 km (0.116 R)
- M17: 6,520,223 km (0.098 R)
- M18: 6,629,430 km (0.036 R)
- M19: 6,739,085 km (0.101 R)
- M20: 7,985,834 km (0.116 R)
- M21: 8,161,162 km (0.119 R)
- M22: 8,516,008 km (0.096 R)
- M23: 8,755,365 km (0.113 R)
- M24: 10,237,281 km (0.069 R)
- M25: 10,748,457 km (0.088 R)
- M26: 14,196,688 km (0.027 R)
- M27: 14,480,625 km (0.089 R)
- M28: 14,623,192 km (0.094 R)
- M29: 15,270,801 km (0.108 R)
- M30: 16,444,995 km (0.037 R)
- M31: 18,723,819 km (0.104 R)
- M32: 18,801,460 km (0.075 R)
- M33: 18,879,251 km (0.083 R)
- M34: 19,269,702 km (0.103 R)
- M35: 19,426,630 km (0.058 R)
- M36: 20,536,945 km (0.099 R)
- M37: 21,180,665 km (0.105 R)
- M38: 21,667,756 km (0.115 R)
- M39: 24,158,111 km (0.052 R)
- M40: 24,412,129 km (0.043 R)
- M41: 26,475,682 km (0.115 R)
- M42: 27,351,876 km (0.111 R)
- M43: 28,326,806 km (0.081 R)
- M44: 30,310,324 km (0.03 R)
- M45: 30,401,578 km (0.066 R)
- M46: 30,767,345 km (0.051 R)
- M47: 31,134,608 km (0.114 R)
- M48: 32,059,123 km (0.117 R)
- M49: 32,524,821 km (0.037 R)
- M50: 32,618,320 km (0.082 R)
- M51: 34,124,770 km (0.109 R)
- M52: 34,314,610 km (0.061 R)
- M53: 34,790,930 km (0.116 R)
- M54: 36,039,623 km (0.066 R)
- M55: 36,329,843 km (0.104 R)
- M56: 36,523,722 km (0.106 R)
- M57: 37,107,602 km (0.05 R)
- M58: 37,205,140 km (0.091 R)
- M59: 37,596,488 km (0.109 R)
- M60: 37,890,747 km (0.102 R)
- M61: 38,877,495 km (0.108 R)
- M62: 41,482,143 km (0.044 R)
- M63: 42,396,934 km (0.074 R)
- M64: 42,498,960 km (0.096 R)
- M65: 44,453,306 km (0.103 R)
- M66: 45,076,531 km (0.085 R)
- M67: 45,180,651 km (0.097 R)
- M68: 47,280,557 km (0.051 R)
- M69: 48,983,130 km (0.092 R)
- M70: 49,412,027 km (0.1 R)
- M71: 55,544,493 km (0.097 R)
- M72: 57,114,672 km (0.116 R)
- M73: 58,358,728 km (0.032 R)
- M74: 60,298,563 km (0.116 R)
- M75: 61,796,337 km (0.08 R)
- M76: 62,491,818 km (0.032 R)
- M77: 62,724,143 km (0.059 R)
- M78: 62,840,381 km (0.117 R)
- M79: 65,534,938 km (0.103 R)
- M80: 66,244,032 km (0.059 R)
- M81: 66,836,888 km (0.036 R)
- M82: 72,251,433 km (0.04 R)
- M83: 73,596,168 km (0.044 R)
- M84: 75,319,686 km (0.045 R)
- M85: 76,931,902 km (0.048 R)
- M86: 78,179,847 km (0.105 R)
- M87: 80,442,964 km (0.12 R)
- M88: 82,218,092 km (0.069 R)
- M89: 82,345,250 km (0.071 R)
- M90: 83,621,769 km (0.071 R)
- M91: 85,548,590 km (0.057 R)
Planet 8 - Ice Giant
Semi-Major Axis: 14.99 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 324.9
Radius: 5
Gravity: 13 G
Time & Orbit
Eccentricity (e): 0.021
Orbit Range: 14.68 AU - 15.3 AU
Year: 21635 Days
Day: 19.4 Hours
Environment
Temp: -193 °C
Axial Tilt: 4.7 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (94)
Outer Limit: 51,422,037 km
- M1: 72,405 km (0.085 R)
- M2: 124,615 km (0.055 R)
- M3: 213,027 km (0.113 R)
- M4: 506,838 km (0.112 R)
- M5: 580,739 km (0.079 R)
- M6: 658,530 km (0.047 R)
- M7: 760,556 km (0.119 R)
- M8: 867,967 km (0.088 R)
- M9: 1,050,027 km (0.092 R)
- M10: 1,121,386 km (0.072 R)
- M11: 1,748,799 km (0.111 R)
- M12: 2,218,088 km (0.105 R)
- M13: 2,530,149 km (0.052 R)
- M14: 2,691,415 km (0.066 R)
- M15: 2,922,843 km (0.078 R)
- M16: 2,990,162 km (0.07 R)
- M17: 3,092,188 km (0.086 R)
- M18: 3,195,261 km (0.082 R)
- M19: 4,249,028 km (0.099 R)
- M20: 4,557,200 km (0.107 R)
- M21: 5,113,704 km (0.082 R)
- M22: 5,194,936 km (0.107 R)
- M23: 5,276,616 km (0.092 R)
- M24: 5,649,564 km (0.116 R)
- M25: 5,775,675 km (0.096 R)
- M26: 6,773,642 km (0.08 R)
- M27: 7,315,336 km (0.074 R)
- M28: 7,870,643 km (0.116 R)
- M29: 8,011,714 km (0.115 R)
- M30: 8,680,566 km (0.065 R)
- M31: 8,874,894 km (0.119 R)
- M32: 9,119,935 km (0.058 R)
- M33: 9,367,220 km (0.094 R)
- M34: 10,532,737 km (0.091 R)
- M35: 10,636,259 km (0.101 R)
- M36: 11,317,229 km (0.068 R)
- M37: 12,446,692 km (0.102 R)
- M38: 12,556,048 km (0.109 R)
- M39: 14,464,768 km (0.094 R)
- M40: 15,452,562 km (0.088 R)
- M41: 16,702,453 km (0.094 R)
- M42: 17,615,000 km (0.108 R)
- M43: 18,046,290 km (0.05 R)
- M44: 18,919,344 km (0.087 R)
- M45: 20,126,150 km (0.092 R)
- M46: 21,949,598 km (0.099 R)
- M47: 23,418,799 km (0.104 R)
- M48: 24,850,600 km (0.081 R)
- M49: 26,310,675 km (0.119 R)
- M50: 26,521,459 km (0.11 R)
- M51: 27,584,052 km (0.109 R)
- M52: 28,084,607 km (0.11 R)
- M53: 30,116,894 km (0.081 R)
- M54: 30,484,755 km (0.043 R)
- M55: 31,150,615 km (0.105 R)
- M56: 31,671,814 km (0.118 R)
- M57: 32,196,005 km (0.079 R)
- M58: 32,798,436 km (0.097 R)
- M59: 33,252,764 km (0.11 R)
- M60: 33,404,606 km (0.107 R)
- M61: 33,632,892 km (0.07 R)
- M62: 34,014,517 km (0.099 R)
- M63: 34,244,299 km (0.111 R)
- M64: 34,320,893 km (0.104 R)
- M65: 35,090,724 km (0.09 R)
- M66: 35,168,066 km (0.102 R)
- M67: 35,477,883 km (0.108 R)
- M68: 35,633,016 km (0.085 R)
- M69: 37,434,174 km (0.067 R)
- M70: 39,747,107 km (0.028 R)
- M71: 45,012,503 km (0.117 R)
- M72: 45,517,247 km (0.092 R)
- M73: 45,685,843 km (0.096 R)
- M74: 45,770,217 km (0.119 R)
- M75: 45,939,262 km (0.12 R)
- M76: 46,193,130 km (0.094 R)
- M77: 46,277,802 km (0.078 R)
- M78: 46,787,183 km (0.091 R)
- M79: 50,754,070 km (0.093 R)
- M80: 52,600,407 km (0.081 R)
- M81: 52,954,654 km (0.092 R)
- M82: 53,043,366 km (0.092 R)
- M83: 53,132,077 km (0.119 R)
- M84: 53,309,650 km (0.096 R)
- M85: 54,916,780 km (0.077 R)
- M86: 55,816,462 km (0.09 R)
- M87: 56,268,247 km (0.112 R)
- M88: 56,811,886 km (0.117 R)
- M89: 57,812,995 km (0.096 R)
- M90: 58,453,124 km (0.074 R)
- M91: 58,544,828 km (0.066 R)
- M92: 59,925,167 km (0.115 R)
- M93: 60,758,577 km (0.095 R)
- M94: 62,155,971 km (0.109 R)
Planet 9 - Ice Giant
Semi-Major Axis: 19.53 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 81.7
Radius: 6.2
Gravity: 2.13 G
Time & Orbit
Eccentricity (e): 0.05
Orbit Range: 18.55 AU - 20.51 AU
Year: 32174 Days
Day: 22.7 Hours
Environment
Temp: -205 °C
Axial Tilt: 21.2 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (47)
Outer Limit: 51,422,037 km
- M1: 211,531 km (0.074 R)
- M2: 330,611 km (0.082 R)
- M3: 534,962 km (0.099 R)
- M4: 1,069,026 km (0.069 R)
- M5: 1,417,440 km (0.093 R)
- M6: 1,774,380 km (0.093 R)
- M7: 1,899,444 km (0.066 R)
- M8: 1,975,889 km (0.08 R)
- M9: 2,211,505 km (0.11 R)
- M10: 2,623,947 km (0.077 R)
- M11: 3,363,110 km (0.086 R)
- M12: 3,612,639 km (0.108 R)
- M13: 4,773,219 km (0.105 R)
- M14: 5,411,553 km (0.12 R)
- M15: 5,963,719 km (0.044 R)
- M16: 6,341,753 km (0.069 R)
- M17: 7,807,064 km (0.092 R)
- M18: 8,471,727 km (0.118 R)
- M19: 9,025,240 km (0.108 R)
- M20: 9,502,606 km (0.102 R)
- M21: 11,962,444 km (0.036 R)
- M22: 12,151,985 km (0.117 R)
- M23: 12,872,149 km (0.03 R)
- M24: 13,310,770 km (0.108 R)
- M25: 15,011,698 km (0.09 R)
- M26: 16,992,224 km (0.063 R)
- M27: 18,667,720 km (0.042 R)
- M28: 18,722,622 km (0.115 R)
- M29: 19,219,287 km (0.082 R)
- M30: 20,735,312 km (0.057 R)
- M31: 21,421,368 km (0.105 R)
- M32: 24,179,055 km (0.083 R)
- M33: 25,629,855 km (0.084 R)
- M34: 26,119,639 km (0.075 R)
- M35: 27,732,752 km (0.099 R)
- M36: 28,741,491 km (0.079 R)
- M37: 30,406,066 km (0.1 R)
- M38: 35,719,932 km (0.106 R)
- M39: 37,993,820 km (0.034 R)
- M40: 38,063,383 km (0.11 R)
- M41: 38,762,155 km (0.106 R)
- M42: 44,869,488 km (0.054 R)
- M43: 45,459,502 km (0.102 R)
- M44: 45,829,457 km (0.073 R)
- M45: 47,544,597 km (0.05 R)
- M46: 49,280,680 km (0.104 R)
- M47: 49,508,667 km (0.093 R)
Kuiper Belt
Range: 30 - 50 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 439 - 13,737 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.