🌌 Stone's Star System Generator

Asteroid Belt

Center: 0.36 AU

Composition

Type: Inner (Rocky/Metallic)

A dense region of planetesimals and debris.

Boundary

Planet 1 - Gas Giant

Semi-Major Axis: 0.71 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 344.3

Radius: 8.6

Gravity: 4.66 G

Time & Orbit

Eccentricity (e): 0.23

Orbit Range: 0.55 AU - 0.87 AU

Year: 386 Days

Day: 6.6 Hours

Environment

Temp: -141 °C

Axial Tilt: 21.4 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (42)

Outer Limit: 41,534,965 km

• M1: 134,788 km (0.098 R)
• M2: 217,814 km (0.117 R)
• M3: 290,220 km (0.082 R)
• M4: 394,190 km (0.071 R)
• M5: 447,746 km (0.06 R)
• M6: 504,145 km (0.093 R)
• M7: 581,637 km (0.115 R)
• M8: 670,198 km (0.111 R)
• M9: 766,988 km (0.096 R)
• M10: 868,715 km (0.059 R)
• M11: 949,198 km (0.083 R)
• M12: 1,016,817 km (0.115 R)
• M13: 1,149,510 km (0.11 R)
• M14: 1,338,303 km (0.065 R)
• M15: 1,573,022 km (0.052 R)
• M16: 1,699,881 km (0.083 R)
• M17: 1,760,019 km (0.083 R)
• M18: 1,853,817 km (0.036 R)
• M19: 1,968,858 km (0.113 R)
• M20: 2,051,735 km (0.107 R)
• M21: 2,115,912 km (0.098 R)
• M22: 2,180,838 km (0.093 R)
• M23: 2,353,623 km (0.056 R)
• M24: 2,410,620 km (0.12 R)
• M25: 2,489,009 km (0.073 R)
• M26: 2,751,105 km (0.11 R)
• M27: 2,838,620 km (0.05 R)
• M28: 2,893,821 km (0.051 R)
• M29: 2,977,147 km (0.073 R)
• M30: 3,055,836 km (0.068 R)
• M31: 3,152,326 km (0.028 R)
• M32: 3,209,473 km (0.09 R)
• M33: 3,336,631 km (0.06 R)
• M34: 3,483,087 km (0.114 R)
• M35: 3,542,328 km (0.053 R)
• M36: 3,764,182 km (0.087 R)
• M37: 3,910,638 km (0.076 R)
• M38: 3,972,272 km (0.101 R)
• M39: 4,046,622 km (0.109 R)
• M40: 4,158,970 km (0.077 R)
• M41: 4,259,799 km (0.108 R)
• M42: 4,316,796 km (0.06 R)

Planet 2 - Gas Giant

Semi-Major Axis: 0.94 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 790.2

Radius: 11

Gravity: 6.53 G

Time & Orbit

Eccentricity (e): 0.123

Orbit Range: 0.82 AU - 1.06 AU

Year: 588 Days

Day: 14.9 Hours

Environment

Temp: -149 °C

Axial Tilt: 11.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (51)

Outer Limit: 41,534,965 km

• M1: 201,060 km (0.117 R)
• M2: 312,211 km (0.106 R)
• M3: 383,719 km (0.094 R)
• M4: 466,895 km (0.086 R)
• M5: 570,716 km (0.084 R)
• M6: 669,600 km (0.08 R)
• M7: 740,809 km (0.099 R)
• M8: 835,055 km (0.057 R)
• M9: 917,933 km (0.12 R)
• M10: 1,020,407 km (0.115 R)
• M11: 1,190,500 km (0.045 R)
• M12: 1,425,817 km (0.111 R)
• M13: 1,501,514 km (0.116 R)
• M14: 1,591,422 km (0.054 R)
• M15: 1,676,693 km (0.085 R)
• M16: 1,763,460 km (0.119 R)
• M17: 1,844,991 km (0.105 R)
• M18: 1,913,955 km (0.088 R)
• M19: 2,206,120 km (0.092 R)
• M20: 2,331,483 km (0.108 R)
• M21: 2,482,128 km (0.07 R)
• M22: 2,722,083 km (0.119 R)
• M23: 2,793,142 km (0.095 R)
• M24: 2,880,956 km (0.042 R)
• M25: 2,953,511 km (0.032 R)
• M26: 3,224,732 km (0.085 R)
• M27: 3,367,747 km (0.109 R)
• M28: 3,452,868 km (0.108 R)
• M29: 3,695,067 km (0.079 R)
• M30: 3,809,360 km (0.071 R)
• M31: 3,898,072 km (0.035 R)
• M32: 4,032,560 km (0.072 R)
• M33: 4,132,192 km (0.108 R)
• M34: 4,278,649 km (0.111 R)
• M35: 4,352,550 km (0.086 R)
• M36: 4,548,374 km (0.105 R)
• M37: 4,958,721 km (0.069 R)
• M38: 5,470,794 km (0.097 R)
• M39: 5,662,279 km (0.118 R)
• M40: 5,825,191 km (0.082 R)
• M41: 6,031,038 km (0.1 R)
• M42: 6,239,278 km (0.028 R)
• M43: 6,439,291 km (0.109 R)
• M44: 6,513,641 km (0.119 R)
• M45: 6,662,940 km (0.068 R)
• M46: 6,770,351 km (0.098 R)
• M47: 6,932,515 km (0.071 R)
• M48: 7,019,581 km (0.101 R)
• M49: 7,315,934 km (0.084 R)
• M50: 7,482,437 km (0.112 R)
• M51: 7,560,676 km (0.091 R)

Planet 3 - Gas Giant

Semi-Major Axis: 0.96 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 37.7

Radius: 12.3

Gravity: 0.25 G

Time & Orbit

Eccentricity (e): 0.147

Orbit Range: 0.82 AU - 1.1 AU

Year: 607 Days

Day: 13.1 Hours

Environment

Temp: -158 °C

Axial Tilt: 119.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (17)

Outer Limit: 41,534,965 km

• M1: 159,920 km (0.053 R)
• M2: 242,349 km (0.064 R)
• M3: 321,935 km (0.092 R)
• M4: 450,738 km (0.089 R)
• M5: 547,678 km (0.092 R)
• M6: 723,605 km (0.084 R)
• M7: 909,405 km (0.119 R)
• M8: 1,038,957 km (0.058 R)
• M9: 1,263,354 km (0.068 R)
• M10: 1,397,394 km (0.047 R)
• M11: 1,533,079 km (0.086 R)
• M12: 1,914,554 km (0.112 R)
• M13: 2,113,070 km (0.095 R)
• M14: 2,229,756 km (0.113 R)
• M15: 2,333,577 km (0.101 R)
• M16: 2,439,044 km (0.077 R)
• M17: 2,627,537 km (0.044 R)

Planet 4 - Gas Giant

Semi-Major Axis: 1.54 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 76.7

Radius: 10.1

Gravity: 0.75 G

Time & Orbit

Eccentricity (e): 0.069

Orbit Range: 1.43 AU - 1.65 AU

Year: 1234 Days

Day: 7.7 Hours

Environment

Temp: -189 °C

Axial Tilt: 18 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (37)

Outer Limit: 41,534,965 km

• M1: 133,890 km (0.054 R)
• M2: 220,507 km (0.079 R)
• M3: 349,760 km (0.087 R)
• M4: 415,882 km (0.039 R)
• M5: 504,444 km (0.104 R)
• M6: 589,416 km (0.078 R)
• M7: 687,851 km (0.1 R)
• M8: 763,697 km (0.076 R)
• M9: 846,724 km (0.103 R)
• M10: 1,106,276 km (0.119 R)
• M11: 1,206,656 km (0.076 R)
• M12: 1,416,841 km (0.099 R)
• M13: 1,484,460 km (0.046 R)
• M14: 1,569,132 km (0.113 R)
• M15: 1,682,826 km (0.086 R)
• M16: 1,754,633 km (0.111 R)
• M17: 1,947,465 km (0.083 R)
• M18: 2,046,648 km (0.102 R)
• M19: 2,159,445 km (0.108 R)
• M20: 2,305,004 km (0.051 R)
• M21: 2,441,288 km (0.088 R)
• M22: 2,504,119 km (0.064 R)
• M23: 2,599,413 km (0.059 R)
• M24: 2,676,605 km (0.104 R)
• M25: 2,807,054 km (0.109 R)
• M26: 2,993,154 km (0.031 R)
• M27: 3,217,701 km (0.071 R)
• M28: 3,433,870 km (0.108 R)
• M29: 3,748,773 km (0.047 R)
• M30: 3,998,601 km (0.115 R)
• M31: 4,468,189 km (0.094 R)
• M32: 4,654,738 km (0.1 R)
• M33: 4,788,478 km (0.109 R)
• M34: 5,108,019 km (0.074 R)
• M35: 5,286,938 km (0.062 R)
• M36: 5,410,057 km (0.073 R)
• M37: 5,476,030 km (0.067 R)

Planet 5 - Gas Giant

Semi-Major Axis: 2.19 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 707.2

Radius: 8.1

Gravity: 10.78 G

Time & Orbit

Eccentricity (e): 0.191

Orbit Range: 1.77 AU - 2.61 AU

Year: 2093 Days

Day: 12.4 Hours

Environment

Temp: -203 °C

Axial Tilt: 18.8 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (77)

Outer Limit: 41,534,965 km

• M1: 106,663 km (0.077 R)
• M2: 176,077 km (0.085 R)
• M3: 231,428 km (0.084 R)
• M4: 382,073 km (0.046 R)
• M5: 449,392 km (0.114 R)
• M6: 1,311,525 km (0.117 R)
• M7: 1,364,781 km (0.065 R)
• M8: 1,440,478 km (0.108 R)
• M9: 1,528,890 km (0.066 R)
• M10: 1,676,244 km (0.071 R)
• M11: 1,769,444 km (0.114 R)
• M12: 1,852,321 km (0.101 R)
• M13: 1,912,459 km (0.106 R)
• M14: 2,121,597 km (0.077 R)
• M15: 2,273,738 km (0.101 R)
• M16: 2,468,963 km (0.083 R)
• M17: 2,629,183 km (0.119 R)
• M18: 2,696,950 km (0.064 R)
• M19: 2,876,019 km (0.117 R)
• M20: 3,030,554 km (0.082 R)
• M21: 3,130,335 km (0.117 R)
• M22: 3,245,825 km (0.039 R)
• M23: 3,525,573 km (0.074 R)
• M24: 3,706,287 km (0.117 R)
• M25: 3,813,250 km (0.052 R)
• M26: 3,921,110 km (0.08 R)
• M27: 4,443,356 km (0.12 R)
• M28: 4,737,615 km (0.119 R)
• M29: 4,803,887 km (0.085 R)
• M30: 4,920,573 km (0.116 R)
• M31: 5,021,253 km (0.114 R)
• M32: 5,190,747 km (0.081 R)
• M33: 5,362,186 km (0.061 R)
• M34: 5,657,791 km (0.052 R)
• M35: 5,816,515 km (0.098 R)
• M36: 5,958,782 km (0.12 R)
• M37: 6,156,252 km (0.037 R)
• M38: 6,539,372 km (0.109 R)
• M39: 6,743,274 km (0.037 R)
• M40: 6,855,322 km (0.1 R)
• M41: 6,986,819 km (0.068 R)
• M42: 7,773,853 km (0.081 R)
• M43: 7,930,782 km (0.1 R)
• M44: 8,629,404 km (0.113 R)
• M45: 8,812,212 km (0.071 R)
• M46: 8,914,238 km (0.094 R)
• M47: 9,119,785 km (0.12 R)
• M48: 9,368,267 km (0.116 R)
• M49: 9,682,273 km (0.101 R)
• M50: 9,829,926 km (0.077 R)
• M51: 9,935,842 km (0.105 R)
• M52: 10,084,841 km (0.106 R)
• M53: 10,579,412 km (0.114 R)
• M54: 10,797,077 km (0.11 R)
• M55: 11,771,707 km (0.093 R)
• M56: 12,201,352 km (0.079 R)
• M57: 12,567,119 km (0.114 R)
• M58: 12,774,312 km (0.089 R)
• M59: 12,866,913 km (0.098 R)
• M60: 12,959,664 km (0.071 R)
• M61: 13,403,072 km (0.106 R)
• M62: 13,473,682 km (0.106 R)
• M63: 13,804,144 km (0.115 R)
• M64: 13,994,282 km (0.114 R)
• M65: 14,281,062 km (0.108 R)
• M66: 14,353,168 km (0.066 R)
• M67: 15,006,611 km (0.102 R)
• M68: 15,201,986 km (0.093 R)
• M69: 15,275,588 km (0.105 R)
• M70: 15,570,894 km (0.083 R)
• M71: 15,644,945 km (0.105 R)
• M72: 15,719,146 km (0.11 R)
• M73: 15,867,996 km (0.096 R)
• M74: 16,167,042 km (0.097 R)
• M75: 16,292,255 km (0.077 R)
• M76: 16,872,097 km (0.075 R)
• M77: 16,973,674 km (0.082 R)

Planet 6 - Gas Giant

Semi-Major Axis: 4.68 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 297.4

Radius: 8.6

Gravity: 4.02 G

Time & Orbit

Eccentricity (e): 0.224

Orbit Range: 3.63 AU - 5.73 AU

Year: 6537 Days

Day: 9.6 Hours

Environment

Temp: -223 °C

Axial Tilt: 37.7 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (59)

Outer Limit: 41,534,965 km

• M1: 172,786 km (0.066 R)
• M2: 227,838 km (0.083 R)
• M3: 497,263 km (0.108 R)
• M4: 769,980 km (0.073 R)
• M5: 1,073,514 km (0.079 R)
• M6: 1,155,045 km (0.047 R)
• M7: 1,503,010 km (0.107 R)
• M8: 1,768,696 km (0.078 R)
• M9: 2,015,682 km (0.098 R)
• M10: 2,506,213 km (0.107 R)
• M11: 2,652,969 km (0.06 R)
• M12: 2,783,867 km (0.115 R)
• M13: 2,993,902 km (0.09 R)
• M14: 3,228,920 km (0.065 R)
• M15: 3,368,944 km (0.119 R)
• M16: 4,012,664 km (0.11 R)
• M17: 4,425,853 km (0.098 R)
• M18: 4,990,286 km (0.095 R)
• M19: 5,105,925 km (0.106 R)
• M20: 5,387,019 km (0.056 R)
• M21: 6,360,303 km (0.092 R)
• M22: 6,485,816 km (0.097 R)
• M23: 6,688,371 km (0.118 R)
• M24: 6,841,559 km (0.096 R)
• M25: 6,970,214 km (0.057 R)
• M26: 7,073,735 km (0.119 R)
• M27: 8,163,406 km (0.096 R)
• M28: 8,519,898 km (0.085 R)
• M29: 8,741,752 km (0.077 R)
• M30: 8,853,352 km (0.081 R)
• M31: 8,965,550 km (0.097 R)
• M32: 9,908,465 km (0.109 R)
• M33: 10,822,957 km (0.037 R)
• M34: 11,305,410 km (0.113 R)
• M35: 11,396,665 km (0.069 R)
• M36: 13,497,617 km (0.092 R)
• M37: 13,853,810 km (0.113 R)
• M38: 14,708,014 km (0.065 R)
• M39: 15,343,057 km (0.114 R)
• M40: 17,126,413 km (0.093 R)
• M41: 17,336,448 km (0.085 R)
• M42: 17,652,998 km (0.063 R)
• M43: 17,971,491 km (0.077 R)
• M44: 18,149,214 km (0.099 R)
• M45: 19,482,729 km (0.043 R)
• M46: 19,592,235 km (0.102 R)
• M47: 20,364,459 km (0.069 R)
• M48: 20,475,610 km (0.102 R)
• M49: 20,698,511 km (0.1 R)
• M50: 21,371,851 km (0.075 R)
• M51: 21,824,833 km (0.113 R)
• M52: 22,586,885 km (0.088 R)
• M53: 22,855,563 km (0.098 R)
• M54: 23,164,033 km (0.091 R)
• M55: 23,629,283 km (0.097 R)
• M56: 24,451,024 km (0.09 R)
• M57: 25,123,018 km (0.077 R)
• M58: 25,401,419 km (0.089 R)
• M59: 26,001,606 km (0.093 R)

Planet 7 - Ice Giant

Semi-Major Axis: 6.21 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 324.6

Radius: 7

Gravity: 6.62 G

Time & Orbit

Eccentricity (e): 0.104

Orbit Range: 5.56 AU - 6.86 AU

Year: 9992 Days

Day: 18.7 Hours

Environment

Temp: -231 °C

Axial Tilt: 2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (74)

Outer Limit: 41,534,965 km

• M1: 104,419 km (0.099 R)
• M2: 252,372 km (0.102 R)
• M3: 554,709 km (0.104 R)
• M4: 733,329 km (0.095 R)
• M5: 883,226 km (0.063 R)
• M6: 962,064 km (0.065 R)
• M7: 1,059,751 km (0.105 R)
• M8: 1,354,908 km (0.117 R)
• M9: 2,230,205 km (0.079 R)
• M10: 2,539,274 km (0.094 R)
• M11: 2,768,309 km (0.082 R)
• M12: 3,052,096 km (0.119 R)
• M13: 3,320,474 km (0.098 R)
• M14: 3,750,119 km (0.086 R)
• M15: 3,932,180 km (0.111 R)
• M16: 4,386,359 km (0.107 R)
• M17: 4,661,320 km (0.061 R)
• M18: 4,800,895 km (0.092 R)
• M19: 5,490,092 km (0.106 R)
• M20: 5,637,596 km (0.066 R)
• M21: 5,696,986 km (0.092 R)
• M22: 6,027,149 km (0.055 R)
• M23: 6,118,254 km (0.086 R)
• M24: 6,674,907 km (0.084 R)
• M25: 8,270,369 km (0.061 R)
• M26: 8,405,605 km (0.11 R)
• M27: 8,541,590 km (0.113 R)
• M28: 10,229,652 km (0.09 R)
• M29: 10,374,912 km (0.118 R)
• M30: 11,260,681 km (0.08 R)
• M31: 13,380,183 km (0.108 R)
• M32: 13,459,470 km (0.102 R)
• M33: 13,778,562 km (0.058 R)
• M34: 14,180,831 km (0.11 R)
• M35: 14,302,304 km (0.073 R)
• M36: 14,586,989 km (0.037 R)
• M37: 14,832,479 km (0.098 R)
• M38: 15,410,675 km (0.065 R)
• M39: 16,291,807 km (0.053 R)
• M40: 17,103,076 km (0.115 R)
• M41: 17,405,263 km (0.066 R)
• M42: 18,014,875 km (0.081 R)
• M43: 18,190,353 km (0.093 R)
• M44: 19,299,920 km (0.109 R)
• M45: 19,569,346 km (0.102 R)
• M46: 19,749,761 km (0.095 R)
• M47: 21,770,230 km (0.1 R)
• M48: 22,191,647 km (0.067 R)
• M49: 22,332,569 km (0.091 R)
• M50: 22,473,939 km (0.062 R)
• M51: 22,662,881 km (0.064 R)
• M52: 23,376,014 km (0.106 R)
• M53: 23,615,370 km (0.067 R)
• M54: 26,003,700 km (0.116 R)
• M55: 27,050,586 km (0.109 R)
• M56: 27,352,175 km (0.115 R)
• M57: 27,402,590 km (0.053 R)
• M58: 28,162,098 km (0.079 R)
• M59: 28,518,889 km (0.041 R)
• M60: 28,928,488 km (0.026 R)
• M61: 29,339,882 km (0.1 R)
• M62: 29,649,849 km (0.097 R)
• M63: 30,168,804 km (0.115 R)
• M64: 31,268,349 km (0.118 R)
• M65: 31,532,090 km (0.111 R)
• M66: 32,327,651 km (0.1 R)
• M67: 33,291,061 km (0.118 R)
• M68: 33,884,516 km (0.071 R)
• M69: 34,046,979 km (0.108 R)
• M70: 34,699,376 km (0.09 R)
• M71: 35,191,254 km (0.09 R)
• M72: 35,961,234 km (0.088 R)
• M73: 36,071,637 km (0.081 R)
• M74: 37,126,452 km (0.098 R)

Planet 8 - Ice Giant

Semi-Major Axis: 7.85 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 221

Radius: 6.6

Gravity: 5.07 G

Time & Orbit

Eccentricity (e): 0.198

Orbit Range: 6.3 AU - 9.4 AU

Year: 14201 Days

Day: 19.2 Hours

Environment

Temp: -224 °C

Axial Tilt: 175.8 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (55)

Outer Limit: 41,534,965 km

• M1: 101,278 km (0.07 R)
• M2: 182,210 km (0.101 R)
• M3: 245,939 km (0.082 R)
• M4: 297,401 km (0.086 R)
• M5: 426,204 km (0.1 R)
• M6: 646,263 km (0.101 R)
• M7: 737,518 km (0.099 R)
• M8: 1,073,365 km (0.086 R)
• M9: 1,412,653 km (0.092 R)
• M10: 1,512,734 km (0.119 R)
• M11: 1,936,096 km (0.1 R)
• M12: 2,490,206 km (0.073 R)
• M13: 2,587,295 km (0.081 R)
• M14: 2,784,914 km (0.076 R)
• M15: 3,142,752 km (0.095 R)
• M16: 3,353,835 km (0.056 R)
• M17: 3,461,096 km (0.031 R)
• M18: 5,325,983 km (0.095 R)
• M19: 5,736,929 km (0.066 R)
• M20: 7,550,653 km (0.087 R)
• M21: 8,047,767 km (0.105 R)
• M22: 8,592,004 km (0.091 R)
• M23: 10,139,295 km (0.036 R)
• M24: 11,365,249 km (0.113 R)
• M25: 11,445,883 km (0.083 R)
• M26: 12,553,805 km (0.067 R)
• M27: 13,226,247 km (0.094 R)
• M28: 13,481,461 km (0.112 R)
• M29: 13,867,423 km (0.091 R)
• M30: 15,046,703 km (0.113 R)
• M31: 15,670,826 km (0.098 R)
• M32: 16,167,191 km (0.097 R)
• M33: 16,303,326 km (0.109 R)
• M34: 17,407,059 km (0.108 R)
• M35: 18,534,727 km (0.116 R)
• M36: 19,540,623 km (0.054 R)
• M37: 20,318,832 km (0.096 R)
• M38: 22,968,509 km (0.12 R)
• M39: 23,480,433 km (0.095 R)
• M40: 24,255,500 km (0.067 R)
• M41: 25,143,961 km (0.086 R)
• M42: 25,565,827 km (0.106 R)
• M43: 27,655,261 km (0.094 R)
• M44: 29,465,694 km (0.11 R)
• M45: 29,687,697 km (0.081 R)
• M46: 30,357,148 km (0.103 R)
• M47: 31,597,464 km (0.109 R)
• M48: 33,778,302 km (0.107 R)
• M49: 34,652,552 km (0.03 R)
• M50: 36,066,700 km (0.032 R)
• M51: 36,661,501 km (0.04 R)
• M52: 36,960,099 km (0.106 R)
• M53: 37,740,252 km (0.116 R)
• M54: 38,890,210 km (0.087 R)
• M55: 40,236,142 km (0.088 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: 200 - 10,391 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit