🌌 Stone's Star System Generator

Planet 1 - Terrestrial

Semi-Major Axis: 0.91 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 2.18

Radius: 1.37

Gravity: 1.16 G

Time & Orbit

Eccentricity (e): 0.038

Orbit Range: 0.88 AU - 0.94 AU

Year: 382 Days

Day: 38.3 Hours

Environment

Temp: -59 °C

Axial Tilt: 22.4 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Planet 2 - Terrestrial

Semi-Major Axis: 1.58 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 4.42

Radius: 1.81

Gravity: 1.35 G

Time & Orbit

Eccentricity (e): 0.002

Orbit Range: 1.58 AU - 1.58 AU

Year: 873 Days

Day: 29.8 Hours

Environment

Temp: -113 °C

Axial Tilt: 1.3 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Planet 3 - Terrestrial

Semi-Major Axis: 1.75 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 0.85

Radius: 0.94

Gravity: 0.96 G

Time & Orbit

Eccentricity (e): 0.224

Orbit Range: 1.36 AU - 2.14 AU

Year: 1018 Days

Day: 47.4 Hours

Environment

Temp: -113 °C

Axial Tilt: 22.3 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Satellites (1)

Outer Limit: 40,662,178 km

• M1: 1,075,459 km (0.101 R)

Planet 4 - Terrestrial

Semi-Major Axis: 1.78 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 1.56

Radius: 1.19

Gravity: 1.1 G

Time & Orbit

Eccentricity (e): 0.006

Orbit Range: 1.77 AU - 1.79 AU

Year: 1044 Days

Day: 43 Hours

Environment

Temp: -105 °C

Axial Tilt: 20.7 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Planet 5 - Terrestrial

Semi-Major Axis: 2.29 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 2.73

Radius: 1.49

Gravity: 1.23 G

Time & Orbit

Eccentricity (e): 0.084

Orbit Range: 2.1 AU - 2.48 AU

Year: 1524 Days

Day: 31.5 Hours

Environment

Temp: -136 °C

Axial Tilt: 6.1 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Asteroid Belt

Center: 2.7 AU

Composition

Type: Main (Rocky/Icy Mix)

A dense region of planetesimals and debris.

Boundary

Planet 6 - Gas Giant

Semi-Major Axis: 3.11 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 933.1

Radius: 9.9

Gravity: 9.52 G

Time & Orbit

Eccentricity (e): 0.195

Orbit Range: 2.5 AU - 3.72 AU

Year: 2412 Days

Day: 9.8 Hours

Environment

Temp: -152 °C

Axial Tilt: 18.3 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (76)

Outer Limit: 40,662,178 km

• M1: 137,780 km (0.103 R)
• M2: 299,196 km (0.117 R)
• M3: 431,440 km (0.089 R)
• M4: 630,256 km (0.115 R)
• M5: 722,259 km (0.083 R)
• M6: 839,394 km (0.103 R)
• M7: 910,752 km (0.106 R)
• M8: 1,071,270 km (0.105 R)
• M9: 1,229,694 km (0.118 R)
• M10: 1,953,449 km (0.101 R)
• M11: 2,205,970 km (0.094 R)
• M12: 2,278,076 km (0.058 R)
• M13: 2,365,591 km (0.101 R)
• M14: 2,619,908 km (0.086 R)
• M15: 2,758,136 km (0.103 R)
• M16: 2,820,369 km (0.101 R)
• M17: 3,090,243 km (0.099 R)
• M18: 3,706,586 km (0.113 R)
• M19: 3,844,815 km (0.063 R)
• M20: 3,914,527 km (0.081 R)
• M21: 3,984,689 km (0.067 R)
• M22: 4,306,025 km (0.111 R)
• M23: 4,506,486 km (0.093 R)
• M24: 4,803,588 km (0.118 R)
• M25: 4,916,684 km (0.107 R)
• M26: 5,011,529 km (0.064 R)
• M27: 5,126,270 km (0.073 R)
• M28: 5,397,342 km (0.117 R)
• M29: 6,014,433 km (0.076 R)
• M30: 6,632,721 km (0.025 R)
• M31: 6,716,795 km (0.088 R)
• M32: 6,970,812 km (0.111 R)
• M33: 7,142,102 km (0.06 R)
• M34: 7,466,879 km (0.12 R)
• M35: 7,532,402 km (0.095 R)
• M36: 7,796,443 km (0.098 R)
• M37: 7,907,444 km (0.077 R)
• M38: 8,447,193 km (0.047 R)
• M39: 8,744,594 km (0.06 R)
• M40: 8,859,934 km (0.112 R)
• M41: 8,998,910 km (0.097 R)
• M42: 9,185,459 km (0.092 R)
• M43: 9,255,770 km (0.099 R)
• M44: 9,396,841 km (0.092 R)
• M45: 9,609,868 km (0.043 R)
• M46: 9,752,734 km (0.096 R)
• M47: 9,824,541 km (0.111 R)
• M48: 9,920,433 km (0.101 R)
• M49: 10,185,670 km (0.071 R)
• M50: 10,748,009 km (0.055 R)
• M51: 11,522,028 km (0.101 R)
• M52: 11,699,152 km (0.034 R)
• M53: 11,800,878 km (0.053 R)
• M54: 12,184,896 km (0.104 R)
• M55: 12,598,983 km (0.055 R)
• M56: 12,938,869 km (0.094 R)
• M57: 13,681,174 km (0.068 R)
• M58: 14,792,985 km (0.116 R)
• M59: 14,985,668 km (0.119 R)
• M60: 15,401,550 km (0.1 R)
• M61: 15,568,950 km (0.076 R)
• M62: 16,500,346 km (0.111 R)
• M63: 16,728,782 km (0.084 R)
• M64: 17,102,477 km (0.105 R)
• M65: 17,188,945 km (0.112 R)
• M66: 17,740,961 km (0.099 R)
• M67: 18,298,662 km (0.043 R)
• M68: 18,416,695 km (0.117 R)
• M69: 18,505,556 km (0.073 R)
• M70: 18,772,738 km (0.048 R)
• M71: 19,011,346 km (0.108 R)
• M72: 19,371,129 km (0.108 R)
• M73: 19,642,350 km (0.071 R)
• M74: 19,823,962 km (0.102 R)
• M75: 20,036,540 km (0.095 R)
• M76: 20,402,606 km (0.099 R)

Planet 7 - Gas Giant

Semi-Major Axis: 3.89 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 576.5

Radius: 14.9

Gravity: 2.6 G

Time & Orbit

Eccentricity (e): 0.045

Orbit Range: 3.71 AU - 4.07 AU

Year: 3374 Days

Day: 6.3 Hours

Environment

Temp: -156 °C

Axial Tilt: 38.7 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (71)

Outer Limit: 40,662,178 km

• M1: 229,334 km (0.079 R)
• M2: 392,844 km (0.103 R)
• M3: 562,488 km (0.113 R)
• M4: 695,929 km (0.106 R)
• M5: 925,113 km (0.09 R)
• M6: 1,044,492 km (0.102 R)
• M7: 1,410,858 km (0.041 R)
• M8: 1,629,570 km (0.095 R)
• M9: 1,777,223 km (0.029 R)
• M10: 2,014,784 km (0.037 R)
• M11: 2,188,916 km (0.031 R)
• M12: 2,368,284 km (0.064 R)
• M13: 2,537,180 km (0.115 R)
• M14: 3,270,060 km (0.062 R)
• M15: 3,616,529 km (0.029 R)
• M16: 4,140,271 km (0.102 R)
• M17: 4,382,918 km (0.086 R)
• M18: 4,611,055 km (0.08 R)
• M19: 4,726,694 km (0.092 R)
• M20: 5,259,113 km (0.08 R)
• M21: 5,440,875 km (0.1 R)
• M22: 5,583,741 km (0.084 R)
• M23: 5,769,391 km (0.056 R)
• M24: 6,189,163 km (0.115 R)
• M25: 6,837,520 km (0.077 R)
• M26: 7,147,487 km (0.082 R)
• M27: 7,326,855 km (0.03 R)
• M28: 7,439,652 km (0.108 R)
• M29: 7,735,706 km (0.111 R)
• M30: 8,012,462 km (0.026 R)
• M31: 8,222,198 km (0.102 R)
• M32: 8,504,789 km (0.091 R)
• M33: 8,790,520 km (0.104 R)
• M34: 8,910,498 km (0.11 R)
• M35: 9,152,248 km (0.076 R)
• M36: 9,273,871 km (0.118 R)
• M37: 9,642,181 km (0.099 R)
• M38: 9,890,364 km (0.108 R)
• M39: 10,241,470 km (0.053 R)
• M40: 10,443,876 km (0.076 R)
• M41: 10,622,197 km (0.081 R)
• M42: 10,878,608 km (0.047 R)
• M43: 10,981,680 km (0.092 R)
• M44: 11,215,053 km (0.109 R)
• M45: 11,423,742 km (0.044 R)
• M46: 11,528,610 km (0.053 R)
• M47: 11,951,374 km (0.094 R)
• M48: 12,111,144 km (0.106 R)
• M49: 12,325,369 km (0.095 R)
• M50: 12,460,007 km (0.045 R)
• M51: 12,812,010 km (0.11 R)
• M52: 13,003,047 km (0.087 R)
• M53: 13,443,164 km (0.112 R)
• M54: 14,281,510 km (0.108 R)
• M55: 14,479,578 km (0.073 R)
• M56: 14,935,702 km (0.086 R)
• M57: 15,136,761 km (0.073 R)
• M58: 15,483,529 km (0.055 R)
• M59: 15,950,125 km (0.118 R)
• M60: 16,628,851 km (0.118 R)
• M61: 17,076,597 km (0.062 R)
• M62: 17,317,001 km (0.085 R)
• M63: 18,382,138 km (0.102 R)
• M64: 18,752,243 km (0.087 R)
• M65: 18,876,259 km (0.1 R)
• M66: 19,156,007 km (0.079 R)
• M67: 19,814,238 km (0.064 R)
• M68: 19,908,933 km (0.116 R)
• M69: 20,067,058 km (0.069 R)
• M70: 20,575,691 km (0.093 R)
• M71: 21,088,662 km (0.119 R)

Planet 8 - Gas Giant

Semi-Major Axis: 7.42 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 721.7

Radius: 11.1

Gravity: 5.86 G

Time & Orbit

Eccentricity (e): 0.21

Orbit Range: 5.86 AU - 8.98 AU

Year: 8887 Days

Day: 7.9 Hours

Environment

Temp: -200 °C

Axial Tilt: 21.4 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (84)

Outer Limit: 40,662,178 km

• M1: 149,448 km (0.113 R)
• M2: 284,685 km (0.098 R)
• M3: 360,082 km (0.052 R)
• M4: 497,563 km (0.079 R)
• M5: 1,024,596 km (0.058 R)
• M6: 1,193,492 km (0.108 R)
• M7: 1,291,478 km (0.111 R)
• M8: 1,580,801 km (0.104 R)
• M9: 1,711,250 km (0.081 R)
• M10: 2,148,375 km (0.11 R)
• M11: 2,568,595 km (0.061 R)
• M12: 3,014,696 km (0.119 R)
• M13: 3,123,155 km (0.079 R)
• M14: 3,233,109 km (0.111 R)
• M15: 3,714,515 km (0.097 R)
• M16: 3,801,880 km (0.114 R)
• M17: 4,038,245 km (0.112 R)
• M18: 4,279,397 km (0.083 R)
• M19: 4,556,602 km (0.046 R)
• M20: 5,128,365 km (0.076 R)
• M21: 5,488,895 km (0.086 R)
• M22: 6,131,269 km (0.084 R)
• M23: 7,671,828 km (0.12 R)
• M24: 8,236,260 km (0.11 R)
• M25: 8,970,487 km (0.068 R)
• M26: 9,765,899 km (0.087 R)
• M27: 10,131,217 km (0.08 R)
• M28: 10,459,734 km (0.103 R)
• M29: 10,542,461 km (0.097 R)
• M30: 10,625,338 km (0.091 R)
• M31: 10,917,204 km (0.099 R)
• M32: 11,381,256 km (0.09 R)
• M33: 11,637,069 km (0.081 R)
• M34: 11,722,788 km (0.1 R)
• M35: 12,372,342 km (0.117 R)
• M36: 13,346,075 km (0.045 R)
• M37: 13,887,619 km (0.106 R)
• M38: 14,252,638 km (0.054 R)
• M39: 14,390,268 km (0.067 R)
• M40: 14,528,496 km (0.052 R)
• M41: 14,713,399 km (0.113 R)
• M42: 15,838,974 km (0.066 R)
• M43: 16,076,984 km (0.063 R)
• M44: 18,321,850 km (0.094 R)
• M45: 18,521,712 km (0.049 R)
• M46: 19,889,336 km (0.065 R)
• M47: 21,027,776 km (0.116 R)
• M48: 21,710,241 km (0.098 R)
• M49: 22,027,838 km (0.093 R)
• M50: 22,720,925 km (0.104 R)
• M51: 23,367,187 km (0.105 R)
• M52: 24,677,814 km (0.08 R)
• M53: 25,119,876 km (0.107 R)
• M54: 25,900,029 km (0.051 R)
• M55: 26,180,525 km (0.079 R)
• M56: 27,312,682 km (0.039 R)
• M57: 28,345,356 km (0.095 R)
• M58: 28,518,590 km (0.088 R)
• M59: 28,924,449 km (0.113 R)
• M60: 30,094,604 km (0.104 R)
• M61: 30,922,777 km (0.077 R)
• M62: 31,041,708 km (0.096 R)
• M63: 33,880,327 km (0.116 R)
• M64: 34,248,637 km (0.091 R)
• M65: 34,371,756 km (0.113 R)
• M66: 34,989,296 km (0.071 R)
• M67: 35,735,191 km (0.068 R)
• M68: 35,860,106 km (0.071 R)
• M69: 36,235,447 km (0.082 R)
• M70: 36,674,965 km (0.093 R)
• M71: 36,800,927 km (0.04 R)
• M72: 37,876,984 km (0.106 R)
• M73: 38,642,776 km (0.051 R)
• M74: 38,770,981 km (0.035 R)
• M75: 39,671,859 km (0.118 R)
• M76: 39,801,112 km (0.098 R)
• M77: 40,449,619 km (0.115 R)
• M78: 40,970,818 km (0.099 R)
• M79: 41,101,566 km (0.059 R)
• M80: 41,625,608 km (0.087 R)
• M81: 41,756,954 km (0.051 R)
• M82: 42,481,906 km (0.049 R)
• M83: 43,011,632 km (0.032 R)
• M84: 44,950,719 km (0.079 R)

Planet 9 - Gas Giant

Semi-Major Axis: 7.47 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 858.4

Radius: 8.3

Gravity: 12.46 G

Time & Orbit

Eccentricity (e): 0.079

Orbit Range: 6.88 AU - 8.06 AU

Year: 8977 Days

Day: 11.8 Hours

Environment

Temp: -185 °C

Axial Tilt: 102.8 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (91)

Outer Limit: 40,662,178 km

• M1: 340,186 km (0.044 R)
• M2: 430,991 km (0.075 R)
• M3: 561,291 km (0.113 R)
• M4: 1,148,612 km (0.115 R)
• M5: 1,229,994 km (0.056 R)
• M6: 1,974,692 km (0.113 R)
• M7: 2,098,110 km (0.066 R)
• M8: 2,249,503 km (0.1 R)
• M9: 2,457,145 km (0.074 R)
• M10: 2,863,303 km (0.085 R)
• M11: 3,031,601 km (0.117 R)
• M12: 3,290,256 km (0.065 R)
• M13: 3,496,551 km (0.056 R)
• M14: 3,767,922 km (0.109 R)
• M15: 4,203,700 km (0.118 R)
• M16: 4,688,397 km (0.115 R)
• M17: 4,920,573 km (0.079 R)
• M18: 5,088,871 km (0.093 R)
• M19: 5,156,639 km (0.114 R)
• M20: 5,362,036 km (0.12 R)
• M21: 5,431,001 km (0.098 R)
• M22: 5,569,978 km (0.039 R)
• M23: 5,851,521 km (0.073 R)
• M24: 6,209,957 km (0.088 R)
• M25: 6,723,826 km (0.102 R)
• M26: 7,061,319 km (0.111 R)
• M27: 7,442,943 km (0.075 R)
• M28: 7,675,119 km (0.074 R)
• M29: 7,753,059 km (0.046 R)
• M30: 8,266,030 km (0.075 R)
• M31: 8,426,100 km (0.041 R)
• M32: 8,546,826 km (0.087 R)
• M33: 8,830,762 km (0.12 R)
• M34: 9,616,899 km (0.109 R)
• M35: 10,253,438 km (0.044 R)
• M36: 11,477,597 km (0.074 R)
• M37: 11,790,855 km (0.042 R)
• M38: 12,380,121 km (0.113 R)
• M39: 12,701,308 km (0.09 R)
• M40: 13,446,006 km (0.063 R)
• M41: 14,637,553 km (0.077 R)
• M42: 14,928,521 km (0.064 R)
• M43: 15,270,502 km (0.113 R)
• M44: 15,368,638 km (0.093 R)
• M45: 16,866,262 km (0.08 R)
• M46: 17,426,955 km (0.098 R)
• M47: 18,619,101 km (0.073 R)
• M48: 18,671,609 km (0.039 R)
• M49: 19,410,773 km (0.117 R)
• M50: 20,267,220 km (0.094 R)
• M51: 21,135,935 km (0.078 R)
• M52: 21,519,803 km (0.033 R)
• M53: 21,906,065 km (0.069 R)
• M54: 23,303,908 km (0.118 R)
• M55: 24,500,391 km (0.11 R)
• M56: 25,019,346 km (0.114 R)
• M57: 25,135,135 km (0.042 R)
• M58: 25,193,029 km (0.106 R)
• M59: 25,892,100 km (0.109 R)
• M60: 26,244,104 km (0.116 R)
• M61: 26,302,896 km (0.066 R)
• M62: 26,952,749 km (0.092 R)
• M63: 27,488,310 km (0.075 R)
• M64: 29,055,198 km (0.111 R)
• M65: 29,359,929 km (0.069 R)
• M66: 29,849,562 km (0.096 R)
• M67: 29,972,382 km (0.061 R)
• M68: 30,589,025 km (0.052 R)
• M69: 31,897,707 km (0.117 R)
• M70: 33,033,903 km (0.09 R)
• M71: 33,415,527 km (0.118 R)
• M72: 33,607,012 km (0.106 R)
• M73: 35,086,385 km (0.096 R)
• M74: 35,866,688 km (0.12 R)
• M75: 36,981,790 km (0.068 R)
• M76: 37,113,736 km (0.117 R)
• M77: 37,643,013 km (0.036 R)
• M78: 37,709,434 km (0.082 R)
• M79: 37,908,699 km (0.101 R)
• M80: 38,508,586 km (0.109 R)
• M81: 38,977,426 km (0.109 R)
• M82: 39,044,446 km (0.103 R)
• M83: 42,242,250 km (0.12 R)
• M84: 42,449,293 km (0.117 R)
• M85: 42,587,372 km (0.094 R)
• M86: 42,656,486 km (0.119 R)
• M87: 43,489,148 km (0.105 R)
• M88: 43,767,849 km (0.111 R)
• M89: 44,677,703 km (0.104 R)
• M90: 46,231,726 km (0.09 R)
• M91: 46,872,603 km (0.069 R)

Planet 10 - Ice Giant

Semi-Major Axis: 10.87 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 168.4

Radius: 3.9

Gravity: 11.07 G

Time & Orbit

Eccentricity (e): 0.009

Orbit Range: 10.77 AU - 10.97 AU

Year: 15758 Days

Day: 23.3 Hours

Environment

Temp: -204 °C

Axial Tilt: 26.4 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (64)

Outer Limit: 40,662,178 km

• M1: 146,606 km (0.053 R)
• M2: 436,227 km (0.089 R)
• M3: 544,087 km (0.116 R)
• M4: 660,325 km (0.069 R)
• M5: 800,648 km (0.117 R)
• M6: 1,145,022 km (0.038 R)
• M7: 1,800,410 km (0.105 R)
• M8: 3,227,873 km (0.097 R)
• M9: 3,438,657 km (0.059 R)
• M10: 3,518,841 km (0.104 R)
• M11: 4,154,034 km (0.065 R)
• M12: 4,586,970 km (0.103 R)
• M13: 4,973,680 km (0.082 R)
• M14: 5,495,029 km (0.115 R)
• M15: 6,755,391 km (0.077 R)
• M16: 7,262,977 km (0.082 R)
• M17: 7,538,685 km (0.113 R)
• M18: 7,747,674 km (0.114 R)
• M19: 9,041,247 km (0.071 R)
• M20: 9,864,184 km (0.075 R)
• M21: 10,671,714 km (0.105 R)
• M22: 10,710,759 km (0.089 R)
• M23: 10,828,043 km (0.077 R)
• M24: 11,221,785 km (0.118 R)
• M25: 11,580,371 km (0.079 R)
• M26: 12,145,402 km (0.078 R)
• M27: 12,472,274 km (0.107 R)
• M28: 13,851,267 km (0.106 R)
• M29: 14,927,624 km (0.083 R)
• M30: 15,453,759 km (0.071 R)
• M31: 15,586,303 km (0.1 R)
• M32: 16,389,045 km (0.077 R)
• M33: 16,840,831 km (0.099 R)
• M34: 17,159,624 km (0.057 R)
• M35: 17,572,215 km (0.102 R)
• M36: 18,641,540 km (0.073 R)
• M37: 19,397,907 km (0.104 R)
• M38: 19,971,615 km (0.083 R)
• M39: 20,940,261 km (0.038 R)
• M40: 21,381,126 km (0.053 R)
• M41: 23,326,497 km (0.119 R)
• M42: 23,936,407 km (0.099 R)
• M43: 23,987,420 km (0.039 R)
• M44: 24,294,545 km (0.108 R)
• M45: 24,397,318 km (0.039 R)
• M46: 24,448,630 km (0.036 R)
• M47: 24,757,700 km (0.038 R)
• M48: 25,849,614 km (0.117 R)
• M49: 26,217,176 km (0.102 R)
• M50: 28,837,234 km (0.098 R)
• M51: 31,092,721 km (0.065 R)
• M52: 31,819,766 km (0.096 R)
• M53: 32,439,101 km (0.069 R)
• M54: 32,495,649 km (0.071 R)
• M55: 32,665,443 km (0.116 R)
• M56: 33,290,313 km (0.035 R)
• M57: 35,014,429 km (0.115 R)
• M58: 35,130,367 km (0.095 R)
• M59: 35,246,455 km (0.07 R)
• M60: 36,238,588 km (0.11 R)
• M61: 37,239,697 km (0.095 R)
• M62: 39,570,582 km (0.038 R)
• M63: 39,751,745 km (0.118 R)
• M64: 40,540,425 km (0.074 R)

Kuiper Belt

Range: 30 - 60 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 166 - 20,002 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit