🌌 Stone's Star System Generator

Asteroid Belt

Center: 0.26 AU

Composition

Type: Inner (Rocky/Metallic)

A dense region of planetesimals and debris.

Boundary

Planet 1 - Gas Giant

Semi-Major Axis: 0.52 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 707.1

Radius: 10.8

Gravity: 6.06 G

Time & Orbit

Eccentricity (e): 0.113

Orbit Range: 0.46 AU - 0.58 AU

Year: 259 Days

Day: 10.3 Hours

Environment

Temp: -143 °C

Axial Tilt: 37.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (37)

Outer Limit: 32,359,453 km

• M1: 134,488 km (0.093 R)
• M2: 246,986 km (0.084 R)
• M3: 331,210 km (0.095 R)
• M4: 439,967 km (0.073 R)
• M5: 529,277 km (0.081 R)
• M6: 632,051 km (0.063 R)
• M7: 700,567 km (0.098 R)
• M8: 791,971 km (0.047 R)
• M9: 866,920 km (0.036 R)
• M10: 944,411 km (0.052 R)
• M11: 1,111,063 km (0.06 R)
• M12: 1,211,892 km (0.052 R)
• M13: 1,287,589 km (0.04 R)
• M14: 1,478,027 km (0.103 R)
• M15: 1,546,393 km (0.081 R)
• M16: 1,629,270 km (0.036 R)
• M17: 1,744,910 km (0.084 R)
• M18: 1,891,366 km (0.115 R)
• M19: 1,961,378 km (0.096 R)
• M20: 2,109,031 km (0.111 R)
• M21: 2,260,424 km (0.032 R)
• M22: 2,405,534 km (0.084 R)
• M23: 2,548,400 km (0.057 R)
• M24: 2,652,370 km (0.12 R)
• M25: 2,864,500 km (0.08 R)
• M26: 2,994,501 km (0.104 R)
• M27: 3,131,981 km (0.103 R)
• M28: 3,305,515 km (0.107 R)
• M29: 3,379,266 km (0.116 R)
• M30: 3,488,024 km (0.1 R)
• M31: 3,586,310 km (0.065 R)
• M32: 3,709,130 km (0.109 R)
• M33: 3,785,724 km (0.104 R)
• M34: 3,904,804 km (0.108 R)
• M35: 4,019,096 km (0.117 R)
• M36: 4,140,719 km (0.046 R)
• M37: 4,208,039 km (0.064 R)

Planet 2 - Gas Giant

Semi-Major Axis: 0.61 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 799.9

Radius: 11.7

Gravity: 5.84 G

Time & Orbit

Eccentricity (e): 0.06

Orbit Range: 0.57 AU - 0.65 AU

Year: 329 Days

Day: 7.2 Hours

Environment

Temp: -159 °C

Axial Tilt: 14.3 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (41)

Outer Limit: 32,359,453 km

• M1: 157,676 km (0.045 R)
• M2: 272,567 km (0.056 R)
• M3: 347,067 km (0.086 R)
• M4: 452,833 km (0.093 R)
• M5: 575,802 km (0.114 R)
• M6: 654,491 km (0.106 R)
• M7: 816,954 km (0.093 R)
• M8: 891,603 km (0.104 R)
• M9: 1,035,816 km (0.09 R)
• M10: 1,121,834 km (0.096 R)
• M11: 1,201,570 km (0.102 R)
• M12: 1,283,400 km (0.114 R)
• M13: 1,371,962 km (0.039 R)
• M14: 1,482,066 km (0.087 R)
• M15: 1,701,227 km (0.097 R)
• M16: 1,888,524 km (0.11 R)
• M17: 2,039,169 km (0.043 R)
• M18: 2,221,977 km (0.12 R)
• M19: 2,295,430 km (0.056 R)
• M20: 2,369,780 km (0.088 R)
• M21: 2,532,842 km (0.117 R)
• M22: 2,633,671 km (0.057 R)
• M23: 2,790,449 km (0.069 R)
• M24: 2,876,318 km (0.085 R)
• M25: 2,981,635 km (0.08 R)
• M26: 3,063,166 km (0.093 R)
• M27: 3,273,351 km (0.112 R)
• M28: 3,390,037 km (0.119 R)
• M29: 3,534,698 km (0.113 R)
• M30: 3,802,778 km (0.074 R)
• M31: 3,905,103 km (0.111 R)
• M32: 4,008,475 km (0.071 R)
• M33: 4,084,770 km (0.106 R)
• M34: 4,259,949 km (0.062 R)
• M35: 4,373,494 km (0.068 R)
• M36: 4,452,182 km (0.052 R)
• M37: 4,632,597 km (0.061 R)
• M38: 4,742,103 km (0.117 R)
• M39: 4,822,886 km (0.115 R)
• M40: 4,956,177 km (0.083 R)
• M41: 5,113,255 km (0.053 R)

Planet 3 - Gas Giant

Semi-Major Axis: 0.94 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 358.7

Radius: 9.2

Gravity: 4.24 G

Time & Orbit

Eccentricity (e): 0.043

Orbit Range: 0.9 AU - 0.98 AU

Year: 629 Days

Day: 8.7 Hours

Environment

Temp: -165 °C

Axial Tilt: 10 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (55)

Outer Limit: 32,359,453 km

• M1: 171,589 km (0.096 R)
• M2: 257,757 km (0.051 R)
• M3: 348,264 km (0.097 R)
• M4: 415,134 km (0.118 R)
• M5: 480,359 km (0.1 R)
• M6: 549,623 km (0.076 R)
• M7: 611,107 km (0.039 R)
• M8: 670,946 km (0.048 R)
• M9: 762,949 km (0.079 R)
• M10: 837,150 km (0.114 R)
• M11: 909,405 km (0.113 R)
• M12: 988,692 km (0.092 R)
• M13: 1,050,925 km (0.049 R)
• M14: 1,292,825 km (0.118 R)
• M15: 1,393,504 km (0.055 R)
• M16: 1,508,096 km (0.111 R)
• M17: 1,608,776 km (0.118 R)
• M18: 1,729,202 km (0.058 R)
• M19: 1,906,475 km (0.1 R)
• M20: 1,985,313 km (0.071 R)
• M21: 2,071,332 km (0.047 R)
• M22: 2,133,565 km (0.081 R)
• M23: 2,247,259 km (0.075 R)
• M24: 2,389,078 km (0.108 R)
• M25: 2,447,870 km (0.103 R)
• M26: 2,776,985 km (0.117 R)
• M27: 2,887,538 km (0.104 R)
• M28: 2,957,251 km (0.098 R)
• M29: 3,020,680 km (0.096 R)
• M30: 3,112,982 km (0.08 R)
• M31: 3,184,639 km (0.106 R)
• M32: 3,410,383 km (0.113 R)
• M33: 3,499,244 km (0.072 R)
• M34: 3,648,991 km (0.082 R)
• M35: 3,709,578 km (0.085 R)
• M36: 3,816,242 km (0.051 R)
• M37: 3,947,140 km (0.07 R)
• M38: 4,111,099 km (0.054 R)
• M39: 4,189,937 km (0.11 R)
• M40: 4,277,153 km (0.082 R)
• M41: 4,357,038 km (0.116 R)
• M42: 4,445,600 km (0.076 R)
• M43: 4,665,210 km (0.062 R)
• M44: 4,755,866 km (0.095 R)
• M45: 4,863,576 km (0.03 R)
• M46: 4,980,562 km (0.117 R)
• M47: 5,123,877 km (0.119 R)
• M48: 5,234,429 km (0.081 R)
• M49: 5,294,269 km (0.116 R)
• M50: 5,466,605 km (0.077 R)
• M51: 5,527,342 km (0.095 R)
• M52: 5,605,731 km (0.063 R)
• M53: 5,746,054 km (0.116 R)
• M54: 5,923,178 km (0.107 R)
• M55: 6,003,363 km (0.092 R)

Planet 4 - Gas Giant

Semi-Major Axis: 2 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 125.1

Radius: 9.6

Gravity: 1.36 G

Time & Orbit

Eccentricity (e): 0.068

Orbit Range: 1.86 AU - 2.14 AU

Year: 1952 Days

Day: 9.6 Hours

Environment

Temp: -191 °C

Axial Tilt: 8 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (66)

Outer Limit: 32,359,453 km

• M1: 120,875 km (0.098 R)
• M2: 181,013 km (0.107 R)
• M3: 262,245 km (0.102 R)
• M4: 363,224 km (0.105 R)
• M5: 448,943 km (0.104 R)
• M6: 562,488 km (0.079 R)
• M7: 633,697 km (0.111 R)
• M8: 724,802 km (0.072 R)
• M9: 838,197 km (0.116 R)
• M10: 915,240 km (0.088 R)
• M11: 976,276 km (0.114 R)
• M12: 1,089,820 km (0.104 R)
• M13: 1,234,930 km (0.111 R)
• M14: 1,296,266 km (0.062 R)
• M15: 1,372,560 km (0.117 R)
• M16: 1,479,224 km (0.084 R)
• M17: 1,581,399 km (0.074 R)
• M18: 1,746,854 km (0.117 R)
• M19: 1,831,676 km (0.037 R)
• M20: 1,949,859 km (0.049 R)
• M21: 2,013,887 km (0.095 R)
• M22: 2,260,424 km (0.071 R)
• M23: 2,327,892 km (0.114 R)
• M24: 2,534,338 km (0.116 R)
• M25: 2,657,457 km (0.071 R)
• M26: 2,746,767 km (0.087 R)
• M27: 2,846,099 km (0.095 R)
• M28: 3,020,680 km (0.102 R)
• M29: 3,085,755 km (0.098 R)
• M30: 3,227,125 km (0.115 R)
• M31: 3,293,846 km (0.087 R)
• M32: 3,409,335 km (0.109 R)
• M33: 3,584,963 km (0.103 R)
• M34: 3,924,999 km (0.107 R)
• M35: 4,129,948 km (0.096 R)
• M36: 4,212,975 km (0.115 R)
• M37: 4,465,197 km (0.094 R)
• M38: 4,593,253 km (0.033 R)
• M39: 4,679,272 km (0.109 R)
• M40: 4,973,680 km (0.077 R)
• M41: 5,073,163 km (0.054 R)
• M42: 5,162,174 km (0.075 R)
• M43: 5,319,102 km (0.113 R)
• M44: 5,477,676 km (0.061 R)
• M45: 5,672,452 km (0.117 R)
• M46: 5,811,279 km (0.051 R)
• M47: 5,892,810 km (0.079 R)
• M48: 6,056,919 km (0.106 R)
• M49: 6,127,828 km (0.12 R)
• M50: 6,210,705 km (0.104 R)
• M51: 6,667,727 km (0.102 R)
• M52: 6,789,799 km (0.111 R)
• M53: 6,851,134 km (0.069 R)
• M54: 6,949,719 km (0.042 R)
• M55: 7,036,336 km (0.094 R)
• M56: 7,185,635 km (0.104 R)
• M57: 7,386,245 km (0.073 R)
• M58: 7,474,658 km (0.053 R)
• M59: 7,741,989 km (0.096 R)
• M60: 7,934,821 km (0.06 R)
• M61: 8,103,268 km (0.118 R)
• M62: 8,220,553 km (0.079 R)
• M63: 8,312,256 km (0.086 R)
• M64: 8,575,848 km (0.119 R)
• M65: 8,668,897 km (0.063 R)
• M66: 9,057,553 km (0.118 R)

Planet 5 - Gas Giant

Semi-Major Axis: 2.76 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 225.8

Radius: 11.2

Gravity: 1.8 G

Time & Orbit

Eccentricity (e): 0.027

Orbit Range: 2.69 AU - 2.83 AU

Year: 3165 Days

Day: 12 Hours

Environment

Temp: -211 °C

Axial Tilt: 21.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (67)

Outer Limit: 32,359,453 km

• M1: 289,621 km (0.068 R)
• M2: 391,797 km (0.059 R)
• M3: 530,324 km (0.071 R)
• M4: 621,130 km (0.11 R)
• M5: 804,687 km (0.114 R)
• M6: 1,015,770 km (0.058 R)
• M7: 1,105,379 km (0.074 R)
• M8: 1,197,980 km (0.108 R)
• M9: 1,273,975 km (0.116 R)
• M10: 1,512,434 km (0.103 R)
• M11: 1,605,784 km (0.11 R)
• M12: 1,831,078 km (0.066 R)
• M13: 1,998,628 km (0.09 R)
• M14: 2,078,513 km (0.068 R)
• M15: 2,397,007 km (0.12 R)
• M16: 2,568,446 km (0.114 R)
• M17: 2,949,621 km (0.03 R)
• M18: 3,107,148 km (0.104 R)
• M19: 3,267,666 km (0.102 R)
• M20: 3,417,115 km (0.119 R)
• M21: 3,779,590 km (0.055 R)
• M22: 4,052,307 km (0.079 R)
• M23: 4,125,161 km (0.06 R)
• M24: 4,272,216 km (0.037 R)
• M25: 4,586,820 km (0.115 R)
• M26: 4,770,078 km (0.109 R)
• M27: 4,986,845 km (0.115 R)
• M28: 5,238,618 km (0.107 R)
• M29: 5,919,438 km (0.115 R)
• M30: 6,152,661 km (0.046 R)
• M31: 6,338,013 km (0.079 R)
• M32: 6,456,943 km (0.096 R)
• M33: 6,975,150 km (0.066 R)
• M34: 7,133,126 km (0.065 R)
• M35: 7,452,966 km (0.072 R)
• M36: 7,759,193 km (0.03 R)
• M37: 8,088,158 km (0.106 R)
• M38: 8,161,910 km (0.044 R)
• M39: 8,384,362 km (0.11 R)
• M40: 8,590,059 km (0.116 R)
• M41: 9,025,688 km (0.07 R)
• M42: 9,275,068 km (0.091 R)
• M43: 9,878,995 km (0.117 R)
• M44: 10,156,050 km (0.111 R)
• M45: 10,961,335 km (0.116 R)
• M46: 11,124,995 km (0.084 R)
• M47: 11,433,765 km (0.072 R)
• M48: 11,682,995 km (0.093 R)
• M49: 11,766,471 km (0.025 R)
• M50: 11,871,040 km (0.119 R)
• M51: 12,081,075 km (0.113 R)
• M52: 12,165,448 km (0.076 R)
• M53: 12,271,364 km (0.066 R)
• M54: 12,356,186 km (0.054 R)
• M55: 12,611,848 km (0.105 R)
• M56: 12,718,961 km (0.108 R)
• M57: 12,890,849 km (0.09 R)
• M58: 13,302,243 km (0.06 R)
• M59: 13,542,497 km (0.034 R)
• M60: 13,872,211 km (0.068 R)
• M61: 14,093,615 km (0.106 R)
• M62: 14,360,797 km (0.073 R)
• M63: 14,562,306 km (0.049 R)
• M64: 14,674,803 km (0.103 R)
• M65: 14,809,890 km (0.091 R)
• M66: 14,945,575 km (0.062 R)
• M67: 15,127,037 km (0.077 R)

Planet 6 - Gas Giant

Semi-Major Axis: 4.01 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 954.8

Radius: 8.9

Gravity: 12.05 G

Time & Orbit

Eccentricity (e): 0.136

Orbit Range: 3.46 AU - 4.56 AU

Year: 5543 Days

Day: 10 Hours

Environment

Temp: -227 °C

Axial Tilt: 15.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (78)

Outer Limit: 32,359,453 km

• M1: 170,392 km (0.079 R)
• M2: 288,574 km (0.077 R)
• M3: 366,964 km (0.119 R)
• M4: 588,069 km (0.068 R)
• M5: 707,598 km (0.081 R)
• M6: 1,003,353 km (0.111 R)
• M7: 1,937,143 km (0.102 R)
• M8: 2,058,467 km (0.045 R)
• M9: 2,182,334 km (0.105 R)
• M10: 2,546,754 km (0.089 R)
• M11: 2,815,582 km (0.11 R)
• M12: 3,404,997 km (0.11 R)
• M13: 4,372,147 km (0.111 R)
• M14: 4,505,439 km (0.113 R)
• M15: 4,721,458 km (0.085 R)
• M16: 5,192,093 km (0.104 R)
• M17: 5,333,314 km (0.104 R)
• M18: 5,447,307 km (0.119 R)
• M19: 5,677,538 km (0.117 R)
• M20: 5,735,732 km (0.045 R)
• M21: 5,793,926 km (0.075 R)
• M22: 5,881,739 km (0.118 R)
• M23: 5,940,531 km (0.072 R)
• M24: 6,058,714 km (0.088 R)
• M25: 6,569,740 km (0.062 R)
• M26: 7,251,458 km (0.075 R)
• M27: 7,825,913 km (0.109 R)
• M28: 8,118,676 km (0.115 R)
• M29: 8,782,143 km (0.119 R)
• M30: 9,325,482 km (0.064 R)
• M31: 9,462,963 km (0.115 R)
• M32: 9,705,311 km (0.085 R)
• M33: 9,844,737 km (0.097 R)
• M34: 10,551,587 km (0.12 R)
• M35: 11,494,951 km (0.084 R)
• M36: 11,827,806 km (0.095 R)
• M37: 12,616,636 km (0.084 R)
• M38: 13,036,706 km (0.078 R)
• M39: 13,306,431 km (0.11 R)
• M40: 13,694,787 km (0.038 R)
• M41: 13,851,267 km (0.076 R)
• M42: 14,008,345 km (0.058 R)
• M43: 14,245,008 km (0.114 R)
• M44: 14,403,433 km (0.037 R)
• M45: 14,962,929 km (0.062 R)
• M46: 15,164,437 km (0.071 R)
• M47: 15,570,146 km (0.087 R)
• M48: 15,979,446 km (0.032 R)
• M49: 17,439,970 km (0.111 R)
• M50: 17,779,707 km (0.073 R)
• M51: 18,121,688 km (0.104 R)
• M52: 18,207,557 km (0.087 R)
• M53: 18,595,464 km (0.086 R)
• M54: 20,041,178 km (0.119 R)
• M55: 20,575,691 km (0.1 R)
• M56: 21,114,991 km (0.09 R)
• M57: 21,704,557 km (0.051 R)
• M58: 22,253,581 km (0.116 R)
• M59: 22,529,739 km (0.056 R)
• M60: 22,622,040 km (0.117 R)
• M61: 22,760,867 km (0.098 R)
• M62: 23,132,169 km (0.082 R)
• M63: 23,739,836 km (0.039 R)
• M64: 24,021,977 km (0.118 R)
• M65: 27,297,572 km (0.055 R)
• M66: 28,237,496 km (0.106 R)
• M67: 28,337,128 km (0.074 R)
• M68: 28,436,760 km (0.088 R)
• M69: 29,137,776 km (0.034 R)
• M70: 30,454,835 km (0.096 R)
• M71: 31,532,688 km (0.094 R)
• M72: 32,206,178 km (0.105 R)
• M73: 32,310,148 km (0.117 R)
• M74: 32,466,478 km (0.041 R)
• M75: 32,570,748 km (0.043 R)
• M76: 35,054,072 km (0.086 R)
• M77: 35,805,652 km (0.092 R)
• M78: 35,967,367 km (0.061 R)

Planet 7 - Ice Giant

Semi-Major Axis: 7.74 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 95.4

Radius: 4.1

Gravity: 5.68 G

Time & Orbit

Eccentricity (e): 0.153

Orbit Range: 6.56 AU - 8.92 AU

Year: 14864 Days

Day: 15.9 Hours

Environment

Temp: -234 °C

Axial Tilt: 45.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (80)

Outer Limit: 32,359,453 km

• M1: 88,263 km (0.072 R)
• M2: 122,670 km (0.113 R)
• M3: 598,840 km (0.102 R)
• M4: 649,404 km (0.057 R)
• M5: 701,315 km (0.106 R)
• M6: 741,257 km (0.094 R)
• M7: 967,300 km (0.092 R)
• M8: 1,197,681 km (0.098 R)
• M9: 1,547,889 km (0.105 R)
• M10: 1,635,853 km (0.042 R)
• M11: 1,689,259 km (0.113 R)
• M12: 1,871,918 km (0.12 R)
• M13: 2,041,712 km (0.116 R)
• M14: 2,177,098 km (0.118 R)
• M15: 2,295,579 km (0.031 R)
• M16: 2,335,522 km (0.114 R)
• M17: 2,395,959 km (0.077 R)
• M18: 2,477,341 km (0.087 R)
• M19: 2,559,470 km (0.108 R)
• M20: 2,642,646 km (0.088 R)
• M21: 2,919,103 km (0.102 R)
• M22: 3,006,020 km (0.107 R)
• M23: 3,137,965 km (0.109 R)
• M24: 3,384,801 km (0.092 R)
• M25: 4,433,482 km (0.095 R)
• M26: 4,483,448 km (0.09 R)
• M27: 5,386,421 km (0.112 R)
• M28: 6,175,699 km (0.056 R)
• M29: 6,971,560 km (0.114 R)
• M30: 8,782,293 km (0.103 R)
• M31: 9,034,215 km (0.111 R)
• M32: 10,361,747 km (0.055 R)
• M33: 10,494,590 km (0.1 R)
• M34: 10,627,882 km (0.08 R)
• M35: 10,728,262 km (0.093 R)
• M36: 11,542,373 km (0.112 R)
• M37: 11,611,039 km (0.064 R)
• M38: 12,764,887 km (0.092 R)
• M39: 12,800,342 km (0.065 R)
• M40: 12,907,155 km (0.034 R)
• M41: 13,014,267 km (0.081 R)
• M42: 13,337,249 km (0.036 R)
• M43: 14,433,053 km (0.058 R)
• M44: 14,767,255 km (0.068 R)
• M45: 15,292,343 km (0.115 R)
• M46: 15,481,435 km (0.053 R)
• M47: 15,595,279 km (0.092 R)
• M48: 16,322,324 km (0.107 R)
• M49: 16,360,921 km (0.1 R)
• M50: 16,476,709 km (0.074 R)
• M51: 16,592,947 km (0.117 R)
• M52: 16,904,111 km (0.095 R)
• M53: 19,135,213 km (0.115 R)
• M54: 19,420,646 km (0.066 R)
• M55: 21,161,965 km (0.108 R)
• M56: 21,288,226 km (0.11 R)
• M57: 21,795,961 km (0.113 R)
• M58: 22,780,016 km (0.105 R)
• M59: 22,823,100 km (0.101 R)
• M60: 22,866,334 km (0.063 R)
• M61: 23,212,354 km (0.095 R)
• M62: 24,305,166 km (0.113 R)
• M63: 25,280,544 km (0.07 R)
• M64: 25,638,382 km (0.097 R)
• M65: 26,313,966 km (0.057 R)
• M66: 26,858,503 km (0.097 R)
• M67: 27,406,928 km (0.074 R)
• M68: 27,774,490 km (0.108 R)
• M69: 28,005,021 km (0.119 R)
• M70: 28,097,472 km (0.089 R)
• M71: 28,700,651 km (0.105 R)
• M72: 29,308,018 km (0.087 R)
• M73: 29,448,790 km (0.089 R)
• M74: 29,683,957 km (0.099 R)
• M75: 29,966,847 km (0.107 R)
• M76: 30,014,120 km (0.036 R)
• M77: 30,203,361 km (0.113 R)
• M78: 30,916,494 km (0.086 R)
• M79: 31,539,121 km (0.059 R)
• M80: 31,924,335 km (0.029 R)

Kuiper Belt

Range: 30 - 54 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 246 - 14,632 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit