🌌 Stone's Star System Generator

Planet 1 - Terrestrial

Semi-Major Axis: 0.64 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 3.7

Radius: 1.69

Gravity: 1.3 G

Time & Orbit

Eccentricity (e): 0.233

Orbit Range: 0.49 AU - 0.79 AU

Year: 336 Days

Day: 25.8 Hours

Environment

Temp: -136 °C

Axial Tilt: 44.7 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Satellites (1)

Outer Limit: 49,394,227 km

• M1: 837,000 km (0.111 R)

Planet 2 - Gas Giant

Semi-Major Axis: 0.78 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 613.3

Radius: 11.3

Gravity: 4.8 G

Time & Orbit

Eccentricity (e): 0.249

Orbit Range: 0.59 AU - 0.97 AU

Year: 452 Days

Day: 14.8 Hours

Environment

Temp: -152 °C

Axial Tilt: 19.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (39)

Outer Limit: 49,394,227 km

• M1: 140,772 km (0.115 R)
• M2: 248,781 km (0.091 R)
• M3: 335,099 km (0.112 R)
• M4: 433,834 km (0.072 R)
• M5: 517,010 km (0.055 R)
• M6: 588,368 km (0.068 R)
• M7: 747,092 km (0.091 R)
• M8: 847,023 km (0.051 R)
• M9: 952,041 km (0.078 R)
• M10: 1,080,545 km (0.044 R)
• M11: 1,171,202 km (0.048 R)
• M12: 1,320,052 km (0.112 R)
• M13: 1,412,503 km (0.077 R)
• M14: 1,604,138 km (0.05 R)
• M15: 1,844,542 km (0.075 R)
• M16: 1,936,993 km (0.047 R)
• M17: 2,151,068 km (0.094 R)
• M18: 2,298,122 km (0.087 R)
• M19: 2,423,186 km (0.097 R)
• M20: 2,531,495 km (0.091 R)
• M21: 2,654,465 km (0.083 R)
• M22: 2,759,482 km (0.119 R)
• M23: 2,960,392 km (0.075 R)
• M24: 3,090,243 km (0.114 R)
• M25: 3,277,989 km (0.05 R)
• M26: 3,348,449 km (0.119 R)
• M27: 3,455,112 km (0.087 R)
• M28: 3,534,100 km (0.106 R)
• M29: 3,664,699 km (0.117 R)
• M30: 3,789,613 km (0.062 R)
• M31: 3,915,874 km (0.032 R)
• M32: 4,066,369 km (0.065 R)
• M33: 4,334,150 km (0.073 R)
• M34: 4,458,615 km (0.091 R)
• M35: 4,703,058 km (0.059 R)
• M36: 4,951,989 km (0.093 R)
• M37: 5,106,673 km (0.102 R)
• M38: 5,296,064 km (0.041 R)
• M39: 5,818,460 km (0.103 R)

Planet 3 - Gas Giant

Semi-Major Axis: 1.56 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 974.5

Radius: 12.7

Gravity: 6.04 G

Time & Orbit

Eccentricity (e): 0.24

Orbit Range: 1.19 AU - 1.93 AU

Year: 1278 Days

Day: 9.6 Hours

Environment

Temp: -187 °C

Axial Tilt: 18 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (61)

Outer Limit: 49,394,227 km

• M1: 160,219 km (0.12 R)
• M2: 246,537 km (0.118 R)
• M3: 382,073 km (0.094 R)
• M4: 553,811 km (0.101 R)
• M5: 685,308 km (0.114 R)
• M6: 843,582 km (0.115 R)
• M7: 935,585 km (0.098 R)
• M8: 1,114,055 km (0.108 R)
• M9: 1,322,296 km (0.101 R)
• M10: 1,468,453 km (0.04 R)
• M11: 1,581,848 km (0.115 R)
• M12: 1,708,108 km (0.113 R)
• M13: 1,888,823 km (0.098 R)
• M14: 1,992,045 km (0.107 R)
• M15: 2,139,848 km (0.117 R)
• M16: 2,791,347 km (0.097 R)
• M17: 2,957,700 km (0.1 R)
• M18: 3,042,073 km (0.109 R)
• M19: 3,387,943 km (0.117 R)
• M20: 3,617,127 km (0.11 R)
• M21: 3,707,634 km (0.065 R)
• M22: 3,838,382 km (0.114 R)
• M23: 4,131,295 km (0.053 R)
• M24: 4,459,213 km (0.063 R)
• M25: 4,838,444 km (0.11 R)
• M26: 5,169,654 km (0.089 R)
• M27: 5,360,241 km (0.055 R)
• M28: 5,809,035 km (0.108 R)
• M29: 5,991,993 km (0.117 R)
• M30: 6,363,744 km (0.089 R)
• M31: 6,615,667 km (0.118 R)
• M32: 7,194,760 km (0.105 R)
• M33: 7,573,243 km (0.098 R)
• M34: 7,656,419 km (0.111 R)
• M35: 7,790,160 km (0.084 R)
• M36: 7,924,648 km (0.116 R)
• M37: 8,009,021 km (0.097 R)
• M38: 8,093,843 km (0.057 R)
• M39: 8,212,923 km (0.104 R)
• M40: 8,349,955 km (0.081 R)
• M41: 8,487,585 km (0.052 R)
• M42: 8,643,316 km (0.056 R)
• M43: 9,045,884 km (0.109 R)
• M44: 9,151,949 km (0.117 R)
• M45: 9,436,634 km (0.095 R)
• M46: 9,706,209 km (0.109 R)
• M47: 9,814,817 km (0.087 R)
• M48: 9,996,728 km (0.094 R)
• M49: 10,179,686 km (0.098 R)
• M50: 10,271,539 km (0.104 R)
• M51: 10,437,743 km (0.036 R)
• M52: 10,530,493 km (0.084 R)
• M53: 11,073,534 km (0.115 R)
• M54: 11,338,920 km (0.09 R)
• M55: 11,434,214 km (0.067 R)
• M56: 12,050,707 km (0.06 R)
• M57: 12,206,438 km (0.108 R)
• M58: 12,362,918 km (0.09 R)
• M59: 12,461,054 km (0.108 R)
• M60: 13,015,464 km (0.069 R)
• M61: 13,679,229 km (0.101 R)

Planet 4 - Gas Giant

Semi-Major Axis: 2.23 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 592.8

Radius: 12.5

Gravity: 3.79 G

Time & Orbit

Eccentricity (e): 0.169

Orbit Range: 1.85 AU - 2.61 AU

Year: 2185 Days

Day: 8.4 Hours

Environment

Temp: -188 °C

Axial Tilt: 47.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (64)

Outer Limit: 49,394,227 km

• M1: 205,398 km (0.073 R)
• M2: 350,059 km (0.051 R)
• M3: 479,162 km (0.084 R)
• M4: 569,369 km (0.069 R)
• M5: 721,959 km (0.112 R)
• M6: 820,694 km (0.053 R)
• M7: 933,640 km (0.098 R)
• M8: 1,166,714 km (0.084 R)
• M9: 1,275,621 km (0.03 R)
• M10: 1,601,445 km (0.09 R)
• M11: 1,690,007 km (0.029 R)
• M12: 1,977,684 km (0.08 R)
• M13: 2,073,127 km (0.045 R)
• M14: 2,331,333 km (0.052 R)
• M15: 2,483,773 km (0.026 R)
• M16: 2,639,505 km (0.036 R)
• M17: 2,879,460 km (0.03 R)
• M18: 3,029,656 km (0.065 R)
• M19: 3,154,421 km (0.104 R)
• M20: 3,452,569 km (0.105 R)
• M21: 3,539,486 km (0.102 R)
• M22: 3,641,811 km (0.096 R)
• M23: 3,789,613 km (0.073 R)
• M24: 3,879,372 km (0.093 R)
• M25: 4,000,247 km (0.103 R)
• M26: 4,106,910 km (0.104 R)
• M27: 4,292,113 km (0.093 R)
• M28: 4,511,722 km (0.084 R)
• M29: 4,607,016 km (0.104 R)
• M30: 4,864,324 km (0.1 R)
• M31: 5,226,052 km (0.04 R)
• M32: 5,545,593 km (0.12 R)
• M33: 5,630,714 km (0.103 R)
• M34: 6,115,711 km (0.089 R)
• M35: 6,327,691 km (0.076 R)
• M36: 6,416,851 km (0.035 R)
• M37: 6,777,232 km (0.077 R)
• M38: 6,941,640 km (0.112 R)
• M39: 7,200,146 km (0.057 R)
• M40: 7,311,746 km (0.112 R)
• M41: 7,555,889 km (0.078 R)
• M42: 7,994,361 km (0.089 R)
• M43: 8,226,387 km (0.11 R)
• M44: 9,298,106 km (0.071 R)
• M45: 9,809,132 km (0.109 R)
• M46: 10,036,970 km (0.103 R)
• M47: 10,162,034 km (0.106 R)
• M48: 10,413,508 km (0.068 R)
• M49: 10,688,319 km (0.042 R)
• M50: 10,858,711 km (0.111 R)
• M51: 11,288,506 km (0.091 R)
• M52: 11,375,123 km (0.055 R)
• M53: 11,877,622 km (0.088 R)
• M54: 12,342,872 km (0.103 R)
• M55: 12,813,955 km (0.119 R)
• M56: 13,154,141 km (0.116 R)
• M57: 13,820,300 km (0.095 R)
• M58: 14,709,809 km (0.108 R)
• M59: 14,804,504 km (0.043 R)
• M60: 14,923,136 km (0.06 R)
• M61: 15,473,207 km (0.116 R)
• M62: 15,641,953 km (0.069 R)
• M63: 16,176,167 km (0.083 R)
• M64: 16,494,661 km (0.111 R)

Planet 5 - Gas Giant

Semi-Major Axis: 2.31 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 874.8

Radius: 9.8

Gravity: 9.11 G

Time & Orbit

Eccentricity (e): 0.15

Orbit Range: 1.96 AU - 2.66 AU

Year: 2303 Days

Day: 9.5 Hours

Environment

Temp: -197 °C

Axial Tilt: 113.3 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (76)

Outer Limit: 49,394,227 km

• M1: 164,857 km (0.12 R)
• M2: 260,001 km (0.116 R)
• M3: 332,556 km (0.08 R)
• M4: 414,386 km (0.102 R)
• M5: 699,520 km (0.064 R)
• M6: 773,122 km (0.102 R)
• M7: 839,992 km (0.085 R)
• M8: 969,693 km (0.106 R)
• M9: 1,032,076 km (0.11 R)
• M10: 1,095,804 km (0.067 R)
• M11: 1,183,020 km (0.06 R)
• M12: 1,519,166 km (0.091 R)
• M13: 1,604,736 km (0.101 R)
• M14: 1,666,969 km (0.102 R)
• M15: 1,730,099 km (0.095 R)
• M16: 2,071,183 km (0.12 R)
• M17: 2,208,214 km (0.104 R)
• M18: 2,476,742 km (0.117 R)
• M19: 2,830,990 km (0.08 R)
• M20: 3,123,155 km (0.038 R)
• M21: 3,264,824 km (0.03 R)
• M22: 3,636,874 km (0.093 R)
• M23: 3,736,207 km (0.069 R)
• M24: 4,005,633 km (0.119 R)
• M25: 4,177,221 km (0.112 R)
• M26: 4,281,341 km (0.082 R)
• M27: 4,527,580 km (0.101 R)
• M28: 4,598,938 km (0.063 R)
• M29: 4,851,309 km (0.104 R)
• M30: 4,924,164 km (0.115 R)
• M31: 5,163,819 km (0.11 R)
• M32: 5,501,910 km (0.059 R)
• M33: 5,750,692 km (0.085 R)
• M34: 6,101,200 km (0.098 R)
• M35: 6,199,785 km (0.086 R)
• M36: 6,458,738 km (0.107 R)
• M37: 6,559,268 km (0.093 R)
• M38: 6,823,159 km (0.082 R)
• M39: 7,256,694 km (0.094 R)
• M40: 7,487,373 km (0.113 R)
• M41: 8,194,074 km (0.114 R)
• M42: 8,456,319 km (0.12 R)
• M43: 8,699,116 km (0.098 R)
• M44: 8,921,867 km (0.115 R)
• M45: 8,989,186 km (0.053 R)
• M46: 9,078,945 km (0.097 R)
• M47: 9,532,825 km (0.034 R)
• M48: 10,344,842 km (0.112 R)
• M49: 10,723,475 km (0.036 R)
• M50: 10,842,704 km (0.119 R)
• M51: 11,010,403 km (0.12 R)
• M52: 11,494,352 km (0.11 R)
• M53: 11,665,343 km (0.086 R)
• M54: 12,009,867 km (0.092 R)
• M55: 12,382,814 km (0.11 R)
• M56: 12,508,028 km (0.085 R)
• M57: 12,885,912 km (0.113 R)
• M58: 13,191,091 km (0.1 R)
• M59: 13,267,686 km (0.089 R)
• M60: 13,370,160 km (0.101 R)
• M61: 13,472,934 km (0.071 R)
• M62: 13,756,571 km (0.115 R)
• M63: 13,912,303 km (0.118 R)
• M64: 14,646,230 km (0.102 R)
• M65: 15,017,981 km (0.087 R)
• M66: 15,365,945 km (0.063 R)
• M67: 15,988,123 km (0.041 R)
• M68: 16,316,041 km (0.081 R)
• M69: 16,839,784 km (0.099 R)
• M70: 16,978,461 km (0.117 R)
• M71: 17,368,911 km (0.086 R)
• M72: 18,130,364 km (0.06 R)
• M73: 18,730,102 km (0.043 R)
• M74: 18,902,738 km (0.114 R)
• M75: 19,191,462 km (0.099 R)
• M76: 19,510,853 km (0.03 R)

Planet 6 - Ice Giant

Semi-Major Axis: 7.46 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 774.9

Radius: 4.1

Gravity: 46.1 G

Time & Orbit

Eccentricity (e): 0.034

Orbit Range: 7.21 AU - 7.71 AU

Year: 13366 Days

Day: 18.8 Hours

Environment

Temp: -234 °C

Axial Tilt: 37.8 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (93)

Outer Limit: 49,394,227 km

• M1: 52,958 km (0.117 R)
• M2: 235,317 km (0.039 R)
• M3: 381,475 km (0.106 R)
• M4: 810,820 km (0.079 R)
• M5: 1,054,515 km (0.102 R)
• M6: 1,148,463 km (0.115 R)
• M7: 1,245,253 km (0.055 R)
• M8: 1,319,603 km (0.111 R)
• M9: 1,395,449 km (0.057 R)
• M10: 2,200,136 km (0.061 R)
• M11: 2,505,465 km (0.115 R)
• M12: 2,759,183 km (0.103 R)
• M13: 2,988,068 km (0.059 R)
• M14: 3,087,999 km (0.06 R)
• M15: 3,188,978 km (0.103 R)
• M16: 3,291,153 km (0.117 R)
• M17: 3,639,417 km (0.058 R)
• M18: 3,746,080 km (0.068 R)
• M19: 4,257,855 km (0.1 R)
• M20: 4,483,897 km (0.089 R)
• M21: 4,560,042 km (0.119 R)
• M22: 6,256,781 km (0.102 R)
• M23: 6,643,193 km (0.118 R)
• M24: 7,259,685 km (0.085 R)
• M25: 7,756,650 km (0.104 R)
• M26: 7,802,427 km (0.088 R)
• M27: 7,986,282 km (0.053 R)
• M28: 8,688,196 km (0.1 R)
• M29: 8,783,340 km (0.12 R)
• M30: 9,118,888 km (0.082 R)
• M31: 11,166,583 km (0.107 R)
• M32: 11,373,777 km (0.045 R)
• M33: 12,268,073 km (0.076 R)
• M34: 12,428,292 km (0.085 R)
• M35: 13,075,901 km (0.098 R)
• M36: 13,679,080 km (0.086 R)
• M37: 14,011,935 km (0.057 R)
• M38: 14,291,234 km (0.107 R)
• M39: 14,855,517 km (0.068 R)
• M40: 16,180,954 km (0.12 R)
• M41: 16,650,692 km (0.119 R)
• M42: 17,244,147 km (0.108 R)
• M43: 17,303,986 km (0.108 R)
• M44: 17,423,664 km (0.115 R)
• M45: 18,390,814 km (0.102 R)
• M46: 18,451,850 km (0.03 R)
• M47: 20,820,433 km (0.1 R)
• M48: 20,884,012 km (0.108 R)
• M49: 21,523,693 km (0.092 R)
• M50: 22,625,930 km (0.098 R)
• M51: 24,012,553 km (0.117 R)
• M52: 24,817,090 km (0.068 R)
• M53: 24,952,177 km (0.118 R)
• M54: 25,494,469 km (0.094 R)
• M55: 26,177,683 km (0.026 R)
• M56: 26,246,348 km (0.119 R)
• M57: 26,452,793 km (0.106 R)
• M58: 26,659,687 km (0.058 R)
• M59: 26,797,915 km (0.06 R)
• M60: 27,005,707 km (0.111 R)
• M61: 27,842,109 km (0.104 R)
• M62: 28,616,427 km (0.082 R)
• M63: 29,041,734 km (0.1 R)
• M64: 29,970,288 km (0.081 R)
• M65: 31,272,088 km (0.112 R)
• M66: 32,518,388 km (0.113 R)
• M67: 33,780,845 km (0.102 R)
• M68: 34,155,139 km (0.053 R)
• M69: 35,438,240 km (0.042 R)
• M70: 35,590,231 km (0.083 R)
• M71: 36,200,291 km (0.119 R)
• M72: 36,276,885 km (0.116 R)
• M73: 36,583,411 km (0.115 R)
• M74: 36,660,155 km (0.12 R)
• M75: 39,459,580 km (0.117 R)
• M76: 40,407,881 km (0.113 R)
• M77: 40,964,535 km (0.11 R)
• M78: 41,283,776 km (0.036 R)
• M79: 44,030,244 km (0.119 R)
• M80: 44,275,435 km (0.117 R)
• M81: 45,921,460 km (0.092 R)
• M82: 47,168,957 km (0.096 R)
• M83: 47,419,832 km (0.062 R)
• M84: 49,188,229 km (0.046 R)
• M85: 50,293,607 km (0.096 R)
• M86: 51,923,925 km (0.063 R)
• M87: 53,049,350 km (0.108 R)
• M88: 55,148,208 km (0.105 R)
• M89: 56,473,645 km (0.106 R)
• M90: 58,257,300 km (0.109 R)
• M91: 58,526,427 km (0.109 R)
• M92: 58,975,819 km (0.08 R)
• M93: 59,697,329 km (0.044 R)

Planet 7 - Ice Giant

Semi-Major Axis: 10.3 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 159.4

Radius: 5

Gravity: 6.38 G

Time & Orbit

Eccentricity (e): 0.065

Orbit Range: 9.63 AU - 10.97 AU

Year: 21685 Days

Day: 24.4 Hours

Environment

Temp: -237 °C

Axial Tilt: 27.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (92)

Outer Limit: 49,394,227 km

• M1: 104,270 km (0.067 R)
• M2: 201,658 km (0.114 R)
• M3: 281,094 km (0.085 R)
• M4: 564,882 km (0.089 R)
• M5: 715,975 km (0.106 R)
• M6: 787,184 km (0.102 R)
• M7: 842,236 km (0.115 R)
• M8: 1,015,321 km (0.113 R)
• M9: 1,306,289 km (0.102 R)
• M10: 1,349,971 km (0.076 R)
• M11: 1,461,272 km (0.081 R)
• M12: 1,552,527 km (0.112 R)
• M13: 1,764,656 km (0.069 R)
• M14: 2,112,920 km (0.082 R)
• M15: 2,427,973 km (0.102 R)
• M16: 2,729,862 km (0.04 R)
• M17: 2,985,674 km (0.111 R)
• M18: 3,278,886 km (0.103 R)
• M19: 3,892,537 km (0.055 R)
• M20: 3,955,816 km (0.119 R)
• M21: 4,147,751 km (0.095 R)
• M22: 4,843,530 km (0.118 R)
• M23: 4,945,855 km (0.071 R)
• M24: 5,257,168 km (0.05 R)
• M25: 5,898,644 km (0.032 R)
• M26: 6,191,706 km (0.115 R)
• M27: 7,332,240 km (0.079 R)
• M28: 7,410,480 km (0.051 R)
• M29: 7,926,294 km (0.084 R)
• M30: 8,087,410 km (0.096 R)
• M31: 8,168,193 km (0.114 R)
• M32: 10,146,027 km (0.108 R)
• M33: 10,277,075 km (0.097 R)
• M34: 10,540,816 km (0.065 R)
• M35: 11,755,251 km (0.112 R)
• M36: 12,216,162 km (0.109 R)
• M37: 12,355,587 km (0.1 R)
• M38: 12,965,947 km (0.05 R)
• M39: 13,778,712 km (0.084 R)
• M40: 14,460,429 km (0.06 R)
• M41: 14,904,436 km (0.095 R)
• M42: 15,403,046 km (0.118 R)
• M43: 16,008,468 km (0.1 R)
• M44: 16,263,084 km (0.108 R)
• M45: 19,965,182 km (0.071 R)
• M46: 20,074,688 km (0.108 R)
• M47: 20,790,962 km (0.099 R)
• M48: 21,291,816 km (0.104 R)
• M49: 21,347,616 km (0.117 R)
• M50: 21,740,311 km (0.091 R)
• M51: 22,760,718 km (0.119 R)
• M52: 22,875,160 km (0.093 R)
• M53: 23,334,425 km (0.114 R)
• M54: 24,087,202 km (0.075 R)
• M55: 24,613,188 km (0.095 R)
• M56: 24,730,473 km (0.103 R)
• M57: 24,965,790 km (0.093 R)
• M58: 25,379,428 km (0.091 R)
• M59: 25,914,540 km (0.099 R)
• M60: 27,663,788 km (0.045 R)
• M61: 27,969,117 km (0.081 R)
• M62: 29,140,020 km (0.099 R)
• M63: 29,202,103 km (0.11 R)
• M64: 30,138,286 km (0.119 R)
• M65: 30,326,780 km (0.101 R)
• M66: 30,704,813 km (0.109 R)
• M67: 33,524,434 km (0.107 R)
• M68: 33,719,659 km (0.057 R)
• M69: 33,915,333 km (0.088 R)
• M70: 34,176,681 km (0.102 R)
• M71: 34,438,776 km (0.1 R)
• M72: 35,229,102 km (0.088 R)
• M73: 36,358,715 km (0.12 R)
• M74: 37,770,620 km (0.05 R)
• M75: 37,906,006 km (0.098 R)
• M76: 38,313,211 km (0.099 R)
• M77: 38,517,263 km (0.068 R)
• M78: 39,680,835 km (0.071 R)
• M79: 39,749,650 km (0.11 R)
• M80: 40,163,288 km (0.096 R)
• M81: 41,064,466 km (0.045 R)
• M82: 41,273,305 km (0.112 R)
• M83: 41,482,592 km (0.076 R)
• M84: 41,762,190 km (0.062 R)
• M85: 41,832,053 km (0.092 R)
• M86: 42,745,497 km (0.069 R)
• M87: 43,098,548 km (0.066 R)
• M88: 45,093,436 km (0.082 R)
• M89: 45,165,243 km (0.105 R)
• M90: 45,237,050 km (0.09 R)
• M91: 47,190,948 km (0.047 R)
• M92: 47,995,036 km (0.056 R)

Kuiper Belt

Range: 30 - 50 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 172 - 19,870 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit