G0V Star System Generated (Seed: 1768677465)
Star Details
Spectral Class: G0V
Temperature: 5,960 K
Mass: 1.09 sol
Luminosity: 1.35 lux
Habitable Zone (HZ)
Inner Boundary: 1.11 AU
Outer Boundary: 1.6 AU
Physical Limits
Snow Line: 5.58 AU
Max System Radius: 20.9 AU
Planetary System (10 Planets)
Planet 1 - Terrestrial
Semi-Major Axis: 0.89 AU
Status: Inner (Hot)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 0.63
Radius: 0.83
Gravity: 0.91 G
Time & Orbit
Eccentricity (e): 0.173
Orbit Range: 0.74 AU - 1.04 AU
Year: 294 Days
Day: 44.3 Hours
Environment
Temp: 138 °C
Axial Tilt: 31.9 °
Atmosphere: Dense COâ‚‚
Biome: Volcanic/Barren
Planet 2 - Terrestrial
Semi-Major Axis: 1.03 AU
Status: Inner (Hot)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 4.77
Radius: 1.87
Gravity: 1.36 G
Time & Orbit
Eccentricity (e): 0.172
Orbit Range: 0.85 AU - 1.21 AU
Year: 366 Days
Day: 24.1 Hours
Environment
Temp: 96 °C
Axial Tilt: 10.1 °
Atmosphere: Dense COâ‚‚
Biome: Volcanic/Barren
Planet 3 - Terrestrial
Semi-Major Axis: 1.52 AU
Status: HZ
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 3.73
Radius: 1.69
Gravity: 1.31 G
Time & Orbit
Eccentricity (e): 0.114
Orbit Range: 1.35 AU - 1.69 AU
Year: 656 Days
Day: 29.5 Hours
Environment
Temp: -12 °C
Axial Tilt: 13 °
Atmosphere: Nâ‚‚, Oâ‚‚
Biome: Arid/Tundra
Satellites (1)
Outer Limit: 75,398,660 km
- M1: 719,566 km (0.096 R)
Planet 4 - Terrestrial
Semi-Major Axis: 2.48 AU
Status: Outer (Cold)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 3.23
Radius: 1.6
Gravity: 1.26 G
Time & Orbit
Eccentricity (e): 0.045
Orbit Range: 2.37 AU - 2.59 AU
Year: 1366 Days
Day: 28.1 Hours
Environment
Temp: -64 °C
Axial Tilt: 1.2 °
Atmosphere: Thin Nâ‚‚/CHâ‚„
Biome: Ice Cap/Desert
Satellites (2)
Outer Limit: 75,398,660 km
- M1: 137,780 km (0.074 R)
- M2: 429,047 km (0.111 R)
Planet 5 - Terrestrial
Semi-Major Axis: 2.73 AU
Status: Outer (Cold)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 1.93
Radius: 1.3
Gravity: 1.14 G
Time & Orbit
Eccentricity (e): 0.242
Orbit Range: 2.07 AU - 3.39 AU
Year: 1578 Days
Day: 23.1 Hours
Environment
Temp: -89 °C
Axial Tilt: 17.6 °
Atmosphere: Thin Nâ‚‚/CHâ‚„
Biome: Ice Cap/Desert
Planet 6 - Terrestrial
Semi-Major Axis: 3.37 AU
Status: Outer (Cold)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 2.2
Radius: 1.37
Gravity: 1.17 G
Time & Orbit
Eccentricity (e): 0.178
Orbit Range: 2.77 AU - 3.97 AU
Year: 2164 Days
Day: 34.8 Hours
Environment
Temp: -101 °C
Axial Tilt: 26.7 °
Atmosphere: Thin Nâ‚‚/CHâ‚„
Biome: Ice Cap/Desert
Asteroid Belt
Center: 7.4 AU
Composition
Type: Main (Rocky/Icy Mix)
A dense region of planetesimals and debris.
Boundary
Planet 7 - Gas Giant
Semi-Major Axis: 11.42 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 842
Radius: 12.4
Gravity: 5.48 G
Time & Orbit
Eccentricity (e): 0.175
Orbit Range: 9.42 AU - 13.42 AU
Year: 13501 Days
Day: 11.9 Hours
Environment
Temp: -172 °C
Axial Tilt: 32.8 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (85)
Outer Limit: 75,398,660 km
- M1: 236,514 km (0.06 R)
- M2: 463,155 km (0.104 R)
- M3: 563,834 km (0.109 R)
- M4: 712,086 km (0.104 R)
- M5: 853,755 km (0.082 R)
- M6: 1,073,814 km (0.104 R)
- M7: 1,787,545 km (0.105 R)
- M8: 1,957,488 km (0.1 R)
- M9: 2,132,817 km (0.091 R)
- M10: 3,019,483 km (0.052 R)
- M11: 3,292,350 km (0.06 R)
- M12: 3,752,812 km (0.08 R)
- M13: 3,898,670 km (0.059 R)
- M14: 4,009,373 km (0.052 R)
- M15: 4,462,654 km (0.054 R)
- M16: 5,213,785 km (0.093 R)
- M17: 5,418,136 km (0.084 R)
- M18: 6,004,260 km (0.111 R)
- M19: 7,010,755 km (0.09 R)
- M20: 7,281,976 km (0.118 R)
- M21: 7,510,711 km (0.059 R)
- M22: 8,116,432 km (0.103 R)
- M23: 8,786,481 km (0.082 R)
- M24: 9,623,781 km (0.069 R)
- M25: 9,874,955 km (0.058 R)
- M26: 10,641,495 km (0.07 R)
- M27: 11,268,609 km (0.12 R)
- M28: 12,123,411 km (0.11 R)
- M29: 12,613,344 km (0.106 R)
- M30: 13,388,411 km (0.06 R)
- M31: 13,951,497 km (0.069 R)
- M32: 14,522,363 km (0.084 R)
- M33: 14,637,553 km (0.078 R)
- M34: 15,101,007 km (0.07 R)
- M35: 15,746,073 km (0.05 R)
- M36: 15,864,405 km (0.071 R)
- M37: 17,306,529 km (0.113 R)
- M38: 18,291,332 km (0.105 R)
- M39: 18,853,221 km (0.113 R)
- M40: 19,104,695 km (0.077 R)
- M41: 20,122,110 km (0.077 R)
- M42: 20,702,101 km (0.105 R)
- M43: 20,961,654 km (0.04 R)
- M44: 22,808,589 km (0.081 R)
- M45: 23,345,795 km (0.115 R)
- M46: 24,296,041 km (0.096 R)
- M47: 25,397,380 km (0.085 R)
- M48: 26,938,388 km (0.118 R)
- M49: 27,363,844 km (0.073 R)
- M50: 28,149,831 km (0.041 R)
- M51: 29,597,640 km (0.117 R)
- M52: 30,110,162 km (0.04 R)
- M53: 30,330,669 km (0.056 R)
- M54: 30,478,023 km (0.085 R)
- M55: 31,143,883 km (0.083 R)
- M56: 32,414,717 km (0.096 R)
- M57: 34,161,123 km (0.108 R)
- M58: 34,467,948 km (0.118 R)
- M59: 35,007,099 km (0.111 R)
- M60: 36,406,287 km (0.088 R)
- M61: 38,220,610 km (0.113 R)
- M62: 39,741,572 km (0.032 R)
- M63: 40,468,917 km (0.108 R)
- M64: 40,956,307 km (0.08 R)
- M65: 41,363,961 km (0.108 R)
- M66: 43,754,535 km (0.067 R)
- M67: 44,421,891 km (0.1 R)
- M68: 46,020,344 km (0.107 R)
- M69: 46,274,361 km (0.115 R)
- M70: 48,237,983 km (0.112 R)
- M71: 48,754,694 km (0.068 R)
- M72: 48,927,330 km (0.116 R)
- M73: 49,706,735 km (0.082 R)
- M74: 50,839,939 km (0.112 R)
- M75: 51,629,367 km (0.077 R)
- M76: 53,042,767 km (0.11 R)
- M77: 53,843,415 km (0.12 R)
- M78: 53,932,725 km (0.066 R)
- M79: 54,558,493 km (0.077 R)
- M80: 54,917,229 km (0.055 R)
- M81: 55,998,073 km (0.058 R)
- M82: 57,085,949 km (0.112 R)
- M83: 57,997,748 km (0.071 R)
- M84: 59,835,857 km (0.094 R)
- M85: 62,253,957 km (0.102 R)
Planet 8 - Gas Giant
Semi-Major Axis: 11.5 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 476.1
Radius: 8.9
Gravity: 6.01 G
Time & Orbit
Eccentricity (e): 0.215
Orbit Range: 9.03 AU - 13.97 AU
Year: 13643 Days
Day: 10.5 Hours
Environment
Temp: -180 °C
Axial Tilt: 22 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (96)
Outer Limit: 75,398,660 km
- M1: 115,340 km (0.1 R)
- M2: 280,795 km (0.058 R)
- M3: 658,829 km (0.098 R)
- M4: 1,224,309 km (0.11 R)
- M5: 1,357,002 km (0.107 R)
- M6: 1,783,655 km (0.073 R)
- M7: 2,064,301 km (0.107 R)
- M8: 2,169,768 km (0.114 R)
- M9: 2,610,184 km (0.117 R)
- M10: 3,168,932 km (0.08 R)
- M11: 3,635,677 km (0.057 R)
- M12: 4,359,132 km (0.12 R)
- M13: 4,495,416 km (0.081 R)
- M14: 4,564,231 km (0.059 R)
- M15: 4,842,483 km (0.091 R)
- M16: 5,379,240 km (0.107 R)
- M17: 5,636,100 km (0.078 R)
- M18: 6,315,424 km (0.095 R)
- M19: 6,431,063 km (0.05 R)
- M20: 6,508,704 km (0.096 R)
- M21: 6,703,929 km (0.088 R)
- M22: 7,422,747 km (0.081 R)
- M23: 7,957,260 km (0.057 R)
- M24: 8,124,212 km (0.084 R)
- M25: 8,292,210 km (0.084 R)
- M26: 8,760,451 km (0.109 R)
- M27: 9,325,034 km (0.045 R)
- M28: 9,589,523 km (0.073 R)
- M29: 9,722,665 km (0.043 R)
- M30: 9,856,555 km (0.049 R)
- M31: 10,534,682 km (0.079 R)
- M32: 11,698,404 km (0.088 R)
- M33: 12,175,172 km (0.082 R)
- M34: 12,319,534 km (0.04 R)
- M35: 13,593,659 km (0.034 R)
- M36: 15,063,758 km (0.095 R)
- M37: 16,265,178 km (0.07 R)
- M38: 16,530,565 km (0.067 R)
- M39: 17,172,938 km (0.078 R)
- M40: 18,151,906 km (0.11 R)
- M41: 18,648,272 km (0.072 R)
- M42: 18,814,625 km (0.108 R)
- M43: 19,429,173 km (0.092 R)
- M44: 19,541,521 km (0.115 R)
- M45: 19,880,061 km (0.05 R)
- M46: 21,253,818 km (0.092 R)
- M47: 21,718,469 km (0.062 R)
- M48: 21,776,812 km (0.119 R)
- M49: 22,598,703 km (0.072 R)
- M50: 22,835,367 km (0.097 R)
- M51: 22,954,148 km (0.11 R)
- M52: 24,151,978 km (0.092 R)
- M53: 24,636,825 km (0.113 R)
- M54: 25,308,818 km (0.099 R)
- M55: 25,370,153 km (0.11 R)
- M56: 26,048,729 km (0.066 R)
- M57: 26,483,610 km (0.07 R)
- M58: 26,920,885 km (0.116 R)
- M59: 27,234,741 km (0.118 R)
- M60: 27,360,553 km (0.031 R)
- M61: 27,739,335 km (0.096 R)
- M62: 28,438,256 km (0.073 R)
- M63: 29,529,722 km (0.114 R)
- M64: 29,723,751 km (0.11 R)
- M65: 31,093,917 km (0.057 R)
- M66: 31,819,766 km (0.092 R)
- M67: 31,886,038 km (0.106 R)
- M68: 32,551,300 km (0.076 R)
- M69: 33,355,538 km (0.082 R)
- M70: 34,642,379 km (0.119 R)
- M71: 34,983,612 km (0.101 R)
- M72: 35,876,412 km (0.063 R)
- M73: 36,568,152 km (0.063 R)
- M74: 38,035,259 km (0.116 R)
- M75: 38,105,570 km (0.077 R)
- M76: 38,246,341 km (0.039 R)
- M77: 38,387,262 km (0.108 R)
- M78: 39,878,005 km (0.114 R)
- M79: 40,021,021 km (0.096 R)
- M80: 41,822,329 km (0.082 R)
- M81: 41,967,588 km (0.108 R)
- M82: 43,209,101 km (0.113 R)
- M83: 44,166,527 km (0.07 R)
- M84: 46,477,814 km (0.107 R)
- M85: 47,610,121 km (0.031 R)
- M86: 47,761,813 km (0.112 R)
- M87: 47,989,651 km (0.058 R)
- M88: 48,217,787 km (0.043 R)
- M89: 48,293,933 km (0.064 R)
- M90: 48,522,668 km (0.08 R)
- M91: 49,364,156 km (0.109 R)
- M92: 49,517,643 km (0.082 R)
- M93: 49,671,280 km (0.061 R)
- M94: 50,442,158 km (0.072 R)
- M95: 51,216,776 km (0.07 R)
- M96: 51,995,433 km (0.119 R)
Planet 9 - Ice Giant
Semi-Major Axis: 15.22 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 893.1
Radius: 4.3
Gravity: 48.3 G
Time & Orbit
Eccentricity (e): 0.209
Orbit Range: 12.04 AU - 18.4 AU
Year: 20773 Days
Day: 16.3 Hours
Environment
Temp: -194 °C
Axial Tilt: 41.4 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (98)
Outer Limit: 75,398,660 km
- M1: 370,255 km (0.1 R)
- M2: 587,620 km (0.107 R)
- M3: 813,214 km (0.048 R)
- M4: 921,523 km (0.083 R)
- M5: 1,063,790 km (0.089 R)
- M6: 1,243,607 km (0.104 R)
- M7: 1,274,424 km (0.109 R)
- M8: 1,733,839 km (0.119 R)
- M9: 1,803,402 km (0.104 R)
- M10: 2,239,779 km (0.109 R)
- M11: 2,315,625 km (0.12 R)
- M12: 2,627,387 km (0.079 R)
- M13: 3,550,855 km (0.096 R)
- M14: 3,639,417 km (0.1 R)
- M15: 4,516,360 km (0.112 R)
- M16: 4,855,348 km (0.112 R)
- M17: 5,353,509 km (0.052 R)
- M18: 5,455,086 km (0.07 R)
- M19: 5,815,767 km (0.115 R)
- M20: 6,397,852 km (0.045 R)
- M21: 7,731,068 km (0.081 R)
- M22: 7,845,960 km (0.075 R)
- M23: 8,428,793 km (0.09 R)
- M24: 8,965,101 km (0.112 R)
- M25: 9,267,887 km (0.072 R)
- M26: 10,133,311 km (0.119 R)
- M27: 10,259,123 km (0.101 R)
- M28: 11,413,869 km (0.106 R)
- M29: 11,675,964 km (0.04 R)
- M30: 12,072,847 km (0.067 R)
- M31: 12,541,537 km (0.107 R)
- M32: 12,947,995 km (0.098 R)
- M33: 13,221,460 km (0.107 R)
- M34: 13,704,362 km (0.052 R)
- M35: 14,052,925 km (0.025 R)
- M36: 14,193,248 km (0.112 R)
- M37: 14,545,850 km (0.083 R)
- M38: 15,044,310 km (0.058 R)
- M39: 15,548,305 km (0.097 R)
- M40: 15,984,832 km (0.111 R)
- M41: 16,795,353 km (0.085 R)
- M42: 17,846,278 km (0.073 R)
- M43: 20,644,506 km (0.112 R)
- M44: 21,365,119 km (0.051 R)
- M45: 22,012,429 km (0.09 R)
- M46: 23,909,330 km (0.082 R)
- M47: 23,992,955 km (0.079 R)
- M48: 24,496,951 km (0.084 R)
- M49: 25,429,992 km (0.105 R)
- M50: 25,857,992 km (0.106 R)
- M51: 29,545,280 km (0.094 R)
- M52: 32,093,082 km (0.113 R)
- M53: 33,393,087 km (0.114 R)
- M54: 34,143,769 km (0.084 R)
- M55: 35,375,259 km (0.072 R)
- M56: 37,104,311 km (0.094 R)
- M57: 37,589,457 km (0.099 R)
- M58: 38,076,697 km (0.078 R)
- M59: 38,468,045 km (0.029 R)
- M60: 39,254,631 km (0.094 R)
- M61: 39,452,100 km (0.108 R)
- M62: 40,245,418 km (0.112 R)
- M63: 41,545,573 km (0.112 R)
- M64: 41,746,931 km (0.079 R)
- M65: 42,150,397 km (0.11 R)
- M66: 42,961,217 km (0.052 R)
- M67: 44,907,486 km (0.055 R)
- M68: 50,164,804 km (0.109 R)
- M69: 50,379,028 km (0.119 R)
- M70: 52,756,437 km (0.116 R)
- M71: 52,974,401 km (0.115 R)
- M72: 53,301,871 km (0.062 R)
- M73: 53,411,077 km (0.11 R)
- M74: 55,170,049 km (0.109 R)
- M75: 55,612,859 km (0.117 R)
- M76: 60,217,930 km (0.118 R)
- M77: 62,047,961 km (0.106 R)
- M78: 63,432,340 km (0.064 R)
- M79: 63,548,278 km (0.116 R)
- M80: 65,411,071 km (0.069 R)
- M81: 66,231,764 km (0.079 R)
- M82: 66,349,199 km (0.096 R)
- M83: 66,702,100 km (0.098 R)
- M84: 66,937,866 km (0.118 R)
- M85: 69,787,107 km (0.096 R)
- M86: 70,625,604 km (0.11 R)
- M87: 71,346,964 km (0.054 R)
- M88: 73,282,462 km (0.115 R)
- M89: 73,525,558 km (0.1 R)
- M90: 74,378,715 km (0.118 R)
- M91: 74,867,750 km (0.084 R)
- M92: 76,340,990 km (0.086 R)
- M93: 78,568,951 km (0.1 R)
- M94: 78,693,267 km (0.047 R)
- M95: 79,565,871 km (0.058 R)
- M96: 81,320,804 km (0.063 R)
- M97: 81,824,500 km (0.105 R)
- M98: 82,835,034 km (0.11 R)
Planet 10 - Ice Giant
Semi-Major Axis: 18.27 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 357.2
Radius: 3.6
Gravity: 27.56 G
Time & Orbit
Eccentricity (e): 0.068
Orbit Range: 17.03 AU - 19.51 AU
Year: 27320 Days
Day: 17.6 Hours
Environment
Temp: -189 °C
Axial Tilt: 24.6 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (93)
Outer Limit: 75,398,660 km
- M1: 98,735 km (0.059 R)
- M2: 1,293,573 km (0.109 R)
- M3: 1,440,328 km (0.093 R)
- M4: 1,530,985 km (0.104 R)
- M5: 1,978,432 km (0.115 R)
- M6: 2,286,155 km (0.117 R)
- M7: 2,321,310 km (0.1 R)
- M8: 2,831,439 km (0.107 R)
- M9: 3,295,342 km (0.116 R)
- M10: 3,782,433 km (0.12 R)
- M11: 4,248,430 km (0.088 R)
- M12: 4,867,466 km (0.065 R)
- M13: 5,280,057 km (0.107 R)
- M14: 5,703,718 km (0.044 R)
- M15: 6,483,572 km (0.078 R)
- M16: 6,533,537 km (0.076 R)
- M17: 7,348,247 km (0.112 R)
- M18: 7,609,445 km (0.096 R)
- M19: 7,661,954 km (0.079 R)
- M20: 8,410,841 km (0.082 R)
- M21: 8,793,961 km (0.047 R)
- M22: 9,747,947 km (0.109 R)
- M23: 9,919,685 km (0.1 R)
- M24: 10,734,246 km (0.1 R)
- M25: 11,934,769 km (0.06 R)
- M26: 13,177,029 km (0.055 R)
- M27: 13,303,439 km (0.056 R)
- M28: 14,459,681 km (0.108 R)
- M29: 15,248,212 km (0.089 R)
- M30: 15,781,678 km (0.098 R)
- M31: 15,916,017 km (0.117 R)
- M32: 16,798,195 km (0.081 R)
- M33: 17,626,668 km (0.107 R)
- M34: 17,905,668 km (0.09 R)
- M35: 18,680,585 km (0.09 R)
- M36: 20,336,035 km (0.092 R)
- M37: 20,996,510 km (0.07 R)
- M38: 22,715,988 km (0.046 R)
- M39: 23,707,672 km (0.064 R)
- M40: 23,938,502 km (0.098 R)
- M41: 24,170,229 km (0.042 R)
- M42: 24,324,913 km (0.087 R)
- M43: 24,402,554 km (0.079 R)
- M44: 26,526,694 km (0.054 R)
- M45: 26,766,350 km (0.081 R)
- M46: 27,570,439 km (0.112 R)
- M47: 27,732,154 km (0.074 R)
- M48: 28,382,306 km (0.086 R)
- M49: 29,037,545 km (0.108 R)
- M50: 33,415,826 km (0.085 R)
- M51: 35,680,738 km (0.056 R)
- M52: 35,768,851 km (0.067 R)
- M53: 36,033,639 km (0.089 R)
- M54: 36,476,299 km (0.116 R)
- M55: 36,565,011 km (0.12 R)
- M56: 37,545,924 km (0.087 R)
- M57: 37,635,533 km (0.071 R)
- M58: 39,624,886 km (0.09 R)
- M59: 40,265,015 km (0.092 R)
- M60: 40,632,278 km (0.092 R)
- M61: 42,765,842 km (0.115 R)
- M62: 43,140,585 km (0.097 R)
- M63: 43,610,472 km (0.062 R)
- M64: 44,745,322 km (0.033 R)
- M65: 46,465,697 km (0.07 R)
- M66: 47,527,543 km (0.095 R)
- M67: 48,499,929 km (0.112 R)
- M68: 49,086,502 km (0.116 R)
- M69: 50,167,945 km (0.119 R)
- M70: 51,854,512 km (0.049 R)
- M71: 51,954,293 km (0.091 R)
- M72: 52,454,249 km (0.12 R)
- M73: 53,358,120 km (0.093 R)
- M74: 55,283,295 km (0.118 R)
- M75: 56,408,121 km (0.091 R)
- M76: 57,127,836 km (0.086 R)
- M77: 57,437,205 km (0.065 R)
- M78: 58,264,930 km (0.113 R)
- M79: 60,456,539 km (0.115 R)
- M80: 61,298,625 km (0.057 R)
- M81: 61,404,092 km (0.112 R)
- M82: 61,509,708 km (0.091 R)
- M83: 63,207,195 km (0.069 R)
- M84: 63,740,810 km (0.045 R)
- M85: 64,275,922 km (0.102 R)
- M86: 65,782,073 km (0.089 R)
- M87: 67,082,378 km (0.106 R)
- M88: 69,378,107 km (0.096 R)
- M89: 69,488,061 km (0.037 R)
- M90: 69,928,627 km (0.089 R)
- M91: 70,038,881 km (0.053 R)
- M92: 71,699,567 km (0.116 R)
- M93: 72,144,620 km (0.11 R)
Kuiper Belt
Range: 31.4 - 61.4 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 515 - 11,991 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.