🌌 Stone's Star System Generator

Planet 1 - Terrestrial

Semi-Major Axis: 0.56 AU

Status: HZ

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 4.34

Radius: 1.8

Gravity: 1.34 G

Time & Orbit

Eccentricity (e): 0.048

Orbit Range: 0.53 AU - 0.59 AU

Year: 183 Days

Day: 41.4 Hours

Environment

Temp: 32 °C

Axial Tilt: 10 °

Atmosphere: N₂, O₂

Biome: Oceanic/Continental

Satellites (1)

Outer Limit: 72,921,388 km

• M1: 508,483 km (0.117 R)

Planet 2 - Terrestrial

Semi-Major Axis: 0.59 AU

Status: HZ

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 4.65

Radius: 1.85

Gravity: 1.36 G

Time & Orbit

Eccentricity (e): 0.244

Orbit Range: 0.45 AU - 0.73 AU

Year: 198 Days

Day: 45.8 Hours

Environment

Temp: 10 °C

Axial Tilt: 2.1 °

Atmosphere: N₂, O₂

Biome: Oceanic/Continental

Planet 3 - Terrestrial

Semi-Major Axis: 1.48 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 4.37

Radius: 1.8

Gravity: 1.35 G

Time & Orbit

Eccentricity (e): 0.135

Orbit Range: 1.28 AU - 1.68 AU

Year: 786 Days

Day: 26.4 Hours

Environment

Temp: -87 °C

Axial Tilt: 48.8 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Planet 4 - Terrestrial

Semi-Major Axis: 2.03 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 1.49

Radius: 1.17

Gravity: 1.09 G

Time & Orbit

Eccentricity (e): 0.055

Orbit Range: 1.92 AU - 2.14 AU

Year: 1263 Days

Day: 17.6 Hours

Environment

Temp: -111 °C

Axial Tilt: 31.1 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Satellites (1)

Outer Limit: 72,921,388 km

• M1: 879,037 km (0.053 R)

Planet 5 - Gas Giant

Semi-Major Axis: 3.01 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 970.5

Radius: 11.5

Gravity: 7.34 G

Time & Orbit

Eccentricity (e): 0.04

Orbit Range: 2.89 AU - 3.13 AU

Year: 2280 Days

Day: 14.4 Hours

Environment

Temp: -150 °C

Axial Tilt: 12.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (76)

Outer Limit: 72,921,388 km

• M1: 146,307 km (0.112 R)
• M2: 226,641 km (0.099 R)
• M3: 314,754 km (0.093 R)
• M4: 458,517 km (0.065 R)
• M5: 552,764 km (0.108 R)
• M6: 841,189 km (0.059 R)
• M7: 1,176,737 km (0.104 R)
• M8: 1,383,930 km (0.084 R)
• M9: 1,467,854 km (0.113 R)
• M10: 2,090,181 km (0.097 R)
• M11: 2,286,155 km (0.051 R)
• M12: 2,386,535 km (0.1 R)
• M13: 2,741,979 km (0.112 R)
• M14: 3,226,078 km (0.112 R)
• M15: 3,339,174 km (0.118 R)
• M16: 3,552,800 km (0.094 R)
• M17: 3,652,881 km (0.083 R)
• M18: 4,185,300 km (0.056 R)
• M19: 4,380,076 km (0.092 R)
• M20: 4,982,656 km (0.102 R)
• M21: 5,689,357 km (0.076 R)
• M22: 5,826,687 km (0.118 R)
• M23: 6,839,016 km (0.105 R)
• M24: 7,493,806 km (0.117 R)
• M25: 7,622,909 km (0.107 R)
• M26: 7,861,518 km (0.1 R)
• M27: 8,614,593 km (0.025 R)
• M28: 8,727,390 km (0.101 R)
• M29: 9,045,585 km (0.095 R)
• M30: 9,460,270 km (0.073 R)
• M31: 9,576,657 km (0.095 R)
• M32: 9,740,168 km (0.102 R)
• M33: 10,236,833 km (0.092 R)
• M34: 10,356,212 km (0.034 R)
• M35: 10,452,104 km (0.04 R)
• M36: 10,572,381 km (0.088 R)
• M37: 10,693,256 km (0.046 R)
• M38: 10,911,669 km (0.111 R)
• M39: 11,082,659 km (0.115 R)
• M40: 11,353,282 km (0.073 R)
• M41: 11,501,683 km (0.114 R)
• M42: 11,576,182 km (0.107 R)
• M43: 11,675,815 km (0.095 R)
• M44: 11,775,596 km (0.109 R)
• M45: 11,850,695 km (0.104 R)
• M46: 12,026,472 km (0.076 R)
• M47: 12,203,147 km (0.06 R)
• M48: 12,406,151 km (0.088 R)
• M49: 12,584,622 km (0.093 R)
• M50: 12,661,365 km (0.098 R)
• M51: 12,918,524 km (0.11 R)
• M52: 13,281,299 km (0.116 R)
• M53: 13,463,958 km (0.113 R)
• M54: 13,752,682 km (0.109 R)
• M55: 13,963,914 km (0.104 R)
• M56: 14,149,715 km (0.112 R)
• M57: 14,256,228 km (0.091 R)
• M58: 14,336,263 km (0.098 R)
• M59: 14,550,487 km (0.1 R)
• M60: 14,631,121 km (0.095 R)
• M61: 15,117,912 km (0.098 R)
• M62: 15,199,592 km (0.097 R)
• M63: 15,281,422 km (0.078 R)
• M64: 15,445,382 km (0.047 R)
• M65: 15,858,122 km (0.119 R)
• M66: 15,941,149 km (0.117 R)
• M67: 16,302,278 km (0.044 R)
• M68: 16,386,053 km (0.12 R)
• M69: 16,497,952 km (0.097 R)
• M70: 16,807,022 km (0.109 R)
• M71: 17,716,876 km (0.086 R)
• M72: 18,235,681 km (0.096 R)
• M73: 18,876,559 km (0.066 R)
• M74: 19,111,577 km (0.075 R)
• M75: 19,258,781 km (0.072 R)
• M76: 20,001,086 km (0.067 R)

Planet 6 - Gas Giant

Semi-Major Axis: 4.22 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 697.8

Radius: 12

Gravity: 4.85 G

Time & Orbit

Eccentricity (e): 0.004

Orbit Range: 4.2 AU - 4.24 AU

Year: 3785 Days

Day: 8.8 Hours

Environment

Temp: -157 °C

Axial Tilt: 136.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (76)

Outer Limit: 72,921,388 km

• M1: 160,967 km (0.073 R)
• M2: 299,645 km (0.115 R)
• M3: 380,727 km (0.083 R)
• M4: 545,883 km (0.091 R)
• M5: 849,267 km (0.116 R)
• M6: 930,648 km (0.063 R)
• M7: 1,076,955 km (0.086 R)
• M8: 1,284,597 km (0.108 R)
• M9: 1,519,914 km (0.113 R)
• M10: 1,606,532 km (0.083 R)
• M11: 1,815,221 km (0.079 R)
• M12: 1,969,905 km (0.083 R)
• M13: 2,048,892 km (0.11 R)
• M14: 2,511,748 km (0.09 R)
• M15: 2,862,256 km (0.07 R)
• M16: 3,006,917 km (0.059 R)
• M17: 3,209,922 km (0.109 R)
• M18: 3,494,008 km (0.077 R)
• M19: 3,985,886 km (0.12 R)
• M20: 4,353,747 km (0.059 R)
• M21: 4,732,678 km (0.112 R)
• M22: 4,818,398 km (0.034 R)
• M23: 4,904,566 km (0.119 R)
• M24: 5,013,025 km (0.1 R)
• M25: 5,321,047 km (0.1 R)
• M26: 5,771,935 km (0.047 R)
• M27: 6,165,078 km (0.108 R)
• M28: 6,400,246 km (0.03 R)
• M29: 6,879,856 km (0.101 R)
• M30: 7,148,534 km (0.106 R)
• M31: 7,271,803 km (0.044 R)
• M32: 7,495,601 km (0.108 R)
• M33: 7,848,054 km (0.076 R)
• M34: 8,206,191 km (0.093 R)
• M35: 8,621,924 km (0.112 R)
• M36: 9,285,390 km (0.027 R)
• M37: 9,800,755 km (0.078 R)
• M38: 10,214,094 km (0.069 R)
• M39: 10,381,045 km (0.111 R)
• M40: 10,492,944 km (0.067 R)
• M41: 10,859,160 km (0.115 R)
• M42: 11,115,122 km (0.088 R)
• M43: 11,459,646 km (0.091 R)
• M44: 11,604,157 km (0.109 R)
• M45: 11,807,610 km (0.088 R)
• M46: 11,982,939 km (0.11 R)
• M47: 12,100,224 km (0.101 R)
• M48: 12,217,957 km (0.097 R)
• M49: 12,514,011 km (0.085 R)
• M50: 12,603,321 km (0.111 R)
• M51: 12,692,781 km (0.096 R)
• M52: 13,355,500 km (0.07 R)
• M53: 13,906,169 km (0.082 R)
• M54: 15,442,689 km (0.075 R)
• M55: 15,538,432 km (0.036 R)
• M56: 15,762,828 km (0.094 R)
• M57: 16,279,689 km (0.035 R)
• M58: 16,377,227 km (0.103 R)
• M59: 17,065,377 km (0.047 R)
• M60: 17,796,462 km (0.1 R)
• M61: 19,083,303 km (0.118 R)
• M62: 19,289,149 km (0.105 R)
• M63: 19,668,679 km (0.113 R)
• M64: 20,434,920 km (0.062 R)
• M65: 20,540,236 km (0.107 R)
• M66: 20,716,014 km (0.037 R)
• M67: 21,069,215 km (0.041 R)
• M68: 21,317,697 km (0.082 R)
• M69: 21,531,322 km (0.055 R)
• M70: 21,674,188 km (0.047 R)
• M71: 21,853,257 km (0.111 R)
• M72: 21,960,818 km (0.114 R)
• M73: 23,339,661 km (0.089 R)
• M74: 23,560,019 km (0.107 R)
• M75: 24,896,227 km (0.037 R)
• M76: 25,008,575 km (0.062 R)

Planet 7 - Gas Giant

Semi-Major Axis: 6.41 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 189.2

Radius: 10.7

Gravity: 1.65 G

Time & Orbit

Eccentricity (e): 0.024

Orbit Range: 6.26 AU - 6.56 AU

Year: 7085 Days

Day: 7.2 Hours

Environment

Temp: -193 °C

Axial Tilt: 5.8 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (78)

Outer Limit: 72,921,388 km

• M1: 139,276 km (0.087 R)
• M2: 261,347 km (0.043 R)
• M3: 468,840 km (0.108 R)
• M4: 629,807 km (0.119 R)
• M5: 867,069 km (0.101 R)
• M6: 960,718 km (0.058 R)
• M7: 1,120,638 km (0.07 R)
• M8: 1,289,683 km (0.049 R)
• M9: 1,741,918 km (0.12 R)
• M10: 1,862,643 km (0.106 R)
• M11: 2,112,472 km (0.11 R)
• M12: 2,225,268 km (0.113 R)
• M13: 2,340,010 km (0.085 R)
• M14: 2,473,750 km (0.062 R)
• M15: 2,837,124 km (0.074 R)
• M16: 3,291,752 km (0.07 R)
• M17: 3,710,925 km (0.119 R)
• M18: 3,926,944 km (0.044 R)
• M19: 4,086,715 km (0.096 R)
• M20: 4,309,915 km (0.104 R)
• M21: 5,176,834 km (0.109 R)
• M22: 5,485,156 km (0.106 R)
• M23: 5,686,514 km (0.047 R)
• M24: 6,004,709 km (0.116 R)
• M25: 6,073,674 km (0.041 R)
• M26: 6,352,075 km (0.086 R)
• M27: 6,539,970 km (0.11 R)
• M28: 6,634,666 km (0.116 R)
• M29: 6,825,403 km (0.095 R)
• M30: 6,921,445 km (0.1 R)
• M31: 7,163,644 km (0.109 R)
• M32: 7,482,586 km (0.118 R)
• M33: 7,881,713 km (0.061 R)
• M34: 8,134,534 km (0.096 R)
• M35: 8,364,615 km (0.118 R)
• M36: 9,465,955 km (0.082 R)
• M37: 9,546,289 km (0.09 R)
• M38: 9,626,922 km (0.042 R)
• M39: 10,170,411 km (0.069 R)
• M40: 10,335,418 km (0.1 R)
• M41: 11,060,668 km (0.067 R)
• M42: 11,486,573 km (0.117 R)
• M43: 12,179,211 km (0.083 R)
• M44: 12,295,898 km (0.066 R)
• M45: 12,530,617 km (0.052 R)
• M46: 12,648,500 km (0.11 R)
• M47: 12,737,212 km (0.06 R)
• M48: 12,855,693 km (0.054 R)
• M49: 12,974,623 km (0.086 R)
• M50: 13,153,692 km (0.07 R)
• M51: 13,695,685 km (0.059 R)
• M52: 14,153,006 km (0.072 R)
• M53: 14,368,127 km (0.094 R)
• M54: 14,522,512 km (0.116 R)
• M55: 15,176,704 km (0.102 R)
• M56: 15,302,366 km (0.085 R)
• M57: 15,554,887 km (0.108 R)
• M58: 15,713,461 km (0.116 R)
• M59: 15,840,619 km (0.086 R)
• M60: 16,707,988 km (0.098 R)
• M61: 16,902,914 km (0.118 R)
• M62: 17,590,914 km (0.104 R)
• M63: 18,892,865 km (0.084 R)
• M64: 19,062,060 km (0.101 R)
• M65: 19,367,688 km (0.065 R)
• M66: 19,778,035 km (0.064 R)
• M67: 19,846,551 km (0.116 R)
• M68: 20,156,518 km (0.08 R)
• M69: 20,572,250 km (0.067 R)
• M70: 20,990,825 km (0.098 R)
• M71: 21,095,843 km (0.068 R)
• M72: 21,376,937 km (0.076 R)
• M73: 21,623,923 km (0.069 R)
• M74: 22,908,820 km (0.07 R)
• M75: 23,233,896 km (0.078 R)
• M76: 23,560,617 km (0.118 R)
• M77: 24,181,748 km (0.116 R)
• M78: 24,512,658 km (0.102 R)

Planet 8 - Gas Giant

Semi-Major Axis: 7.83 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 431.2

Radius: 13

Gravity: 2.55 G

Time & Orbit

Eccentricity (e): 0.214

Orbit Range: 6.15 AU - 9.51 AU

Year: 9565 Days

Day: 6.2 Hours

Environment

Temp: -184 °C

Axial Tilt: 34.4 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (73)

Outer Limit: 72,921,388 km

• M1: 162,912 km (0.069 R)
• M2: 265,686 km (0.105 R)
• M3: 432,936 km (0.117 R)
• M4: 515,813 km (0.118 R)
• M5: 632,649 km (0.111 R)
• M6: 1,111,363 km (0.107 R)
• M7: 1,343,090 km (0.042 R)
• M8: 1,532,331 km (0.117 R)
• M9: 1,710,652 km (0.106 R)
• M10: 2,066,395 km (0.095 R)
• M11: 2,632,474 km (0.081 R)
• M12: 2,921,048 km (0.08 R)
• M13: 3,270,957 km (0.052 R)
• M14: 3,634,480 km (0.076 R)
• M15: 3,767,622 km (0.092 R)
• M16: 4,093,596 km (0.1 R)
• M17: 4,400,721 km (0.113 R)
• M18: 4,890,055 km (0.053 R)
• M19: 5,518,665 km (0.03 R)
• M20: 5,641,336 km (0.099 R)
• M21: 6,525,609 km (0.099 R)
• M22: 6,950,766 km (0.068 R)
• M23: 8,633,742 km (0.044 R)
• M24: 8,956,125 km (0.087 R)
• M25: 9,209,694 km (0.054 R)
• M26: 9,539,108 km (0.105 R)
• M27: 10,134,358 km (0.094 R)
• M28: 10,360,700 km (0.092 R)
• M29: 11,478,345 km (0.047 R)
• M30: 12,877,834 km (0.079 R)
• M31: 13,205,303 km (0.063 R)
• M32: 13,784,995 km (0.085 R)
• M33: 14,542,559 km (0.09 R)
• M34: 14,670,016 km (0.057 R)
• M35: 14,798,072 km (0.071 R)
• M36: 15,141,100 km (0.09 R)
• M37: 15,791,252 km (0.096 R)
• M38: 16,539,391 km (0.097 R)
• M39: 17,933,045 km (0.102 R)
• M40: 18,482,667 km (0.093 R)
• M41: 19,130,875 km (0.113 R)
• M42: 19,786,562 km (0.08 R)
• M43: 19,880,809 km (0.097 R)
• M44: 20,783,931 km (0.062 R)
• M45: 20,927,845 km (0.086 R)
• M46: 21,894,995 km (0.066 R)
• M47: 22,041,451 km (0.089 R)
• M48: 22,236,975 km (0.084 R)
• M49: 23,672,666 km (0.102 R)
• M50: 25,291,465 km (0.064 R)
• M51: 25,547,576 km (0.095 R)
• M52: 27,364,891 km (0.095 R)
• M53: 27,522,567 km (0.112 R)
• M54: 28,368,693 km (0.096 R)
• M55: 28,848,453 km (0.115 R)
• M56: 30,140,829 km (0.086 R)
• M57: 30,575,860 km (0.096 R)
• M58: 31,177,393 km (0.109 R)
• M59: 32,281,126 km (0.113 R)
• M60: 32,670,380 km (0.112 R)
• M61: 33,960,512 km (0.115 R)
• M62: 34,583,437 km (0.106 R)
• M63: 34,810,976 km (0.026 R)
• M64: 35,496,284 km (0.114 R)
• M65: 35,725,767 km (0.065 R)
• M66: 35,840,658 km (0.046 R)
• M67: 36,532,698 km (0.1 R)
• M68: 36,764,275 km (0.076 R)
• M69: 36,996,451 km (0.105 R)
• M70: 37,229,076 km (0.069 R)
• M71: 37,403,956 km (0.101 R)
• M72: 39,226,207 km (0.032 R)
• M73: 39,820,111 km (0.092 R)

Planet 9 - Ice Giant

Semi-Major Axis: 11.16 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 910.5

Radius: 3.3

Gravity: 83.61 G

Time & Orbit

Eccentricity (e): 0.098

Orbit Range: 10.07 AU - 12.25 AU

Year: 16276 Days

Day: 19.1 Hours

Environment

Temp: -194 °C

Axial Tilt: 4.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (96)

Outer Limit: 72,921,388 km

• M1: 74,949 km (0.114 R)
• M2: 930,349 km (0.083 R)
• M3: 1,248,843 km (0.05 R)
• M4: 1,783,805 km (0.105 R)
• M5: 2,041,712 km (0.114 R)
• M6: 2,380,401 km (0.054 R)
• M7: 2,485,419 km (0.052 R)
• M8: 2,520,724 km (0.092 R)
• M9: 2,663,740 km (0.09 R)
• M10: 4,065,023 km (0.112 R)
• M11: 4,106,761 km (0.03 R)
• M12: 4,705,451 km (0.059 R)
• M13: 5,330,771 km (0.073 R)
• M14: 5,376,398 km (0.042 R)
• M15: 5,468,101 km (0.092 R)
• M16: 5,746,503 km (0.119 R)
• M17: 5,981,820 km (0.049 R)
• M18: 6,220,429 km (0.101 R)
• M19: 6,365,090 km (0.074 R)
• M20: 7,561,574 km (0.038 R)
• M21: 7,767,570 km (0.117 R)
• M22: 7,819,331 km (0.107 R)
• M23: 7,871,242 km (0.118 R)
• M24: 7,923,302 km (0.109 R)
• M25: 8,080,080 km (0.101 R)
• M26: 8,237,906 km (0.077 R)
• M27: 9,370,661 km (0.113 R)
• M28: 9,591,916 km (0.095 R)
• M29: 10,152,459 km (0.093 R)
• M30: 10,551,138 km (0.1 R)
• M31: 11,481,637 km (0.078 R)
• M32: 12,377,578 km (0.052 R)
• M33: 13,171,943 km (0.065 R)
• M34: 13,794,270 km (0.074 R)
• M35: 15,002,722 km (0.114 R)
• M36: 15,652,126 km (0.059 R)
• M37: 15,848,847 km (0.07 R)
• M38: 16,244,534 km (0.078 R)
• M39: 16,844,271 km (0.111 R)
• M40: 18,133,805 km (0.117 R)
• M41: 18,825,246 km (0.096 R)
• M42: 19,384,593 km (0.06 R)
• M43: 20,376,427 km (0.101 R)
• M44: 20,519,442 km (0.098 R)
• M45: 20,662,757 km (0.056 R)
• M46: 20,878,477 km (0.093 R)
• M47: 24,201,944 km (0.055 R)
• M48: 24,353,486 km (0.101 R)
• M49: 24,581,324 km (0.106 R)
• M50: 25,192,132 km (0.074 R)
• M51: 25,962,860 km (0.104 R)
• M52: 26,506,948 km (0.059 R)
• M53: 28,082,063 km (0.118 R)
• M54: 30,419,231 km (0.031 R)
• M55: 31,569,639 km (0.087 R)
• M56: 31,817,971 km (0.037 R)
• M57: 32,067,052 km (0.102 R)
• M58: 32,233,404 km (0.117 R)
• M59: 32,483,532 km (0.115 R)
• M60: 37,793,957 km (0.098 R)
• M61: 37,881,771 km (0.111 R)
• M62: 39,296,219 km (0.115 R)
• M63: 39,741,871 km (0.032 R)
• M64: 40,998,344 km (0.1 R)
• M65: 41,178,908 km (0.097 R)
• M66: 42,724,254 km (0.084 R)
• M67: 42,815,808 km (0.119 R)
• M68: 44,103,547 km (0.113 R)
• M69: 44,752,203 km (0.067 R)
• M70: 45,310,801 km (0.118 R)
• M71: 47,189,003 km (0.045 R)
• M72: 47,283,549 km (0.097 R)
• M73: 47,852,320 km (0.119 R)
• M74: 47,947,464 km (0.11 R)
• M75: 48,901,001 km (0.083 R)
• M76: 49,572,396 km (0.096 R)
• M77: 49,668,438 km (0.065 R)
• M78: 51,506,996 km (0.118 R)
• M79: 54,157,720 km (0.103 R)
• M80: 55,150,751 km (0.106 R)
• M81: 58,673,033 km (0.1 R)
• M82: 58,876,486 km (0.108 R)
• M83: 59,386,166 km (0.075 R)
• M84: 60,615,412 km (0.046 R)
• M85: 61,853,035 km (0.081 R)
• M86: 62,890,646 km (0.03 R)
• M87: 64,983,221 km (0.107 R)
• M88: 65,193,705 km (0.069 R)
• M89: 68,592,568 km (0.065 R)
• M90: 69,236,288 km (0.09 R)
• M91: 69,666,532 km (0.103 R)
• M92: 70,205,533 km (0.116 R)
• M93: 70,529,562 km (0.115 R)
• M94: 70,745,880 km (0.073 R)
• M95: 71,830,914 km (0.098 R)
• M96: 72,266,393 km (0.026 R)

Kuiper Belt

Range: 30 - 53 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 419 - 12,127 AU

Composition

Type: Cometary Reservoir

System's final boundary, containing trillions of icy planetesimals.

Gravitational Limit