🌌 Stone's Star System Generator

Planet 1 - Terrestrial

Semi-Major Axis: 0.53 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 3.09

Radius: 1.57

Gravity: 1.25 G

Time & Orbit

Eccentricity (e): 0.078

Orbit Range: 0.49 AU - 0.57 AU

Year: 249 Days

Day: 28.6 Hours

Environment

Temp: -119 °C

Axial Tilt: 48.4 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Asteroid Belt

Center: 0.87 AU

Composition

Type: Main (Rocky/Icy Mix)

A dense region of planetesimals and debris.

Boundary

Planet 2 - Gas Giant

Semi-Major Axis: 1.2 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 718.8

Radius: 8.6

Gravity: 9.72 G

Time & Orbit

Eccentricity (e): 0.047

Orbit Range: 1.14 AU - 1.26 AU

Year: 849 Days

Day: 14.4 Hours

Environment

Temp: -170 °C

Axial Tilt: 28.3 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (59)

Outer Limit: 45,422,082 km

• M1: 109,356 km (0.084 R)
• M2: 173,085 km (0.119 R)
• M3: 247,136 km (0.119 R)
• M4: 321,336 km (0.094 R)
• M5: 375,042 km (0.107 R)
• M6: 441,613 km (0.095 R)
• M7: 508,184 km (0.053 R)
• M8: 609,911 km (0.072 R)
• M9: 685,457 km (0.091 R)
• M10: 770,429 km (0.091 R)
• M11: 847,023 km (0.11 R)
• M12: 926,310 km (0.12 R)
• M13: 1,047,035 km (0.114 R)
• M14: 1,166,415 km (0.086 R)
• M15: 1,390,063 km (0.082 R)
• M16: 1,499,719 km (0.085 R)
• M17: 1,642,734 km (0.112 R)
• M18: 1,719,927 km (0.108 R)
• M19: 1,790,537 km (0.05 R)
• M20: 1,894,059 km (0.089 R)
• M21: 2,040,964 km (0.092 R)
• M22: 2,099,157 km (0.1 R)
• M23: 2,174,704 km (0.091 R)
• M24: 2,302,760 km (0.108 R)
• M25: 2,372,024 km (0.085 R)
• M26: 2,886,341 km (0.105 R)
• M27: 2,970,715 km (0.067 R)
• M28: 3,027,412 km (0.104 R)
• M29: 3,444,491 km (0.105 R)
• M30: 3,644,803 km (0.068 R)
• M31: 3,705,539 km (0.071 R)
• M32: 3,818,037 km (0.085 R)
• M33: 4,056,645 km (0.09 R)
• M34: 4,225,691 km (0.099 R)
• M35: 4,526,981 km (0.108 R)
• M36: 4,680,319 km (0.098 R)
• M37: 4,868,663 km (0.117 R)
• M38: 4,924,612 km (0.113 R)
• M39: 5,116,397 km (0.073 R)
• M40: 5,425,915 km (0.095 R)
• M41: 5,495,478 km (0.062 R)
• M42: 5,588,827 km (0.109 R)
• M43: 5,765,203 km (0.1 R)
• M44: 6,087,437 km (0.064 R)
• M45: 6,256,781 km (0.109 R)
• M46: 6,687,025 km (0.11 R)
• M47: 6,761,674 km (0.103 R)
• M48: 6,849,189 km (0.12 R)
• M49: 7,050,697 km (0.117 R)
• M50: 7,241,435 km (0.077 R)
• M51: 7,472,563 km (0.077 R)
• M52: 7,902,508 km (0.118 R)
• M53: 8,421,163 km (0.038 R)
• M54: 8,475,019 km (0.077 R)
• M55: 8,582,879 km (0.117 R)
• M56: 8,637,033 km (0.103 R)
• M57: 8,813,858 km (0.069 R)
• M58: 9,171,097 km (0.037 R)
• M59: 9,323,687 km (0.101 R)

Planet 3 - Gas Giant

Semi-Major Axis: 2.3 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 243.3

Radius: 10.2

Gravity: 2.34 G

Time & Orbit

Eccentricity (e): 0.101

Orbit Range: 2.07 AU - 2.53 AU

Year: 2252 Days

Day: 14 Hours

Environment

Temp: -202 °C

Axial Tilt: 19 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (72)

Outer Limit: 45,422,082 km

• M1: 132,693 km (0.114 R)
• M2: 201,359 km (0.044 R)
• M3: 274,362 km (0.052 R)
• M4: 342,579 km (0.051 R)
• M5: 473,926 km (0.109 R)
• M6: 550,071 km (0.12 R)
• M7: 618,288 km (0.077 R)
• M8: 878,588 km (0.087 R)
• M9: 1,029,682 km (0.065 R)
• M10: 1,239,418 km (0.071 R)
• M11: 1,323,941 km (0.042 R)
• M12: 1,463,217 km (0.081 R)
• M13: 1,728,603 km (0.07 R)
• M14: 1,814,173 km (0.112 R)
• M15: 2,069,387 km (0.108 R)
• M16: 2,170,815 km (0.103 R)
• M17: 2,273,888 km (0.066 R)
• M18: 2,571,139 km (0.113 R)
• M19: 2,636,513 km (0.108 R)
• M20: 2,746,767 km (0.109 R)
• M21: 2,813,637 km (0.051 R)
• M22: 2,926,434 km (0.116 R)
• M23: 3,029,207 km (0.034 R)
• M24: 3,098,322 km (0.087 R)
• M25: 3,226,527 km (0.118 R)
• M26: 3,404,399 km (0.033 R)
• M27: 3,500,590 km (0.117 R)
• M28: 3,585,412 km (0.045 R)
• M29: 3,720,200 km (0.104 R)
• M30: 3,869,199 km (0.07 R)
• M31: 3,995,011 km (0.112 R)
• M32: 4,173,332 km (0.043 R)
• M33: 4,537,902 km (0.117 R)
• M34: 4,643,967 km (0.069 R)
• M35: 4,885,717 km (0.119 R)
• M36: 5,353,509 km (0.081 R)
• M37: 5,721,071 km (0.087 R)
• M38: 5,807,090 km (0.116 R)
• M39: 6,450,810 km (0.06 R)
• M40: 6,600,408 km (0.108 R)
• M41: 6,735,943 km (0.12 R)
• M42: 6,857,118 km (0.045 R)
• M43: 6,933,263 km (0.079 R)
• M44: 7,194,461 km (0.073 R)
• M45: 7,271,803 km (0.102 R)
• M46: 7,396,268 km (0.106 R)
• M47: 7,600,021 km (0.088 R)
• M48: 7,742,139 km (0.025 R)
• M49: 7,885,154 km (0.077 R)
• M50: 7,965,039 km (0.062 R)
• M51: 8,238,504 km (0.098 R)
• M52: 8,466,043 km (0.071 R)
• M53: 8,629,852 km (0.103 R)
• M54: 8,761,798 km (0.115 R)
• M55: 9,094,204 km (0.112 R)
• M56: 9,262,053 km (0.107 R)
• M57: 9,346,426 km (0.083 R)
• M58: 9,481,812 km (0.117 R)
• M59: 10,203,472 km (0.082 R)
• M60: 10,325,395 km (0.091 R)
• M61: 10,412,909 km (0.084 R)
• M62: 10,482,921 km (0.05 R)
• M63: 10,588,537 km (0.104 R)
• M64: 10,996,191 km (0.091 R)
• M65: 11,085,501 km (0.093 R)
• M66: 11,336,826 km (0.033 R)
• M67: 11,608,196 km (0.056 R)
• M68: 11,808,658 km (0.101 R)
• M69: 12,102,169 km (0.094 R)
• M70: 12,249,971 km (0.115 R)
• M71: 12,491,273 km (0.052 R)
• M72: 12,565,772 km (0.116 R)

Planet 4 - Gas Giant

Semi-Major Axis: 2.54 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 592.5

Radius: 10.9

Gravity: 4.99 G

Time & Orbit

Eccentricity (e): 0.051

Orbit Range: 2.41 AU - 2.67 AU

Year: 2614 Days

Day: 14.5 Hours

Environment

Temp: -205 °C

Axial Tilt: 9.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (69)

Outer Limit: 45,422,082 km

• M1: 184,155 km (0.094 R)
• M2: 289,472 km (0.085 R)
• M3: 457,021 km (0.073 R)
• M4: 678,277 km (0.093 R)
• M5: 757,115 km (0.109 R)
• M6: 915,689 km (0.115 R)
• M7: 1,044,642 km (0.099 R)
• M8: 1,169,556 km (0.078 R)
• M9: 1,255,725 km (0.117 R)
• M10: 1,893,759 km (0.069 R)
• M11: 2,074,174 km (0.111 R)
• M12: 2,342,104 km (0.114 R)
• M13: 2,438,445 km (0.087 R)
• M14: 2,564,407 km (0.095 R)
• M15: 2,823,061 km (0.056 R)
• M16: 3,553,697 km (0.072 R)
• M17: 3,858,727 km (0.089 R)
• M18: 4,105,714 km (0.083 R)
• M19: 4,306,923 km (0.103 R)
• M20: 4,442,907 km (0.066 R)
• M21: 4,649,651 km (0.092 R)
• M22: 4,771,723 km (0.096 R)
• M23: 4,877,339 km (0.108 R)
• M24: 4,948,099 km (0.068 R)
• M25: 5,288,883 km (0.091 R)
• M26: 5,861,544 km (0.072 R)
• M27: 6,031,487 km (0.12 R)
• M28: 6,126,631 km (0.109 R)
• M29: 6,203,225 km (0.093 R)
• M30: 6,866,243 km (0.095 R)
• M31: 7,025,415 km (0.107 R)
• M32: 7,125,646 km (0.055 R)
• M33: 7,286,912 km (0.052 R)
• M34: 7,388,340 km (0.099 R)
• M35: 7,572,195 km (0.083 R)
• M36: 7,674,969 km (0.117 R)
• M37: 7,840,424 km (0.105 R)
• M38: 7,965,189 km (0.046 R)
• M39: 8,090,702 km (0.099 R)
• M40: 8,556,549 km (0.069 R)
• M41: 9,009,233 km (0.077 R)
• M42: 9,381,582 km (0.056 R)
• M43: 9,514,125 km (0.104 R)
• M44: 9,691,997 km (0.116 R)
• M45: 9,870,916 km (0.117 R)
• M46: 10,163,979 km (0.115 R)
• M47: 10,574,475 km (0.072 R)
• M48: 10,712,554 km (0.061 R)
• M49: 10,920,794 km (0.074 R)
• M50: 11,482,534 km (0.118 R)
• M51: 12,101,869 km (0.102 R)
• M52: 12,854,347 km (0.044 R)
• M53: 13,051,068 km (0.115 R)
• M54: 13,273,520 km (0.076 R)
• M55: 13,522,152 km (0.081 R)
• M56: 13,822,694 km (0.066 R)
• M57: 14,125,330 km (0.03 R)
• M58: 14,481,223 km (0.082 R)
• M59: 14,711,604 km (0.107 R)
• M60: 14,865,840 km (0.085 R)
• M61: 15,175,956 km (0.085 R)
• M62: 15,383,747 km (0.039 R)
• M63: 15,488,167 km (0.064 R)
• M64: 15,592,736 km (0.048 R)
• M65: 16,092,542 km (0.065 R)
• M66: 17,000,152 km (0.086 R)
• M67: 17,596,300 km (0.09 R)
• M68: 17,924,368 km (0.101 R)
• M69: 18,447,961 km (0.05 R)

Planet 5 - Gas Giant

Semi-Major Axis: 2.7 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 89.2

Radius: 8.1

Gravity: 1.36 G

Time & Orbit

Eccentricity (e): 0.066

Orbit Range: 2.52 AU - 2.88 AU

Year: 2865 Days

Day: 11.6 Hours

Environment

Temp: -207 °C

Axial Tilt: 29.3 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (65)

Outer Limit: 45,422,082 km

• M1: 101,128 km (0.026 R)
• M2: 175,179 km (0.095 R)
• M3: 337,343 km (0.074 R)
• M4: 426,504 km (0.086 R)
• M5: 513,869 km (0.06 R)
• M6: 607,966 km (0.11 R)
• M7: 726,597 km (0.089 R)
• M8: 814,411 km (0.097 R)
• M9: 872,754 km (0.063 R)
• M10: 959,970 km (0.088 R)
• M11: 1,121,386 km (0.042 R)
• M12: 1,276,818 km (0.111 R)
• M13: 1,361,041 km (0.115 R)
• M14: 1,439,281 km (0.087 R)
• M15: 1,617,003 km (0.086 R)
• M16: 1,700,180 km (0.109 R)
• M17: 1,776,176 km (0.107 R)
• M18: 1,923,081 km (0.103 R)
• M19: 2,065,049 km (0.104 R)
• M20: 2,137,305 km (0.111 R)
• M21: 2,192,207 km (0.107 R)
• M22: 2,378,307 km (0.119 R)
• M23: 2,444,579 km (0.066 R)
• M24: 2,569,643 km (0.086 R)
• M25: 2,706,525 km (0.101 R)
• M26: 2,886,192 km (0.061 R)
• M27: 2,977,596 km (0.113 R)
• M28: 3,194,363 km (0.114 R)
• M29: 3,310,152 km (0.097 R)
• M30: 3,384,502 km (0.07 R)
• M31: 3,480,843 km (0.117 R)
• M32: 3,676,517 km (0.098 R)
• M33: 3,954,171 km (0.069 R)
• M34: 4,146,853 km (0.118 R)
• M35: 4,389,351 km (0.084 R)
• M36: 4,459,363 km (0.03 R)
• M37: 4,671,942 km (0.038 R)
• M38: 5,045,936 km (0.099 R)
• M39: 5,205,707 km (0.039 R)
• M40: 5,342,140 km (0.086 R)
• M41: 5,479,770 km (0.115 R)
• M42: 6,133,363 km (0.108 R)
• M43: 6,185,573 km (0.112 R)
• M44: 6,264,411 km (0.043 R)
• M45: 6,542,513 km (0.084 R)
• M46: 6,743,872 km (0.063 R)
• M47: 6,906,186 km (0.097 R)
• M48: 7,111,135 km (0.043 R)
• M49: 7,221,239 km (0.101 R)
• M50: 7,401,355 km (0.065 R)
• M51: 7,597,029 km (0.095 R)
• M52: 8,151,139 km (0.078 R)
• M53: 8,367,757 km (0.063 R)
• M54: 8,425,801 km (0.078 R)
• M55: 8,513,316 km (0.066 R)
• M56: 8,747,735 km (0.106 R)
• M57: 8,836,297 km (0.102 R)
• M58: 8,984,399 km (0.071 R)
• M59: 9,148,209 km (0.096 R)
• M60: 9,223,158 km (0.062 R)
• M61: 9,936,440 km (0.063 R)
• M62: 9,998,074 km (0.05 R)
• M63: 10,198,984 km (0.061 R)
• M64: 10,354,417 km (0.087 R)
• M65: 10,448,065 km (0.103 R)

Planet 6 - Gas Giant

Semi-Major Axis: 4.19 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 146.2

Radius: 10.3

Gravity: 1.38 G

Time & Orbit

Eccentricity (e): 0.059

Orbit Range: 3.94 AU - 4.44 AU

Year: 5538 Days

Day: 7.5 Hours

Environment

Temp: -209 °C

Axial Tilt: 7.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (75)

Outer Limit: 45,422,082 km

• M1: 131,197 km (0.056 R)
• M2: 203,902 km (0.068 R)
• M3: 299,196 km (0.068 R)
• M4: 514,317 km (0.069 R)
• M5: 654,790 km (0.083 R)
• M6: 725,849 km (0.115 R)
• M7: 818,600 km (0.103 R)
• M8: 1,321,847 km (0.105 R)
• M9: 1,655,001 km (0.048 R)
• M10: 1,935,348 km (0.042 R)
• M11: 2,081,206 km (0.089 R)
• M12: 2,342,104 km (0.062 R)
• M13: 2,599,113 km (0.107 R)
• M14: 2,760,679 km (0.085 R)
• M15: 2,865,248 km (0.117 R)
• M16: 2,986,422 km (0.108 R)
• M17: 3,408,139 km (0.068 R)
• M18: 3,782,283 km (0.116 R)
• M19: 4,101,375 km (0.114 R)
• M20: 4,221,203 km (0.048 R)
• M21: 4,290,168 km (0.095 R)
• M22: 4,376,935 km (0.103 R)
• M23: 5,019,009 km (0.103 R)
• M24: 5,128,963 km (0.105 R)
• M25: 5,202,715 km (0.051 R)
• M26: 5,369,816 km (0.097 R)
• M27: 5,463,464 km (0.085 R)
• M28: 6,017,425 km (0.116 R)
• M29: 6,370,476 km (0.085 R)
• M30: 6,669,671 km (0.094 R)
• M31: 6,973,654 km (0.11 R)
• M32: 7,158,109 km (0.108 R)
• M33: 7,742,587 km (0.084 R)
• M34: 7,827,409 km (0.114 R)
• M35: 8,019,194 km (0.044 R)
• M36: 8,780,198 km (0.119 R)
• M37: 8,935,182 km (0.104 R)
• M38: 9,001,753 km (0.109 R)
• M39: 9,518,613 km (0.114 R)
• M40: 9,700,674 km (0.047 R)
• M41: 10,091,424 km (0.053 R)
• M42: 10,277,075 km (0.065 R)
• M43: 10,370,274 km (0.048 R)
• M44: 11,102,556 km (0.059 R)
• M45: 11,246,170 km (0.1 R)
• M46: 11,656,666 km (0.062 R)
• M47: 11,875,827 km (0.107 R)
• M48: 11,973,814 km (0.051 R)
• M49: 12,047,416 km (0.118 R)
• M50: 12,442,504 km (0.092 R)
• M51: 12,541,986 km (0.098 R)
• M52: 12,691,584 km (0.112 R)
• M53: 12,841,930 km (0.107 R)
• M54: 13,144,118 km (0.101 R)
• M55: 13,397,836 km (0.106 R)
• M56: 13,602,037 km (0.103 R)
• M57: 13,910,208 km (0.074 R)
• M58: 14,039,311 km (0.079 R)
• M59: 14,168,714 km (0.094 R)
• M60: 14,298,714 km (0.104 R)
• M61: 14,743,169 km (0.069 R)
• M62: 14,848,486 km (0.103 R)
• M63: 14,927,624 km (0.108 R)
• M64: 15,298,776 km (0.112 R)
• M65: 15,485,324 km (0.096 R)
• M66: 16,131,138 km (0.065 R)
• M67: 16,593,994 km (0.116 R)
• M68: 16,950,785 km (0.038 R)
• M69: 17,061,188 km (0.103 R)
• M70: 17,227,092 km (0.119 R)
• M71: 17,393,595 km (0.059 R)
• M72: 17,756,070 km (0.119 R)
• M73: 18,149,214 km (0.086 R)
• M74: 18,262,010 km (0.112 R)
• M75: 18,801,460 km (0.045 R)

Planet 7 - Ice Giant

Semi-Major Axis: 8.92 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 197

Radius: 6

Gravity: 5.47 G

Time & Orbit

Eccentricity (e): 0.058

Orbit Range: 8.4 AU - 9.44 AU

Year: 17201 Days

Day: 15.8 Hours

Environment

Temp: -218 °C

Axial Tilt: 31.1 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (84)

Outer Limit: 45,422,082 km

• M1: 82,129 km (0.11 R)
• M2: 149,747 km (0.089 R)
• M3: 202,855 km (0.039 R)
• M4: 384,317 km (0.103 R)
• M5: 521,947 km (0.1 R)
• M6: 566,527 km (0.088 R)
• M7: 612,304 km (0.052 R)
• M8: 691,741 km (0.092 R)
• M9: 774,618 km (0.096 R)
• M10: 1,218,325 km (0.116 R)
• M11: 1,487,152 km (0.116 R)
• M12: 1,706,463 km (0.083 R)
• M13: 2,399,400 km (0.099 R)
• M14: 2,630,379 km (0.101 R)
• M15: 2,868,689 km (0.073 R)
• M16: 2,949,621 km (0.098 R)
• M17: 3,800,684 km (0.094 R)
• M18: 3,949,533 km (0.072 R)
• M19: 4,161,065 km (0.082 R)
• M20: 4,563,932 km (0.11 R)
• M21: 5,174,740 km (0.116 R)
• M22: 5,811,279 km (0.085 R)
• M23: 5,982,718 km (0.034 R)
• M24: 6,901,698 km (0.118 R)
• M25: 7,488,720 km (0.116 R)
• M26: 7,638,018 km (0.113 R)
• M27: 7,712,967 km (0.099 R)
• M28: 7,901,610 km (0.101 R)
• M29: 8,015,454 km (0.057 R)
• M30: 8,168,193 km (0.112 R)
• M31: 8,437,769 km (0.117 R)
• M32: 8,906,608 km (0.069 R)
• M33: 9,104,526 km (0.033 R)
• M34: 9,263,848 km (0.098 R)
• M35: 9,424,217 km (0.047 R)
• M36: 9,464,459 km (0.068 R)
• M37: 10,488,157 km (0.09 R)
• M38: 10,571,633 km (0.106 R)
• M39: 10,949,667 km (0.111 R)
• M40: 11,675,964 km (0.077 R)
• M41: 11,805,815 km (0.116 R)
• M42: 11,979,648 km (0.117 R)
• M43: 12,861,228 km (0.084 R)
• M44: 13,672,497 km (0.106 R)
• M45: 14,826,346 km (0.078 R)
• M46: 15,249,409 km (0.117 R)
• M47: 15,724,083 km (0.063 R)
• M48: 15,771,804 km (0.077 R)
• M49: 15,963,290 km (0.088 R)
• M50: 16,445,294 km (0.056 R)
• M51: 17,571,766 km (0.07 R)
• M52: 18,319,755 km (0.113 R)
• M53: 19,898,462 km (0.088 R)
• M54: 20,364,908 km (0.109 R)
• M55: 20,992,321 km (0.084 R)
• M56: 22,159,185 km (0.083 R)
• M57: 23,455,899 km (0.095 R)
• M58: 26,917,893 km (0.098 R)
• M59: 27,491,152 km (0.069 R)
• M60: 30,060,346 km (0.048 R)
• M61: 31,013,583 km (0.106 R)
• M62: 32,400,954 km (0.111 R)
• M63: 32,705,386 km (0.102 R)
• M64: 33,194,122 km (0.102 R)
• M65: 34,055,506 km (0.119 R)
• M66: 34,613,058 km (0.071 R)
• M67: 34,675,141 km (0.083 R)
• M68: 35,737,136 km (0.059 R)
• M69: 35,799,967 km (0.055 R)
• M70: 35,862,798 km (0.069 R)
• M71: 36,936,761 km (0.094 R)
• M72: 38,406,411 km (0.077 R)
• M73: 38,599,542 km (0.112 R)
• M74: 38,728,495 km (0.072 R)
• M75: 39,634,909 km (0.08 R)
• M76: 39,895,209 km (0.071 R)
• M77: 40,351,931 km (0.099 R)
• M78: 41,666,747 km (0.05 R)
• M79: 42,728,593 km (0.114 R)
• M80: 43,396,846 km (0.096 R)
• M81: 44,068,541 km (0.036 R)
• M82: 44,203,179 km (0.044 R)
• M83: 44,811,294 km (0.056 R)
• M84: 45,218,200 km (0.066 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: 516 - 11,053 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit