🌌 Stone's Star System Generator

Asteroid Belt

Center: 0.63 AU

Composition

Type: Main (Rocky/Icy Mix)

A dense region of planetesimals and debris.

Boundary

Planet 1 - Gas Giant

Semi-Major Axis: 1.25 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 436.2

Radius: 13.7

Gravity: 2.32 G

Time & Orbit

Eccentricity (e): 0.192

Orbit Range: 1.01 AU - 1.49 AU

Year: 902 Days

Day: 14.1 Hours

Environment

Temp: -179 °C

Axial Tilt: 47.8 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (36)

Outer Limit: 83,006,960 km

• M1: 212,579 km (0.091 R)
• M2: 340,634 km (0.104 R)
• M3: 442,959 km (0.04 R)
• M4: 680,670 km (0.102 R)
• M5: 832,811 km (0.107 R)
• M6: 963,560 km (0.064 R)
• M7: 1,066,633 km (0.089 R)
• M8: 1,329,476 km (0.088 R)
• M9: 1,641,388 km (0.118 R)
• M10: 2,141,942 km (0.038 R)
• M11: 2,358,560 km (0.11 R)
• M12: 2,623,348 km (0.106 R)
• M13: 2,838,919 km (0.106 R)
• M14: 2,991,808 km (0.058 R)
• M15: 3,121,210 km (0.096 R)
• M16: 3,252,707 km (0.116 R)
• M17: 3,493,858 km (0.052 R)
• M18: 3,806,219 km (0.025 R)
• M19: 4,022,687 km (0.11 R)
• M20: 4,185,449 km (0.056 R)
• M21: 4,272,515 km (0.091 R)
• M22: 4,389,501 km (0.091 R)
• M23: 4,636,786 km (0.103 R)
• M24: 4,747,040 km (0.11 R)
• M25: 4,837,995 km (0.116 R)
• M26: 4,949,894 km (0.088 R)
• M27: 5,228,146 km (0.07 R)
• M28: 5,501,162 km (0.112 R)
• M29: 5,628,769 km (0.039 R)
• M30: 6,403,986 km (0.102 R)
• M31: 6,719,039 km (0.094 R)
• M32: 6,935,656 km (0.056 R)
• M33: 7,329,248 km (0.082 R)
• M34: 7,516,994 km (0.04 R)
• M35: 8,126,306 km (0.077 R)
• M36: 8,247,630 km (0.045 R)

Planet 2 - Gas Giant

Semi-Major Axis: 1.26 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 588.8

Radius: 9.8

Gravity: 6.13 G

Time & Orbit

Eccentricity (e): 0.001

Orbit Range: 1.26 AU - 1.26 AU

Year: 913 Days

Day: 5.2 Hours

Environment

Temp: -164 °C

Axial Tilt: 41.1 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (60)

Outer Limit: 83,006,960 km

• M1: 132,394 km (0.092 R)
• M2: 194,776 km (0.076 R)
• M3: 262,694 km (0.108 R)
• M4: 343,926 km (0.07 R)
• M5: 410,347 km (0.111 R)
• M6: 529,726 km (0.117 R)
• M7: 651,648 km (0.108 R)
• M8: 901,178 km (0.058 R)
• M9: 1,108,221 km (0.095 R)
• M10: 1,180,776 km (0.096 R)
• M11: 1,268,740 km (0.084 R)
• M12: 1,401,433 km (0.056 R)
• M13: 1,502,262 km (0.113 R)
• M14: 1,583,194 km (0.116 R)
• M15: 1,673,252 km (0.083 R)
• M16: 1,835,117 km (0.109 R)
• M17: 1,954,047 km (0.108 R)
• M18: 2,050,987 km (0.103 R)
• M19: 2,182,783 km (0.115 R)
• M20: 2,498,733 km (0.104 R)
• M21: 2,568,895 km (0.043 R)
• M22: 2,639,954 km (0.091 R)
• M23: 2,747,514 km (0.058 R)
• M24: 2,976,549 km (0.088 R)
• M25: 3,060,623 km (0.086 R)
• M26: 3,259,738 km (0.109 R)
• M27: 3,591,246 km (0.094 R)
• M28: 3,791,408 km (0.057 R)
• M29: 3,903,008 km (0.075 R)
• M30: 4,171,237 km (0.114 R)
• M31: 4,466,992 km (0.046 R)
• M32: 4,813,311 km (0.118 R)
• M33: 4,890,354 km (0.05 R)
• M34: 5,011,977 km (0.046 R)
• M35: 5,236,075 km (0.113 R)
• M36: 5,360,541 km (0.104 R)
• M37: 5,451,795 km (0.085 R)
• M38: 5,520,610 km (0.087 R)
• M39: 5,786,894 km (0.091 R)
• M40: 5,857,056 km (0.118 R)
• M41: 5,951,153 km (0.094 R)
• M42: 6,116,907 km (0.074 R)
• M43: 6,224,319 km (0.114 R)
• M44: 6,404,584 km (0.11 R)
• M45: 6,477,289 km (0.055 R)
• M46: 6,623,296 km (0.085 R)
• M47: 6,844,551 km (0.073 R)
• M48: 7,193,563 km (0.095 R)
• M49: 7,357,522 km (0.117 R)
• M50: 7,484,531 km (0.059 R)
• M51: 7,599,572 km (0.116 R)
• M52: 7,844,164 km (0.099 R)
• M53: 8,117,480 km (0.117 R)
• M54: 8,261,991 km (0.058 R)
• M55: 8,367,607 km (0.027 R)
• M56: 8,553,408 km (0.051 R)
• M57: 8,620,129 km (0.079 R)
• M58: 8,713,926 km (0.102 R)
• M59: 8,780,946 km (0.116 R)
• M60: 8,956,425 km (0.078 R)

Planet 3 - Gas Giant

Semi-Major Axis: 2.55 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 343.8

Radius: 8.3

Gravity: 4.99 G

Time & Orbit

Eccentricity (e): 0.229

Orbit Range: 1.97 AU - 3.13 AU

Year: 2629 Days

Day: 13.1 Hours

Environment

Temp: -207 °C

Axial Tilt: 43.8 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (72)

Outer Limit: 83,006,960 km

• M1: 104,569 km (0.036 R)
• M2: 160,967 km (0.077 R)
• M3: 246,537 km (0.073 R)
• M4: 303,534 km (0.075 R)
• M5: 454,628 km (0.106 R)
• M6: 529,576 km (0.045 R)
• M7: 639,232 km (0.105 R)
• M8: 740,809 km (0.073 R)
• M9: 943,065 km (0.116 R)
• M10: 996,471 km (0.036 R)
• M11: 1,153,549 km (0.09 R)
• M12: 1,419,983 km (0.037 R)
• M13: 1,534,126 km (0.091 R)
• M14: 1,673,103 km (0.077 R)
• M15: 2,044,554 km (0.098 R)
• M16: 2,185,924 km (0.072 R)
• M17: 2,318,468 km (0.1 R)
• M18: 2,491,104 km (0.077 R)
• M19: 2,744,971 km (0.111 R)
• M20: 3,020,531 km (0.088 R)
• M21: 3,168,483 km (0.064 R)
• M22: 3,250,313 km (0.09 R)
• M23: 3,388,093 km (0.081 R)
• M24: 3,471,718 km (0.113 R)
• M25: 3,598,427 km (0.091 R)
• M26: 3,712,421 km (0.095 R)
• M27: 3,827,611 km (0.084 R)
• M28: 3,900,316 km (0.069 R)
• M29: 4,076,392 km (0.099 R)
• M30: 4,406,106 km (0.062 R)
• M31: 4,901,125 km (0.064 R)
• M32: 5,676,491 km (0.107 R)
• M33: 5,759,518 km (0.106 R)
• M34: 5,926,768 km (0.089 R)
• M35: 6,010,842 km (0.089 R)
• M36: 6,282,961 km (0.095 R)
• M37: 6,386,184 km (0.096 R)
• M38: 6,455,148 km (0.069 R)
• M39: 6,839,315 km (0.12 R)
• M40: 6,910,075 km (0.056 R)
• M41: 7,052,044 km (0.05 R)
• M42: 7,105,600 km (0.028 R)
• M43: 7,177,107 km (0.113 R)
• M44: 7,267,016 km (0.097 R)
• M45: 7,375,175 km (0.115 R)
• M46: 7,429,629 km (0.068 R)
• M47: 7,961,748 km (0.08 R)
• M48: 8,017,399 km (0.111 R)
• M49: 8,260,645 km (0.091 R)
• M50: 8,487,136 km (0.069 R)
• M51: 8,582,131 km (0.053 R)
• M52: 9,120,833 km (0.072 R)
• M53: 9,492,583 km (0.074 R)
• M54: 9,571,571 km (0.047 R)
• M55: 9,869,420 km (0.086 R)
• M56: 10,130,020 km (0.093 R)
• M57: 10,719,435 km (0.117 R)
• M58: 10,904,638 km (0.052 R)
• M59: 11,153,269 km (0.104 R)
• M60: 11,487,770 km (0.07 R)
• M61: 11,783,076 km (0.118 R)
• M62: 12,230,823 km (0.116 R)
• M63: 12,467,487 km (0.064 R)
• M64: 12,792,712 km (0.12 R)
• M65: 13,473,831 km (0.111 R)
• M66: 13,629,264 km (0.086 R)
• M67: 13,696,134 km (0.036 R)
• M68: 13,897,044 km (0.09 R)
• M69: 14,076,561 km (0.063 R)
• M70: 14,551,534 km (0.101 R)
• M71: 14,802,410 km (0.108 R)
• M72: 15,540,376 km (0.038 R)

Planet 4 - Gas Giant

Semi-Major Axis: 3.58 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 523.4

Radius: 9.1

Gravity: 6.32 G

Time & Orbit

Eccentricity (e): 0.21

Orbit Range: 2.83 AU - 4.33 AU

Year: 4374 Days

Day: 8.2 Hours

Environment

Temp: -202 °C

Axial Tilt: 26.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (81)

Outer Limit: 83,006,960 km

• M1: 117,285 km (0.099 R)
• M2: 189,690 km (0.095 R)
• M3: 419,921 km (0.077 R)
• M4: 491,878 km (0.106 R)
• M5: 629,508 km (0.094 R)
• M6: 703,409 km (0.098 R)
• M7: 791,822 km (0.047 R)
• M8: 992,881 km (0.109 R)
• M9: 1,210,696 km (0.107 R)
• M10: 1,291,329 km (0.058 R)
• M11: 1,415,794 km (0.114 R)
• M12: 1,647,073 km (0.07 R)
• M13: 1,721,871 km (0.031 R)
• M14: 2,327,743 km (0.108 R)
• M15: 2,412,116 km (0.112 R)
• M16: 2,636,513 km (0.099 R)
• M17: 2,742,279 km (0.067 R)
• M18: 3,161,302 km (0.116 R)
• M19: 3,503,283 km (0.096 R)
• M20: 3,877,278 km (0.095 R)
• M21: 3,977,807 km (0.056 R)
• M22: 4,140,570 km (0.105 R)
• M23: 4,202,204 km (0.11 R)
• M24: 5,206,754 km (0.108 R)
• M25: 5,273,325 km (0.089 R)
• M26: 6,235,090 km (0.119 R)
• M27: 6,639,752 km (0.117 R)
• M28: 6,736,093 km (0.072 R)
• M29: 7,374,427 km (0.039 R)
• M30: 7,474,358 km (0.045 R)
• M31: 8,576,895 km (0.119 R)
• M32: 8,734,720 km (0.096 R)
• M33: 9,375,747 km (0.118 R)
• M34: 9,538,510 km (0.03 R)
• M35: 10,365,786 km (0.067 R)
• M36: 10,646,581 km (0.101 R)
• M37: 10,759,677 km (0.058 R)
• M38: 11,158,505 km (0.102 R)
• M39: 11,446,481 km (0.076 R)
• M40: 11,504,375 km (0.081 R)
• M41: 11,941,500 km (0.084 R)
• M42: 12,473,321 km (0.097 R)
• M43: 12,712,079 km (0.055 R)
• M44: 14,238,875 km (0.11 R)
• M45: 14,676,748 km (0.07 R)
• M46: 14,739,579 km (0.033 R)
• M47: 14,865,690 km (0.083 R)
• M48: 14,928,970 km (0.051 R)
• M49: 15,214,253 km (0.117 R)
• M50: 15,565,658 km (0.109 R)
• M51: 15,822,817 km (0.079 R)
• M52: 16,211,173 km (0.117 R)
• M53: 16,406,548 km (0.039 R)
• M54: 16,537,297 km (0.092 R)
• M55: 16,898,575 km (0.106 R)
• M56: 17,063,582 km (0.054 R)
• M57: 17,162,915 km (0.083 R)
• M58: 17,461,811 km (0.107 R)
• M59: 18,031,331 km (0.06 R)
• M60: 18,132,459 km (0.07 R)
• M61: 18,470,999 km (0.112 R)
• M62: 19,016,881 km (0.105 R)
• M63: 19,119,954 km (0.105 R)
• M64: 19,223,027 km (0.095 R)
• M65: 19,291,842 km (0.075 R)
• M66: 20,124,654 km (0.107 R)
• M67: 20,264,677 km (0.106 R)
• M68: 20,615,933 km (0.095 R)
• M69: 21,360,182 km (0.118 R)
• M70: 21,431,391 km (0.06 R)
• M71: 21,969,046 km (0.056 R)
• M72: 22,185,364 km (0.094 R)
• M73: 22,583,594 km (0.084 R)
• M74: 22,692,651 km (0.114 R)
• M75: 22,947,865 km (0.091 R)
• M76: 23,167,325 km (0.093 R)
• M77: 23,240,628 km (0.12 R)
• M78: 23,424,184 km (0.075 R)
• M79: 23,608,190 km (0.106 R)
• M80: 23,682,091 km (0.027 R)
• M81: 25,211,131 km (0.108 R)

Planet 5 - Ice Giant

Semi-Major Axis: 7.39 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 396.2

Radius: 6.9

Gravity: 8.32 G

Time & Orbit

Eccentricity (e): 0.121

Orbit Range: 6.5 AU - 8.28 AU

Year: 12971 Days

Day: 21.1 Hours

Environment

Temp: -226 °C

Axial Tilt: 18.8 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (91)

Outer Limit: 83,006,960 km

• M1: 357,240 km (0.076 R)
• M2: 436,975 km (0.102 R)
• M3: 748,139 km (0.074 R)
• M4: 800,199 km (0.074 R)
• M5: 853,456 km (0.102 R)
• M6: 908,059 km (0.065 R)
• M7: 1,430,604 km (0.039 R)
• M8: 1,474,137 km (0.095 R)
• M9: 1,934,899 km (0.063 R)
• M10: 2,007,753 km (0.073 R)
• M11: 2,333,876 km (0.076 R)
• M12: 2,490,057 km (0.091 R)
• M13: 2,622,899 km (0.06 R)
• M14: 2,785,363 km (0.101 R)
• M15: 3,035,341 km (0.102 R)
• M16: 3,091,889 km (0.059 R)
• M17: 3,380,014 km (0.077 R)
• M18: 3,497,598 km (0.087 R)
• M19: 4,012,664 km (0.1 R)
• M20: 4,294,955 km (0.104 R)
• M21: 5,179,976 km (0.067 R)
• M22: 5,349,919 km (0.072 R)
• M23: 6,444,377 km (0.108 R)
• M24: 6,849,039 km (0.117 R)
• M25: 6,960,789 km (0.11 R)
• M26: 7,837,881 km (0.101 R)
• M27: 8,870,705 km (0.072 R)
• M28: 9,074,158 km (0.078 R)
• M29: 9,155,988 km (0.045 R)
• M30: 9,444,413 km (0.054 R)
• M31: 10,072,425 km (0.113 R)
• M32: 10,199,583 km (0.106 R)
• M33: 10,498,479 km (0.105 R)
• M34: 10,670,667 km (0.038 R)
• M35: 11,368,391 km (0.079 R)
• M36: 11,678,208 km (0.107 R)
• M37: 12,306,370 km (0.119 R)
• M38: 12,397,026 km (0.111 R)
• M39: 14,066,089 km (0.108 R)
• M40: 14,255,929 km (0.119 R)
• M41: 14,398,795 km (0.088 R)
• M42: 14,638,002 km (0.096 R)
• M43: 15,217,395 km (0.111 R)
• M44: 16,001,736 km (0.093 R)
• M45: 17,354,699 km (0.058 R)
• M46: 17,507,289 km (0.114 R)
• M47: 17,865,127 km (0.112 R)
• M48: 17,967,901 km (0.073 R)
• M49: 18,744,164 km (0.117 R)
• M50: 19,425,732 km (0.1 R)
• M51: 20,168,785 km (0.062 R)
• M52: 20,382,859 km (0.084 R)
• M53: 22,232,338 km (0.091 R)
• M54: 22,730,798 km (0.059 R)
• M55: 22,842,099 km (0.092 R)
• M56: 23,738,789 km (0.071 R)
• M57: 23,964,831 km (0.064 R)
• M58: 24,590,000 km (0.118 R)
• M59: 25,566,575 km (0.073 R)
• M60: 25,856,197 km (0.088 R)
• M61: 28,092,984 km (0.094 R)
• M62: 28,451,869 km (0.1 R)
• M63: 28,631,836 km (0.076 R)
• M64: 29,476,615 km (0.071 R)
• M65: 29,780,448 km (0.11 R)
• M66: 30,024,143 km (0.084 R)
• M67: 30,085,179 km (0.098 R)
• M68: 30,268,586 km (0.118 R)
• M69: 30,574,962 km (0.104 R)
• M70: 31,438,441 km (0.036 R)
• M71: 31,624,541 km (0.062 R)
• M72: 33,631,845 km (0.106 R)
• M73: 33,885,713 km (0.065 R)
• M74: 34,140,179 km (0.091 R)
• M75: 34,650,906 km (0.076 R)
• M76: 35,550,887 km (0.06 R)
• M77: 36,915,369 km (0.054 R)
• M78: 40,366,741 km (0.059 R)
• M79: 40,434,060 km (0.115 R)
• M80: 41,177,711 km (0.078 R)
• M81: 41,994,067 km (0.113 R)
• M82: 42,404,264 km (0.114 R)
• M83: 42,815,808 km (0.102 R)
• M84: 43,228,698 km (0.09 R)
• M85: 43,850,427 km (0.074 R)
• M86: 44,614,423 km (0.115 R)
• M87: 45,032,849 km (0.041 R)
• M88: 45,803,577 km (0.109 R)
• M89: 45,873,888 km (0.084 R)
• M90: 46,014,510 km (0.109 R)
• M91: 47,074,112 km (0.085 R)

Planet 6 - Ice Giant

Semi-Major Axis: 9.49 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 998.4

Radius: 6

Gravity: 27.73 G

Time & Orbit

Eccentricity (e): 0.053

Orbit Range: 8.99 AU - 9.99 AU

Year: 18876 Days

Day: 21.4 Hours

Environment

Temp: -224 °C

Axial Tilt: 7.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (94)

Outer Limit: 83,006,960 km

• M1: 88,263 km (0.067 R)
• M2: 1,676,843 km (0.095 R)
• M3: 1,846,636 km (0.056 R)
• M4: 2,202,829 km (0.11 R)
• M5: 2,276,580 km (0.085 R)
• M6: 2,541,369 km (0.115 R)
• M7: 2,657,905 km (0.044 R)
• M8: 2,896,364 km (0.053 R)
• M9: 3,266,769 km (0.097 R)
• M10: 4,701,113 km (0.116 R)
• M11: 5,283,049 km (0.097 R)
• M12: 5,582,544 km (0.097 R)
• M13: 5,836,411 km (0.069 R)
• M14: 5,887,574 km (0.092 R)
• M15: 6,997,291 km (0.111 R)
• M16: 7,492,310 km (0.089 R)
• M17: 7,998,549 km (0.118 R)
• M18: 8,055,546 km (0.097 R)
• M19: 8,227,135 km (0.116 R)
• M20: 8,400,070 km (0.112 R)
• M21: 8,984,848 km (0.096 R)
• M22: 12,427,993 km (0.1 R)
• M23: 15,369,386 km (0.087 R)
• M24: 15,796,189 km (0.102 R)
• M25: 16,661,463 km (0.05 R)
• M26: 17,173,237 km (0.051 R)
• M27: 17,320,441 km (0.118 R)
• M28: 17,468,095 km (0.113 R)
• M29: 18,287,442 km (0.075 R)
• M30: 18,437,638 km (0.049 R)
• M31: 18,588,433 km (0.113 R)
• M32: 19,043,061 km (0.057 R)
• M33: 20,428,786 km (0.062 R)
• M34: 20,506,727 km (0.105 R)
• M35: 22,326,285 km (0.051 R)
• M36: 22,486,954 km (0.055 R)
• M37: 22,809,487 km (0.098 R)
• M38: 23,052,284 km (0.116 R)
• M39: 24,032,300 km (0.048 R)
• M40: 25,360,130 km (0.101 R)
• M41: 26,032,872 km (0.086 R)
• M42: 26,541,355 km (0.105 R)
• M43: 27,740,382 km (0.107 R)
• M44: 27,913,018 km (0.086 R)
• M45: 28,694,816 km (0.116 R)
• M46: 29,483,646 km (0.057 R)
• M47: 30,102,084 km (0.111 R)
• M48: 31,621,998 km (0.104 R)
• M49: 32,892,233 km (0.112 R)
• M50: 36,801,824 km (0.042 R)
• M51: 37,658,571 km (0.042 R)
• M52: 37,849,757 km (0.096 R)
• M53: 38,137,284 km (0.112 R)
• M54: 40,072,482 km (0.107 R)
• M55: 42,237,762 km (0.054 R)
• M56: 42,934,738 km (0.039 R)
• M57: 43,034,520 km (0.104 R)
• M58: 43,535,075 km (0.046 R)
• M59: 44,037,424 km (0.079 R)
• M60: 44,339,911 km (0.047 R)
• M61: 44,642,997 km (0.048 R)
• M62: 47,401,432 km (0.038 R)
• M63: 48,540,919 km (0.069 R)
• M64: 48,749,009 km (0.119 R)
• M65: 48,957,549 km (0.06 R)
• M66: 50,741,354 km (0.103 R)
• M67: 51,270,033 km (0.057 R)
• M68: 54,048,514 km (0.108 R)
• M69: 58,639,074 km (0.077 R)
• M70: 60,085,087 km (0.075 R)
• M71: 60,196,687 km (0.097 R)
• M72: 61,430,122 km (0.057 R)
• M73: 61,993,507 km (0.088 R)
• M74: 62,445,592 km (0.096 R)
• M75: 63,011,970 km (0.091 R)
• M76: 63,921,973 km (0.082 R)
• M77: 64,264,253 km (0.062 R)
• M78: 66,100,418 km (0.12 R)
• M79: 66,677,716 km (0.044 R)
• M80: 68,769,842 km (0.116 R)
• M81: 69,003,663 km (0.085 R)
• M82: 70,294,244 km (0.052 R)
• M83: 70,529,711 km (0.093 R)
• M84: 70,647,594 km (0.067 R)
• M85: 71,592,754 km (0.077 R)
• M86: 73,376,260 km (0.116 R)
• M87: 74,453,215 km (0.062 R)
• M88: 74,693,319 km (0.11 R)
• M89: 76,380,933 km (0.027 R)
• M90: 77,594,022 km (0.107 R)
• M91: 80,654,645 km (0.111 R)
• M92: 80,901,182 km (0.076 R)
• M93: 82,013,741 km (0.096 R)
• M94: 82,882,606 km (0.071 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: 187 - 11,573 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit