🌌 Stone's Star System Generator

Asteroid Belt

Center: 0.28 AU

Composition

Type: Inner (Rocky/Metallic)

A dense region of planetesimals and debris.

Boundary

Planet 1 - Gas Giant

Semi-Major Axis: 0.56 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 422.6

Radius: 12.6

Gravity: 2.66 G

Time & Orbit

Eccentricity (e): 0.242

Orbit Range: 0.42 AU - 0.7 AU

Year: 289 Days

Day: 5.8 Hours

Environment

Temp: -154 °C

Axial Tilt: 39.1 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (31)

Outer Limit: 39,157,200 km

• M1: 179,817 km (0.06 R)
• M2: 295,007 km (0.081 R)
• M3: 386,112 km (0.065 R)
• M4: 467,045 km (0.112 R)
• M5: 568,921 km (0.052 R)
• M6: 674,238 km (0.065 R)
• M7: 759,808 km (0.041 R)
• M8: 878,289 km (0.074 R)
• M9: 973,433 km (0.052 R)
• M10: 1,110,914 km (0.086 R)
• M11: 1,222,215 km (0.109 R)
• M12: 1,303,745 km (0.098 R)
• M13: 1,402,480 km (0.049 R)
• M14: 1,504,057 km (0.059 R)
• M15: 1,652,907 km (0.077 R)
• M16: 1,731,446 km (0.051 R)
• M17: 1,849,478 km (0.112 R)
• M18: 1,939,985 km (0.117 R)
• M19: 2,045,152 km (0.04 R)
• M20: 2,143,438 km (0.108 R)
• M21: 2,256,983 km (0.062 R)
• M22: 2,395,959 km (0.054 R)
• M23: 2,480,931 km (0.093 R)
• M24: 2,643,993 km (0.085 R)
• M25: 2,761,277 km (0.092 R)
• M26: 2,885,444 km (0.115 R)
• M27: 3,001,382 km (0.104 R)
• M28: 3,211,866 km (0.091 R)
• M29: 3,353,236 km (0.106 R)
• M30: 3,620,568 km (0.104 R)
• M31: 3,834,044 km (0.108 R)

Planet 2 - Gas Giant

Semi-Major Axis: 0.58 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 79.3

Radius: 9.8

Gravity: 0.83 G

Time & Orbit

Eccentricity (e): 0.037

Orbit Range: 0.56 AU - 0.6 AU

Year: 305 Days

Day: 8 Hours

Environment

Temp: -145 °C

Axial Tilt: 37.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (18)

Outer Limit: 39,157,200 km

• M1: 122,072 km (0.09 R)
• M2: 197,469 km (0.09 R)
• M3: 273,166 km (0.058 R)
• M4: 532,868 km (0.111 R)
• M5: 694,733 km (0.113 R)
• M6: 760,406 km (0.079 R)
• M7: 924,066 km (0.084 R)
• M8: 985,401 km (0.108 R)
• M9: 1,048,083 km (0.096 R)
• M10: 1,122,433 km (0.053 R)
• M11: 1,388,567 km (0.104 R)
• M12: 1,456,934 km (0.069 R)
• M13: 1,622,838 km (0.107 R)
• M14: 1,712,596 km (0.117 R)
• M15: 1,801,158 km (0.076 R)
• M16: 1,906,475 km (0.1 R)
• M17: 1,976,786 km (0.096 R)
• M18: 2,218,686 km (0.057 R)

Planet 3 - Gas Giant

Semi-Major Axis: 0.67 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 65.7

Radius: 14.2

Gravity: 0.33 G

Time & Orbit

Eccentricity (e): 0.215

Orbit Range: 0.53 AU - 0.81 AU

Year: 379 Days

Day: 13 Hours

Environment

Temp: -153 °C

Axial Tilt: 18.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (22)

Outer Limit: 39,157,200 km

• M1: 177,423 km (0.119 R)
• M2: 275,709 km (0.085 R)
• M3: 365,318 km (0.087 R)
• M4: 498,909 km (0.092 R)
• M5: 623,973 km (0.082 R)
• M6: 738,265 km (0.106 R)
• M7: 835,654 km (0.117 R)
• M8: 950,096 km (0.034 R)
• M9: 1,047,933 km (0.036 R)
• M10: 1,159,982 km (0.052 R)
• M11: 1,249,591 km (0.084 R)
• M12: 1,349,971 km (0.041 R)
• M13: 1,456,186 km (0.098 R)
• M14: 1,588,729 km (0.112 R)
• M15: 1,704,518 km (0.046 R)
• M16: 1,857,407 km (0.101 R)
• M17: 1,951,355 km (0.106 R)
• M18: 2,040,665 km (0.11 R)
• M19: 2,131,321 km (0.071 R)
• M20: 2,226,764 km (0.083 R)
• M21: 2,323,704 km (0.105 R)
• M22: 2,449,516 km (0.117 R)

Planet 4 - Gas Giant

Semi-Major Axis: 1.04 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 658.7

Radius: 10.3

Gravity: 6.21 G

Time & Orbit

Eccentricity (e): 0.035

Orbit Range: 1 AU - 1.08 AU

Year: 732 Days

Day: 5.5 Hours

Environment

Temp: -179 °C

Axial Tilt: 11.3 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (54)

Outer Limit: 39,157,200 km

• M1: 136,284 km (0.096 R)
• M2: 233,223 km (0.046 R)
• M3: 319,541 km (0.085 R)
• M4: 425,456 km (0.084 R)
• M5: 550,520 km (0.106 R)
• M6: 635,193 km (0.096 R)
• M7: 730,038 km (0.089 R)
• M8: 952,041 km (0.066 R)
• M9: 1,104,481 km (0.113 R)
• M10: 1,183,918 km (0.108 R)
• M11: 1,342,342 km (0.084 R)
• M12: 1,541,905 km (0.05 R)
• M13: 1,638,396 km (0.077 R)
• M14: 1,794,277 km (0.115 R)
• M15: 1,940,434 km (0.06 R)
• M16: 2,007,454 km (0.102 R)
• M17: 2,136,407 km (0.096 R)
• M18: 2,205,821 km (0.088 R)
• M19: 2,283,761 km (0.073 R)
• M20: 2,474,798 km (0.114 R)
• M21: 2,746,168 km (0.095 R)
• M22: 3,079,472 km (0.091 R)
• M23: 3,228,920 km (0.098 R)
• M24: 3,317,931 km (0.105 R)
• M25: 3,407,690 km (0.07 R)
• M26: 3,489,370 km (0.119 R)
• M27: 3,747,277 km (0.114 R)
• M28: 3,964,044 km (0.083 R)
• M29: 4,117,233 km (0.111 R)
• M30: 4,301,687 km (0.094 R)
• M31: 4,419,570 km (0.074 R)
• M32: 4,719,214 km (0.084 R)
• M33: 4,891,850 km (0.073 R)
• M34: 5,025,441 km (0.091 R)
• M35: 5,097,847 km (0.115 R)
• M36: 5,180,873 km (0.06 R)
• M37: 5,348,722 km (0.119 R)
• M38: 5,486,352 km (0.062 R)
• M39: 5,678,735 km (0.114 R)
• M40: 5,830,128 km (0.084 R)
• M41: 6,236,286 km (0.095 R)
• M42: 6,314,227 km (0.042 R)
• M43: 6,493,595 km (0.109 R)
• M44: 6,583,802 km (0.1 R)
• M45: 6,663,239 km (0.11 R)
• M46: 6,857,267 km (0.105 R)
• M47: 7,111,135 km (0.11 R)
• M48: 7,180,997 km (0.07 R)
• M49: 7,274,346 km (0.1 R)
• M50: 7,379,962 km (0.109 R)
• M51: 7,486,027 km (0.105 R)
• M52: 7,640,113 km (0.072 R)
• M53: 7,915,523 km (0.102 R)
• M54: 8,181,956 km (0.116 R)

Planet 5 - Gas Giant

Semi-Major Axis: 1.33 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 871.6

Radius: 14.6

Gravity: 4.09 G

Time & Orbit

Eccentricity (e): 0.138

Orbit Range: 1.15 AU - 1.51 AU

Year: 1059 Days

Day: 12.6 Hours

Environment

Temp: -182 °C

Axial Tilt: 32.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (57)

Outer Limit: 39,157,200 km

• M1: 253,269 km (0.111 R)
• M2: 366,814 km (0.09 R)
• M3: 485,445 km (0.11 R)
• M4: 826,528 km (0.091 R)
• M5: 1,033,721 km (0.083 R)
• M6: 1,136,794 km (0.1 R)
• M7: 1,394,701 km (0.108 R)
• M8: 1,569,282 km (0.107 R)
• M9: 1,724,863 km (0.107 R)
• M10: 1,922,632 km (0.055 R)
• M11: 2,090,032 km (0.111 R)
• M12: 2,223,922 km (0.094 R)
• M13: 2,390,275 km (0.115 R)
• M14: 2,746,467 km (0.107 R)
• M15: 2,840,864 km (0.081 R)
• M16: 3,087,251 km (0.115 R)
• M17: 3,185,687 km (0.088 R)
• M18: 3,453,168 km (0.111 R)
• M19: 3,763,284 km (0.116 R)
• M20: 3,892,237 km (0.093 R)
• M21: 3,998,751 km (0.119 R)
• M22: 4,154,632 km (0.119 R)
• M23: 4,361,376 km (0.069 R)
• M24: 4,534,311 km (0.091 R)
• M25: 4,646,809 km (0.047 R)
• M26: 4,785,486 km (0.103 R)
• M27: 4,976,822 km (0.064 R)
• M28: 5,222,910 km (0.081 R)
• M29: 5,473,188 km (0.065 R)
• M30: 5,619,794 km (0.063 R)
• M31: 5,781,359 km (0.089 R)
• M32: 5,971,797 km (0.029 R)
• M33: 6,136,654 km (0.107 R)
• M34: 6,247,506 km (0.037 R)
• M35: 6,527,404 km (0.094 R)
• M36: 6,768,556 km (0.109 R)
• M37: 6,926,232 km (0.087 R)
• M38: 7,392,080 km (0.096 R)
• M39: 7,569,353 km (0.117 R)
• M40: 7,837,881 km (0.093 R)
• M41: 8,170,587 km (0.061 R)
• M42: 8,308,067 km (0.106 R)
• M43: 8,415,479 km (0.113 R)
• M44: 8,585,272 km (0.064 R)
• M45: 8,724,997 km (0.111 R)
• M46: 8,865,469 km (0.116 R)
• M47: 9,085,527 km (0.1 R)
• M48: 9,307,531 km (0.07 R)
• M49: 9,611,663 km (0.084 R)
• M50: 9,837,855 km (0.064 R)
• M51: 10,000,468 km (0.103 R)
• M52: 10,098,455 km (0.05 R)
• M53: 10,279,019 km (0.032 R)
• M54: 10,427,570 km (0.117 R)
• M55: 10,626,685 km (0.108 R)
• M56: 11,282,821 km (0.103 R)
• M57: 11,504,375 km (0.034 R)

Planet 6 - Gas Giant

Semi-Major Axis: 1.5 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 476.2

Radius: 12.2

Gravity: 3.2 G

Time & Orbit

Eccentricity (e): 0.153

Orbit Range: 1.27 AU - 1.73 AU

Year: 1268 Days

Day: 6.2 Hours

Environment

Temp: -186 °C

Axial Tilt: 144.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (52)

Outer Limit: 39,157,200 km

• M1: 156,629 km (0.104 R)
• M2: 269,875 km (0.093 R)
• M3: 409,001 km (0.063 R)
• M4: 516,412 km (0.115 R)
• M5: 624,272 km (0.056 R)
• M6: 717,172 km (0.069 R)
• M7: 840,590 km (0.106 R)
• M8: 999,314 km (0.076 R)
• M9: 1,082,640 km (0.072 R)
• M10: 1,324,839 km (0.106 R)
• M11: 1,472,492 km (0.05 R)
• M12: 1,617,602 km (0.109 R)
• M13: 1,725,611 km (0.113 R)
• M14: 1,861,895 km (0.106 R)
• M15: 2,046,499 km (0.11 R)
• M16: 2,154,658 km (0.096 R)
• M17: 2,367,685 km (0.1 R)
• M18: 2,452,956 km (0.114 R)
• M19: 2,636,513 km (0.106 R)
• M20: 2,885,145 km (0.107 R)
• M21: 3,068,851 km (0.114 R)
• M22: 3,256,596 km (0.094 R)
• M23: 3,480,394 km (0.088 R)
• M24: 3,676,368 km (0.108 R)
• M25: 3,820,281 km (0.101 R)
• M26: 4,033,907 km (0.098 R)
• M27: 4,391,146 km (0.097 R)
• M28: 4,508,581 km (0.104 R)
• M29: 4,782,644 km (0.099 R)
• M30: 4,915,786 km (0.041 R)
• M31: 5,334,810 km (0.081 R)
• M32: 5,447,756 km (0.119 R)
• M33: 5,637,745 km (0.072 R)
• M34: 6,089,531 km (0.054 R)
• M35: 6,392,915 km (0.11 R)
• M36: 6,499,579 km (0.064 R)
• M37: 6,768,855 km (0.085 R)
• M38: 7,055,634 km (0.101 R)
• M39: 7,304,714 km (0.075 R)
• M40: 7,768,767 km (0.101 R)
• M41: 7,925,695 km (0.075 R)
• M42: 8,242,543 km (0.094 R)
• M43: 8,461,106 km (0.108 R)
• M44: 8,948,496 km (0.083 R)
• M45: 9,278,509 km (0.1 R)
• M46: 9,475,380 km (0.056 R)
• M47: 9,735,081 km (0.088 R)
• M48: 10,074,519 km (0.112 R)
• M49: 10,167,868 km (0.12 R)
• M50: 10,245,809 km (0.089 R)
• M51: 10,323,899 km (0.088 R)
• M52: 10,622,646 km (0.097 R)

Planet 7 - Gas Giant

Semi-Major Axis: 1.57 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 733

Radius: 13.8

Gravity: 3.85 G

Time & Orbit

Eccentricity (e): 0.037

Orbit Range: 1.51 AU - 1.63 AU

Year: 1358 Days

Day: 12.7 Hours

Environment

Temp: -196 °C

Axial Tilt: 0.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (57)

Outer Limit: 39,157,200 km

• M1: 177,573 km (0.115 R)
• M2: 285,582 km (0.036 R)
• M3: 378,483 km (0.04 R)
• M4: 826,827 km (0.104 R)
• M5: 1,115,252 km (0.111 R)
• M6: 1,238,521 km (0.025 R)
• M7: 1,340,547 km (0.091 R)
• M8: 1,428,061 km (0.099 R)
• M9: 1,553,873 km (0.113 R)
• M10: 1,655,600 km (0.073 R)
• M11: 1,759,570 km (0.088 R)
• M12: 1,846,487 km (0.054 R)
• M13: 2,014,784 km (0.103 R)
• M14: 2,136,706 km (0.092 R)
• M15: 2,356,316 km (0.094 R)
• M16: 2,683,038 km (0.075 R)
• M17: 2,886,341 km (0.115 R)
• M18: 3,141,854 km (0.093 R)
• M19: 3,236,700 km (0.094 R)
• M20: 3,356,527 km (0.041 R)
• M21: 3,613,237 km (0.065 R)
• M22: 3,750,269 km (0.113 R)
• M23: 3,927,243 km (0.111 R)
• M24: 4,158,970 km (0.032 R)
• M25: 4,342,377 km (0.112 R)
• M26: 4,731,033 km (0.089 R)
• M27: 5,005,545 km (0.048 R)
• M28: 5,831,624 km (0.118 R)
• M29: 5,919,588 km (0.078 R)
• M30: 6,380,798 km (0.103 R)
• M31: 6,715,299 km (0.116 R)
• M32: 6,823,009 km (0.1 R)
• M33: 6,962,285 km (0.08 R)
• M34: 7,055,634 km (0.093 R)
• M35: 7,149,432 km (0.081 R)
• M36: 7,656,718 km (0.111 R)
• M37: 7,769,365 km (0.111 R)
• M38: 8,044,925 km (0.084 R)
• M39: 8,175,823 km (0.098 R)
• M40: 8,356,986 km (0.045 R)
• M41: 8,456,319 km (0.114 R)
• M42: 8,942,063 km (0.059 R)
• M43: 9,043,790 km (0.1 R)
• M44: 9,333,860 km (0.074 R)
• M45: 9,419,729 km (0.104 R)
• M46: 9,575,161 km (0.106 R)
• M47: 9,748,695 km (0.109 R)
• M48: 9,853,413 km (0.099 R)
• M49: 9,958,431 km (0.038 R)
• M50: 10,063,898 km (0.099 R)
• M51: 10,328,985 km (0.053 R)
• M52: 10,993,050 km (0.062 R)
• M53: 11,339,519 km (0.078 R)
• M54: 11,597,126 km (0.073 R)
• M55: 11,708,128 km (0.109 R)
• M56: 11,837,979 km (0.102 R)
• M57: 12,362,618 km (0.085 R)

Planet 8 - Gas Giant

Semi-Major Axis: 2.09 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 19.1

Radius: 8.7

Gravity: 0.25 G

Time & Orbit

Eccentricity (e): 0.224

Orbit Range: 1.62 AU - 2.56 AU

Year: 2086 Days

Day: 6.5 Hours

Environment

Temp: -203 °C

Axial Tilt: 37.1 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (32)

Outer Limit: 39,157,200 km

• M1: 113,246 km (0.105 R)
• M2: 271,221 km (0.041 R)
• M3: 395,986 km (0.099 R)
• M4: 539,001 km (0.072 R)
• M5: 624,571 km (0.058 R)
• M6: 741,108 km (0.089 R)
• M7: 914,043 km (0.095 R)
• M8: 1,225,207 km (0.099 R)
• M9: 1,350,270 km (0.059 R)
• M10: 1,558,660 km (0.079 R)
• M11: 1,689,708 km (0.101 R)
• M12: 1,761,814 km (0.077 R)
• M13: 1,834,967 km (0.055 R)
• M14: 1,914,554 km (0.111 R)
• M15: 2,033,334 km (0.118 R)
• M16: 2,088,237 km (0.107 R)
• M17: 2,171,413 km (0.08 R)
• M18: 2,341,207 km (0.064 R)
• M19: 2,544,959 km (0.108 R)
• M20: 2,944,834 km (0.054 R)
• M21: 3,007,216 km (0.061 R)
• M22: 3,190,623 km (0.111 R)
• M23: 3,325,710 km (0.089 R)
• M24: 3,456,010 km (0.057 R)
• M25: 3,925,897 km (0.097 R)
• M26: 4,224,644 km (0.088 R)
• M27: 4,281,042 km (0.118 R)
• M28: 4,380,226 km (0.071 R)
• M29: 4,566,774 km (0.085 R)
• M30: 4,719,214 km (0.116 R)
• M31: 4,785,187 km (0.116 R)
• M32: 4,843,979 km (0.054 R)

Planet 9 - Gas Giant

Semi-Major Axis: 4.84 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 691.3

Radius: 14

Gravity: 3.53 G

Time & Orbit

Eccentricity (e): 0.073

Orbit Range: 4.49 AU - 5.19 AU

Year: 7350 Days

Day: 12.2 Hours

Environment

Temp: -228 °C

Axial Tilt: 29 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (78)

Outer Limit: 39,157,200 km

• M1: 192,233 km (0.073 R)
• M2: 328,218 km (0.056 R)
• M3: 533,915 km (0.102 R)
• M4: 761,453 km (0.115 R)
• M5: 974,780 km (0.085 R)
• M6: 1,106,276 km (0.093 R)
• M7: 1,481,617 km (0.109 R)
• M8: 1,596,359 km (0.059 R)
• M9: 2,668,976 km (0.12 R)
• M10: 2,834,580 km (0.11 R)
• M11: 2,930,622 km (0.076 R)
• M12: 3,028,011 km (0.118 R)
• M13: 4,033,308 km (0.092 R)
• M14: 4,530,272 km (0.114 R)
• M15: 4,700,365 km (0.063 R)
• M16: 5,492,037 km (0.096 R)
• M17: 5,643,280 km (0.117 R)
• M18: 6,011,890 km (0.102 R)
• M19: 6,262,017 km (0.117 R)
• M20: 6,611,777 km (0.043 R)
• M21: 6,772,744 km (0.11 R)
• M22: 6,870,133 km (0.119 R)
• M23: 7,497,097 km (0.114 R)
• M24: 8,108,055 km (0.087 R)
• M25: 8,664,709 km (0.114 R)
• M26: 8,805,779 km (0.082 R)
• M27: 9,522,952 km (0.108 R)
• M28: 9,851,768 km (0.112 R)
• M29: 10,258,824 km (0.113 R)
• M30: 10,483,220 km (0.11 R)
• M31: 10,633,716 km (0.102 R)
• M32: 10,974,949 km (0.118 R)
• M33: 11,358,368 km (0.087 R)
• M34: 11,629,439 km (0.103 R)
• M35: 12,654,933 km (0.116 R)
• M36: 12,936,027 km (0.075 R)
• M37: 13,057,201 km (0.104 R)
• M38: 13,668,309 km (0.119 R)
• M39: 13,874,155 km (0.114 R)
• M40: 14,960,834 km (0.09 R)
• M41: 15,087,992 km (0.115 R)
• M42: 15,729,319 km (0.095 R)
• M43: 16,335,788 km (0.083 R)
• M44: 16,423,153 km (0.065 R)
• M45: 17,840,743 km (0.082 R)
• M46: 18,473,243 km (0.068 R)
• M47: 19,297,377 km (0.092 R)
• M48: 19,435,905 km (0.038 R)
• M49: 20,555,944 km (0.114 R)
• M50: 20,886,556 km (0.111 R)
• M51: 22,566,091 km (0.062 R)
• M52: 22,760,867 km (0.068 R)
• M53: 23,005,011 km (0.103 R)
• M54: 23,348,338 km (0.085 R)
• M55: 23,594,576 km (0.118 R)
• M56: 23,742,828 km (0.03 R)
• M57: 24,089,745 km (0.111 R)
• M58: 24,688,436 km (0.073 R)
• M59: 25,241,649 km (0.092 R)
• M60: 25,748,038 km (0.081 R)
• M61: 26,002,503 km (0.12 R)
• M62: 26,308,880 km (0.078 R)
• M63: 26,565,291 km (0.115 R)
• M64: 27,028,745 km (0.091 R)
• M65: 27,494,742 km (0.042 R)
• M66: 27,911,372 km (0.105 R)
• M67: 29,385,809 km (0.07 R)
• M68: 30,025,489 km (0.072 R)
• M69: 30,723,663 km (0.058 R)
• M70: 30,939,532 km (0.116 R)
• M71: 31,101,846 km (0.106 R)
• M72: 31,318,613 km (0.07 R)
• M73: 32,410,079 km (0.093 R)
• M74: 35,588,585 km (0.096 R)
• M75: 36,099,462 km (0.096 R)
• M76: 36,384,446 km (0.085 R)
• M77: 36,727,175 km (0.069 R)
• M78: 37,071,100 km (0.1 R)

Kuiper Belt

Range: 30 - 59 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 381 - 11,066 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit