🌌 Stone's Star System Generator

Planet 1 - Terrestrial

Semi-Major Axis: 0.91 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 1.71

Radius: 1.24

Gravity: 1.11 G

Time & Orbit

Eccentricity (e): 0.096

Orbit Range: 0.82 AU - 1 AU

Year: 371 Days

Day: 18.1 Hours

Environment

Temp: -44 °C

Axial Tilt: 0.1 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Planet 2 - Terrestrial

Semi-Major Axis: 1.99 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 4.27

Radius: 1.79

Gravity: 1.33 G

Time & Orbit

Eccentricity (e): 0.015

Orbit Range: 1.96 AU - 2.02 AU

Year: 1200 Days

Day: 20 Hours

Environment

Temp: -104 °C

Axial Tilt: 27.8 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Asteroid Belt

Center: 2.49 AU

Composition

Type: Main (Rocky/Icy Mix)

A dense region of planetesimals and debris.

Boundary

Planet 3 - Gas Giant

Semi-Major Axis: 2.99 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 198.8

Radius: 9.8

Gravity: 2.07 G

Time & Orbit

Eccentricity (e): 0.213

Orbit Range: 2.35 AU - 3.63 AU

Year: 2210 Days

Day: 8.8 Hours

Environment

Temp: -135 °C

Axial Tilt: 25.1 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (73)

Outer Limit: 79,823,229 km

• M1: 156,779 km (0.092 R)
• M2: 254,017 km (0.072 R)
• M3: 316,549 km (0.107 R)
• M4: 401,371 km (0.059 R)
• M5: 569,519 km (0.095 R)
• M6: 635,342 km (0.039 R)
• M7: 749,186 km (0.099 R)
• M8: 1,020,557 km (0.111 R)
• M9: 1,087,577 km (0.081 R)
• M10: 1,148,612 km (0.103 R)
• M11: 1,226,553 km (0.087 R)
• M12: 1,355,207 km (0.075 R)
• M13: 1,513,930 km (0.091 R)
• M14: 1,831,826 km (0.111 R)
• M15: 1,914,554 km (0.112 R)
• M16: 2,017,477 km (0.114 R)
• M17: 2,103,196 km (0.113 R)
• M18: 2,337,616 km (0.08 R)
• M19: 2,529,401 km (0.099 R)
• M20: 2,632,474 km (0.094 R)
• M21: 2,896,215 km (0.1 R)
• M22: 2,960,841 km (0.084 R)
• M23: 3,190,773 km (0.104 R)
• M24: 3,785,275 km (0.052 R)
• M25: 3,891,789 km (0.094 R)
• M26: 4,107,509 km (0.091 R)
• M27: 4,192,630 km (0.076 R)
• M28: 4,327,418 km (0.102 R)
• M29: 4,401,469 km (0.092 R)
• M30: 4,576,199 km (0.11 R)
• M31: 4,639,180 km (0.086 R)
• M32: 4,804,186 km (0.092 R)
• M33: 4,932,391 km (0.101 R)
• M34: 5,035,913 km (0.107 R)
• M35: 5,100,839 km (0.073 R)
• M36: 5,244,901 km (0.096 R)
• M37: 5,324,188 km (0.106 R)
• M38: 5,456,882 km (0.105 R)
• M39: 5,537,216 km (0.098 R)
• M40: 5,617,849 km (0.104 R)
• M41: 5,725,859 km (0.104 R)
• M42: 5,807,389 km (0.047 R)
• M43: 5,985,411 km (0.099 R)
• M44: 6,054,375 km (0.093 R)
• M45: 6,207,115 km (0.12 R)
• M46: 6,290,890 km (0.098 R)
• M47: 6,389,175 km (0.112 R)
• M48: 6,487,910 km (0.119 R)
• M49: 6,629,878 km (0.107 R)
• M50: 6,744,171 km (0.118 R)
• M51: 6,873,723 km (0.119 R)
• M52: 6,989,362 km (0.11 R)
• M53: 7,149,581 km (0.083 R)
• M54: 7,222,884 km (0.083 R)
• M55: 7,325,808 km (0.042 R)
• M56: 7,742,438 km (0.106 R)
• M57: 7,847,904 km (0.047 R)
• M58: 8,166,847 km (0.088 R)
• M59: 8,490,278 km (0.12 R)
• M60: 8,770,774 km (0.098 R)
• M61: 8,943,709 km (0.055 R)
• M62: 9,133,548 km (0.092 R)
• M63: 9,340,891 km (0.108 R)
• M64: 9,760,064 km (0.104 R)
• M65: 10,070,330 km (0.1 R)
• M66: 10,201,976 km (0.12 R)
• M67: 10,317,616 km (0.09 R)
• M68: 10,433,703 km (0.046 R)
• M69: 10,600,356 km (0.108 R)
• M70: 10,919,298 km (0.12 R)
• M71: 11,139,357 km (0.082 R)
• M72: 11,207,424 km (0.072 R)
• M73: 11,412,223 km (0.096 R)

Planet 4 - Gas Giant

Semi-Major Axis: 3.03 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 525.9

Radius: 10.1

Gravity: 5.16 G

Time & Orbit

Eccentricity (e): 0.244

Orbit Range: 2.29 AU - 3.77 AU

Year: 2255 Days

Day: 11.8 Hours

Environment

Temp: -142 °C

Axial Tilt: 14.3 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (72)

Outer Limit: 79,823,229 km

• M1: 158,275 km (0.066 R)
• M2: 305,928 km (0.086 R)
• M3: 457,021 km (0.064 R)
• M4: 568,472 km (0.069 R)
• M5: 762,949 km (0.114 R)
• M6: 864,376 km (0.106 R)
• M7: 1,138,889 km (0.042 R)
• M8: 1,246,449 km (0.112 R)
• M9: 1,722,769 km (0.037 R)
• M10: 1,882,091 km (0.085 R)
• M11: 2,389,078 km (0.116 R)
• M12: 2,490,356 km (0.081 R)
• M13: 2,593,279 km (0.109 R)
• M14: 2,736,893 km (0.07 R)
• M15: 2,829,793 km (0.104 R)
• M16: 3,128,690 km (0.067 R)
• M17: 3,239,841 km (0.054 R)
• M18: 3,324,065 km (0.054 R)
• M19: 3,741,892 km (0.119 R)
• M20: 3,830,453 km (0.097 R)
• M21: 4,130,846 km (0.072 R)
• M22: 4,361,077 km (0.083 R)
• M23: 4,548,374 km (0.042 R)
• M24: 4,754,370 km (0.108 R)
• M25: 5,060,896 km (0.115 R)
• M26: 5,142,726 km (0.094 R)
• M27: 5,390,610 km (0.084 R)
• M28: 5,457,330 km (0.101 R)
• M29: 5,591,819 km (0.079 R)
• M30: 5,898,345 km (0.108 R)
• M31: 6,140,544 km (0.116 R)
• M32: 6,262,765 km (0.088 R)
• M33: 6,386,034 km (0.089 R)
• M34: 6,545,505 km (0.086 R)
• M35: 6,977,394 km (0.097 R)
• M36: 7,196,854 km (0.081 R)
• M37: 7,307,407 km (0.099 R)
• M38: 7,549,008 km (0.104 R)
• M39: 7,717,754 km (0.064 R)
• M40: 7,793,151 km (0.051 R)
• M41: 7,944,694 km (0.08 R)
• M42: 8,193,176 km (0.104 R)
• M43: 8,521,843 km (0.1 R)
• M44: 8,619,381 km (0.092 R)
• M45: 8,717,367 km (0.118 R)
• M46: 8,953,732 km (0.09 R)
• M47: 9,332,514 km (0.086 R)
• M48: 9,534,022 km (0.05 R)
• M49: 9,941,227 km (0.076 R)
• M50: 10,291,885 km (0.04 R)
• M51: 10,395,855 km (0.104 R)
• M52: 10,479,181 km (0.095 R)
• M53: 10,625,638 km (0.054 R)
• M54: 10,878,308 km (0.069 R)
• M55: 10,962,981 km (0.085 R)
• M56: 11,540,279 km (0.108 R)
• M57: 12,325,219 km (0.074 R)
• M58: 13,015,164 km (0.091 R)
• M59: 13,127,512 km (0.077 R)
• M60: 13,195,131 km (0.062 R)
• M61: 13,353,405 km (0.101 R)
• M62: 13,900,784 km (0.081 R)
• M63: 14,038,713 km (0.118 R)
• M64: 14,223,317 km (0.088 R)
• M65: 14,292,880 km (0.101 R)
• M66: 14,432,155 km (0.087 R)
• M67: 14,665,229 km (0.116 R)
• M68: 14,899,649 km (0.104 R)
• M69: 15,300,870 km (0.075 R)
• M70: 15,491,009 km (0.081 R)
• M71: 15,586,303 km (0.066 R)
• M72: 16,210,874 km (0.061 R)

Asteroid Belt

Center: 3.58 AU

Composition

Type: Outer System (Icy)

A dense region of planetesimals and debris.

Boundary

Planet 5 - Gas Giant

Semi-Major Axis: 4.13 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 558

Radius: 11.7

Gravity: 4.08 G

Time & Orbit

Eccentricity (e): 0.225

Orbit Range: 3.2 AU - 5.06 AU

Year: 3588 Days

Day: 7.5 Hours

Environment

Temp: -163 °C

Axial Tilt: 25.8 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (62)

Outer Limit: 79,823,229 km

• M1: 199,713 km (0.115 R)
• M2: 345,721 km (0.101 R)
• M3: 606,769 km (0.115 R)
• M4: 823,985 km (0.077 R)
• M5: 1,259,464 km (0.096 R)
• M6: 1,424,172 km (0.114 R)
• M7: 1,719,628 km (0.113 R)
• M8: 2,020,170 km (0.095 R)
• M9: 2,245,314 km (0.089 R)
• M10: 2,542,416 km (0.112 R)
• M11: 2,655,213 km (0.069 R)
• M12: 3,140,059 km (0.077 R)
• M13: 3,526,620 km (0.099 R)
• M14: 3,725,585 km (0.112 R)
• M15: 3,798,888 km (0.057 R)
• M16: 3,946,990 km (0.111 R)
• M17: 4,287,325 km (0.112 R)
• M18: 4,956,177 km (0.056 R)
• M19: 5,302,796 km (0.088 R)
• M20: 5,976,884 km (0.069 R)
• M21: 6,063,052 km (0.093 R)
• M22: 6,346,091 km (0.112 R)
• M23: 6,655,609 km (0.074 R)
• M24: 6,857,267 km (0.083 R)
• M25: 6,992,952 km (0.056 R)
• M26: 7,966,984 km (0.086 R)
• M27: 8,325,122 km (0.096 R)
• M28: 8,494,167 km (0.034 R)
• M29: 8,737,563 km (0.06 R)
• M30: 8,909,301 km (0.108 R)
• M31: 9,406,265 km (0.114 R)
• M32: 9,861,192 km (0.105 R)
• M33: 9,963,218 km (0.114 R)
• M34: 10,142,736 km (0.091 R)
• M35: 10,531,092 km (0.066 R)
• M36: 10,871,576 km (0.06 R)
• M37: 11,349,093 km (0.029 R)
• M38: 11,563,467 km (0.085 R)
• M39: 11,725,182 km (0.095 R)
• M40: 12,050,856 km (0.105 R)
• M41: 12,933,783 km (0.12 R)
• M42: 13,467,997 km (0.071 R)
• M43: 13,780,657 km (0.105 R)
• M44: 13,952,096 km (0.035 R)
• M45: 14,703,526 km (0.118 R)
• M46: 15,349,639 km (0.114 R)
• M47: 17,219,912 km (0.077 R)
• M48: 17,590,166 km (0.107 R)
• M49: 18,119,294 km (0.055 R)
• M50: 18,213,242 km (0.055 R)
• M51: 18,433,001 km (0.06 R)
• M52: 18,622,093 km (0.059 R)
• M53: 19,673,466 km (0.114 R)
• M54: 20,028,163 km (0.108 R)
• M55: 20,417,716 km (0.07 R)
• M56: 20,711,376 km (0.032 R)
• M57: 20,940,710 km (0.111 R)
• M58: 21,072,206 km (0.117 R)
• M59: 22,100,542 km (0.074 R)
• M60: 22,200,922 km (0.078 R)
• M61: 22,301,452 km (0.061 R)
• M62: 22,502,961 km (0.037 R)

Planet 6 - Gas Giant

Semi-Major Axis: 6.45 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 164.7

Radius: 8.4

Gravity: 2.33 G

Time & Orbit

Eccentricity (e): 0.048

Orbit Range: 6.14 AU - 6.76 AU

Year: 7003 Days

Day: 6.2 Hours

Environment

Temp: -185 °C

Axial Tilt: 36.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (66)

Outer Limit: 79,823,229 km

• M1: 105,167 km (0.096 R)
• M2: 244,742 km (0.094 R)
• M3: 439,818 km (0.034 R)
• M4: 492,177 km (0.03 R)
• M5: 757,414 km (0.067 R)
• M6: 1,113,906 km (0.095 R)
• M7: 1,587,981 km (0.038 R)
• M8: 1,773,632 km (0.076 R)
• M9: 1,876,556 km (0.042 R)
• M10: 2,166,028 km (0.068 R)
• M11: 2,324,302 km (0.108 R)
• M12: 2,469,861 km (0.118 R)
• M13: 2,568,595 km (0.079 R)
• M14: 2,753,199 km (0.117 R)
• M15: 2,942,141 km (0.118 R)
• M16: 3,135,422 km (0.083 R)
• M17: 3,608,600 km (0.106 R)
• M18: 3,834,642 km (0.059 R)
• M19: 4,162,860 km (0.059 R)
• M20: 4,300,640 km (0.037 R)
• M21: 4,661,918 km (0.114 R)
• M22: 5,137,789 km (0.068 R)
• M23: 5,477,975 km (0.114 R)
• M24: 5,803,649 km (0.093 R)
• M25: 6,360,303 km (0.12 R)
• M26: 6,496,437 km (0.115 R)
• M27: 6,679,545 km (0.105 R)
• M28: 7,910,436 km (0.095 R)
• M29: 8,526,929 km (0.116 R)
• M30: 9,389,959 km (0.051 R)
• M31: 9,570,973 km (0.073 R)
• M32: 9,727,302 km (0.064 R)
• M33: 10,387,029 km (0.106 R)
• M34: 10,682,036 km (0.066 R)
• M35: 10,816,973 km (0.103 R)
• M36: 10,925,432 km (0.1 R)
• M37: 11,225,375 km (0.117 R)
• M38: 11,500,336 km (0.1 R)
• M39: 12,141,363 km (0.107 R)
• M40: 12,338,832 km (0.055 R)
• M41: 14,311,131 km (0.118 R)
• M42: 14,519,670 km (0.114 R)
• M43: 14,819,315 km (0.073 R)
• M44: 15,303,114 km (0.113 R)
• M45: 15,516,291 km (0.076 R)
• M46: 15,638,662 km (0.109 R)
• M47: 15,884,302 km (0.101 R)
• M48: 15,976,753 km (0.11 R)
• M49: 16,038,388 km (0.099 R)
• M50: 16,317,089 km (0.07 R)
• M51: 16,535,053 km (0.041 R)
• M52: 16,910,842 km (0.049 R)
• M53: 17,162,915 km (0.1 R)
• M54: 18,022,953 km (0.109 R)
• M55: 18,280,411 km (0.095 R)
• M56: 18,441,977 km (0.104 R)
• M57: 18,864,291 km (0.095 R)
• M58: 18,962,129 km (0.111 R)
• M59: 19,421,244 km (0.106 R)
• M60: 19,520,129 km (0.073 R)
• M61: 19,718,346 km (0.084 R)
• M62: 20,854,242 km (0.081 R)
• M63: 21,226,292 km (0.037 R)
• M64: 22,424,721 km (0.079 R)
• M65: 22,805,747 km (0.117 R)
• M66: 22,910,166 km (0.119 R)

Planet 7 - Gas Giant

Semi-Major Axis: 7.89 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 90.6

Radius: 8.4

Gravity: 1.28 G

Time & Orbit

Eccentricity (e): 0.113

Orbit Range: 7 AU - 8.78 AU

Year: 9474 Days

Day: 14.9 Hours

Environment

Temp: -182 °C

Axial Tilt: 36.7 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (61)

Outer Limit: 79,823,229 km

• M1: 135,236 km (0.089 R)
• M2: 238,758 km (0.112 R)
• M3: 415,284 km (0.088 R)
• M4: 493,075 km (0.101 R)
• M5: 645,216 km (0.097 R)
• M6: 758,910 km (0.069 R)
• M7: 813,064 km (0.104 R)
• M8: 960,119 km (0.089 R)
• M9: 1,079,349 km (0.101 R)
• M10: 1,191,098 km (0.104 R)
• M11: 1,254,977 km (0.068 R)
• M12: 1,333,067 km (0.026 R)
• M13: 1,549,535 km (0.107 R)
• M14: 2,016,280 km (0.063 R)
• M15: 2,108,582 km (0.067 R)
• M16: 2,217,938 km (0.104 R)
• M17: 2,442,634 km (0.102 R)
• M18: 2,810,495 km (0.119 R)
• M19: 2,913,867 km (0.095 R)
• M20: 3,542,328 km (0.051 R)
• M21: 3,805,171 km (0.063 R)
• M22: 3,919,763 km (0.045 R)
• M23: 4,350,007 km (0.097 R)
• M24: 4,490,180 km (0.118 R)
• M25: 4,836,499 km (0.059 R)
• M26: 5,002,553 km (0.071 R)
• M27: 5,107,271 km (0.11 R)
• M28: 5,212,738 km (0.047 R)
• M29: 5,663,626 km (0.053 R)
• M30: 5,926,918 km (0.033 R)
• M31: 6,533,986 km (0.092 R)
• M32: 6,717,692 km (0.118 R)
• M33: 6,856,669 km (0.08 R)
• M34: 7,637,570 km (0.1 R)
• M35: 7,709,975 km (0.112 R)
• M36: 7,855,384 km (0.1 R)
• M37: 8,446,445 km (0.072 R)
• M38: 8,797,851 km (0.05 R)
• M39: 9,411,352 km (0.113 R)
• M40: 9,827,982 km (0.089 R)
• M41: 10,250,745 km (0.037 R)
• M42: 10,544,855 km (0.09 R)
• M43: 11,168,678 km (0.076 R)
• M44: 11,416,113 km (0.039 R)
• M45: 11,804,469 km (0.082 R)
• M46: 11,916,368 km (0.089 R)
• M47: 12,765,934 km (0.089 R)
• M48: 12,851,953 km (0.104 R)
• M49: 13,401,276 km (0.118 R)
• M50: 13,459,620 km (0.109 R)
• M51: 13,928,759 km (0.088 R)
• M52: 15,982,438 km (0.073 R)
• M53: 16,918,023 km (0.113 R)
• M54: 17,647,462 km (0.082 R)
• M55: 18,257,672 km (0.114 R)
• M56: 19,399,852 km (0.064 R)
• M57: 19,631,130 km (0.119 R)
• M58: 20,129,590 km (0.103 R)
• M59: 22,165,169 km (0.106 R)
• M60: 22,614,710 km (0.063 R)
• M61: 22,927,818 km (0.11 R)

Planet 8 - Ice Giant

Semi-Major Axis: 16.86 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 361.2

Radius: 3.8

Gravity: 25.01 G

Time & Orbit

Eccentricity (e): 0.113

Orbit Range: 14.95 AU - 18.77 AU

Year: 29595 Days

Day: 19.6 Hours

Environment

Temp: -210 °C

Axial Tilt: 19.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (75)

Outer Limit: 79,823,229 km

• M1: 179,368 km (0.099 R)
• M2: 239,955 km (0.112 R)
• M3: 401,221 km (0.085 R)
• M4: 461,809 km (0.111 R)
• M5: 638,185 km (0.05 R)
• M6: 685,457 km (0.095 R)
• M7: 1,369,269 km (0.077 R)
• M8: 1,524,701 km (0.092 R)
• M9: 1,653,206 km (0.073 R)
• M10: 1,852,321 km (0.092 R)
• M11: 1,920,537 km (0.091 R)
• M12: 2,646,087 km (0.118 R)
• M13: 4,136,980 km (0.113 R)
• M14: 4,452,033 km (0.109 R)
• M15: 5,057,455 km (0.118 R)
• M16: 5,105,177 km (0.069 R)
• M17: 5,200,920 km (0.084 R)
• M18: 7,451,919 km (0.117 R)
• M19: 7,779,388 km (0.091 R)
• M20: 10,199,284 km (0.112 R)
• M21: 11,489,116 km (0.12 R)
• M22: 12,570,410 km (0.077 R)
• M23: 12,634,887 km (0.096 R)
• M24: 13,352,956 km (0.106 R)
• M25: 13,418,779 km (0.062 R)
• M26: 13,683,568 km (0.108 R)
• M27: 14,353,018 km (0.101 R)
• M28: 14,691,857 km (0.099 R)
• M29: 14,827,991 km (0.113 R)
• M30: 15,377,165 km (0.052 R)
• M31: 16,072,795 km (0.116 R)
• M32: 16,142,957 km (0.12 R)
• M33: 17,350,660 km (0.042 R)
• M34: 17,566,829 km (0.094 R)
• M35: 18,956,294 km (0.091 R)
• M36: 19,178,896 km (0.114 R)
• M37: 19,851,937 km (0.102 R)
• M38: 20,002,582 km (0.103 R)
• M39: 21,144,163 km (0.114 R)
• M40: 21,916,836 km (0.112 R)
• M41: 22,620,245 km (0.098 R)
• M42: 22,698,784 km (0.116 R)
• M43: 28,846,658 km (0.116 R)
• M44: 31,879,755 km (0.115 R)
• M45: 32,321,218 km (0.114 R)
• M46: 36,476,898 km (0.063 R)
• M47: 39,559,661 km (0.038 R)
• M48: 40,605,649 km (0.116 R)
• M49: 43,602,095 km (0.057 R)
• M50: 43,993,891 km (0.103 R)
• M51: 45,870,896 km (0.089 R)
• M52: 46,769,082 km (0.062 R)
• M53: 48,988,815 km (0.091 R)
• M54: 49,396,170 km (0.114 R)
• M55: 51,759,666 km (0.112 R)
• M56: 52,903,043 km (0.1 R)
• M57: 56,382,689 km (0.076 R)
• M58: 56,916,305 km (0.037 R)
• M59: 57,237,342 km (0.03 R)
• M60: 58,527,325 km (0.118 R)
• M61: 59,284,290 km (0.1 R)
• M62: 59,935,639 km (0.118 R)
• M63: 61,903,748 km (0.103 R)
• M64: 63,338,392 km (0.051 R)
• M65: 63,671,098 km (0.081 R)
• M66: 64,672,506 km (0.075 R)
• M67: 65,903,397 km (0.079 R)
• M68: 66,240,441 km (0.095 R)
• M69: 68,502,062 km (0.105 R)
• M70: 69,528,004 km (0.102 R)
• M71: 69,756,739 km (0.111 R)
• M72: 70,559,032 km (0.099 R)
• M73: 72,752,137 km (0.031 R)
• M74: 78,748,618 km (0.075 R)
• M75: 79,225,686 km (0.118 R)

Kuiper Belt

Range: 30 - 46 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 485 - 16,683 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit