G5V Star System Generated (Seed: 1766594386)
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 (7 Planets)
Planet 1 - Terrestrial
Semi-Major Axis: 0.66 AU
Status: Inner (Hot)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 3.21
Radius: 1.59
Gravity: 1.27 G
Time & Orbit
Eccentricity (e): 0.11
Orbit Range: 0.59 AU - 0.73 AU
Year: 200 Days
Day: 48 Hours
Environment
Temp: 159 °C
Axial Tilt: 21.2 °
Atmosphere: Dense COâ‚‚
Biome: Volcanic/Barren
Planet 2 - Terrestrial
Semi-Major Axis: 1.41 AU
Status: Outer (Cold)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 4.7
Radius: 1.86
Gravity: 1.36 G
Time & Orbit
Eccentricity (e): 0.043
Orbit Range: 1.35 AU - 1.47 AU
Year: 624 Days
Day: 24 Hours
Environment
Temp: -31 °C
Axial Tilt: 8.4 °
Atmosphere: Thin Nâ‚‚/CHâ‚„
Biome: Ice Cap/Desert
Satellites (1)
Outer Limit: 84,466,005 km
- M1: 1,381,387 km (0.078 R)
Planet 3 - Gas Giant
Semi-Major Axis: 4.53 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 682.5
Radius: 14.1
Gravity: 3.43 G
Time & Orbit
Eccentricity (e): 0.246
Orbit Range: 3.42 AU - 5.64 AU
Year: 3594 Days
Day: 12.8 Hours
Environment
Temp: -132 °C
Axial Tilt: 16.9 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (74)
Outer Limit: 84,466,005 km
- M1: 186,549 km (0.117 R)
- M2: 493,673 km (0.09 R)
- M3: 718,967 km (0.088 R)
- M4: 856,747 km (0.084 R)
- M5: 992,881 km (0.064 R)
- M6: 1,237,174 km (0.073 R)
- M7: 1,460,973 km (0.046 R)
- M8: 1,669,961 km (0.098 R)
- M9: 1,859,352 km (0.1 R)
- M10: 2,389,078 km (0.108 R)
- M11: 2,620,805 km (0.099 R)
- M12: 2,895,018 km (0.107 R)
- M13: 3,178,656 km (0.093 R)
- M14: 3,360,567 km (0.103 R)
- M15: 3,850,051 km (0.107 R)
- M16: 4,044,528 km (0.102 R)
- M17: 4,262,193 km (0.096 R)
- M18: 4,382,619 km (0.026 R)
- M19: 4,565,278 km (0.091 R)
- M20: 4,688,547 km (0.115 R)
- M21: 6,162,535 km (0.112 R)
- M22: 6,505,862 km (0.116 R)
- M23: 6,668,325 km (0.088 R)
- M24: 6,950,018 km (0.084 R)
- M25: 7,092,285 km (0.089 R)
- M26: 7,259,536 km (0.111 R)
- M27: 7,355,578 km (0.082 R)
- M28: 7,695,614 km (0.105 R)
- M29: 8,165,201 km (0.055 R)
- M30: 8,874,445 km (0.093 R)
- M31: 9,367,071 km (0.046 R)
- M32: 9,656,393 km (0.085 R)
- M33: 9,788,787 km (0.05 R)
- M34: 9,948,558 km (0.059 R)
- M35: 10,297,719 km (0.071 R)
- M36: 10,433,105 km (0.108 R)
- M37: 10,897,906 km (0.085 R)
- M38: 11,202,337 km (0.105 R)
- M39: 11,341,613 km (0.097 R)
- M40: 11,453,512 km (0.081 R)
- M41: 11,593,835 km (0.047 R)
- M42: 11,932,973 km (0.098 R)
- M43: 12,046,668 km (0.082 R)
- M44: 12,160,811 km (0.082 R)
- M45: 12,361,422 km (0.048 R)
- M46: 13,499,413 km (0.071 R)
- M47: 13,588,274 km (0.108 R)
- M48: 13,707,204 km (0.118 R)
- M49: 14,276,574 km (0.114 R)
- M50: 14,579,360 km (0.099 R)
- M51: 15,718,248 km (0.074 R)
- M52: 16,125,304 km (0.106 R)
- M53: 16,314,246 km (0.055 R)
- M54: 16,662,660 km (0.095 R)
- M55: 17,077,644 km (0.082 R)
- M56: 17,302,490 km (0.103 R)
- M57: 17,657,785 km (0.106 R)
- M58: 17,983,010 km (0.062 R)
- M59: 18,178,984 km (0.037 R)
- M60: 18,408,616 km (0.058 R)
- M61: 18,573,324 km (0.045 R)
- M62: 18,738,330 km (0.11 R)
- M63: 18,870,874 km (0.11 R)
- M64: 19,470,612 km (0.074 R)
- M65: 19,840,268 km (0.065 R)
- M66: 20,076,782 km (0.117 R)
- M67: 20,689,086 km (0.039 R)
- M68: 20,825,968 km (0.08 R)
- M69: 22,036,814 km (0.089 R)
- M70: 22,351,867 km (0.074 R)
- M71: 22,774,331 km (0.031 R)
- M72: 23,519,777 km (0.118 R)
- M73: 23,770,204 km (0.106 R)
- M74: 23,877,615 km (0.076 R)
Planet 4 - Gas Giant
Semi-Major Axis: 11.51 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 873.3
Radius: 11.9
Gravity: 6.17 G
Time & Orbit
Eccentricity (e): 0.189
Orbit Range: 9.33 AU - 13.69 AU
Year: 14557 Days
Day: 10.4 Hours
Environment
Temp: -192 °C
Axial Tilt: 39.9 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (91)
Outer Limit: 84,466,005 km
- M1: 150,047 km (0.108 R)
- M2: 661,073 km (0.103 R)
- M3: 783,893 km (0.087 R)
- M4: 1,007,242 km (0.065 R)
- M5: 1,303,147 km (0.113 R)
- M6: 1,712,148 km (0.03 R)
- M7: 2,037,074 km (0.105 R)
- M8: 3,342,465 km (0.109 R)
- M9: 3,902,111 km (0.057 R)
- M10: 4,173,481 km (0.109 R)
- M11: 4,411,043 km (0.111 R)
- M12: 4,491,227 km (0.086 R)
- M13: 4,858,191 km (0.108 R)
- M14: 4,941,068 km (0.042 R)
- M15: 5,024,394 km (0.091 R)
- M16: 5,234,878 km (0.103 R)
- M17: 6,285,355 km (0.099 R)
- M18: 6,558,071 km (0.119 R)
- M19: 6,788,452 km (0.028 R)
- M20: 7,304,565 km (0.039 R)
- M21: 7,495,302 km (0.073 R)
- M22: 7,639,514 km (0.08 R)
- M23: 7,784,774 km (0.095 R)
- M24: 8,524,236 km (0.12 R)
- M25: 8,624,616 km (0.108 R)
- M26: 8,927,851 km (0.065 R)
- M27: 9,389,510 km (0.047 R)
- M28: 10,176,096 km (0.098 R)
- M29: 10,336,016 km (0.046 R)
- M30: 10,929,321 km (0.111 R)
- M31: 11,202,786 km (0.09 R)
- M32: 11,868,197 km (0.103 R)
- M33: 12,318,936 km (0.118 R)
- M34: 13,005,590 km (0.063 R)
- M35: 13,295,361 km (0.085 R)
- M36: 14,595,666 km (0.08 R)
- M37: 15,200,191 km (0.094 R)
- M38: 15,998,295 km (0.085 R)
- M39: 16,558,689 km (0.056 R)
- M40: 18,213,840 km (0.07 R)
- M41: 19,126,836 km (0.103 R)
- M42: 22,161,129 km (0.107 R)
- M43: 22,715,988 km (0.088 R)
- M44: 24,194,464 km (0.096 R)
- M45: 24,408,239 km (0.065 R)
- M46: 25,486,391 km (0.103 R)
- M47: 25,703,757 km (0.099 R)
- M48: 25,849,166 km (0.114 R)
- M49: 28,361,512 km (0.084 R)
- M50: 28,812,999 km (0.107 R)
- M51: 29,266,729 km (0.11 R)
- M52: 30,181,370 km (0.106 R)
- M53: 30,565,388 km (0.088 R)
- M54: 34,652,701 km (0.114 R)
- M55: 34,893,703 km (0.073 R)
- M56: 35,054,671 km (0.111 R)
- M57: 36,514,746 km (0.054 R)
- M58: 37,169,985 km (0.072 R)
- M59: 37,498,950 km (0.095 R)
- M60: 37,746,385 km (0.111 R)
- M61: 37,911,691 km (0.114 R)
- M62: 38,160,023 km (0.082 R)
- M63: 38,575,157 km (0.032 R)
- M64: 41,352,442 km (0.061 R)
- M65: 41,864,216 km (0.101 R)
- M66: 47,810,133 km (0.108 R)
- M67: 48,616,765 km (0.053 R)
- M68: 48,796,581 km (0.055 R)
- M69: 48,886,639 km (0.117 R)
- M70: 48,976,697 km (0.041 R)
- M71: 49,427,735 km (0.087 R)
- M72: 49,518,242 km (0.068 R)
- M73: 49,608,599 km (0.109 R)
- M74: 49,699,105 km (0.057 R)
- M75: 50,698,270 km (0.088 R)
- M76: 51,337,651 km (0.113 R)
- M77: 52,071,578 km (0.057 R)
- M78: 52,347,586 km (0.086 R)
- M79: 54,667,400 km (0.036 R)
- M80: 56,075,266 km (0.051 R)
- M81: 57,971,120 km (0.108 R)
- M82: 58,161,857 km (0.118 R)
- M83: 60,370,221 km (0.043 R)
- M84: 61,922,598 km (0.089 R)
- M85: 62,410,436 km (0.105 R)
- M86: 63,980,017 km (0.115 R)
- M87: 65,860,762 km (0.073 R)
- M88: 66,059,727 km (0.112 R)
- M89: 66,458,405 km (0.052 R)
- M90: 66,558,187 km (0.083 R)
- M91: 66,657,969 km (0.106 R)
Planet 5 - Gas Giant
Semi-Major Axis: 11.9 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 95.5
Radius: 10.7
Gravity: 0.83 G
Time & Orbit
Eccentricity (e): 0.048
Orbit Range: 11.33 AU - 12.47 AU
Year: 15303 Days
Day: 5.5 Hours
Environment
Temp: -189 °C
Axial Tilt: 49.5 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (83)
Outer Limit: 84,466,005 km
- M1: 199,564 km (0.082 R)
- M2: 321,187 km (0.112 R)
- M3: 406,009 km (0.06 R)
- M4: 500,554 km (0.069 R)
- M5: 690,394 km (0.052 R)
- M6: 876,943 km (0.053 R)
- M7: 1,005,896 km (0.082 R)
- M8: 1,110,914 km (0.073 R)
- M9: 1,332,319 km (0.108 R)
- M10: 1,482,515 km (0.115 R)
- M11: 1,673,851 km (0.096 R)
- M12: 1,836,613 km (0.047 R)
- M13: 1,929,364 km (0.12 R)
- M14: 3,433,122 km (0.109 R)
- M15: 3,548,312 km (0.032 R)
- M16: 3,641,511 km (0.094 R)
- M17: 3,854,090 km (0.116 R)
- M18: 3,925,897 km (0.03 R)
- M19: 4,977,420 km (0.107 R)
- M20: 5,346,628 km (0.111 R)
- M21: 5,480,668 km (0.085 R)
- M22: 5,972,396 km (0.119 R)
- M23: 6,055,722 km (0.117 R)
- M24: 6,139,497 km (0.033 R)
- M25: 6,336,367 km (0.078 R)
- M26: 6,506,909 km (0.088 R)
- M27: 6,707,669 km (0.083 R)
- M28: 7,204,035 km (0.08 R)
- M29: 7,381,907 km (0.091 R)
- M30: 7,803,025 km (0.116 R)
- M31: 8,016,501 km (0.071 R)
- M32: 8,700,014 km (0.119 R)
- M33: 9,629,316 km (0.109 R)
- M34: 10,590,183 km (0.08 R)
- M35: 11,965,137 km (0.034 R)
- M36: 12,246,830 km (0.094 R)
- M37: 12,459,558 km (0.115 R)
- M38: 13,286,385 km (0.057 R)
- M39: 13,359,090 km (0.078 R)
- M40: 14,316,666 km (0.081 R)
- M41: 15,449,122 km (0.09 R)
- M42: 15,987,375 km (0.075 R)
- M43: 16,336,686 km (0.098 R)
- M44: 16,453,671 km (0.081 R)
- M45: 16,610,001 km (0.043 R)
- M46: 16,688,390 km (0.111 R)
- M47: 17,121,775 km (0.112 R)
- M48: 17,280,349 km (0.064 R)
- M49: 17,678,878 km (0.116 R)
- M50: 17,758,913 km (0.114 R)
- M51: 17,839,097 km (0.097 R)
- M52: 18,322,598 km (0.085 R)
- M53: 18,444,221 km (0.12 R)
- M54: 19,015,236 km (0.053 R)
- M55: 19,302,763 km (0.118 R)
- M56: 19,799,278 km (0.035 R)
- M57: 20,049,107 km (0.107 R)
- M58: 20,299,982 km (0.091 R)
- M59: 21,186,200 km (0.069 R)
- M60: 22,344,088 km (0.059 R)
- M61: 22,647,771 km (0.114 R)
- M62: 22,908,969 km (0.119 R)
- M63: 23,698,846 km (0.115 R)
- M64: 23,875,671 km (0.109 R)
- M65: 24,052,794 km (0.074 R)
- M66: 24,631,589 km (0.079 R)
- M67: 25,125,112 km (0.074 R)
- M68: 26,030,478 km (0.044 R)
- M69: 26,350,019 km (0.053 R)
- M70: 26,487,201 km (0.117 R)
- M71: 26,946,616 km (0.07 R)
- M72: 27,084,994 km (0.109 R)
- M73: 27,454,949 km (0.1 R)
- M74: 27,547,849 km (0.069 R)
- M75: 28,059,923 km (0.119 R)
- M76: 28,434,366 km (0.097 R)
- M77: 28,528,164 km (0.075 R)
- M78: 28,810,456 km (0.114 R)
- M79: 31,246,507 km (0.111 R)
- M80: 31,634,714 km (0.115 R)
- M81: 32,268,710 km (0.112 R)
- M82: 32,464,683 km (0.053 R)
- M83: 32,907,044 km (0.11 R)
Planet 6 - Ice Giant
Semi-Major Axis: 12.62 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 429.4
Radius: 4
Gravity: 26.84 G
Time & Orbit
Eccentricity (e): 0.097
Orbit Range: 11.4 AU - 13.84 AU
Year: 16713 Days
Day: 16.4 Hours
Environment
Temp: -182 °C
Axial Tilt: 4.3 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (73)
Outer Limit: 84,466,005 km
- M1: 125,662 km (0.102 R)
- M2: 166,502 km (0.115 R)
- M3: 225,444 km (0.105 R)
- M4: 734,226 km (0.086 R)
- M5: 794,215 km (0.095 R)
- M6: 1,259,165 km (0.047 R)
- M7: 1,505,553 km (0.108 R)
- M8: 1,793,529 km (0.086 R)
- M9: 2,389,527 km (0.116 R)
- M10: 2,479,286 km (0.116 R)
- M11: 2,724,177 km (0.071 R)
- M12: 3,436,712 km (0.066 R)
- M13: 3,504,181 km (0.063 R)
- M14: 3,848,405 km (0.087 R)
- M15: 5,368,320 km (0.043 R)
- M16: 5,486,053 km (0.118 R)
- M17: 7,092,585 km (0.119 R)
- M18: 7,135,519 km (0.067 R)
- M19: 7,221,837 km (0.046 R)
- M20: 7,968,630 km (0.037 R)
- M21: 8,283,384 km (0.114 R)
- M22: 8,419,368 km (0.113 R)
- M23: 8,602,027 km (0.049 R)
- M24: 8,832,109 km (0.082 R)
- M25: 9,204,458 km (0.041 R)
- M26: 9,298,405 km (0.115 R)
- M27: 9,629,465 km (0.065 R)
- M28: 10,157,695 km (0.108 R)
- M29: 10,254,635 km (0.094 R)
- M30: 10,843,302 km (0.061 R)
- M31: 11,041,968 km (0.096 R)
- M32: 11,091,934 km (0.055 R)
- M33: 11,848,600 km (0.096 R)
- M34: 12,310,558 km (0.113 R)
- M35: 14,054,271 km (0.104 R)
- M36: 15,203,482 km (0.101 R)
- M37: 16,382,612 km (0.103 R)
- M38: 17,416,334 km (0.041 R)
- M39: 18,589,480 km (0.046 R)
- M40: 19,727,471 km (0.105 R)
- M41: 19,848,645 km (0.111 R)
- M42: 20,764,633 km (0.106 R)
- M43: 24,045,165 km (0.096 R)
- M44: 24,109,791 km (0.116 R)
- M45: 24,433,970 km (0.088 R)
- M46: 24,824,719 km (0.078 R)
- M47: 25,086,516 km (0.063 R)
- M48: 25,152,040 km (0.063 R)
- M49: 27,280,219 km (0.116 R)
- M50: 30,159,529 km (0.051 R)
- M51: 30,368,966 km (0.05 R)
- M52: 30,648,714 km (0.066 R)
- M53: 32,345,902 km (0.079 R)
- M54: 33,710,833 km (0.114 R)
- M55: 33,928,199 km (0.12 R)
- M56: 34,000,604 km (0.115 R)
- M57: 34,509,686 km (0.1 R)
- M58: 34,728,697 km (0.028 R)
- M59: 35,978,138 km (0.047 R)
- M60: 39,127,323 km (0.054 R)
- M61: 39,584,345 km (0.111 R)
- M62: 40,273,243 km (0.064 R)
- M63: 42,754,473 km (0.092 R)
- M64: 43,461,173 km (0.09 R)
- M65: 44,092,626 km (0.107 R)
- M66: 44,965,679 km (0.038 R)
- M67: 47,294,918 km (0.045 R)
- M68: 48,270,147 km (0.12 R)
- M69: 48,842,059 km (0.095 R)
- M70: 49,087,849 km (0.117 R)
- M71: 50,240,500 km (0.079 R)
- M72: 52,236,884 km (0.059 R)
- M73: 55,194,434 km (0.066 R)
Planet 7 - Ice Giant
Semi-Major Axis: 16.86 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 562.8
Radius: 6.2
Gravity: 14.64 G
Time & Orbit
Eccentricity (e): 0.093
Orbit Range: 15.29 AU - 18.43 AU
Year: 25807 Days
Day: 19.1 Hours
Environment
Temp: -203 °C
Axial Tilt: 20 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (92)
Outer Limit: 84,466,005 km
- M1: 98,435 km (0.093 R)
- M2: 149,149 km (0.093 R)
- M3: 472,430 km (0.086 R)
- M4: 582,983 km (0.071 R)
- M5: 992,432 km (0.026 R)
- M6: 1,225,506 km (0.102 R)
- M7: 1,317,359 km (0.102 R)
- M8: 1,379,891 km (0.108 R)
- M9: 1,775,876 km (0.112 R)
- M10: 1,845,140 km (0.092 R)
- M11: 1,986,660 km (0.089 R)
- M12: 2,094,969 km (0.072 R)
- M13: 2,470,459 km (0.108 R)
- M14: 2,948,275 km (0.096 R)
- M15: 2,989,414 km (0.118 R)
- M16: 3,368,196 km (0.095 R)
- M17: 4,640,526 km (0.104 R)
- M18: 5,028,732 km (0.11 R)
- M19: 5,326,881 km (0.107 R)
- M20: 5,528,689 km (0.097 R)
- M21: 5,940,083 km (0.061 R)
- M22: 6,096,861 km (0.118 R)
- M23: 6,308,093 km (0.109 R)
- M24: 7,343,759 km (0.051 R)
- M25: 8,140,219 km (0.112 R)
- M26: 8,904,065 km (0.112 R)
- M27: 9,083,732 km (0.095 R)
- M28: 9,446,358 km (0.119 R)
- M29: 9,568,280 km (0.082 R)
- M30: 11,654,422 km (0.115 R)
- M31: 11,916,518 km (0.098 R)
- M32: 13,187,950 km (0.062 R)
- M33: 13,667,261 km (0.111 R)
- M34: 13,805,191 km (0.057 R)
- M35: 14,012,982 km (0.062 R)
- M36: 15,210,064 km (0.098 R)
- M37: 15,424,737 km (0.081 R)
- M38: 15,929,480 km (0.06 R)
- M39: 18,381,090 km (0.091 R)
- M40: 19,611,383 km (0.106 R)
- M41: 20,236,403 km (0.119 R)
- M42: 20,315,092 km (0.12 R)
- M43: 21,345,971 km (0.113 R)
- M44: 22,393,904 km (0.092 R)
- M45: 23,047,048 km (0.098 R)
- M46: 23,211,306 km (0.096 R)
- M47: 23,541,020 km (0.084 R)
- M48: 23,623,598 km (0.054 R)
- M49: 24,121,609 km (0.12 R)
- M50: 24,288,411 km (0.08 R)
- M51: 24,455,662 km (0.11 R)
- M52: 25,977,221 km (0.104 R)
- M53: 26,922,082 km (0.082 R)
- M54: 28,668,786 km (0.041 R)
- M55: 29,199,859 km (0.099 R)
- M56: 30,271,877 km (0.1 R)
- M57: 30,722,316 km (0.099 R)
- M58: 30,993,537 km (0.031 R)
- M59: 33,750,327 km (0.109 R)
- M60: 34,123,723 km (0.055 R)
- M61: 34,311,020 km (0.106 R)
- M62: 34,968,951 km (0.117 R)
- M63: 39,297,565 km (0.107 R)
- M64: 39,788,845 km (0.097 R)
- M65: 40,579,021 km (0.062 R)
- M66: 41,574,146 km (0.059 R)
- M67: 44,198,840 km (0.026 R)
- M68: 46,772,672 km (0.093 R)
- M69: 47,397,542 km (0.074 R)
- M70: 49,394,674 km (0.03 R)
- M71: 49,818,485 km (0.11 R)
- M72: 53,470,318 km (0.052 R)
- M73: 54,014,705 km (0.094 R)
- M74: 54,123,762 km (0.104 R)
- M75: 55,108,714 km (0.076 R)
- M76: 55,658,486 km (0.117 R)
- M77: 58,658,522 km (0.06 R)
- M78: 60,008,643 km (0.099 R)
- M79: 60,800,913 km (0.097 R)
- M80: 62,739,402 km (0.119 R)
- M81: 64,235,381 km (0.113 R)
- M82: 64,351,020 km (0.053 R)
- M83: 71,410,244 km (0.101 R)
- M84: 71,769,578 km (0.086 R)
- M85: 73,213,048 km (0.032 R)
- M86: 75,518,052 km (0.097 R)
- M87: 75,640,124 km (0.039 R)
- M88: 76,495,674 km (0.095 R)
- M89: 80,074,654 km (0.083 R)
- M90: 80,946,660 km (0.078 R)
- M91: 81,696,594 km (0.113 R)
- M92: 82,448,772 km (0.112 R)
Kuiper Belt
Range: 30 - 56 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 164 - 10,499 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.