Star System Generated (Seed: 1768470811)
Star Details
Spectral Class: M1V
Temperature: 3,483 K
Mass: 0.32 sol
Luminosity: 0.02 lux
Habitable Zone (HZ)
Inner Boundary: 0.13 AU
Outer Boundary: 0.19 AU
Physical Limits
Snow Line: 0.68 AU
Max System Radius: 11.3 AU
Planetary System (7 Planets)
Planet 1 - Terrestrial
Semi-Major Axis: 0.54 AU
Status: Outer (Cold)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 2.03
Radius: 1.33
Gravity: 1.15 G
Time & Orbit
Eccentricity (e): 0.082
Orbit Range: 0.5 AU - 0.58 AU
Year: 256 Days
Day: 19.3 Hours
Environment
Temp: -114 °C
Axial Tilt: 28.6 °
Atmosphere: Thin Nâ‚‚/CHâ‚„
Biome: Ice Cap/Desert
Satellites (1)
Outer Limit: 71,039,664 km
- M1: 329,714 km (0.084 R)
Planet 2 - Gas Giant
Semi-Major Axis: 1.01 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 27.5
Radius: 10.8
Gravity: 0.24 G
Time & Orbit
Eccentricity (e): 0.189
Orbit Range: 0.82 AU - 1.2 AU
Year: 655 Days
Day: 14.3 Hours
Environment
Temp: -150 °C
Axial Tilt: 38.2 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (23)
Outer Limit: 71,039,664 km
- M1: 136,882 km (0.115 R)
- M2: 236,963 km (0.1 R)
- M3: 311,912 km (0.11 R)
- M4: 411,993 km (0.089 R)
- M5: 481,855 km (0.095 R)
- M6: 584,329 km (0.102 R)
- M7: 697,575 km (0.113 R)
- M8: 819,048 km (0.076 R)
- M9: 955,930 km (0.094 R)
- M10: 1,032,824 km (0.063 R)
- M11: 1,196,035 km (0.117 R)
- M12: 1,276,668 km (0.116 R)
- M13: 1,359,246 km (0.041 R)
- M14: 1,567,636 km (0.071 R)
- M15: 1,669,363 km (0.04 R)
- M16: 1,766,751 km (0.106 R)
- M17: 1,839,605 km (0.093 R)
- M18: 1,923,529 km (0.114 R)
- M19: 2,046,648 km (0.116 R)
- M20: 2,308,445 km (0.101 R)
- M21: 2,395,660 km (0.112 R)
- M22: 2,506,363 km (0.107 R)
- M23: 2,596,121 km (0.117 R)
Planet 3 - Gas Giant
Semi-Major Axis: 1.42 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 60.6
Radius: 8.5
Gravity: 0.84 G
Time & Orbit
Eccentricity (e): 0.092
Orbit Range: 1.29 AU - 1.55 AU
Year: 1093 Days
Day: 12.2 Hours
Environment
Temp: -178 °C
Axial Tilt: 15.5 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (38)
Outer Limit: 71,039,664 km
- M1: 112,797 km (0.04 R)
- M2: 207,791 km (0.107 R)
- M3: 284,685 km (0.117 R)
- M4: 485,744 km (0.09 R)
- M5: 552,166 km (0.076 R)
- M6: 629,059 km (0.106 R)
- M7: 764,595 km (0.091 R)
- M8: 828,473 km (0.109 R)
- M9: 1,081,892 km (0.083 R)
- M10: 1,167,462 km (0.082 R)
- M11: 1,246,449 km (0.105 R)
- M12: 1,424,172 km (0.119 R)
- M13: 1,494,782 km (0.117 R)
- M14: 1,610,122 km (0.109 R)
- M15: 1,829,732 km (0.107 R)
- M16: 1,922,333 km (0.111 R)
- M17: 1,984,865 km (0.099 R)
- M18: 2,048,294 km (0.076 R)
- M19: 2,112,322 km (0.062 R)
- M20: 2,209,710 km (0.065 R)
- M21: 2,465,373 km (0.068 R)
- M22: 2,550,793 km (0.078 R)
- M23: 2,625,592 km (0.045 R)
- M24: 2,962,636 km (0.102 R)
- M25: 3,047,608 km (0.12 R)
- M26: 3,121,060 km (0.067 R)
- M27: 3,307,310 km (0.061 R)
- M28: 3,420,705 km (0.097 R)
- M29: 3,736,356 km (0.113 R)
- M30: 3,821,627 km (0.079 R)
- M31: 3,987,681 km (0.065 R)
- M32: 4,054,701 km (0.109 R)
- M33: 4,122,020 km (0.027 R)
- M34: 4,196,669 km (0.072 R)
- M35: 4,340,433 km (0.084 R)
- M36: 4,660,871 km (0.102 R)
- M37: 4,724,450 km (0.063 R)
- M38: 4,874,048 km (0.081 R)
Planet 4 - Gas Giant
Semi-Major Axis: 2.57 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 420.8
Radius: 13.4
Gravity: 2.34 G
Time & Orbit
Eccentricity (e): 0.162
Orbit Range: 2.15 AU - 2.99 AU
Year: 2660 Days
Day: 5.3 Hours
Environment
Temp: -195 °C
Axial Tilt: 27.6 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (67)
Outer Limit: 71,039,664 km
- M1: 180,864 km (0.074 R)
- M2: 358,885 km (0.086 R)
- M3: 469,139 km (0.112 R)
- M4: 594,801 km (0.105 R)
- M5: 718,219 km (0.05 R)
- M6: 921,972 km (0.103 R)
- M7: 1,040,752 km (0.114 R)
- M8: 1,254,677 km (0.098 R)
- M9: 1,647,970 km (0.112 R)
- M10: 1,749,697 km (0.078 R)
- M11: 1,865,186 km (0.07 R)
- M12: 2,116,361 km (0.116 R)
- M13: 2,202,679 km (0.083 R)
- M14: 2,612,577 km (0.088 R)
- M15: 3,005,272 km (0.097 R)
- M16: 3,187,332 km (0.09 R)
- M17: 3,301,326 km (0.041 R)
- M18: 3,416,815 km (0.043 R)
- M19: 3,518,841 km (0.084 R)
- M20: 3,651,684 km (0.107 R)
- M21: 4,014,010 km (0.076 R)
- M22: 4,137,578 km (0.093 R)
- M23: 4,340,881 km (0.11 R)
- M24: 4,660,273 km (0.109 R)
- M25: 4,970,838 km (0.08 R)
- M26: 5,103,681 km (0.065 R)
- M27: 5,803,051 km (0.114 R)
- M28: 5,890,416 km (0.079 R)
- M29: 6,013,535 km (0.075 R)
- M30: 6,244,365 km (0.071 R)
- M31: 6,333,974 km (0.036 R)
- M32: 6,442,133 km (0.041 R)
- M33: 6,550,891 km (0.113 R)
- M34: 6,660,097 km (0.106 R)
- M35: 6,806,853 km (0.051 R)
- M36: 7,029,006 km (0.079 R)
- M37: 7,234,852 km (0.094 R)
- M38: 7,575,935 km (0.073 R)
- M39: 7,883,509 km (0.087 R)
- M40: 8,530,968 km (0.107 R)
- M41: 8,690,589 km (0.082 R)
- M42: 9,544,643 km (0.045 R)
- M43: 9,668,810 km (0.042 R)
- M44: 9,877,050 km (0.085 R)
- M45: 10,044,749 km (0.083 R)
- M46: 10,255,682 km (0.107 R)
- M47: 10,596,167 km (0.114 R)
- M48: 11,027,158 km (0.063 R)
- M49: 11,398,011 km (0.105 R)
- M50: 11,507,816 km (0.089 R)
- M51: 11,928,485 km (0.043 R)
- M52: 12,331,801 km (0.098 R)
- M53: 12,693,978 km (0.105 R)
- M54: 13,382,726 km (0.065 R)
- M55: 13,521,852 km (0.113 R)
- M56: 13,825,087 km (0.102 R)
- M57: 14,059,956 km (0.061 R)
- M58: 14,581,155 km (0.101 R)
- M59: 15,012,446 km (0.094 R)
- M60: 15,545,164 km (0.096 R)
- M61: 15,740,389 km (0.116 R)
- M62: 15,838,375 km (0.086 R)
- M63: 16,010,263 km (0.038 R)
- M64: 16,256,950 km (0.112 R)
- M65: 16,455,167 km (0.104 R)
- M66: 16,629,299 km (0.042 R)
- M67: 16,829,012 km (0.098 R)
Planet 5 - Ice Giant
Semi-Major Axis: 7.61 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 836.8
Radius: 3
Gravity: 92.98 G
Time & Orbit
Eccentricity (e): 0.071
Orbit Range: 7.07 AU - 8.15 AU
Year: 13555 Days
Day: 17.6 Hours
Environment
Temp: -220 °C
Axial Tilt: 35.3 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (95)
Outer Limit: 71,039,664 km
- M1: 130,300 km (0.025 R)
- M2: 300,243 km (0.1 R)
- M3: 1,223,860 km (0.088 R)
- M4: 1,351,467 km (0.072 R)
- M5: 1,456,485 km (0.1 R)
- M6: 1,873,863 km (0.113 R)
- M7: 2,020,768 km (0.108 R)
- M8: 2,140,895 km (0.112 R)
- M9: 2,483,325 km (0.065 R)
- M10: 2,644,591 km (0.079 R)
- M11: 2,776,088 km (0.047 R)
- M12: 3,011,106 km (0.068 R)
- M13: 3,113,880 km (0.102 R)
- M14: 3,608,450 km (0.034 R)
- M15: 3,644,653 km (0.082 R)
- M16: 4,126,956 km (0.067 R)
- M17: 4,550,468 km (0.109 R)
- M18: 4,707,845 km (0.061 R)
- M19: 4,947,351 km (0.048 R)
- M20: 5,109,216 km (0.047 R)
- M21: 5,272,876 km (0.115 R)
- M22: 5,647,320 km (0.052 R)
- M23: 5,901,636 km (0.077 R)
- M24: 5,944,271 km (0.095 R)
- M25: 7,228,120 km (0.101 R)
- M26: 7,319,824 km (0.083 R)
- M27: 9,380,086 km (0.092 R)
- M28: 10,810,690 km (0.051 R)
- M29: 11,178,850 km (0.07 R)
- M30: 11,551,050 km (0.103 R)
- M31: 12,144,206 km (0.047 R)
- M32: 12,253,113 km (0.073 R)
- M33: 12,526,877 km (0.063 R)
- M34: 12,968,939 km (0.073 R)
- M35: 14,039,162 km (0.12 R)
- M36: 16,383,061 km (0.096 R)
- M37: 16,684,351 km (0.113 R)
- M38: 16,987,586 km (0.102 R)
- M39: 17,048,473 km (0.111 R)
- M40: 18,218,627 km (0.105 R)
- M41: 18,280,860 km (0.091 R)
- M42: 18,719,032 km (0.118 R)
- M43: 19,733,306 km (0.107 R)
- M44: 21,880,783 km (0.107 R)
- M45: 22,279,162 km (0.101 R)
- M46: 22,479,174 km (0.039 R)
- M47: 24,101,115 km (0.047 R)
- M48: 24,443,694 km (0.104 R)
- M49: 24,512,509 km (0.12 R)
- M50: 24,857,033 km (0.1 R)
- M51: 24,926,147 km (0.094 R)
- M52: 25,133,789 km (0.1 R)
- M53: 26,392,056 km (0.069 R)
- M54: 26,603,737 km (0.045 R)
- M55: 26,674,348 km (0.066 R)
- M56: 26,745,107 km (0.104 R)
- M57: 27,028,745 km (0.094 R)
- M58: 28,389,487 km (0.099 R)
- M59: 29,114,588 km (0.095 R)
- M60: 30,066,330 km (0.082 R)
- M61: 30,731,143 km (0.117 R)
- M62: 32,075,279 km (0.115 R)
- M63: 33,514,710 km (0.087 R)
- M64: 34,050,420 km (0.096 R)
- M65: 35,207,709 km (0.087 R)
- M66: 37,007,072 km (0.096 R)
- M67: 37,086,060 km (0.11 R)
- M68: 37,719,308 km (0.085 R)
- M69: 38,356,146 km (0.054 R)
- M70: 39,157,243 km (0.092 R)
- M71: 39,237,577 km (0.111 R)
- M72: 39,398,694 km (0.086 R)
- M73: 39,559,811 km (0.102 R)
- M74: 42,995,475 km (0.116 R)
- M75: 43,743,913 km (0.048 R)
- M76: 44,245,365 km (0.075 R)
- M77: 44,329,140 km (0.064 R)
- M78: 44,664,688 km (0.098 R)
- M79: 44,748,762 km (0.119 R)
- M80: 46,780,900 km (0.055 R)
- M81: 47,464,861 km (0.064 R)
- M82: 47,894,058 km (0.094 R)
- M83: 50,233,918 km (0.113 R)
- M84: 51,109,963 km (0.095 R)
- M85: 51,638,043 km (0.106 R)
- M86: 52,610,729 km (0.052 R)
- M87: 53,054,885 km (0.111 R)
- M88: 55,023,892 km (0.086 R)
- M89: 55,926,865 km (0.083 R)
- M90: 58,205,390 km (0.103 R)
- M91: 59,032,965 km (0.109 R)
- M92: 59,402,173 km (0.106 R)
- M93: 60,979,383 km (0.105 R)
- M94: 61,259,131 km (0.114 R)
- M95: 61,726,325 km (0.105 R)
Planet 6 - Ice Giant
Semi-Major Axis: 8.89 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 877.3
Radius: 4.5
Gravity: 43.32 G
Time & Orbit
Eccentricity (e): 0.213
Orbit Range: 7 AU - 10.78 AU
Year: 17115 Days
Day: 21.8 Hours
Environment
Temp: -229 °C
Axial Tilt: 0.7 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (94)
Outer Limit: 71,039,664 km
- M1: 68,217 km (0.112 R)
- M2: 166,203 km (0.059 R)
- M3: 250,876 km (0.062 R)
- M4: 651,349 km (0.099 R)
- M5: 790,176 km (0.107 R)
- M6: 1,149,809 km (0.051 R)
- M7: 1,434,344 km (0.111 R)
- M8: 1,493,735 km (0.096 R)
- M9: 1,803,552 km (0.091 R)
- M10: 1,835,566 km (0.1 R)
- M11: 1,932,954 km (0.054 R)
- M12: 2,166,626 km (0.064 R)
- M13: 3,384,502 km (0.073 R)
- M14: 3,706,586 km (0.06 R)
- M15: 3,788,566 km (0.116 R)
- M16: 3,871,144 km (0.066 R)
- M17: 4,379,478 km (0.089 R)
- M18: 5,411,105 km (0.059 R)
- M19: 5,644,926 km (0.11 R)
- M20: 6,317,219 km (0.076 R)
- M21: 8,158,170 km (0.084 R)
- M22: 9,358,843 km (0.083 R)
- M23: 10,381,344 km (0.114 R)
- M24: 10,671,714 km (0.062 R)
- M25: 11,141,750 km (0.114 R)
- M26: 11,558,530 km (0.058 R)
- M27: 11,919,809 km (0.087 R)
- M28: 12,777,304 km (0.086 R)
- M29: 13,150,700 km (0.07 R)
- M30: 13,401,725 km (0.107 R)
- M31: 13,591,116 km (0.079 R)
- M32: 14,357,057 km (0.047 R)
- M33: 15,997,398 km (0.111 R)
- M34: 16,467,285 km (0.1 R)
- M35: 17,489,337 km (0.11 R)
- M36: 18,742,519 km (0.119 R)
- M37: 20,967,787 km (0.116 R)
- M38: 21,555,408 km (0.111 R)
- M39: 22,447,011 km (0.052 R)
- M40: 23,654,415 km (0.115 R)
- M41: 23,806,856 km (0.116 R)
- M42: 24,189,377 km (0.052 R)
- M43: 24,266,121 km (0.076 R)
- M44: 24,342,865 km (0.098 R)
- M45: 25,582,881 km (0.12 R)
- M46: 26,447,258 km (0.052 R)
- M47: 27,082,002 km (0.035 R)
- M48: 29,670,194 km (0.108 R)
- M49: 30,412,200 km (0.078 R)
- M50: 31,411,215 km (0.065 R)
- M51: 34,213,033 km (0.055 R)
- M52: 34,558,006 km (0.062 R)
- M53: 34,730,941 km (0.106 R)
- M54: 35,077,709 km (0.085 R)
- M55: 35,599,955 km (0.076 R)
- M56: 35,862,050 km (0.09 R)
- M57: 36,300,372 km (0.108 R)
- M58: 36,388,186 km (0.084 R)
- M59: 36,916,865 km (0.102 R)
- M60: 37,892,692 km (0.078 R)
- M61: 38,607,770 km (0.112 R)
- M62: 39,507,750 km (0.112 R)
- M63: 39,960,284 km (0.117 R)
- M64: 47,623,435 km (0.063 R)
- M65: 47,815,967 km (0.041 R)
- M66: 47,912,308 km (0.056 R)
- M67: 48,588,341 km (0.103 R)
- M68: 50,635,438 km (0.116 R)
- M69: 51,028,582 km (0.1 R)
- M70: 51,718,826 km (0.066 R)
- M71: 52,511,695 km (0.1 R)
- M72: 53,009,108 km (0.073 R)
- M73: 53,308,453 km (0.119 R)
- M74: 53,408,385 km (0.084 R)
- M75: 53,508,316 km (0.095 R)
- M76: 55,317,852 km (0.118 R)
- M77: 56,841,057 km (0.101 R)
- M78: 57,249,609 km (0.117 R)
- M79: 58,584,022 km (0.095 R)
- M80: 58,687,095 km (0.082 R)
- M81: 59,928,608 km (0.106 R)
- M82: 62,017,144 km (0.093 R)
- M83: 62,542,980 km (0.111 R)
- M84: 63,175,929 km (0.117 R)
- M85: 66,479,798 km (0.08 R)
- M86: 67,233,621 km (0.089 R)
- M87: 68,532,430 km (0.09 R)
- M88: 69,621,054 km (0.09 R)
- M89: 70,605,707 km (0.107 R)
- M90: 71,594,998 km (0.084 R)
- M91: 71,925,759 km (0.084 R)
- M92: 72,588,926 km (0.099 R)
- M93: 72,921,183 km (0.117 R)
- M94: 74,255,446 km (0.049 R)
Planet 7 - Ice Giant
Semi-Major Axis: 8.94 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 748.6
Radius: 4.5
Gravity: 36.97 G
Time & Orbit
Eccentricity (e): 0.209
Orbit Range: 7.07 AU - 10.81 AU
Year: 17259 Days
Day: 18.4 Hours
Environment
Temp: -223 °C
Axial Tilt: 38.7 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (96)
Outer Limit: 71,039,664 km
- M1: 67,618 km (0.117 R)
- M2: 137,929 km (0.054 R)
- M3: 688,898 km (0.114 R)
- M4: 1,484,908 km (0.027 R)
- M5: 1,602,343 km (0.083 R)
- M6: 1,662,182 km (0.108 R)
- M7: 2,167,374 km (0.097 R)
- M8: 2,402,392 km (0.066 R)
- M9: 3,498,945 km (0.102 R)
- M10: 4,345,818 km (0.079 R)
- M11: 4,598,938 km (0.105 R)
- M12: 5,386,720 km (0.116 R)
- M13: 5,796,020 km (0.099 R)
- M14: 6,121,395 km (0.063 R)
- M15: 7,083,160 km (0.098 R)
- M16: 8,401,865 km (0.071 R)
- M17: 8,454,075 km (0.072 R)
- M18: 8,928,899 km (0.099 R)
- M19: 9,849,225 km (0.106 R)
- M20: 10,236,833 km (0.11 R)
- M21: 10,460,631 km (0.113 R)
- M22: 10,856,018 km (0.105 R)
- M23: 11,313,937 km (0.105 R)
- M24: 12,189,384 km (0.101 R)
- M25: 12,248,625 km (0.102 R)
- M26: 13,696,283 km (0.066 R)
- M27: 14,190,854 km (0.09 R)
- M28: 14,565,447 km (0.104 R)
- M29: 14,628,278 km (0.076 R)
- M30: 14,817,071 km (0.071 R)
- M31: 15,070,190 km (0.052 R)
- M32: 15,644,646 km (0.1 R)
- M33: 15,902,403 km (0.103 R)
- M34: 16,487,181 km (0.089 R)
- M35: 16,683,753 km (0.111 R)
- M36: 16,881,073 km (0.108 R)
- M37: 17,013,018 km (0.085 R)
- M38: 17,811,870 km (0.106 R)
- M39: 18,759,423 km (0.091 R)
- M40: 19,101,703 km (0.118 R)
- M41: 19,377,113 km (0.071 R)
- M42: 21,269,825 km (0.096 R)
- M43: 21,841,888 km (0.043 R)
- M44: 22,346,481 km (0.119 R)
- M45: 23,001,121 km (0.09 R)
- M46: 23,074,125 km (0.063 R)
- M47: 23,957,501 km (0.11 R)
- M48: 24,851,946 km (0.097 R)
- M49: 25,681,317 km (0.082 R)
- M50: 26,366,774 km (0.116 R)
- M51: 26,981,023 km (0.106 R)
- M52: 27,289,793 km (0.084 R)
- M53: 27,444,777 km (0.059 R)
- M54: 27,911,073 km (0.088 R)
- M55: 28,851,745 km (0.115 R)
- M56: 30,122,130 km (0.057 R)
- M57: 30,442,568 km (0.103 R)
- M58: 31,816,774 km (0.049 R)
- M59: 32,716,905 km (0.114 R)
- M60: 35,213,693 km (0.078 R)
- M61: 37,857,237 km (0.09 R)
- M62: 38,897,690 km (0.062 R)
- M63: 39,596,462 km (0.104 R)
- M64: 40,475,798 km (0.112 R)
- M65: 41,272,557 km (0.101 R)
- M66: 41,806,771 km (0.082 R)
- M67: 41,895,931 km (0.06 R)
- M68: 42,432,688 km (0.081 R)
- M69: 43,061,897 km (0.097 R)
- M70: 43,513,084 km (0.052 R)
- M71: 45,425,543 km (0.063 R)
- M72: 46,715,525 km (0.113 R)
- M73: 47,179,279 km (0.083 R)
- M74: 47,924,276 km (0.111 R)
- M75: 49,049,103 km (0.116 R)
- M76: 50,372,296 km (0.117 R)
- M77: 52,282,960 km (0.095 R)
- M78: 52,667,875 km (0.116 R)
- M79: 53,247,118 km (0.114 R)
- M80: 54,314,499 km (0.073 R)
- M81: 54,509,275 km (0.113 R)
- M82: 56,371,769 km (0.089 R)
- M83: 56,964,176 km (0.072 R)
- M84: 57,459,495 km (0.078 R)
- M85: 58,354,539 km (0.1 R)
- M86: 59,053,909 km (0.109 R)
- M87: 60,158,540 km (0.078 R)
- M88: 63,103,224 km (0.045 R)
- M89: 63,410,648 km (0.082 R)
- M90: 63,923,918 km (0.09 R)
- M91: 64,129,466 km (0.078 R)
- M92: 65,057,870 km (0.102 R)
- M93: 67,345,820 km (0.106 R)
- M94: 67,555,107 km (0.059 R)
- M95: 68,920,786 km (0.065 R)
- M96: 69,342,951 km (0.081 R)
Kuiper Belt
Range: 30 - 51 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 412 - 18,029 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.