🌌 Stone's Star System Generator

Asteroid Belt

Center: 0.39 AU

Composition

Type: Inner System (Rocky)

A dense region of planetesimals and debris.

Boundary

Planet 1 - Gas Giant

Semi-Major Axis: 0.77 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 39.3

Radius: 12.6

Gravity: 0.25 G

Time & Orbit

Eccentricity (e): 0.008

Orbit Range: 0.76 AU - 0.78 AU

Year: 451 Days

Day: 12 Hours

Environment

Temp: -162 °C

Axial Tilt: 21.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (20)

Outer Limit: 55,727,242 km

• M1: 157,078 km (0.091 R)
• M2: 244,144 km (0.045 R)
• M3: 333,304 km (0.114 R)
• M4: 456,274 km (0.068 R)
• M5: 540,946 km (0.109 R)
• M6: 668,403 km (0.108 R)
• M7: 778,956 km (0.052 R)
• M8: 905,815 km (0.115 R)
• M9: 1,018,612 km (0.082 R)
• M10: 1,154,148 km (0.114 R)
• M11: 1,233,285 km (0.108 R)
• M12: 1,314,516 km (0.105 R)
• M13: 1,422,227 km (0.07 R)
• M14: 1,544,299 km (0.104 R)
• M15: 1,743,114 km (0.047 R)
• M16: 1,823,299 km (0.074 R)
• M17: 1,923,081 km (0.088 R)
• M18: 2,006,107 km (0.12 R)
• M19: 2,093,473 km (0.088 R)
• M20: 2,220,780 km (0.088 R)

Planet 2 - Gas Giant

Semi-Major Axis: 1.07 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 94.2

Radius: 14.4

Gravity: 0.45 G

Time & Orbit

Eccentricity (e): 0.036

Orbit Range: 1.03 AU - 1.11 AU

Year: 738 Days

Day: 9.5 Hours

Environment

Temp: -187 °C

Axial Tilt: 36.4 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (32)

Outer Limit: 55,727,242 km

• M1: 186,698 km (0.104 R)
• M2: 293,661 km (0.044 R)
• M3: 414,386 km (0.087 R)
• M4: 527,482 km (0.082 R)
• M5: 633,547 km (0.083 R)
• M6: 742,155 km (0.108 R)
• M7: 854,653 km (0.088 R)
• M8: 999,314 km (0.082 R)
• M9: 1,122,433 km (0.093 R)
• M10: 1,215,333 km (0.118 R)
• M11: 1,307,186 km (0.069 R)
• M12: 1,409,810 km (0.1 R)
• M13: 1,545,645 km (0.083 R)
• M14: 1,650,513 km (0.112 R)
• M15: 1,762,413 km (0.049 R)
• M16: 1,928,317 km (0.026 R)
• M17: 2,022,862 km (0.108 R)
• M18: 2,251,448 km (0.032 R)
• M19: 2,366,638 km (0.049 R)
• M20: 2,473,451 km (0.082 R)
• M21: 2,566,351 km (0.098 R)
• M22: 2,825,605 km (0.085 R)
• M23: 2,928,378 km (0.119 R)
• M24: 3,110,140 km (0.081 R)
• M25: 3,210,819 km (0.057 R)
• M26: 3,307,011 km (0.107 R)
• M27: 3,438,806 km (0.117 R)
• M28: 3,537,242 km (0.037 R)
• M29: 3,713,468 km (0.081 R)
• M30: 3,808,612 km (0.115 R)
• M31: 4,087,014 km (0.116 R)
• M32: 4,284,633 km (0.042 R)

Planet 3 - Gas Giant

Semi-Major Axis: 1.08 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 131.2

Radius: 12.3

Gravity: 0.87 G

Time & Orbit

Eccentricity (e): 0.216

Orbit Range: 0.85 AU - 1.31 AU

Year: 748 Days

Day: 6.5 Hours

Environment

Temp: -180 °C

Axial Tilt: 32.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (37)

Outer Limit: 55,727,242 km

• M1: 154,235 km (0.101 R)
• M2: 264,639 km (0.088 R)
• M3: 440,267 km (0.093 R)
• M4: 575,054 km (0.071 R)
• M5: 673,938 km (0.109 R)
• M6: 779,555 km (0.102 R)
• M7: 910,901 km (0.079 R)
• M8: 989,440 km (0.106 R)
• M9: 1,078,900 km (0.103 R)
• M10: 1,162,824 km (0.063 R)
• M11: 1,270,984 km (0.091 R)
• M12: 1,351,168 km (0.039 R)
• M13: 1,474,885 km (0.051 R)
• M14: 1,592,918 km (0.112 R)
• M15: 1,670,111 km (0.107 R)
• M16: 1,763,759 km (0.119 R)
• M17: 1,884,484 km (0.054 R)
• M18: 1,982,172 km (0.095 R)
• M19: 2,065,797 km (0.089 R)
• M20: 2,177,397 km (0.117 R)
• M21: 2,263,865 km (0.106 R)
• M22: 2,412,415 km (0.082 R)
• M23: 2,490,805 km (0.092 R)
• M24: 2,650,126 km (0.082 R)
• M25: 2,731,059 km (0.101 R)
• M26: 2,860,012 km (0.074 R)
• M27: 3,166,987 km (0.117 R)
• M28: 3,321,522 km (0.063 R)
• M29: 3,561,177 km (0.093 R)
• M30: 3,695,965 km (0.07 R)
• M31: 3,997,554 km (0.108 R)
• M32: 4,144,609 km (0.112 R)
• M33: 4,307,222 km (0.025 R)
• M34: 4,444,254 km (0.118 R)
• M35: 4,575,900 km (0.07 R)
• M36: 4,779,353 km (0.105 R)
• M37: 4,857,293 km (0.074 R)

Planet 4 - Gas Giant

Semi-Major Axis: 1.41 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 971.5

Radius: 12.5

Gravity: 6.22 G

Time & Orbit

Eccentricity (e): 0.055

Orbit Range: 1.33 AU - 1.49 AU

Year: 1116 Days

Day: 7.5 Hours

Environment

Temp: -195 °C

Axial Tilt: 22.4 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (58)

Outer Limit: 55,727,242 km

• M1: 155,881 km (0.109 R)
• M2: 374,144 km (0.087 R)
• M3: 461,061 km (0.072 R)
• M4: 545,434 km (0.118 R)
• M5: 700,417 km (0.117 R)
• M6: 893,398 km (0.099 R)
• M7: 1,160,580 km (0.082 R)
• M8: 1,266,645 km (0.094 R)
• M9: 1,359,097 km (0.096 R)
• M10: 1,445,265 km (0.091 R)
• M11: 1,533,378 km (0.105 R)
• M12: 1,837,660 km (0.045 R)
• M13: 2,011,942 km (0.084 R)
• M14: 2,091,229 km (0.118 R)
• M15: 2,253,094 km (0.094 R)
• M16: 2,440,240 km (0.111 R)
• M17: 2,567,847 km (0.036 R)
• M18: 2,874,673 km (0.118 R)
• M19: 3,205,134 km (0.075 R)
• M20: 3,428,484 km (0.115 R)
• M21: 3,644,653 km (0.117 R)
• M22: 3,816,092 km (0.116 R)
• M23: 4,372,147 km (0.073 R)
• M24: 4,502,148 km (0.099 R)
• M25: 4,752,874 km (0.101 R)
• M26: 4,913,542 km (0.081 R)
• M27: 5,008,088 km (0.086 R)
• M28: 5,309,378 km (0.119 R)
• M29: 5,448,205 km (0.101 R)
• M30: 5,943,972 km (0.105 R)
• M31: 6,161,039 km (0.116 R)
• M32: 6,277,725 km (0.118 R)
• M33: 6,439,590 km (0.049 R)
• M34: 6,528,451 km (0.098 R)
• M35: 6,767,508 km (0.047 R)
• M36: 6,872,975 km (0.074 R)
• M37: 7,085,554 km (0.045 R)
• M38: 7,284,818 km (0.092 R)
• M39: 7,501,735 km (0.104 R)
• M40: 7,894,280 km (0.085 R)
• M41: 8,229,229 km (0.117 R)
• M42: 8,536,204 km (0.107 R)
• M43: 8,683,109 km (0.05 R)
• M44: 8,781,395 km (0.116 R)
• M45: 8,896,585 km (0.117 R)
• M46: 9,463,262 km (0.067 R)
• M47: 9,564,540 km (0.107 R)
• M48: 10,076,165 km (0.073 R)
• M49: 10,317,915 km (0.111 R)
• M50: 10,579,113 km (0.081 R)
• M51: 10,824,902 km (0.102 R)
• M52: 10,930,967 km (0.064 R)
• M53: 11,232,855 km (0.057 R)
• M54: 11,519,634 km (0.106 R)
• M55: 11,609,842 km (0.118 R)
• M56: 11,881,661 km (0.095 R)
• M57: 12,173,826 km (0.073 R)
• M58: 12,357,682 km (0.047 R)

Planet 5 - Gas Giant

Semi-Major Axis: 1.97 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 213.6

Radius: 10.5

Gravity: 1.94 G

Time & Orbit

Eccentricity (e): 0.178

Orbit Range: 1.62 AU - 2.32 AU

Year: 1844 Days

Day: 7.3 Hours

Environment

Temp: -206 °C

Axial Tilt: 10.1 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (47)

Outer Limit: 55,727,242 km

• M1: 138,079 km (0.099 R)
• M2: 239,955 km (0.056 R)
• M3: 323,131 km (0.087 R)
• M4: 406,757 km (0.116 R)
• M5: 479,312 km (0.064 R)
• M6: 573,708 km (0.059 R)
• M7: 815,009 km (0.111 R)
• M8: 991,834 km (0.038 R)
• M9: 1,131,409 km (0.087 R)
• M10: 1,255,276 km (0.074 R)
• M11: 1,517,222 km (0.108 R)
• M12: 1,771,538 km (0.103 R)
• M13: 1,865,037 km (0.106 R)
• M14: 1,942,977 km (0.072 R)
• M15: 2,039,617 km (0.046 R)
• M16: 2,395,511 km (0.119 R)
• M17: 2,537,778 km (0.057 R)
• M18: 2,981,486 km (0.116 R)
• M19: 3,062,867 km (0.097 R)
• M20: 3,375,078 km (0.042 R)
• M21: 3,534,998 km (0.117 R)
• M22: 3,675,769 km (0.04 R)
• M23: 4,211,479 km (0.111 R)
• M24: 4,337,740 km (0.092 R)
• M25: 4,511,872 km (0.119 R)
• M26: 4,652,943 km (0.033 R)
• M27: 4,783,691 km (0.027 R)
• M28: 5,024,244 km (0.09 R)
• M29: 5,219,619 km (0.075 R)
• M30: 5,668,563 km (0.082 R)
• M31: 5,936,193 km (0.076 R)
• M32: 6,142,937 km (0.074 R)
• M33: 6,417,898 km (0.115 R)
• M34: 6,497,185 km (0.098 R)
• M35: 7,253,103 km (0.045 R)
• M36: 7,488,121 km (0.104 R)
• M37: 7,585,659 km (0.091 R)
• M38: 7,979,999 km (0.106 R)
• M39: 8,108,205 km (0.054 R)
• M40: 8,208,286 km (0.118 R)
• M41: 8,438,816 km (0.088 R)
• M42: 8,525,732 km (0.093 R)
• M43: 8,700,762 km (0.069 R)
• M44: 9,083,732 km (0.039 R)
• M45: 9,217,622 km (0.094 R)
• M46: 9,881,687 km (0.094 R)
• M47: 10,327,788 km (0.084 R)

Planet 6 - Gas Giant

Semi-Major Axis: 1.98 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 663.2

Radius: 13.7

Gravity: 3.53 G

Time & Orbit

Eccentricity (e): 0.243

Orbit Range: 1.5 AU - 2.46 AU

Year: 1858 Days

Day: 9.2 Hours

Environment

Temp: -192 °C

Axial Tilt: 179.4 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (61)

Outer Limit: 55,727,242 km

• M1: 171,738 km (0.096 R)
• M2: 367,263 km (0.118 R)
• M3: 453,132 km (0.062 R)
• M4: 542,143 km (0.108 R)
• M5: 638,783 km (0.103 R)
• M6: 820,993 km (0.097 R)
• M7: 927,806 km (0.107 R)
• M8: 1,031,029 km (0.101 R)
• M9: 1,193,791 km (0.084 R)
• M10: 1,536,071 km (0.067 R)
• M11: 1,724,564 km (0.066 R)
• M12: 2,102,000 km (0.092 R)
• M13: 2,432,761 km (0.11 R)
• M14: 3,025,617 km (0.107 R)
• M15: 3,117,769 km (0.085 R)
• M16: 3,359,220 km (0.109 R)
• M17: 3,482,339 km (0.063 R)
• M18: 3,579,129 km (0.06 R)
• M19: 3,775,401 km (0.029 R)
• M20: 3,860,672 km (0.074 R)
• M21: 4,004,286 km (0.118 R)
• M22: 4,326,520 km (0.103 R)
• M23: 4,520,997 km (0.113 R)
• M24: 4,825,878 km (0.1 R)
• M25: 5,121,782 km (0.099 R)
• M26: 5,295,914 km (0.077 R)
• M27: 5,879,496 km (0.113 R)
• M28: 5,995,434 km (0.114 R)
• M29: 6,415,505 km (0.113 R)
• M30: 6,655,011 km (0.116 R)
• M31: 6,810,593 km (0.12 R)
• M32: 6,984,874 km (0.066 R)
• M33: 7,072,688 km (0.089 R)
• M34: 7,320,123 km (0.115 R)
• M35: 7,588,651 km (0.088 R)
• M36: 8,264,684 km (0.106 R)
• M37: 8,525,583 km (0.107 R)
• M38: 9,170,499 km (0.11 R)
• M39: 9,285,989 km (0.083 R)
• M40: 10,306,994 km (0.106 R)
• M41: 10,407,075 km (0.103 R)
• M42: 10,567,893 km (0.089 R)
• M43: 10,689,067 km (0.093 R)
• M44: 10,851,231 km (0.064 R)
• M45: 11,178,252 km (0.037 R)
• M46: 11,508,415 km (0.098 R)
• M47: 11,653,973 km (0.094 R)
• M48: 11,883,756 km (0.104 R)
• M49: 12,094,090 km (0.083 R)
• M50: 12,220,800 km (0.061 R)
• M51: 12,326,865 km (0.071 R)
• M52: 12,561,135 km (0.085 R)
• M53: 13,229,239 km (0.077 R)
• M54: 13,337,997 km (0.094 R)
• M55: 13,688,355 km (0.055 R)
• M56: 13,886,871 km (0.053 R)
• M57: 14,108,426 km (0.094 R)
• M58: 14,577,565 km (0.079 R)
• M59: 14,757,680 km (0.106 R)
• M60: 14,983,872 km (0.092 R)
• M61: 15,348,143 km (0.079 R)

Planet 7 - Gas Giant

Semi-Major Axis: 4.83 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 224.9

Radius: 13.7

Gravity: 1.2 G

Time & Orbit

Eccentricity (e): 0.022

Orbit Range: 4.72 AU - 4.94 AU

Year: 7079 Days

Day: 12.1 Hours

Environment

Temp: -217 °C

Axial Tilt: 18.4 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (63)

Outer Limit: 55,727,242 km

• M1: 189,092 km (0.112 R)
• M2: 292,613 km (0.086 R)
• M3: 839,992 km (0.067 R)
• M4: 1,122,433 km (0.1 R)
• M5: 1,379,442 km (0.041 R)
• M6: 1,522,607 km (0.076 R)
• M7: 1,626,129 km (0.099 R)
• M8: 2,348,537 km (0.111 R)
• M9: 2,504,268 km (0.035 R)
• M10: 2,663,590 km (0.112 R)
• M11: 3,029,955 km (0.109 R)
• M12: 3,124,052 km (0.089 R)
• M13: 3,257,643 km (0.093 R)
• M14: 3,432,074 km (0.027 R)
• M15: 3,530,510 km (0.107 R)
• M16: 4,849,664 km (0.057 R)
• M17: 5,162,024 km (0.111 R)
• M18: 5,320,747 km (0.119 R)
• M19: 5,550,380 km (0.1 R)
• M20: 6,648,279 km (0.117 R)
• M21: 6,846,047 km (0.103 R)
• M22: 7,020,778 km (0.064 R)
• M23: 7,222,286 km (0.083 R)
• M24: 8,551,463 km (0.031 R)
• M25: 9,674,195 km (0.111 R)
• M26: 9,870,468 km (0.101 R)
• M27: 10,324,198 km (0.056 R)
• M28: 12,146,450 km (0.115 R)
• M29: 12,267,474 km (0.107 R)
• M30: 12,816,798 km (0.1 R)
• M31: 13,343,083 km (0.028 R)
• M32: 13,467,848 km (0.108 R)
• M33: 13,750,288 km (0.097 R)
• M34: 14,002,959 km (0.09 R)
• M35: 14,225,262 km (0.115 R)
• M36: 14,448,761 km (0.114 R)
• M37: 14,544,952 km (0.092 R)
• M38: 14,641,293 km (0.112 R)
• M39: 15,191,365 km (0.075 R)
• M40: 15,452,562 km (0.113 R)
• M41: 15,682,494 km (0.12 R)
• M42: 16,145,500 km (0.109 R)
• M43: 16,445,444 km (0.075 R)
• M44: 16,646,503 km (0.098 R)
• M45: 16,915,929 km (0.12 R)
• M46: 17,220,660 km (0.081 R)
• M47: 17,424,861 km (0.11 R)
• M48: 18,911,714 km (0.03 R)
• M49: 19,404,639 km (0.103 R)
• M50: 20,295,345 km (0.078 R)
• M51: 20,403,055 km (0.119 R)
• M52: 20,691,480 km (0.102 R)
• M53: 21,308,721 km (0.112 R)
• M54: 21,931,945 km (0.113 R)
• M55: 22,116,400 km (0.058 R)
• M56: 22,375,503 km (0.097 R)
• M57: 22,971,651 km (0.051 R)
• M58: 23,422,239 km (0.099 R)
• M59: 23,686,280 km (0.103 R)
• M60: 23,951,517 km (0.097 R)
• M61: 24,484,683 km (0.066 R)
• M62: 25,291,914 km (0.095 R)
• M63: 26,186,060 km (0.086 R)

Planet 8 - Ice Giant

Semi-Major Axis: 7.31 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 619.7

Radius: 5.5

Gravity: 20.49 G

Time & Orbit

Eccentricity (e): 0.165

Orbit Range: 6.1 AU - 8.52 AU

Year: 13180 Days

Day: 17.3 Hours

Environment

Temp: -240 °C

Axial Tilt: 5.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (93)

Outer Limit: 55,727,242 km

• M1: 100,979 km (0.094 R)
• M2: 141,520 km (0.042 R)
• M3: 387,010 km (0.064 R)
• M4: 1,399,338 km (0.118 R)
• M5: 1,546,244 km (0.056 R)
• M6: 2,617,215 km (0.101 R)
• M7: 2,737,641 km (0.094 R)
• M8: 2,984,029 km (0.067 R)
• M9: 3,109,841 km (0.07 R)
• M10: 3,205,434 km (0.108 R)
• M11: 3,630,591 km (0.112 R)
• M12: 3,935,322 km (0.069 R)
• M13: 4,073,400 km (0.096 R)
• M14: 4,248,280 km (0.074 R)
• M15: 4,497,211 km (0.075 R)
• M16: 5,463,015 km (0.081 R)
• M17: 5,694,742 km (0.07 R)
• M18: 5,850,922 km (0.114 R)
• M19: 6,288,047 km (0.107 R)
• M20: 6,490,154 km (0.066 R)
• M21: 6,818,073 km (0.026 R)
• M22: 7,109,340 km (0.052 R)
• M23: 7,833,842 km (0.116 R)
• M24: 8,182,704 km (0.112 R)
• M25: 8,447,792 km (0.099 R)
• M26: 9,351,662 km (0.056 R)
• M27: 10,476,189 km (0.085 R)
• M28: 11,054,235 km (0.104 R)
• M29: 11,102,855 km (0.049 R)
• M30: 11,200,393 km (0.084 R)
• M31: 11,741,787 km (0.092 R)
• M32: 13,416,386 km (0.119 R)
• M33: 13,990,991 km (0.076 R)
• M34: 14,096,308 km (0.074 R)
• M35: 14,467,161 km (0.078 R)
• M36: 14,841,006 km (0.083 R)
• M37: 15,002,273 km (0.107 R)
• M38: 15,707,776 km (0.093 R)
• M39: 15,981,989 km (0.108 R)
• M40: 16,147,295 km (0.06 R)
• M41: 16,982,201 km (0.09 R)
• M42: 18,059,754 km (0.068 R)
• M43: 18,231,941 km (0.116 R)
• M44: 18,635,856 km (0.091 R)
• M45: 19,042,612 km (0.101 R)
• M46: 19,452,361 km (0.066 R)
• M47: 19,569,945 km (0.103 R)
• M48: 19,864,952 km (0.089 R)
• M49: 20,161,455 km (0.112 R)
• M50: 20,818,937 km (0.04 R)
• M51: 21,726,697 km (0.114 R)
• M52: 22,216,181 km (0.048 R)
• M53: 22,523,904 km (0.113 R)
• M54: 22,833,123 km (0.079 R)
• M55: 24,463,291 km (0.069 R)
• M56: 24,526,720 km (0.052 R)
• M57: 24,844,766 km (0.114 R)
• M58: 25,484,895 km (0.09 R)
• M59: 26,260,261 km (0.076 R)
• M60: 27,043,405 km (0.058 R)
• M61: 27,109,079 km (0.091 R)
• M62: 27,371,922 km (0.089 R)
• M63: 27,569,691 km (0.117 R)
• M64: 28,033,145 km (0.082 R)
• M65: 28,298,980 km (0.11 R)
• M66: 30,047,630 km (0.05 R)
• M67: 30,319,748 km (0.072 R)
• M68: 30,456,182 km (0.115 R)
• M69: 31,761,872 km (0.113 R)
• M70: 31,969,663 km (0.092 R)
• M71: 32,665,742 km (0.096 R)
• M72: 38,042,439 km (0.079 R)
• M73: 38,779,807 km (0.057 R)
• M74: 38,853,709 km (0.111 R)
• M75: 39,001,960 km (0.09 R)
• M76: 40,268,605 km (0.12 R)
• M77: 40,718,895 km (0.099 R)
• M78: 40,793,993 km (0.101 R)
• M79: 41,246,227 km (0.093 R)
• M80: 42,842,137 km (0.094 R)
• M81: 43,686,019 km (0.082 R)
• M82: 43,917,148 km (0.048 R)
• M83: 44,148,725 km (0.114 R)
• M84: 44,612,927 km (0.081 R)
• M85: 46,093,797 km (0.092 R)
• M86: 46,329,114 km (0.047 R)
• M87: 51,280,355 km (0.064 R)
• M88: 52,094,467 km (0.098 R)
• M89: 52,995,046 km (0.12 R)
• M90: 53,570,698 km (0.106 R)
• M91: 54,314,050 km (0.087 R)
• M92: 54,811,463 km (0.071 R)
• M93: 55,227,046 km (0.118 R)

Kuiper Belt

Range: 30 - 59 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 430 - 12,283 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit