🌌 Stone's Star System Generator

Planet 1 - Terrestrial

Semi-Major Axis: 0.55 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 0.26

Radius: 0.58

Gravity: 0.77 G

Time & Orbit

Eccentricity (e): 0.193

Orbit Range: 0.44 AU - 0.66 AU

Year: 268 Days

Day: 39.4 Hours

Environment

Temp: -128 °C

Axial Tilt: 33.5 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Satellites (1)

Outer Limit: 17,993,526 km

• M1: 166,951 km (0.095 R)

Asteroid Belt

Center: 1.09 AU

Composition

Type: Far Outer (Icy/Cometary)

A dense region of planetesimals and debris.

Boundary

Planet 2 - Gas Giant

Semi-Major Axis: 1.62 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 176

Radius: 14.6

Gravity: 0.83 G

Time & Orbit

Eccentricity (e): 0.083

Orbit Range: 1.49 AU - 1.75 AU

Year: 1353 Days

Day: 11.2 Hours

Environment

Temp: -185 °C

Axial Tilt: 37.1 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (38)

Outer Limit: 17,993,526 km

• M1: 184,305 km (0.095 R)
• M2: 330,013 km (0.098 R)
• M3: 619,335 km (0.118 R)
• M4: 862,581 km (0.09 R)
• M5: 1,087,128 km (0.089 R)
• M6: 1,204,113 km (0.046 R)
• M7: 1,331,870 km (0.104 R)
• M8: 1,445,415 km (0.096 R)
• M9: 1,737,430 km (0.109 R)
• M10: 1,955,095 km (0.07 R)
• M11: 2,129,825 km (0.08 R)
• M12: 2,279,722 km (0.112 R)
• M13: 2,694,258 km (0.075 R)
• M14: 2,881,704 km (0.05 R)
• M15: 2,981,336 km (0.066 R)
• M16: 3,201,095 km (0.06 R)
• M17: 3,435,216 km (0.07 R)
• M18: 3,576,735 km (0.06 R)
• M19: 3,729,176 km (0.094 R)
• M20: 3,838,083 km (0.098 R)
• M21: 4,087,313 km (0.08 R)
• M22: 4,284,782 km (0.115 R)
• M23: 4,399,225 km (0.054 R)
• M24: 4,495,266 km (0.073 R)
• M25: 4,837,098 km (0.069 R)
• M26: 4,956,327 km (0.084 R)
• M27: 5,066,431 km (0.086 R)
• M28: 5,248,492 km (0.06 R)
• M29: 5,786,595 km (0.116 R)
• M30: 5,881,590 km (0.098 R)
• M31: 5,998,426 km (0.035 R)
• M32: 6,848,890 km (0.091 R)
• M33: 7,039,328 km (0.091 R)
• M34: 7,368,294 km (0.113 R)
• M35: 7,494,405 km (0.065 R)
• M36: 7,737,202 km (0.109 R)
• M37: 7,830,401 km (0.114 R)
• M38: 8,006,029 km (0.109 R)

Planet 3 - Gas Giant

Semi-Major Axis: 1.98 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 408.2

Radius: 11

Gravity: 3.37 G

Time & Orbit

Eccentricity (e): 0.091

Orbit Range: 1.8 AU - 2.16 AU

Year: 1828 Days

Day: 9.5 Hours

Environment

Temp: -183 °C

Axial Tilt: 34.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (54)

Outer Limit: 17,993,526 km

• M1: 137,929 km (0.113 R)
• M2: 228,286 km (0.085 R)
• M3: 302,636 km (0.108 R)
• M4: 519,105 km (0.114 R)
• M5: 599,439 km (0.089 R)
• M6: 974,929 km (0.073 R)
• M7: 1,045,689 km (0.062 R)
• M8: 1,167,911 km (0.076 R)
• M9: 1,260,661 km (0.117 R)
• M10: 1,481,318 km (0.102 R)
• M11: 1,733,839 km (0.073 R)
• M12: 1,811,481 km (0.106 R)
• M13: 2,051,436 km (0.091 R)
• M14: 2,144,186 km (0.105 R)
• M15: 2,323,255 km (0.054 R)
• M16: 2,496,340 km (0.054 R)
• M17: 2,595,673 km (0.049 R)
• M18: 2,764,269 km (0.111 R)
• M19: 3,147,838 km (0.078 R)
• M20: 3,315,687 km (0.109 R)
• M21: 3,474,411 km (0.11 R)
• M22: 3,573,295 km (0.048 R)
• M23: 3,685,643 km (0.059 R)
• M24: 4,068,912 km (0.107 R)
• M25: 4,424,806 km (0.078 R)
• M26: 5,166,811 km (0.047 R)
• M27: 5,265,845 km (0.081 R)
• M28: 5,394,050 km (0.076 R)
• M29: 5,523,453 km (0.109 R)
• M30: 5,682,924 km (0.116 R)
• M31: 5,770,588 km (0.093 R)
• M32: 6,051,084 km (0.12 R)
• M33: 6,795,334 km (0.116 R)
• M34: 6,950,766 km (0.081 R)
• M35: 7,075,979 km (0.111 R)
• M36: 7,186,083 km (0.12 R)
• M37: 7,424,094 km (0.111 R)
• M38: 8,071,703 km (0.116 R)
• M39: 8,586,020 km (0.119 R)
• M40: 8,923,513 km (0.064 R)
• M41: 9,803,896 km (0.073 R)
• M42: 9,926,866 km (0.093 R)
• M43: 10,050,284 km (0.101 R)
• M44: 10,495,637 km (0.094 R)
• M45: 10,693,705 km (0.066 R)
• M46: 10,820,264 km (0.095 R)
• M47: 10,965,674 km (0.078 R)
• M48: 11,056,779 km (0.1 R)
• M49: 11,295,088 km (0.072 R)
• M50: 11,572,143 km (0.088 R)
• M51: 11,795,343 km (0.063 R)
• M52: 12,227,232 km (0.051 R)
• M53: 12,607,061 km (0.112 R)
• M54: 12,683,506 km (0.106 R)

Planet 4 - Gas Giant

Semi-Major Axis: 2.14 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 616.8

Radius: 11.8

Gravity: 4.43 G

Time & Orbit

Eccentricity (e): 0.217

Orbit Range: 1.68 AU - 2.6 AU

Year: 2054 Days

Day: 13.2 Hours

Environment

Temp: -188 °C

Axial Tilt: 37.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (51)

Outer Limit: 17,993,526 km

• M1: 162,762 km (0.117 R)
• M2: 284,236 km (0.082 R)
• M3: 381,325 km (0.099 R)
• M4: 514,766 km (0.114 R)
• M5: 869,313 km (0.04 R)
• M6: 947,403 km (0.066 R)
• M7: 1,275,621 km (0.08 R)
• M8: 1,479,373 km (0.071 R)
• M9: 2,047,396 km (0.043 R)
• M10: 2,512,197 km (0.076 R)
• M11: 2,796,283 km (0.069 R)
• M12: 2,875,720 km (0.089 R)
• M13: 3,077,378 km (0.041 R)
• M14: 3,228,472 km (0.078 R)
• M15: 3,424,146 km (0.1 R)
• M16: 3,609,497 km (0.106 R)
• M17: 3,710,775 km (0.11 R)
• M18: 3,901,213 km (0.117 R)
• M19: 3,975,414 km (0.06 R)
• M20: 4,292,113 km (0.107 R)
• M21: 4,632,597 km (0.102 R)
• M22: 4,711,286 km (0.083 R)
• M23: 4,838,145 km (0.077 R)
• M24: 5,111,310 km (0.087 R)
• M25: 5,225,304 km (0.099 R)
• M26: 5,978,380 km (0.054 R)
• M27: 6,116,010 km (0.097 R)
• M28: 6,499,429 km (0.092 R)
• M29: 6,712,008 km (0.094 R)
• M30: 6,944,932 km (0.089 R)
• M31: 7,363,357 km (0.115 R)
• M32: 7,455,509 km (0.106 R)
• M33: 8,187,043 km (0.082 R)
• M34: 8,823,881 km (0.107 R)
• M35: 9,079,095 km (0.051 R)
• M36: 9,237,519 km (0.106 R)
• M37: 10,247,753 km (0.107 R)
• M38: 10,350,677 km (0.114 R)
• M39: 10,536,926 km (0.084 R)
• M40: 11,060,070 km (0.077 R)
• M41: 11,591,741 km (0.107 R)
• M42: 12,044,723 km (0.072 R)
• M43: 12,349,903 km (0.098 R)
• M44: 12,812,609 km (0.114 R)
• M45: 13,505,995 km (0.04 R)
• M46: 14,142,833 km (0.09 R)
• M47: 14,280,613 km (0.077 R)
• M48: 14,395,803 km (0.094 R)
• M49: 14,719,682 km (0.063 R)
• M50: 15,116,416 km (0.107 R)
• M51: 15,469,317 km (0.102 R)

Planet 5 - Gas Giant

Semi-Major Axis: 2.27 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 970.1

Radius: 10.5

Gravity: 8.8 G

Time & Orbit

Eccentricity (e): 0.164

Orbit Range: 1.9 AU - 2.64 AU

Year: 2244 Days

Day: 9.6 Hours

Environment

Temp: -195 °C

Axial Tilt: 46.7 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (73)

Outer Limit: 17,993,526 km

• M1: 137,630 km (0.109 R)
• M2: 213,327 km (0.106 R)
• M3: 294,558 km (0.088 R)
• M4: 371,452 km (0.094 R)
• M5: 442,810 km (0.116 R)
• M6: 528,080 km (0.078 R)
• M7: 654,790 km (0.098 R)
• M8: 745,596 km (0.061 R)
• M9: 860,786 km (0.088 R)
• M10: 930,948 km (0.078 R)
• M11: 1,034,768 km (0.109 R)
• M12: 1,243,458 km (0.054 R)
• M13: 1,323,792 km (0.087 R)
• M14: 1,465,910 km (0.108 R)
• M15: 1,650,962 km (0.054 R)
• M16: 1,727,257 km (0.104 R)
• M17: 2,085,245 km (0.115 R)
• M18: 2,481,081 km (0.119 R)
• M19: 2,554,384 km (0.043 R)
• M20: 2,658,055 km (0.114 R)
• M21: 3,588,105 km (0.097 R)
• M22: 3,738,301 km (0.062 R)
• M23: 4,131,594 km (0.096 R)
• M24: 4,236,462 km (0.053 R)
• M25: 4,646,510 km (0.111 R)
• M26: 4,773,967 km (0.029 R)
• M27: 5,050,873 km (0.107 R)
• M28: 5,144,372 km (0.098 R)
• M29: 5,390,161 km (0.098 R)
• M30: 5,524,051 km (0.115 R)
• M31: 5,854,064 km (0.086 R)
• M32: 6,051,084 km (0.12 R)
• M33: 6,330,832 km (0.078 R)
• M34: 6,696,599 km (0.079 R)
• M35: 6,882,250 km (0.041 R)
• M36: 6,965,277 km (0.102 R)
• M37: 7,048,603 km (0.066 R)
• M38: 7,300,675 km (0.032 R)
• M39: 7,385,348 km (0.1 R)
• M40: 7,987,330 km (0.052 R)
• M41: 8,250,173 km (0.097 R)
• M42: 8,560,439 km (0.104 R)
• M43: 8,829,416 km (0.099 R)
• M44: 8,987,690 km (0.097 R)
• M45: 9,537,313 km (0.09 R)
• M46: 9,956,785 km (0.105 R)
• M47: 10,525,407 km (0.108 R)
• M48: 10,813,682 km (0.115 R)
• M49: 11,080,265 km (0.104 R)
• M50: 11,496,447 km (0.112 R)
• M51: 11,570,498 km (0.096 R)
• M52: 11,694,215 km (0.097 R)
• M53: 12,470,778 km (0.082 R)
• M54: 12,826,970 km (0.107 R)
• M55: 12,929,295 km (0.111 R)
• M56: 13,575,408 km (0.039 R)
• M57: 13,705,858 km (0.079 R)
• M58: 14,020,761 km (0.062 R)
• M59: 14,577,565 km (0.097 R)
• M60: 14,764,861 km (0.091 R)
• M61: 14,845,345 km (0.065 R)
• M62: 14,952,906 km (0.087 R)
• M63: 15,168,775 km (0.055 R)
• M64: 15,794,992 km (0.087 R)
• M65: 16,125,154 km (0.116 R)
• M66: 16,680,611 km (0.056 R)
• M67: 17,185,803 km (0.103 R)
• M68: 17,838,499 km (0.06 R)
• M69: 18,067,533 km (0.081 R)
• M70: 18,412,805 km (0.12 R)
• M71: 18,557,317 km (0.108 R)
• M72: 18,905,730 km (0.08 R)
• M73: 19,168,574 km (0.076 R)

Planet 6 - Gas Giant

Semi-Major Axis: 2.45 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 130.7

Radius: 10.5

Gravity: 1.19 G

Time & Orbit

Eccentricity (e): 0.219

Orbit Range: 1.91 AU - 2.99 AU

Year: 2516 Days

Day: 7.6 Hours

Environment

Temp: -201 °C

Axial Tilt: 26.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (62)

Outer Limit: 17,993,526 km

• M1: 143,165 km (0.074 R)
• M2: 294,259 km (0.114 R)
• M3: 367,263 km (0.113 R)
• M4: 500,255 km (0.064 R)
• M5: 605,123 km (0.103 R)
• M6: 718,219 km (0.081 R)
• M7: 832,512 km (0.074 R)
• M8: 919,279 km (0.088 R)
• M9: 1,009,337 km (0.092 R)
• M10: 1,109,717 km (0.106 R)
• M11: 1,198,728 km (0.119 R)
• M12: 1,267,244 km (0.109 R)
• M13: 1,448,257 km (0.071 R)
• M14: 1,554,621 km (0.101 R)
• M15: 1,655,001 km (0.085 R)
• M16: 1,916,050 km (0.111 R)
• M17: 2,006,107 km (0.091 R)
• M18: 2,134,612 km (0.109 R)
• M19: 2,342,104 km (0.065 R)
• M20: 2,477,640 km (0.119 R)
• M21: 2,586,098 km (0.108 R)
• M22: 2,665,984 km (0.069 R)
• M23: 2,838,470 km (0.115 R)
• M24: 3,215,905 km (0.111 R)
• M25: 3,312,845 km (0.082 R)
• M26: 3,432,673 km (0.098 R)
• M27: 3,620,717 km (0.088 R)
• M28: 3,687,887 km (0.106 R)
• M29: 3,800,833 km (0.059 R)
• M30: 3,891,938 km (0.115 R)
• M31: 4,076,542 km (0.085 R)
• M32: 4,181,709 km (0.094 R)
• M33: 4,394,737 km (0.111 R)
• M34: 4,514,565 km (0.113 R)
• M35: 4,611,205 km (0.087 R)
• M36: 4,980,113 km (0.095 R)
• M37: 5,092,611 km (0.099 R)
• M38: 5,193,440 km (0.101 R)
• M39: 5,512,532 km (0.111 R)
• M40: 5,616,054 km (0.029 R)
• M41: 5,930,508 km (0.102 R)
• M42: 6,318,116 km (0.096 R)
• M43: 6,385,735 km (0.083 R)
• M44: 6,521,869 km (0.061 R)
• M45: 6,755,391 km (0.069 R)
• M46: 6,963,781 km (0.096 R)
• M47: 7,033,643 km (0.085 R)
• M48: 7,160,203 km (0.051 R)
• M49: 7,344,208 km (0.076 R)
• M50: 7,458,351 km (0.104 R)
• M51: 8,022,784 km (0.072 R)
• M52: 8,228,780 km (0.104 R)
• M53: 8,811,913 km (0.05 R)
• M54: 9,024,492 km (0.114 R)
• M55: 9,161,972 km (0.111 R)
• M56: 9,254,124 km (0.07 R)
• M57: 9,516,818 km (0.065 R)
• M58: 9,829,029 km (0.049 R)
• M59: 10,192,103 km (0.108 R)
• M60: 10,319,560 km (0.051 R)
• M61: 10,818,020 km (0.097 R)
• M62: 10,899,252 km (0.116 R)

Planet 7 - Gas Giant

Semi-Major Axis: 5.02 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 258.8

Radius: 13.1

Gravity: 1.51 G

Time & Orbit

Eccentricity (e): 0.039

Orbit Range: 4.82 AU - 5.22 AU

Year: 7378 Days

Day: 14 Hours

Environment

Temp: -215 °C

Axial Tilt: 42.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (76)

Outer Limit: 17,993,526 km

• M1: 183,108 km (0.06 R)
• M2: 294,708 km (0.092 R)
• M3: 405,111 km (0.036 R)
• M4: 535,710 km (0.083 R)
• M5: 1,079,349 km (0.072 R)
• M6: 1,189,303 km (0.107 R)
• M7: 1,421,180 km (0.08 R)
• M8: 1,668,166 km (0.058 R)
• M9: 1,946,418 km (0.067 R)
• M10: 2,204,773 km (0.039 R)
• M11: 2,383,244 km (0.101 R)
• M12: 2,492,749 km (0.041 R)
• M13: 2,967,423 km (0.115 R)
• M14: 3,388,093 km (0.047 R)
• M15: 4,087,762 km (0.035 R)
• M16: 4,241,997 km (0.113 R)
• M17: 4,353,298 km (0.108 R)
• M18: 4,443,057 km (0.115 R)
• M19: 4,693,184 km (0.087 R)
• M20: 5,255,224 km (0.094 R)
• M21: 5,666,468 km (0.033 R)
• M22: 5,888,322 km (0.064 R)
• M23: 6,315,424 km (0.066 R)
• M24: 6,468,612 km (0.112 R)
• M25: 6,648,877 km (0.073 R)
• M26: 6,830,788 km (0.097 R)
• M27: 7,333,138 km (0.089 R)
• M28: 7,440,400 km (0.117 R)
• M29: 7,792,703 km (0.03 R)
• M30: 8,206,042 km (0.059 R)
• M31: 8,570,163 km (0.115 R)
• M32: 8,910,947 km (0.092 R)
• M33: 8,996,966 km (0.063 R)
• M34: 9,111,857 km (0.045 R)
• M35: 9,488,993 km (0.113 R)
• M36: 9,694,092 km (0.117 R)
• M37: 9,900,836 km (0.054 R)
• M38: 10,019,467 km (0.115 R)
• M39: 10,650,770 km (0.035 R)
• M40: 11,388,138 km (0.096 R)
• M41: 11,668,784 km (0.082 R)
• M42: 12,524,783 km (0.069 R)
• M43: 12,879,329 km (0.078 R)
• M44: 13,830,024 km (0.107 R)
• M45: 14,397,748 km (0.116 R)
• M46: 14,600,004 km (0.101 R)
• M47: 14,871,076 km (0.075 R)
• M48: 15,041,468 km (0.087 R)
• M49: 15,280,974 km (0.091 R)
• M50: 15,418,454 km (0.084 R)
• M51: 15,972,265 km (0.111 R)
• M52: 16,392,037 km (0.105 R)
• M53: 16,673,879 km (0.069 R)
• M54: 16,957,218 km (0.09 R)
• M55: 17,170,844 km (0.094 R)
• M56: 17,600,788 km (0.069 R)
• M57: 18,544,601 km (0.082 R)
• M58: 18,691,356 km (0.09 R)
• M59: 18,948,814 km (0.073 R)
• M60: 19,393,270 km (0.112 R)
• M61: 19,616,619 km (0.089 R)
• M62: 20,254,505 km (0.106 R)
• M63: 20,443,297 km (0.107 R)
• M64: 20,860,974 km (0.069 R)
• M65: 20,975,417 km (0.091 R)
• M66: 21,319,791 km (0.052 R)
• M67: 22,247,447 km (0.115 R)
• M68: 22,833,871 km (0.083 R)
• M69: 26,211,193 km (0.082 R)
• M70: 26,293,471 km (0.059 R)
• M71: 26,582,195 km (0.111 R)
• M72: 27,580,163 km (0.066 R)
• M73: 27,663,937 km (0.101 R)
• M74: 27,789,600 km (0.057 R)
• M75: 28,041,672 km (0.092 R)
• M76: 28,125,896 km (0.096 R)

Planet 8 - Ice Giant

Semi-Major Axis: 6.93 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 25.3

Radius: 4.9

Gravity: 1.05 G

Time & Orbit

Eccentricity (e): 0.231

Orbit Range: 5.33 AU - 8.53 AU

Year: 11968 Days

Day: 24.5 Hours

Environment

Temp: -224 °C

Axial Tilt: 7.1 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (55)

Outer Limit: 17,993,526 km

• M1: 140,472 km (0.102 R)
• M2: 209,886 km (0.107 R)
• M3: 286,031 km (0.11 R)
• M4: 371,900 km (0.062 R)
• M5: 602,730 km (0.077 R)
• M6: 653,743 km (0.075 R)
• M7: 724,054 km (0.118 R)
• M8: 797,057 km (0.118 R)
• M9: 1,499,419 km (0.115 R)
• M10: 1,886,280 km (0.096 R)
• M11: 1,962,126 km (0.111 R)
• M12: 2,116,810 km (0.097 R)
• M13: 2,861,508 km (0.081 R)
• M14: 2,919,552 km (0.088 R)
• M15: 3,352,787 km (0.113 R)
• M16: 3,383,455 km (0.119 R)
• M17: 3,631,788 km (0.119 R)
• M18: 3,774,055 km (0.061 R)
• M19: 3,837,933 km (0.088 R)
• M20: 4,031,663 km (0.071 R)
• M21: 4,179,017 km (0.108 R)
• M22: 4,428,546 km (0.11 R)
• M23: 4,546,578 km (0.07 R)
• M24: 4,976,972 km (0.094 R)
• M25: 5,046,983 km (0.081 R)
• M26: 5,152,749 km (0.12 R)
• M27: 5,546,640 km (0.042 R)
• M28: 5,894,455 km (0.078 R)
• M29: 6,005,906 km (0.038 R)
• M30: 6,136,654 km (0.087 R)
• M31: 7,839,078 km (0.119 R)
• M32: 8,646,458 km (0.036 R)
• M33: 9,263,998 km (0.053 R)
• M34: 9,307,082 km (0.108 R)
• M35: 9,501,858 km (0.106 R)
• M36: 9,654,299 km (0.069 R)
• M37: 9,697,981 km (0.108 R)
• M38: 9,785,646 km (0.101 R)
• M39: 9,829,478 km (0.1 R)
• M40: 10,138,696 km (0.119 R)
• M41: 10,451,057 km (0.06 R)
• M42: 10,518,376 km (0.088 R)
• M43: 11,245,721 km (0.045 R)
• M44: 11,918,762 km (0.063 R)
• M45: 12,130,293 km (0.069 R)
• M46: 13,498,665 km (0.085 R)
• M47: 13,571,968 km (0.085 R)
• M48: 15,066,899 km (0.094 R)
• M49: 15,346,498 km (0.11 R)
• M50: 16,092,093 km (0.117 R)
• M51: 16,404,005 km (0.112 R)
• M52: 16,560,783 km (0.114 R)
• M53: 17,219,164 km (0.104 R)
• M54: 17,458,221 km (0.115 R)
• M55: 17,671,697 km (0.083 R)

Kuiper Belt

Range: 30 - 55 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 348 - 14,096 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit