🌌 Stone's Star System Generator

Asteroid Belt

Center: 0.41 AU

Composition

Type: Inner (Rocky/Metallic)

A dense region of planetesimals and debris.

Boundary

Planet 1 - Gas Giant

Semi-Major Axis: 0.82 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 441.6

Radius: 14.2

Gravity: 2.19 G

Time & Orbit

Eccentricity (e): 0.05

Orbit Range: 0.78 AU - 0.86 AU

Year: 495 Days

Day: 8 Hours

Environment

Temp: -172 °C

Axial Tilt: 26.3 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (36)

Outer Limit: 57,741,643 km

• M1: 190,737 km (0.104 R)
• M2: 352,752 km (0.08 R)
• M3: 456,872 km (0.099 R)
• M4: 548,875 km (0.105 R)
• M5: 678,426 km (0.049 R)
• M6: 864,676 km (0.088 R)
• M7: 977,772 km (0.098 R)
• M8: 1,105,379 km (0.068 R)
• M9: 1,210,995 km (0.089 R)
• M10: 1,368,970 km (0.119 R)
• M11: 1,554,771 km (0.08 R)
• M12: 1,648,269 km (0.087 R)
• M13: 1,738,626 km (0.116 R)
• M14: 1,879,996 km (0.086 R)
• M15: 1,980,377 km (0.084 R)
• M16: 2,088,237 km (0.098 R)
• M17: 2,250,999 km (0.103 R)
• M18: 2,376,063 km (0.095 R)
• M19: 2,521,771 km (0.111 R)
• M20: 2,752,601 km (0.12 R)
• M21: 2,841,761 km (0.118 R)
• M22: 2,957,999 km (0.099 R)
• M23: 3,088,897 km (0.095 R)
• M24: 3,356,827 km (0.027 R)
• M25: 3,688,485 km (0.107 R)
• M26: 3,872,790 km (0.081 R)
• M27: 4,009,373 km (0.029 R)
• M28: 4,169,442 km (0.083 R)
• M29: 4,257,855 km (0.104 R)
• M30: 4,391,445 km (0.11 R)
• M31: 4,662,966 km (0.09 R)
• M32: 4,754,819 km (0.081 R)
• M33: 5,025,890 km (0.108 R)
• M34: 5,310,126 km (0.114 R)
• M35: 5,470,495 km (0.056 R)
• M36: 5,567,434 km (0.09 R)

Planet 2 - Gas Giant

Semi-Major Axis: 0.87 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 356.4

Radius: 8.2

Gravity: 5.3 G

Time & Orbit

Eccentricity (e): 0.193

Orbit Range: 0.7 AU - 1.04 AU

Year: 541 Days

Day: 8 Hours

Environment

Temp: -173 °C

Axial Tilt: 34.8 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (49)

Outer Limit: 57,741,643 km

• M1: 102,923 km (0.074 R)
• M2: 162,463 km (0.074 R)
• M3: 219,909 km (0.085 R)
• M4: 341,233 km (0.119 R)
• M5: 403,914 km (0.112 R)
• M6: 491,579 km (0.047 R)
• M7: 634,145 km (0.063 R)
• M8: 691,292 km (0.114 R)
• M9: 774,618 km (0.101 R)
• M10: 874,100 km (0.113 R)
• M11: 951,742 km (0.04 R)
• M12: 1,027,289 km (0.034 R)
• M13: 1,086,529 km (0.071 R)
• M14: 1,137,542 km (0.116 R)
• M15: 1,415,345 km (0.065 R)
• M16: 1,512,734 km (0.078 R)
• M17: 1,639,144 km (0.037 R)
• M18: 1,801,906 km (0.107 R)
• M19: 1,907,971 km (0.07 R)
• M20: 1,975,889 km (0.068 R)
• M21: 2,027,500 km (0.042 R)
• M22: 2,096,913 km (0.109 R)
• M23: 2,208,513 km (0.119 R)
• M24: 2,334,325 km (0.088 R)
• M25: 2,419,446 km (0.082 R)
• M26: 2,518,031 km (0.091 R)
• M27: 2,574,131 km (0.088 R)
• M28: 2,649,528 km (0.06 R)
• M29: 2,802,567 km (0.086 R)
• M30: 2,880,208 km (0.105 R)
• M31: 2,978,344 km (0.056 R)
• M32: 3,191,371 km (0.077 R)
• M33: 3,437,011 km (0.038 R)
• M34: 3,527,219 km (0.111 R)
• M35: 3,583,019 km (0.09 R)
• M36: 3,688,784 km (0.102 R)
• M37: 3,745,482 km (0.111 R)
• M38: 3,802,628 km (0.034 R)
• M39: 3,881,616 km (0.112 R)
• M40: 4,158,522 km (0.073 R)
• M41: 4,540,445 km (0.072 R)
• M42: 4,639,628 km (0.071 R)
• M43: 4,770,526 km (0.109 R)
• M44: 4,832,460 km (0.11 R)
• M45: 4,980,712 km (0.115 R)
• M46: 5,059,400 km (0.118 R)
• M47: 5,122,530 km (0.111 R)
• M48: 5,201,967 km (0.067 R)
• M49: 5,369,965 km (0.059 R)

Planet 3 - Gas Giant

Semi-Major Axis: 0.9 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 946.6

Radius: 11.2

Gravity: 7.55 G

Time & Orbit

Eccentricity (e): 0.091

Orbit Range: 0.82 AU - 0.98 AU

Year: 569 Days

Day: 12.5 Hours

Environment

Temp: -167 °C

Axial Tilt: 33.4 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (52)

Outer Limit: 57,741,643 km

• M1: 139,575 km (0.119 R)
• M2: 242,199 km (0.057 R)
• M3: 348,862 km (0.043 R)
• M4: 494,720 km (0.116 R)
• M5: 645,365 km (0.059 R)
• M6: 766,988 km (0.117 R)
• M7: 849,267 km (0.094 R)
• M8: 1,069,176 km (0.106 R)
• M9: 1,210,247 km (0.11 R)
• M10: 1,301,801 km (0.099 R)
• M11: 1,408,464 km (0.04 R)
• M12: 1,479,074 km (0.113 R)
• M13: 1,664,576 km (0.092 R)
• M14: 1,872,217 km (0.071 R)
• M15: 1,950,457 km (0.089 R)
• M16: 2,051,735 km (0.07 R)
• M17: 2,229,607 km (0.094 R)
• M18: 2,343,301 km (0.057 R)
• M19: 2,443,532 km (0.101 R)
• M20: 2,537,479 km (0.08 R)
• M21: 2,826,353 km (0.086 R)
• M22: 2,941,543 km (0.106 R)
• M23: 3,050,001 km (0.045 R)
• M24: 3,236,700 km (0.079 R)
• M25: 3,314,191 km (0.119 R)
• M26: 3,427,138 km (0.118 R)
• M27: 3,603,663 km (0.072 R)
• M28: 3,746,978 km (0.079 R)
• M29: 3,928,739 km (0.057 R)
• M30: 4,085,667 km (0.115 R)
• M31: 4,225,990 km (0.075 R)
• M32: 4,415,381 km (0.12 R)
• M33: 4,540,146 km (0.119 R)
• M34: 4,665,958 km (0.098 R)
• M35: 4,744,048 km (0.062 R)
• M36: 4,901,425 km (0.094 R)
• M37: 5,000,758 km (0.038 R)
• M38: 5,070,620 km (0.118 R)
• M39: 5,181,173 km (0.099 R)
• M40: 5,714,489 km (0.098 R)
• M41: 5,850,623 km (0.081 R)
• M42: 6,030,141 km (0.098 R)
• M43: 6,351,626 km (0.105 R)
• M44: 6,481,777 km (0.092 R)
• M45: 6,558,221 km (0.111 R)
• M46: 6,689,718 km (0.114 R)
• M47: 6,811,191 km (0.047 R)
• M48: 6,977,993 km (0.032 R)
• M49: 7,056,232 km (0.109 R)
• M50: 7,349,594 km (0.066 R)
• M51: 7,429,180 km (0.108 R)
• M52: 7,600,918 km (0.089 R)

Planet 4 - Gas Giant

Semi-Major Axis: 1.59 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 17

Radius: 8.8

Gravity: 0.22 G

Time & Orbit

Eccentricity (e): 0.086

Orbit Range: 1.45 AU - 1.73 AU

Year: 1337 Days

Day: 10 Hours

Environment

Temp: -195 °C

Axial Tilt: 35.1 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (25)

Outer Limit: 57,741,643 km

• M1: 114,742 km (0.104 R)
• M2: 176,525 km (0.087 R)
• M3: 566,078 km (0.084 R)
• M4: 677,678 km (0.083 R)
• M5: 739,313 km (0.083 R)
• M6: 812,466 km (0.118 R)
• M7: 904,319 km (0.11 R)
• M8: 1,281,455 km (0.113 R)
• M9: 1,404,874 km (0.034 R)
• M10: 1,520,513 km (0.11 R)
• M11: 1,583,643 km (0.103 R)
• M12: 1,716,486 km (0.069 R)
• M13: 1,807,292 km (0.105 R)
• M14: 1,887,028 km (0.07 R)
• M15: 1,946,418 km (0.114 R)
• M16: 2,426,627 km (0.054 R)
• M17: 2,656,409 km (0.078 R)
• M18: 2,800,622 km (0.106 R)
• M19: 2,883,649 km (0.102 R)
• M20: 2,987,170 km (0.04 R)
• M21: 3,071,992 km (0.079 R)
• M22: 3,295,043 km (0.096 R)
• M23: 3,367,149 km (0.071 R)
• M24: 3,424,295 km (0.086 R)
• M25: 3,534,100 km (0.095 R)

Asteroid Belt

Center: 2.31 AU

Composition

Type: Outer System (Icy)

A dense region of planetesimals and debris.

Boundary

Planet 5 - Gas Giant

Semi-Major Axis: 3.03 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 810.9

Radius: 8.1

Gravity: 12.36 G

Time & Orbit

Eccentricity (e): 0.079

Orbit Range: 2.79 AU - 3.27 AU

Year: 3517 Days

Day: 8.8 Hours

Environment

Temp: -207 °C

Axial Tilt: 20.1 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (85)

Outer Limit: 57,741,643 km

• M1: 166,652 km (0.116 R)
• M2: 860,936 km (0.112 R)
• M3: 932,593 km (0.099 R)
• M4: 993,928 km (0.051 R)
• M5: 1,186,311 km (0.102 R)
• M6: 1,390,811 km (0.086 R)
• M7: 1,548,039 km (0.085 R)
• M8: 1,666,221 km (0.105 R)
• M9: 1,802,654 km (0.117 R)
• M10: 1,958,835 km (0.114 R)
• M11: 2,201,333 km (0.111 R)
• M12: 2,301,114 km (0.058 R)
• M13: 2,750,656 km (0.066 R)
• M14: 3,077,976 km (0.093 R)
• M15: 3,208,575 km (0.095 R)
• M16: 3,265,123 km (0.079 R)
• M17: 3,398,415 km (0.109 R)
• M18: 3,591,994 km (0.098 R)
• M19: 3,769,418 km (0.049 R)
• M20: 3,849,153 km (0.099 R)
• M21: 4,030,615 km (0.115 R)
• M22: 4,091,801 km (0.098 R)
• M23: 4,194,425 km (0.095 R)
• M24: 4,277,153 km (0.11 R)
• M25: 4,892,898 km (0.111 R)
• M26: 4,958,122 km (0.105 R)
• M27: 5,023,796 km (0.078 R)
• M28: 5,244,453 km (0.086 R)
• M29: 5,445,961 km (0.1 R)
• M30: 5,581,646 km (0.089 R)
• M31: 5,718,379 km (0.098 R)
• M32: 5,810,232 km (0.113 R)
• M33: 6,159,094 km (0.084 R)
• M34: 6,610,580 km (0.06 R)
• M35: 7,072,987 km (0.078 R)
• M36: 7,171,572 km (0.11 R)
• M37: 7,295,589 km (0.108 R)
• M38: 7,495,452 km (0.12 R)
• M39: 7,747,823 km (0.04 R)
• M40: 7,824,118 km (0.093 R)
• M41: 8,028,619 km (0.086 R)
• M42: 8,234,914 km (0.116 R)
• M43: 8,653,040 km (0.103 R)
• M44: 8,732,177 km (0.097 R)
• M45: 9,401,029 km (0.102 R)
• M46: 9,509,637 km (0.092 R)
• M47: 10,197,488 km (0.088 R)
• M48: 10,618,008 km (0.113 R)
• M49: 11,015,639 km (0.075 R)
• M50: 11,130,082 km (0.074 R)
• M51: 11,187,527 km (0.077 R)
• M52: 11,650,233 km (0.046 R)
• M53: 11,766,920 km (0.098 R)
• M54: 11,972,018 km (0.072 R)
• M55: 12,030,810 km (0.052 R)
• M56: 12,119,223 km (0.09 R)
• M57: 12,534,656 km (0.044 R)
• M58: 12,744,093 km (0.071 R)
• M59: 13,501,657 km (0.114 R)
• M60: 13,624,177 km (0.117 R)
• M61: 13,747,147 km (0.095 R)
• M62: 13,870,415 km (0.115 R)
• M63: 14,461,177 km (0.12 R)
• M64: 14,649,521 km (0.117 R)
• M65: 14,965,023 km (0.079 R)
• M66: 15,731,562 km (0.091 R)
• M67: 15,860,665 km (0.11 R)
• M68: 16,249,770 km (0.082 R)
• M69: 16,478,205 km (0.051 R)
• M70: 17,269,429 km (0.092 R)
• M71: 18,073,218 km (0.042 R)
• M72: 18,547,593 km (0.1 R)
• M73: 18,923,233 km (0.077 R)
• M74: 19,060,414 km (0.103 R)
• M75: 19,439,495 km (0.075 R)
• M76: 20,909,743 km (0.116 R)
• M77: 21,265,038 km (0.104 R)
• M78: 21,801,646 km (0.107 R)
• M79: 21,981,612 km (0.085 R)
• M80: 22,961,478 km (0.095 R)
• M81: 23,181,237 km (0.072 R)
• M82: 23,511,998 km (0.114 R)
• M83: 23,733,553 km (0.069 R)
• M84: 24,104,107 km (0.105 R)
• M85: 24,401,956 km (0.107 R)

Planet 6 - Gas Giant

Semi-Major Axis: 4.53 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 716.1

Radius: 12.6

Gravity: 4.51 G

Time & Orbit

Eccentricity (e): 0.205

Orbit Range: 3.6 AU - 5.46 AU

Year: 6429 Days

Day: 6.2 Hours

Environment

Temp: -217 °C

Axial Tilt: 20.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (81)

Outer Limit: 57,741,643 km

• M1: 169,494 km (0.075 R)
• M2: 308,022 km (0.108 R)
• M3: 512,672 km (0.073 R)
• M4: 634,893 km (0.095 R)
• M5: 824,883 km (0.082 R)
• M6: 957,875 km (0.075 R)
• M7: 1,130,960 km (0.116 R)
• M8: 1,732,194 km (0.079 R)
• M9: 2,401,345 km (0.092 R)
• M10: 2,531,196 km (0.114 R)
• M11: 2,708,170 km (0.101 R)
• M12: 3,098,022 km (0.116 R)
• M13: 3,905,402 km (0.079 R)
• M14: 4,084,919 km (0.11 R)
• M15: 4,586,072 km (0.08 R)
• M16: 4,694,082 km (0.118 R)
• M17: 4,830,366 km (0.097 R)
• M18: 4,912,794 km (0.115 R)
• M19: 5,078,997 km (0.119 R)
• M20: 5,417,088 km (0.108 R)
• M21: 5,617,699 km (0.096 R)
• M22: 6,115,262 km (0.073 R)
• M23: 6,294,330 km (0.081 R)
• M24: 7,121,607 km (0.106 R)
• M25: 7,564,117 km (0.102 R)
• M26: 9,319,199 km (0.113 R)
• M27: 9,664,022 km (0.103 R)
• M28: 10,013,184 km (0.062 R)
• M29: 10,153,955 km (0.116 R)
• M30: 11,820,177 km (0.051 R)
• M31: 12,081,225 km (0.078 R)
• M32: 12,495,162 km (0.101 R)
• M33: 12,952,034 km (0.098 R)
• M34: 13,414,591 km (0.119 R)
• M35: 13,530,978 km (0.096 R)
• M36: 13,843,189 km (0.091 R)
• M37: 14,000,266 km (0.105 R)
• M38: 14,474,940 km (0.025 R)
• M39: 14,794,182 km (0.049 R)
• M40: 15,889,239 km (0.077 R)
• M41: 16,094,936 km (0.105 R)
• M42: 16,384,258 km (0.111 R)
• M43: 16,675,375 km (0.071 R)
• M44: 16,842,626 km (0.114 R)
• M45: 16,968,288 km (0.039 R)
• M46: 17,262,846 km (0.118 R)
• M47: 17,347,369 km (0.102 R)
• M48: 17,516,714 km (0.114 R)
• M49: 17,686,657 km (0.081 R)
• M50: 17,857,049 km (0.105 R)
• M51: 18,113,759 km (0.111 R)
• M52: 19,153,015 km (0.072 R)
• M53: 19,371,877 km (0.039 R)
• M54: 19,989,417 km (0.076 R)
• M55: 20,122,559 km (0.099 R)
• M56: 20,882,666 km (0.066 R)
• M57: 22,569,382 km (0.118 R)
• M58: 22,708,059 km (0.118 R)
• M59: 23,219,086 km (0.061 R)
• M60: 23,921,896 km (0.077 R)
• M61: 25,013,213 km (0.097 R)
• M62: 25,300,441 km (0.091 R)
• M63: 25,540,844 km (0.097 R)
• M64: 25,878,487 km (0.052 R)
• M65: 28,184,089 km (0.04 R)
• M66: 28,833,344 km (0.07 R)
• M67: 29,386,557 km (0.114 R)
• M68: 29,689,792 km (0.097 R)
• M69: 29,892,497 km (0.11 R)
• M70: 29,994,074 km (0.106 R)
• M71: 30,401,429 km (0.104 R)
• M72: 30,605,780 km (0.043 R)
• M73: 30,861,891 km (0.053 R)
• M74: 31,841,458 km (0.09 R)
• M75: 31,945,279 km (0.051 R)
• M76: 32,049,100 km (0.1 R)
• M77: 32,988,574 km (0.097 R)
• M78: 33,093,443 km (0.1 R)
• M79: 33,303,777 km (0.11 R)
• M80: 34,574,461 km (0.028 R)
• M81: 34,894,601 km (0.094 R)

Planet 7 - Ice Giant

Semi-Major Axis: 7.16 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 733.6

Radius: 5.3

Gravity: 26.12 G

Time & Orbit

Eccentricity (e): 0.086

Orbit Range: 6.54 AU - 7.78 AU

Year: 12776 Days

Day: 22.8 Hours

Environment

Temp: -223 °C

Axial Tilt: 6.3 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (92)

Outer Limit: 57,741,643 km

• M1: 80,484 km (0.109 R)
• M2: 151,393 km (0.092 R)
• M3: 365,617 km (0.118 R)
• M4: 476,469 km (0.114 R)
• M5: 527,332 km (0.074 R)
• M6: 809,923 km (0.103 R)
• M7: 1,370,915 km (0.116 R)
• M8: 1,675,347 km (0.097 R)
• M9: 2,227,662 km (0.08 R)
• M10: 2,800,622 km (0.111 R)
• M11: 2,926,733 km (0.091 R)
• M12: 3,217,551 km (0.105 R)
• M13: 3,450,176 km (0.055 R)
• M14: 3,896,426 km (0.096 R)
• M15: 4,216,117 km (0.085 R)
• M16: 4,433,782 km (0.089 R)
• M17: 4,544,035 km (0.067 R)
• M18: 4,655,187 km (0.078 R)
• M19: 5,419,183 km (0.097 R)
• M20: 5,976,884 km (0.11 R)
• M21: 6,762,572 km (0.033 R)
• M22: 7,318,627 km (0.113 R)
• M23: 7,580,274 km (0.109 R)
• M24: 9,073,111 km (0.085 R)
• M25: 10,457,490 km (0.082 R)
• M26: 10,999,483 km (0.112 R)
• M27: 11,099,115 km (0.095 R)
• M28: 11,249,012 km (0.064 R)
• M29: 11,804,319 km (0.043 R)
• M30: 12,471,974 km (0.083 R)
• M31: 12,575,795 km (0.112 R)
• M32: 14,167,218 km (0.118 R)
• M33: 15,820,872 km (0.066 R)
• M34: 16,215,362 km (0.094 R)
• M35: 16,727,436 km (0.083 R)
• M36: 17,360,534 km (0.112 R)
• M37: 17,767,440 km (0.073 R)
• M38: 17,884,276 km (0.047 R)
• M39: 18,177,488 km (0.073 R)
• M40: 18,531,436 km (0.08 R)
• M41: 19,306,204 km (0.103 R)
• M42: 19,909,233 km (0.093 R)
• M43: 20,152,329 km (0.113 R)
• M44: 20,457,359 km (0.071 R)
• M45: 21,133,990 km (0.047 R)
• M46: 21,381,874 km (0.105 R)
• M47: 21,443,957 km (0.094 R)
• M48: 21,755,420 km (0.091 R)
• M49: 21,817,952 km (0.088 R)
• M50: 22,068,379 km (0.09 R)
• M51: 22,825,643 km (0.096 R)
• M52: 23,016,231 km (0.076 R)
• M53: 24,430,379 km (0.088 R)
• M54: 25,344,722 km (0.086 R)
• M55: 25,872,353 km (0.025 R)
• M56: 26,004,747 km (0.109 R)
• M57: 26,938,238 km (0.074 R)
• M58: 27,005,258 km (0.089 R)
• M59: 27,139,597 km (0.053 R)
• M60: 27,409,023 km (0.076 R)
• M61: 27,544,110 km (0.108 R)
• M62: 27,950,567 km (0.04 R)
• M63: 28,563,769 km (0.104 R)
• M64: 29,803,785 km (0.116 R)
• M65: 30,151,301 km (0.06 R)
• M66: 30,710,199 km (0.062 R)
• M67: 33,123,213 km (0.057 R)
• M68: 33,627,507 km (0.119 R)
• M69: 37,078,730 km (0.115 R)
• M70: 37,153,379 km (0.092 R)
• M71: 37,228,178 km (0.107 R)
• M72: 37,977,813 km (0.117 R)
• M73: 39,035,769 km (0.103 R)
• M74: 39,873,816 km (0.06 R)
• M75: 40,563,911 km (0.107 R)
• M76: 40,640,805 km (0.11 R)
• M77: 40,871,933 km (0.084 R)
• M78: 41,026,169 km (0.094 R)
• M79: 41,412,730 km (0.081 R)
• M80: 42,345,323 km (0.117 R)
• M81: 43,363,486 km (0.092 R)
• M82: 44,865,897 km (0.091 R)
• M83: 45,264,127 km (0.103 R)
• M84: 45,423,748 km (0.046 R)
• M85: 46,064,176 km (0.105 R)
• M86: 48,655,211 km (0.116 R)
• M87: 49,228,321 km (0.107 R)
• M88: 51,293,220 km (0.1 R)
• M89: 52,378,104 km (0.087 R)
• M90: 53,049,499 km (0.064 R)
• M91: 54,570,461 km (0.107 R)
• M92: 57,655,169 km (0.08 R)

Kuiper Belt

Range: 30 - 49 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 208 - 15,995 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit