G7V Star System Generated (Seed: 1767288394)
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 (8 Planets)
Planet 1 - Terrestrial
Semi-Major Axis: 1.49 AU
Status: Outer (Cold)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 2.62
Radius: 1.47
Gravity: 1.21 G
Time & Orbit
Eccentricity (e): 0.041
Orbit Range: 1.43 AU - 1.55 AU
Year: 671 Days
Day: 44.2 Hours
Environment
Temp: -32 °C
Axial Tilt: 16.6 °
Atmosphere: Thin Nâ‚‚/CHâ‚„
Biome: Ice Cap/Desert
Planet 2 - Terrestrial
Semi-Major Axis: 1.59 AU
Status: Outer (Cold)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 3.28
Radius: 1.61
Gravity: 1.27 G
Time & Orbit
Eccentricity (e): 0.196
Orbit Range: 1.28 AU - 1.9 AU
Year: 740 Days
Day: 22 Hours
Environment
Temp: -54 °C
Axial Tilt: 16.2 °
Atmosphere: Thin Nâ‚‚/CHâ‚„
Biome: Ice Cap/Desert
Satellites (1)
Outer Limit: 65,540,982 km
- M1: 433,834 km (0.116 R)
Planet 3 - Terrestrial
Semi-Major Axis: 3.17 AU
Status: Outer (Cold)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 4.32
Radius: 1.8
Gravity: 1.33 G
Time & Orbit
Eccentricity (e): 0.231
Orbit Range: 2.44 AU - 3.9 AU
Year: 2082 Days
Day: 23.4 Hours
Environment
Temp: -105 °C
Axial Tilt: 31.5 °
Atmosphere: Thin Nâ‚‚/CHâ‚„
Biome: Ice Cap/Desert
Planet 4 - Gas Giant
Semi-Major Axis: 5.34 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 575.2
Radius: 14
Gravity: 2.93 G
Time & Orbit
Eccentricity (e): 0.087
Orbit Range: 4.88 AU - 5.8 AU
Year: 4553 Days
Day: 12.5 Hours
Environment
Temp: -145 °C
Axial Tilt: 8.2 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (75)
Outer Limit: 65,540,982 km
- M1: 279,150 km (0.099 R)
- M2: 436,377 km (0.114 R)
- M3: 584,628 km (0.085 R)
- M4: 720,164 km (0.058 R)
- M5: 916,137 km (0.111 R)
- M6: 1,377,497 km (0.05 R)
- M7: 1,581,848 km (0.114 R)
- M8: 1,672,654 km (0.046 R)
- M9: 1,972,448 km (0.117 R)
- M10: 2,187,719 km (0.093 R)
- M11: 2,588,043 km (0.117 R)
- M12: 2,732,854 km (0.1 R)
- M13: 2,843,257 km (0.109 R)
- M14: 3,378,818 km (0.106 R)
- M15: 3,537,690 km (0.077 R)
- M16: 4,326,520 km (0.07 R)
- M17: 4,630,802 km (0.042 R)
- M18: 4,719,065 km (0.114 R)
- M19: 5,009,733 km (0.118 R)
- M20: 5,168,906 km (0.108 R)
- M21: 5,632,509 km (0.079 R)
- M22: 5,774,328 km (0.072 R)
- M23: 5,893,408 km (0.068 R)
- M24: 6,109,876 km (0.081 R)
- M25: 6,206,816 km (0.098 R)
- M26: 6,625,091 km (0.113 R)
- M27: 6,774,839 km (0.082 R)
- M28: 6,900,651 km (0.095 R)
- M29: 7,077,924 km (0.075 R)
- M30: 7,908,043 km (0.078 R)
- M31: 8,988,738 km (0.114 R)
- M32: 9,210,442 km (0.115 R)
- M33: 9,687,809 km (0.119 R)
- M34: 10,086,936 km (0.04 R)
- M35: 10,288,444 km (0.114 R)
- M36: 10,637,306 km (0.096 R)
- M37: 11,138,010 km (0.08 R)
- M38: 11,496,148 km (0.107 R)
- M39: 11,646,493 km (0.114 R)
- M40: 12,132,088 km (0.039 R)
- M41: 12,285,276 km (0.118 R)
- M42: 12,562,481 km (0.078 R)
- M43: 12,904,163 km (0.083 R)
- M44: 12,997,811 km (0.107 R)
- M45: 13,186,005 km (0.095 R)
- M46: 13,469,792 km (0.067 R)
- M47: 13,660,230 km (0.099 R)
- M48: 14,075,813 km (0.055 R)
- M49: 14,756,035 km (0.118 R)
- M50: 16,047,513 km (0.047 R)
- M51: 16,148,342 km (0.099 R)
- M52: 16,316,939 km (0.039 R)
- M53: 16,757,953 km (0.081 R)
- M54: 16,894,387 km (0.112 R)
- M55: 17,444,159 km (0.092 R)
- M56: 17,790,628 km (0.092 R)
- M57: 17,964,759 km (0.104 R)
- M58: 18,279,663 km (0.086 R)
- M59: 19,199,540 km (0.08 R)
- M60: 19,521,625 km (0.106 R)
- M61: 19,845,354 km (0.119 R)
- M62: 19,953,663 km (0.077 R)
- M63: 20,425,345 km (0.059 R)
- M64: 20,607,705 km (0.094 R)
- M65: 21,121,275 km (0.109 R)
- M66: 21,453,681 km (0.094 R)
- M67: 21,601,933 km (0.11 R)
- M68: 21,974,132 km (0.045 R)
- M69: 22,123,580 km (0.099 R)
- M70: 22,461,223 km (0.06 R)
- M71: 24,367,698 km (0.096 R)
- M72: 25,261,994 km (0.115 R)
- M73: 26,008,936 km (0.062 R)
- M74: 26,127,418 km (0.035 R)
- M75: 26,404,922 km (0.09 R)
Asteroid Belt
Center: 6.34 AU
Composition
Type: Outer System (Icy)
A dense region of planetesimals and debris.
Boundary
Planet 5 - Gas Giant
Semi-Major Axis: 7.33 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 237.1
Radius: 10.6
Gravity: 2.11 G
Time & Orbit
Eccentricity (e): 0.016
Orbit Range: 7.21 AU - 7.45 AU
Year: 7322 Days
Day: 9.4 Hours
Environment
Temp: -165 °C
Axial Tilt: 28.3 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (75)
Outer Limit: 65,540,982 km
- M1: 141,370 km (0.034 R)
- M2: 417,976 km (0.111 R)
- M3: 603,627 km (0.109 R)
- M4: 724,502 km (0.043 R)
- M5: 806,033 km (0.043 R)
- M6: 1,097,450 km (0.051 R)
- M7: 1,220,719 km (0.036 R)
- M8: 1,334,263 km (0.079 R)
- M9: 1,496,428 km (0.034 R)
- M10: 1,712,447 km (0.12 R)
- M11: 2,261,770 km (0.114 R)
- M12: 2,456,696 km (0.102 R)
- M13: 2,675,708 km (0.092 R)
- M14: 3,035,640 km (0.052 R)
- M15: 3,614,883 km (0.077 R)
- M16: 3,759,843 km (0.106 R)
- M17: 4,141,467 km (0.058 R)
- M18: 4,358,983 km (0.117 R)
- M19: 4,535,658 km (0.071 R)
- M20: 4,782,644 km (0.088 R)
- M21: 5,289,781 km (0.119 R)
- M22: 5,886,826 km (0.117 R)
- M23: 6,057,816 km (0.106 R)
- M24: 6,379,900 km (0.084 R)
- M25: 6,733,101 km (0.072 R)
- M26: 6,912,020 km (0.068 R)
- M27: 7,015,093 km (0.073 R)
- M28: 7,353,334 km (0.077 R)
- M29: 7,991,817 km (0.108 R)
- M30: 8,731,429 km (0.11 R)
- M31: 9,896,049 km (0.062 R)
- M32: 10,070,629 km (0.118 R)
- M33: 10,158,294 km (0.108 R)
- M34: 10,511,494 km (0.069 R)
- M35: 10,659,746 km (0.113 R)
- M36: 11,381,556 km (0.098 R)
- M37: 11,472,960 km (0.052 R)
- M38: 11,717,702 km (0.119 R)
- M39: 11,809,854 km (0.104 R)
- M40: 12,368,453 km (0.111 R)
- M41: 12,493,666 km (0.085 R)
- M42: 12,903,864 km (0.111 R)
- M43: 12,999,157 km (0.116 R)
- M44: 13,190,343 km (0.079 R)
- M45: 13,478,918 km (0.093 R)
- M46: 13,997,274 km (0.073 R)
- M47: 14,555,125 km (0.115 R)
- M48: 14,787,002 km (0.063 R)
- M49: 16,237,802 km (0.089 R)
- M50: 16,719,956 km (0.118 R)
- M51: 16,789,219 km (0.12 R)
- M52: 17,206,747 km (0.068 R)
- M53: 17,276,759 km (0.103 R)
- M54: 17,733,631 km (0.109 R)
- M55: 18,016,670 km (0.057 R)
- M56: 18,194,392 km (0.04 R)
- M57: 20,113,883 km (0.097 R)
- M58: 20,187,634 km (0.107 R)
- M59: 20,966,740 km (0.112 R)
- M60: 21,755,719 km (0.107 R)
- M61: 21,945,110 km (0.098 R)
- M62: 22,516,275 km (0.03 R)
- M63: 22,631,016 km (0.116 R)
- M64: 23,324,103 km (0.039 R)
- M65: 23,867,891 km (0.046 R)
- M66: 23,945,982 km (0.064 R)
- M67: 24,573,395 km (0.09 R)
- M68: 25,166,401 km (0.064 R)
- M69: 26,084,932 km (0.031 R)
- M70: 26,165,266 km (0.082 R)
- M71: 26,407,016 km (0.112 R)
- M72: 26,568,582 km (0.081 R)
- M73: 26,730,297 km (0.049 R)
- M74: 27,177,146 km (0.102 R)
- M75: 27,258,677 km (0.088 R)
Planet 6 - Gas Giant
Semi-Major Axis: 7.66 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 540.8
Radius: 8.4
Gravity: 7.66 G
Time & Orbit
Eccentricity (e): 0.202
Orbit Range: 6.11 AU - 9.21 AU
Year: 7822 Days
Day: 9.3 Hours
Environment
Temp: -160 °C
Axial Tilt: 34.5 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (76)
Outer Limit: 65,540,982 km
- M1: 173,384 km (0.089 R)
- M2: 474,524 km (0.082 R)
- M3: 549,174 km (0.086 R)
- M4: 969,095 km (0.113 R)
- M5: 1,117,047 km (0.1 R)
- M6: 1,202,617 km (0.093 R)
- M7: 1,380,489 km (0.117 R)
- M8: 1,472,791 km (0.084 R)
- M9: 1,644,081 km (0.049 R)
- M10: 1,761,964 km (0.118 R)
- M11: 2,305,154 km (0.109 R)
- M12: 2,595,373 km (0.085 R)
- M13: 2,850,139 km (0.073 R)
- M14: 3,064,662 km (0.096 R)
- M15: 3,137,367 km (0.105 R)
- M16: 3,284,421 km (0.109 R)
- M17: 3,713,767 km (0.06 R)
- M18: 3,791,259 km (0.114 R)
- M19: 3,895,678 km (0.062 R)
- M20: 4,322,630 km (0.078 R)
- M21: 4,431,687 km (0.045 R)
- M22: 4,569,317 km (0.077 R)
- M23: 4,877,190 km (0.119 R)
- M24: 5,661,232 km (0.118 R)
- M25: 6,052,730 km (0.102 R)
- M26: 6,144,284 km (0.094 R)
- M27: 6,515,286 km (0.081 R)
- M28: 6,957,348 km (0.097 R)
- M29: 7,441,746 km (0.028 R)
- M30: 7,507,120 km (0.09 R)
- M31: 7,605,556 km (0.096 R)
- M32: 7,870,344 km (0.114 R)
- M33: 8,613,995 km (0.03 R)
- M34: 9,344,631 km (0.088 R)
- M35: 9,592,515 km (0.098 R)
- M36: 9,806,739 km (0.065 R)
- M37: 10,167,419 km (0.106 R)
- M38: 10,864,695 km (0.104 R)
- M39: 12,615,888 km (0.089 R)
- M40: 12,693,978 km (0.035 R)
- M41: 13,364,475 km (0.031 R)
- M42: 14,452,800 km (0.117 R)
- M43: 14,534,630 km (0.094 R)
- M44: 14,945,725 km (0.034 R)
- M45: 15,111,180 km (0.114 R)
- M46: 15,444,035 km (0.052 R)
- M47: 16,329,356 km (0.045 R)
- M48: 16,628,103 km (0.096 R)
- M49: 17,014,813 km (0.045 R)
- M50: 17,101,281 km (0.1 R)
- M51: 18,060,652 km (0.109 R)
- M52: 18,281,159 km (0.106 R)
- M53: 18,858,607 km (0.094 R)
- M54: 19,306,952 km (0.063 R)
- M55: 19,804,215 km (0.025 R)
- M56: 20,031,604 km (0.068 R)
- M57: 21,414,038 km (0.074 R)
- M58: 22,022,602 km (0.057 R)
- M59: 24,027,363 km (0.11 R)
- M60: 24,562,175 km (0.092 R)
- M61: 25,199,013 km (0.103 R)
- M62: 26,539,261 km (0.063 R)
- M63: 26,890,516 km (0.092 R)
- M64: 28,464,436 km (0.09 R)
- M65: 29,859,436 km (0.082 R)
- M66: 30,276,963 km (0.11 R)
- M67: 30,434,041 km (0.098 R)
- M68: 30,749,094 km (0.064 R)
- M69: 31,753,794 km (0.087 R)
- M70: 32,233,554 km (0.046 R)
- M71: 32,608,297 km (0.109 R)
- M72: 32,715,558 km (0.099 R)
- M73: 32,769,264 km (0.055 R)
- M74: 34,012,721 km (0.114 R)
- M75: 35,436,893 km (0.109 R)
- M76: 35,602,348 km (0.104 R)
Planet 7 - Gas Giant
Semi-Major Axis: 8.34 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 210.7
Radius: 11
Gravity: 1.74 G
Time & Orbit
Eccentricity (e): 0.136
Orbit Range: 7.21 AU - 9.47 AU
Year: 8886 Days
Day: 13.5 Hours
Environment
Temp: -173 °C
Axial Tilt: 11.9 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (78)
Outer Limit: 65,540,982 km
- M1: 150,645 km (0.053 R)
- M2: 233,971 km (0.084 R)
- M3: 541,993 km (0.101 R)
- M4: 699,968 km (0.034 R)
- M5: 861,534 km (0.096 R)
- M6: 967,599 km (0.119 R)
- M7: 1,036,115 km (0.079 R)
- M8: 1,120,937 km (0.051 R)
- M9: 1,358,947 km (0.081 R)
- M10: 1,713,045 km (0.101 R)
- M11: 1,849,030 km (0.117 R)
- M12: 2,150,320 km (0.089 R)
- M13: 2,241,874 km (0.032 R)
- M14: 2,372,473 km (0.117 R)
- M15: 2,544,211 km (0.09 R)
- M16: 2,621,852 km (0.113 R)
- M17: 2,719,988 km (0.074 R)
- M18: 3,042,821 km (0.029 R)
- M19: 3,250,762 km (0.114 R)
- M20: 4,267,130 km (0.12 R)
- M21: 4,360,030 km (0.111 R)
- M22: 4,571,262 km (0.051 R)
- M23: 4,761,999 km (0.042 R)
- M24: 5,225,603 km (0.085 R)
- M25: 5,400,034 km (0.077 R)
- M26: 5,576,410 km (0.118 R)
- M27: 6,012,787 km (0.115 R)
- M28: 6,222,075 km (0.102 R)
- M29: 6,782,767 km (0.094 R)
- M30: 7,303,966 km (0.062 R)
- M31: 7,639,963 km (0.101 R)
- M32: 8,327,066 km (0.085 R)
- M33: 8,884,917 km (0.106 R)
- M34: 9,882,735 km (0.068 R)
- M35: 10,347,984 km (0.084 R)
- M36: 10,567,594 km (0.101 R)
- M37: 10,725,419 km (0.103 R)
- M38: 11,364,501 km (0.092 R)
- M39: 12,279,891 km (0.086 R)
- M40: 12,379,373 km (0.086 R)
- M41: 12,712,977 km (0.05 R)
- M42: 12,813,656 km (0.046 R)
- M43: 13,015,763 km (0.11 R)
- M44: 13,117,190 km (0.063 R)
- M45: 13,286,834 km (0.093 R)
- M46: 13,389,009 km (0.025 R)
- M47: 14,250,394 km (0.052 R)
- M48: 14,811,236 km (0.066 R)
- M49: 15,094,276 km (0.035 R)
- M50: 15,165,335 km (0.11 R)
- M51: 15,629,986 km (0.111 R)
- M52: 15,954,463 km (0.096 R)
- M53: 16,135,626 km (0.116 R)
- M54: 16,244,683 km (0.114 R)
- M55: 16,390,392 km (0.105 R)
- M56: 16,903,961 km (0.088 R)
- M57: 17,422,916 km (0.094 R)
- M58: 19,087,791 km (0.116 R)
- M59: 20,251,812 km (0.114 R)
- M60: 21,678,826 km (0.096 R)
- M61: 22,323,443 km (0.119 R)
- M62: 22,526,148 km (0.074 R)
- M63: 23,015,333 km (0.05 R)
- M64: 23,302,262 km (0.065 R)
- M65: 23,425,531 km (0.087 R)
- M66: 24,045,464 km (0.096 R)
- M67: 24,336,582 km (0.106 R)
- M68: 24,628,896 km (0.081 R)
- M69: 25,386,011 km (0.051 R)
- M70: 25,894,943 km (0.043 R)
- M71: 26,150,605 km (0.044 R)
- M72: 26,793,577 km (0.094 R)
- M73: 27,268,401 km (0.04 R)
- M74: 27,659,001 km (0.116 R)
- M75: 28,007,863 km (0.098 R)
- M76: 28,226,575 km (0.073 R)
- M77: 28,753,758 km (0.051 R)
- M78: 29,284,232 km (0.119 R)
Planet 8 - Ice Giant
Semi-Major Axis: 14.01 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 467.8
Radius: 5.3
Gravity: 16.65 G
Time & Orbit
Eccentricity (e): 0.234
Orbit Range: 10.73 AU - 17.29 AU
Year: 19348 Days
Day: 20.8 Hours
Environment
Temp: -193 °C
Axial Tilt: 15.7 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (94)
Outer Limit: 65,540,982 km
- M1: 96,341 km (0.066 R)
- M2: 356,342 km (0.111 R)
- M3: 476,320 km (0.076 R)
- M4: 629,508 km (0.061 R)
- M5: 956,978 km (0.088 R)
- M6: 1,126,023 km (0.108 R)
- M7: 1,201,420 km (0.059 R)
- M8: 1,547,440 km (0.1 R)
- M9: 1,631,514 km (0.104 R)
- M10: 2,652,669 km (0.069 R)
- M11: 2,686,179 km (0.088 R)
- M12: 2,994,351 km (0.086 R)
- M13: 3,099,518 km (0.097 R)
- M14: 3,206,032 km (0.03 R)
- M15: 3,349,796 km (0.084 R)
- M16: 3,532,455 km (0.111 R)
- M17: 3,606,505 km (0.098 R)
- M18: 3,718,554 km (0.065 R)
- M19: 3,793,802 km (0.097 R)
- M20: 3,831,650 km (0.094 R)
- M21: 4,061,433 km (0.072 R)
- M22: 4,100,178 km (0.062 R)
- M23: 4,177,969 km (0.088 R)
- M24: 4,494,219 km (0.097 R)
- M25: 4,574,553 km (0.09 R)
- M26: 5,574,316 km (0.116 R)
- M27: 7,147,188 km (0.078 R)
- M28: 7,194,012 km (0.114 R)
- M29: 7,288,109 km (0.055 R)
- M30: 7,572,495 km (0.104 R)
- M31: 8,546,676 km (0.114 R)
- M32: 8,997,863 km (0.066 R)
- M33: 9,611,364 km (0.104 R)
- M34: 9,975,485 km (0.074 R)
- M35: 10,663,635 km (0.042 R)
- M36: 10,878,458 km (0.118 R)
- M37: 10,986,318 km (0.106 R)
- M38: 11,973,814 km (0.108 R)
- M39: 13,565,236 km (0.062 R)
- M40: 14,326,539 km (0.118 R)
- M41: 14,444,871 km (0.072 R)
- M42: 14,504,112 km (0.107 R)
- M43: 16,320,380 km (0.028 R)
- M44: 17,380,879 km (0.101 R)
- M45: 18,078,903 km (0.11 R)
- M46: 18,656,799 km (0.084 R)
- M47: 19,962,789 km (0.049 R)
- M48: 20,028,761 km (0.117 R)
- M49: 20,626,704 km (0.089 R)
- M50: 20,894,335 km (0.041 R)
- M51: 22,044,293 km (0.097 R)
- M52: 22,112,660 km (0.058 R)
- M53: 22,181,026 km (0.054 R)
- M54: 22,799,463 km (0.074 R)
- M55: 23,772,598 km (0.1 R)
- M56: 24,264,326 km (0.119 R)
- M57: 24,759,345 km (0.076 R)
- M58: 24,972,522 km (0.093 R)
- M59: 25,186,298 km (0.057 R)
- M60: 25,329,163 km (0.039 R)
- M61: 26,192,044 km (0.082 R)
- M62: 29,738,411 km (0.103 R)
- M63: 31,798,374 km (0.12 R)
- M64: 32,262,426 km (0.079 R)
- M65: 33,667,749 km (0.108 R)
- M66: 34,536,464 km (0.095 R)
- M67: 35,252,589 km (0.084 R)
- M68: 36,054,134 km (0.116 R)
- M69: 37,838,388 km (0.117 R)
- M70: 38,906,217 km (0.065 R)
- M71: 39,485,311 km (0.116 R)
- M72: 40,903,499 km (0.027 R)
- M73: 41,408,092 km (0.106 R)
- M74: 41,914,631 km (0.095 R)
- M75: 42,678,328 km (0.069 R)
- M76: 43,875,410 km (0.095 R)
- M77: 44,564,458 km (0.079 R)
- M78: 45,256,946 km (0.112 R)
- M79: 45,953,175 km (0.079 R)
- M80: 46,828,173 km (0.051 R)
- M81: 46,915,987 km (0.095 R)
- M82: 47,179,877 km (0.115 R)
- M83: 49,129,287 km (0.084 R)
- M84: 51,014,370 km (0.102 R)
- M85: 53,014,643 km (0.09 R)
- M86: 56,249,248 km (0.104 R)
- M87: 56,903,888 km (0.073 R)
- M88: 58,220,499 km (0.059 R)
- M89: 58,977,315 km (0.055 R)
- M90: 59,832,716 km (0.103 R)
- M91: 60,023,453 km (0.062 R)
- M92: 60,979,682 km (0.109 R)
- M93: 61,940,998 km (0.066 R)
- M94: 64,561,355 km (0.114 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: 246 - 11,173 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.