G5V Star System Generated (Seed: 1766811248)
Star Details
Spectral Class: G4V
Temperature: 5,680 K
Mass: 1.02 sol
Luminosity: 1.07 lux
Habitable Zone (HZ)
Inner Boundary: 0.99 AU
Outer Boundary: 1.42 AU
Physical Limits
Snow Line: 4.97 AU
Max System Radius: 20.2 AU
Planetary System (8 Planets)
Planet 1 - Terrestrial
Semi-Major Axis: 0.86 AU
Status: Inner (Hot)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 4.28
Radius: 1.79
Gravity: 1.34 G
Time & Orbit
Eccentricity (e): 0.005
Orbit Range: 0.86 AU - 0.86 AU
Year: 288 Days
Day: 14.3 Hours
Environment
Temp: 96 °C
Axial Tilt: 7.5 °
Atmosphere: Dense COâ‚‚
Biome: Volcanic/Barren
Satellites (1)
Outer Limit: 39,966,237 km
- M1: 42,037 km (0.112 R)
Planet 2 - Terrestrial
Semi-Major Axis: 2.42 AU
Status: Outer (Cold)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 3.48
Radius: 1.65
Gravity: 1.28 G
Time & Orbit
Eccentricity (e): 0.25
Orbit Range: 1.82 AU - 3.03 AU
Year: 1361 Days
Day: 27 Hours
Environment
Temp: -73 °C
Axial Tilt: 24 °
Atmosphere: Thin Nâ‚‚/CHâ‚„
Biome: Ice Cap/Desert
Planet 3 - Terrestrial
Semi-Major Axis: 3.09 AU
Status: Outer (Cold)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 2.63
Radius: 1.47
Gravity: 1.22 G
Time & Orbit
Eccentricity (e): 0.015
Orbit Range: 3.04 AU - 3.14 AU
Year: 1964 Days
Day: 36 Hours
Environment
Temp: -100 °C
Axial Tilt: 2.4 °
Atmosphere: Thin Nâ‚‚/CHâ‚„
Biome: Ice Cap/Desert
Satellites (1)
Outer Limit: 39,966,237 km
- M1: 2,387,732 km (0.109 R)
Planet 4 - Gas Giant
Semi-Major Axis: 5.22 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 637.5
Radius: 8.1
Gravity: 9.72 G
Time & Orbit
Eccentricity (e): 0.191
Orbit Range: 4.22 AU - 6.22 AU
Year: 4313 Days
Day: 12 Hours
Environment
Temp: -148 °C
Axial Tilt: 48.8 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (79)
Outer Limit: 39,966,237 km
- M1: 193,580 km (0.1 R)
- M2: 346,319 km (0.11 R)
- M3: 472,430 km (0.059 R)
- M4: 541,843 km (0.097 R)
- M5: 593,604 km (0.055 R)
- M6: 737,069 km (0.071 R)
- M7: 807,380 km (0.041 R)
- M8: 980,464 km (0.109 R)
- M9: 1,125,126 km (0.099 R)
- M10: 1,248,843 km (0.11 R)
- M11: 1,305,241 km (0.086 R)
- M12: 1,435,541 km (0.115 R)
- M13: 1,982,770 km (0.068 R)
- M14: 2,201,333 km (0.092 R)
- M15: 2,499,032 km (0.084 R)
- M16: 2,661,945 km (0.099 R)
- M17: 2,865,846 km (0.107 R)
- M18: 2,922,245 km (0.078 R)
- M19: 3,017,239 km (0.096 R)
- M20: 3,113,281 km (0.116 R)
- M21: 3,752,064 km (0.111 R)
- M22: 4,171,387 km (0.1 R)
- M23: 4,452,182 km (0.092 R)
- M24: 4,605,819 km (0.063 R)
- M25: 5,100,240 km (0.082 R)
- M26: 5,261,208 km (0.117 R)
- M27: 5,330,621 km (0.061 R)
- M28: 5,682,625 km (0.118 R)
- M29: 5,801,705 km (0.037 R)
- M30: 5,969,703 km (0.115 R)
- M31: 6,139,347 km (0.083 R)
- M32: 6,359,705 km (0.095 R)
- M33: 6,985,772 km (0.055 R)
- M34: 7,087,798 km (0.088 R)
- M35: 8,404,109 km (0.1 R)
- M36: 8,703,754 km (0.098 R)
- M37: 8,841,085 km (0.111 R)
- M38: 8,896,286 km (0.086 R)
- M39: 9,006,839 km (0.066 R)
- M40: 9,369,614 km (0.105 R)
- M41: 9,623,631 km (0.085 R)
- M42: 9,994,335 km (0.112 R)
- M43: 10,167,120 km (0.095 R)
- M44: 10,457,190 km (0.109 R)
- M45: 10,544,705 km (0.094 R)
- M46: 10,632,519 km (0.093 R)
- M47: 11,554,042 km (0.061 R)
- M48: 11,614,479 km (0.105 R)
- M49: 11,796,091 km (0.112 R)
- M50: 11,978,601 km (0.102 R)
- M51: 12,192,825 km (0.054 R)
- M52: 12,780,595 km (0.099 R)
- M53: 13,377,640 km (0.09 R)
- M54: 13,504,499 km (0.105 R)
- M55: 13,568,078 km (0.063 R)
- M56: 13,791,278 km (0.095 R)
- M57: 14,176,941 km (0.1 R)
- M58: 14,241,568 km (0.073 R)
- M59: 14,306,344 km (0.05 R)
- M60: 15,421,446 km (0.074 R)
- M61: 15,521,228 km (0.119 R)
- M62: 17,214,825 km (0.102 R)
- M63: 17,352,904 km (0.088 R)
- M64: 17,873,654 km (0.083 R)
- M65: 18,013,528 km (0.072 R)
- M66: 18,294,024 km (0.09 R)
- M67: 18,540,861 km (0.051 R)
- M68: 18,611,471 km (0.071 R)
- M69: 19,682,741 km (0.112 R)
- M70: 20,627,153 km (0.073 R)
- M71: 20,884,012 km (0.096 R)
- M72: 20,994,416 km (0.118 R)
- M73: 21,363,773 km (0.099 R)
- M74: 21,474,924 km (0.068 R)
- M75: 21,959,172 km (0.114 R)
- M76: 23,777,983 km (0.115 R)
- M77: 24,047,259 km (0.044 R)
- M78: 24,201,644 km (0.106 R)
- M79: 24,978,207 km (0.084 R)
Planet 5 - Gas Giant
Semi-Major Axis: 6.61 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 938.2
Radius: 14.6
Gravity: 4.4 G
Time & Orbit
Eccentricity (e): 0.031
Orbit Range: 6.41 AU - 6.81 AU
Year: 6146 Days
Day: 13.6 Hours
Environment
Temp: -144 °C
Axial Tilt: 45 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (78)
Outer Limit: 39,966,237 km
- M1: 191,186 km (0.034 R)
- M2: 421,716 km (0.112 R)
- M3: 584,329 km (0.06 R)
- M4: 787,184 km (0.051 R)
- M5: 1,164,320 km (0.119 R)
- M6: 1,302,997 km (0.067 R)
- M7: 1,410,858 km (0.101 R)
- M8: 1,617,003 km (0.032 R)
- M9: 1,955,992 km (0.113 R)
- M10: 2,166,327 km (0.047 R)
- M11: 3,106,250 km (0.058 R)
- M12: 3,378,518 km (0.115 R)
- M13: 3,607,104 km (0.119 R)
- M14: 3,946,392 km (0.069 R)
- M15: 4,106,611 km (0.115 R)
- M16: 4,351,054 km (0.096 R)
- M17: 5,055,211 km (0.103 R)
- M18: 5,200,471 km (0.099 R)
- M19: 5,317,606 km (0.079 R)
- M20: 5,614,408 km (0.12 R)
- M21: 5,886,227 km (0.105 R)
- M22: 7,343,011 km (0.108 R)
- M23: 7,474,807 km (0.053 R)
- M24: 7,673,922 km (0.058 R)
- M25: 8,661,567 km (0.091 R)
- M26: 8,835,998 km (0.091 R)
- M27: 9,259,211 km (0.112 R)
- M28: 10,309,537 km (0.109 R)
- M29: 10,494,440 km (0.062 R)
- M30: 11,093,580 km (0.115 R)
- M31: 12,443,102 km (0.091 R)
- M32: 15,378,811 km (0.089 R)
- M33: 16,230,920 km (0.088 R)
- M34: 16,576,042 km (0.118 R)
- M35: 16,749,576 km (0.083 R)
- M36: 17,405,563 km (0.091 R)
- M37: 17,670,351 km (0.09 R)
- M38: 17,803,194 km (0.09 R)
- M39: 18,025,347 km (0.116 R)
- M40: 18,338,006 km (0.074 R)
- M41: 18,472,644 km (0.086 R)
- M42: 19,423,638 km (0.044 R)
- M43: 19,790,153 km (0.085 R)
- M44: 20,530,064 km (0.096 R)
- M45: 21,609,562 km (0.116 R)
- M46: 22,227,850 km (0.082 R)
- M47: 23,530,548 km (0.072 R)
- M48: 24,166,788 km (0.098 R)
- M49: 24,511,611 km (0.112 R)
- M50: 26,462,816 km (0.114 R)
- M51: 27,277,676 km (0.059 R)
- M52: 27,945,780 km (0.062 R)
- M53: 28,100,763 km (0.096 R)
- M54: 28,307,807 km (0.113 R)
- M55: 28,411,628 km (0.109 R)
- M56: 28,671,479 km (0.087 R)
- M57: 29,718,814 km (0.102 R)
- M58: 30,353,258 km (0.083 R)
- M59: 30,618,944 km (0.11 R)
- M60: 30,831,972 km (0.115 R)
- M61: 31,259,672 km (0.079 R)
- M62: 31,420,639 km (0.103 R)
- M63: 31,528,050 km (0.029 R)
- M64: 31,958,892 km (0.106 R)
- M65: 32,066,902 km (0.087 R)
- M66: 32,391,679 km (0.099 R)
- M67: 32,717,653 km (0.052 R)
- M68: 32,881,014 km (0.081 R)
- M69: 33,044,524 km (0.113 R)
- M70: 33,921,916 km (0.038 R)
- M71: 34,640,285 km (0.083 R)
- M72: 34,751,286 km (0.106 R)
- M73: 35,252,140 km (0.1 R)
- M74: 35,643,338 km (0.086 R)
- M75: 35,867,585 km (0.042 R)
- M76: 36,373,825 km (0.102 R)
- M77: 36,486,621 km (0.08 R)
- M78: 37,735,165 km (0.078 R)
Planet 6 - Gas Giant
Semi-Major Axis: 8.01 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 328.6
Radius: 8.8
Gravity: 4.24 G
Time & Orbit
Eccentricity (e): 0.012
Orbit Range: 7.91 AU - 8.11 AU
Year: 8199 Days
Day: 6 Hours
Environment
Temp: -165 °C
Axial Tilt: 34.9 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (86)
Outer Limit: 39,966,237 km
- M1: 175,777 km (0.063 R)
- M2: 238,908 km (0.055 R)
- M3: 323,879 km (0.104 R)
- M4: 520,451 km (0.096 R)
- M5: 690,394 km (0.051 R)
- M6: 1,008,738 km (0.085 R)
- M7: 1,304,643 km (0.095 R)
- M8: 1,488,349 km (0.106 R)
- M9: 1,734,438 km (0.115 R)
- M10: 1,899,594 km (0.115 R)
- M11: 1,993,541 km (0.118 R)
- M12: 2,108,582 km (0.05 R)
- M13: 2,225,717 km (0.091 R)
- M14: 2,285,107 km (0.08 R)
- M15: 2,952,015 km (0.089 R)
- M16: 3,536,045 km (0.096 R)
- M17: 3,675,919 km (0.037 R)
- M18: 4,033,607 km (0.118 R)
- M19: 4,106,462 km (0.105 R)
- M20: 4,427,499 km (0.12 R)
- M21: 4,807,926 km (0.048 R)
- M22: 6,095,216 km (0.094 R)
- M23: 6,235,239 km (0.076 R)
- M24: 6,518,278 km (0.101 R)
- M25: 6,604,148 km (0.12 R)
- M26: 8,118,826 km (0.048 R)
- M27: 8,180,460 km (0.115 R)
- M28: 8,490,427 km (0.091 R)
- M29: 8,772,718 km (0.073 R)
- M30: 9,573,067 km (0.1 R)
- M31: 9,670,754 km (0.083 R)
- M32: 9,735,979 km (0.066 R)
- M33: 10,363,243 km (0.071 R)
- M34: 10,463,623 km (0.041 R)
- M35: 11,037,780 km (0.092 R)
- M36: 11,345,951 km (0.105 R)
- M37: 11,449,323 km (0.099 R)
- M38: 11,726,379 km (0.104 R)
- M39: 12,393,436 km (0.061 R)
- M40: 12,642,366 km (0.063 R)
- M41: 13,581,243 km (0.078 R)
- M42: 13,837,803 km (0.066 R)
- M43: 14,207,160 km (0.093 R)
- M44: 14,355,860 km (0.048 R)
- M45: 14,467,610 km (0.081 R)
- M46: 14,617,208 km (0.096 R)
- M47: 14,955,598 km (0.078 R)
- M48: 15,258,534 km (0.097 R)
- M49: 16,568,712 km (0.09 R)
- M50: 17,515,218 km (0.091 R)
- M51: 17,834,609 km (0.052 R)
- M52: 17,954,736 km (0.028 R)
- M53: 18,763,463 km (0.057 R)
- M54: 19,708,023 km (0.059 R)
- M55: 20,541,882 km (0.111 R)
- M56: 20,667,993 km (0.046 R)
- M57: 21,302,288 km (0.077 R)
- M58: 21,387,260 km (0.093 R)
- M59: 21,600,437 km (0.116 R)
- M60: 22,157,838 km (0.078 R)
- M61: 22,373,558 km (0.072 R)
- M62: 23,330,835 km (0.095 R)
- M63: 23,550,146 km (0.093 R)
- M64: 23,814,335 km (0.05 R)
- M65: 24,256,996 km (0.056 R)
- M66: 24,791,509 km (0.102 R)
- M67: 25,420,119 km (0.115 R)
- M68: 25,600,684 km (0.082 R)
- M69: 26,784,900 km (0.035 R)
- M70: 27,060,609 km (0.114 R)
- M71: 27,337,365 km (0.106 R)
- M72: 27,754,295 km (0.09 R)
- M73: 28,079,969 km (0.094 R)
- M74: 28,453,665 km (0.099 R)
- M75: 28,735,058 km (0.025 R)
- M76: 29,206,142 km (0.105 R)
- M77: 29,584,924 km (0.101 R)
- M78: 29,727,341 km (0.108 R)
- M79: 29,965,201 km (0.111 R)
- M80: 30,251,532 km (0.058 R)
- M81: 30,586,631 km (0.049 R)
- M82: 31,454,299 km (0.03 R)
- M83: 31,599,558 km (0.058 R)
- M84: 31,696,647 km (0.06 R)
- M85: 32,574,488 km (0.069 R)
- M86: 32,868,896 km (0.09 R)
Planet 7 - Gas Giant
Semi-Major Axis: 10.85 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 241.5
Radius: 8.3
Gravity: 3.51 G
Time & Orbit
Eccentricity (e): 0.101
Orbit Range: 9.75 AU - 11.95 AU
Year: 12925 Days
Day: 13.7 Hours
Environment
Temp: -179 °C
Axial Tilt: 13.1 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (68)
Outer Limit: 39,966,237 km
- M1: 126,709 km (0.085 R)
- M2: 252,222 km (0.105 R)
- M3: 435,928 km (0.102 R)
- M4: 845,378 km (0.11 R)
- M5: 910,004 km (0.068 R)
- M6: 1,149,360 km (0.098 R)
- M7: 1,525,599 km (0.079 R)
- M8: 1,769,144 km (0.072 R)
- M9: 2,315,925 km (0.102 R)
- M10: 2,789,252 km (0.068 R)
- M11: 3,580,775 km (0.103 R)
- M12: 6,329,486 km (0.107 R)
- M13: 6,589,786 km (0.084 R)
- M14: 7,873,785 km (0.073 R)
- M15: 8,365,812 km (0.08 R)
- M16: 8,795,607 km (0.047 R)
- M17: 9,602,239 km (0.096 R)
- M18: 9,976,682 km (0.118 R)
- M19: 10,470,654 km (0.118 R)
- M20: 11,403,397 km (0.097 R)
- M21: 11,680,452 km (0.079 R)
- M22: 12,403,010 km (0.119 R)
- M23: 12,647,154 km (0.079 R)
- M24: 14,017,919 km (0.107 R)
- M25: 14,272,086 km (0.092 R)
- M26: 14,656,403 km (0.119 R)
- M27: 14,742,272 km (0.076 R)
- M28: 14,871,375 km (0.112 R)
- M29: 14,957,693 km (0.114 R)
- M30: 15,522,574 km (0.068 R)
- M31: 17,213,479 km (0.037 R)
- M32: 17,440,269 km (0.069 R)
- M33: 18,450,055 km (0.108 R)
- M34: 19,290,346 km (0.105 R)
- M35: 21,104,819 km (0.034 R)
- M36: 21,493,773 km (0.052 R)
- M37: 21,591,311 km (0.104 R)
- M38: 22,032,326 km (0.115 R)
- M39: 22,476,332 km (0.064 R)
- M40: 23,172,860 km (0.098 R)
- M41: 23,272,941 km (0.061 R)
- M42: 23,624,346 km (0.05 R)
- M43: 23,977,547 km (0.111 R)
- M44: 25,510,925 km (0.097 R)
- M45: 26,550,780 km (0.092 R)
- M46: 26,708,007 km (0.101 R)
- M47: 28,510,661 km (0.094 R)
- M48: 30,297,608 km (0.115 R)
- M49: 30,901,385 km (0.087 R)
- M50: 31,177,094 km (0.107 R)
- M51: 31,232,295 km (0.115 R)
- M52: 31,731,055 km (0.078 R)
- M53: 33,299,140 km (0.099 R)
- M54: 33,355,538 km (0.096 R)
- M55: 33,412,086 km (0.094 R)
- M56: 33,581,880 km (0.111 R)
- M57: 34,491,734 km (0.108 R)
- M58: 34,949,653 km (0.085 R)
- M59: 35,121,990 km (0.075 R)
- M60: 35,756,135 km (0.05 R)
- M61: 35,871,774 km (0.045 R)
- M62: 36,103,501 km (0.088 R)
- M63: 36,277,633 km (0.111 R)
- M64: 37,093,989 km (0.08 R)
- M65: 38,093,452 km (0.05 R)
- M66: 38,389,207 km (0.054 R)
- M67: 39,459,730 km (0.112 R)
- M68: 39,818,764 km (0.094 R)
Planet 8 - Gas Giant
Semi-Major Axis: 11.64 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 192.5
Radius: 8.9
Gravity: 2.43 G
Time & Orbit
Eccentricity (e): 0.145
Orbit Range: 9.95 AU - 13.33 AU
Year: 14362 Days
Day: 6.4 Hours
Environment
Temp: -172 °C
Axial Tilt: 5.9 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (88)
Outer Limit: 39,966,237 km
- M1: 114,293 km (0.09 R)
- M2: 277,803 km (0.108 R)
- M3: 681,867 km (0.038 R)
- M4: 755,918 km (0.087 R)
- M5: 896,839 km (0.064 R)
- M6: 1,046,587 km (0.099 R)
- M7: 1,151,156 km (0.098 R)
- M8: 1,296,116 km (0.098 R)
- M9: 1,352,215 km (0.025 R)
- M10: 1,409,062 km (0.115 R)
- M11: 1,525,300 km (0.044 R)
- M12: 2,198,490 km (0.099 R)
- M13: 2,472,554 km (0.087 R)
- M14: 2,855,075 km (0.113 R)
- M15: 3,078,575 km (0.093 R)
- M16: 4,535,658 km (0.11 R)
- M17: 4,767,535 km (0.104 R)
- M18: 4,855,348 km (0.094 R)
- M19: 5,333,613 km (0.062 R)
- M20: 6,015,779 km (0.12 R)
- M21: 6,110,923 km (0.116 R)
- M22: 6,464,124 km (0.101 R)
- M23: 6,561,662 km (0.09 R)
- M24: 6,692,410 km (0.103 R)
- M25: 6,890,179 km (0.083 R)
- M26: 8,152,037 km (0.038 R)
- M27: 9,446,806 km (0.117 R)
- M28: 9,780,410 km (0.112 R)
- M29: 10,804,407 km (0.097 R)
- M30: 10,881,600 km (0.073 R)
- M31: 11,387,988 km (0.05 R)
- M32: 11,624,353 km (0.081 R)
- M33: 12,222,146 km (0.093 R)
- M34: 12,789,122 km (0.116 R)
- M35: 13,447,652 km (0.029 R)
- M36: 14,033,028 km (0.038 R)
- M37: 14,498,726 km (0.117 R)
- M38: 15,358,465 km (0.04 R)
- M39: 15,488,765 km (0.08 R)
- M40: 16,102,116 km (0.101 R)
- M41: 16,456,215 km (0.117 R)
- M42: 16,678,816 km (0.056 R)
- M43: 16,902,315 km (0.095 R)
- M44: 17,171,891 km (0.047 R)
- M45: 17,579,096 km (0.119 R)
- M46: 17,852,262 km (0.079 R)
- M47: 18,912,462 km (0.081 R)
- M48: 19,803,617 km (0.118 R)
- M49: 20,135,275 km (0.089 R)
- M50: 20,373,435 km (0.056 R)
- M51: 21,189,940 km (0.119 R)
- M52: 21,529,228 km (0.052 R)
- M53: 21,675,235 km (0.077 R)
- M54: 22,508,645 km (0.052 R)
- M55: 22,706,264 km (0.116 R)
- M56: 23,153,113 km (0.08 R)
- M57: 23,402,493 km (0.054 R)
- M58: 23,954,509 km (0.106 R)
- M59: 24,816,043 km (0.097 R)
- M60: 25,122,419 km (0.118 R)
- M61: 25,378,830 km (0.103 R)
- M62: 26,673,600 km (0.12 R)
- M63: 26,778,168 km (0.111 R)
- M64: 27,777,781 km (0.061 R)
- M65: 28,735,956 km (0.026 R)
- M66: 29,273,012 km (0.078 R)
- M67: 29,434,877 km (0.104 R)
- M68: 29,813,360 km (0.051 R)
- M69: 30,630,164 km (0.08 R)
- M70: 31,178,739 km (0.09 R)
- M71: 31,399,097 km (0.109 R)
- M72: 31,509,500 km (0.118 R)
- M73: 31,730,606 km (0.074 R)
- M74: 32,397,064 km (0.076 R)
- M75: 33,687,197 km (0.055 R)
- M76: 33,856,840 km (0.076 R)
- M77: 34,139,880 km (0.115 R)
- M78: 34,367,119 km (0.081 R)
- M79: 34,822,794 km (0.08 R)
- M80: 34,879,940 km (0.108 R)
- M81: 36,781,928 km (0.118 R)
- M82: 37,073,045 km (0.114 R)
- M83: 37,657,524 km (0.079 R)
- M84: 37,774,809 km (0.104 R)
- M85: 38,245,144 km (0.11 R)
- M86: 38,540,151 km (0.104 R)
- M87: 38,658,334 km (0.099 R)
- M88: 38,835,757 km (0.101 R)
Kuiper Belt
Range: 30.3 - 52.3 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 432 - 17,755 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.