🌌 Stone's Star System Generator

Planet 1 - Terrestrial

Semi-Major Axis: 0.52 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 4.81

Radius: 1.87

Gravity: 1.38 G

Time & Orbit

Eccentricity (e): 0.242

Orbit Range: 0.39 AU - 0.65 AU

Year: 246 Days

Day: 32.4 Hours

Environment

Temp: -128 °C

Axial Tilt: 7.7 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Planet 2 - Gas Giant

Semi-Major Axis: 0.78 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 907.8

Radius: 14.9

Gravity: 4.09 G

Time & Orbit

Eccentricity (e): 0.101

Orbit Range: 0.7 AU - 0.86 AU

Year: 452 Days

Day: 10.5 Hours

Environment

Temp: -143 °C

Axial Tilt: 37.8 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (39)

Outer Limit: 61,560,166 km

• M1: 203,603 km (0.069 R)
• M2: 303,085 km (0.111 R)
• M3: 406,308 km (0.073 R)
• M4: 521,797 km (0.111 R)
• M5: 620,532 km (0.072 R)
• M6: 718,967 km (0.068 R)
• M7: 896,989 km (0.104 R)
• M8: 1,002,007 km (0.083 R)
• M9: 1,101,489 km (0.051 R)
• M10: 1,268,440 km (0.081 R)
• M11: 1,371,962 km (0.075 R)
• M12: 1,472,791 km (0.106 R)
• M13: 1,570,628 km (0.074 R)
• M14: 1,748,799 km (0.118 R)
• M15: 1,884,036 km (0.12 R)
• M16: 1,978,432 km (0.082 R)
• M17: 2,257,881 km (0.086 R)
• M18: 2,481,529 km (0.109 R)
• M19: 2,684,085 km (0.115 R)
• M20: 2,943,488 km (0.111 R)
• M21: 3,143,500 km (0.042 R)
• M22: 3,340,520 km (0.064 R)
• M23: 3,526,171 km (0.092 R)
• M24: 3,643,905 km (0.094 R)
• M25: 3,739,049 km (0.055 R)
• M26: 4,021,640 km (0.102 R)
• M27: 4,161,364 km (0.048 R)
• M28: 4,277,751 km (0.115 R)
• M29: 4,471,331 km (0.09 R)
• M30: 4,650,699 km (0.101 R)
• M31: 4,867,316 km (0.106 R)
• M32: 5,060,746 km (0.05 R)
• M33: 5,203,164 km (0.106 R)
• M34: 5,638,344 km (0.077 R)
• M35: 5,869,622 km (0.086 R)
• M36: 6,085,342 km (0.06 R)
• M37: 6,208,461 km (0.11 R)
• M38: 6,332,328 km (0.113 R)
• M39: 6,592,329 km (0.072 R)

Planet 3 - Gas Giant

Semi-Major Axis: 0.8 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 646.2

Radius: 14.6

Gravity: 3.03 G

Time & Orbit

Eccentricity (e): 0.057

Orbit Range: 0.75 AU - 0.85 AU

Year: 469 Days

Day: 7.6 Hours

Environment

Temp: -150 °C

Axial Tilt: 6.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (40)

Outer Limit: 61,560,166 km

• M1: 187,446 km (0.111 R)
• M2: 293,810 km (0.056 R)
• M3: 389,254 km (0.055 R)
• M4: 482,603 km (0.069 R)
• M5: 579,393 km (0.09 R)
• M6: 700,567 km (0.072 R)
• M7: 836,252 km (0.108 R)
• M8: 991,235 km (0.08 R)
• M9: 1,127,818 km (0.078 R)
• M10: 1,266,196 km (0.038 R)
• M11: 1,368,671 km (0.06 R)
• M12: 1,479,673 km (0.112 R)
• M13: 1,593,965 km (0.101 R)
• M14: 1,991,297 km (0.085 R)
• M15: 2,094,071 km (0.1 R)
• M16: 2,217,489 km (0.076 R)
• M17: 2,368,882 km (0.095 R)
• M18: 2,510,851 km (0.061 R)
• M19: 2,642,347 km (0.066 R)
• M20: 2,749,310 km (0.072 R)
• M21: 2,878,413 km (0.079 R)
• M22: 2,995,548 km (0.077 R)
• M23: 3,170,876 km (0.091 R)
• M24: 3,342,465 km (0.092 R)
• M25: 3,495,205 km (0.103 R)
• M26: 3,635,527 km (0.084 R)
• M27: 3,770,166 km (0.113 R)
• M28: 3,868,451 km (0.025 R)
• M29: 3,960,005 km (0.117 R)
• M30: 4,122,020 km (0.091 R)
• M31: 4,223,447 km (0.029 R)
• M32: 4,381,123 km (0.045 R)
• M33: 4,500,652 km (0.106 R)
• M34: 4,792,069 km (0.101 R)
• M35: 4,890,654 km (0.087 R)
• M36: 5,023,197 km (0.084 R)
• M37: 5,182,070 km (0.109 R)
• M38: 5,608,424 km (0.069 R)
• M39: 5,852,119 km (0.083 R)
• M40: 5,957,735 km (0.097 R)

Planet 4 - Gas Giant

Semi-Major Axis: 1.47 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 778.9

Radius: 9.2

Gravity: 9.2 G

Time & Orbit

Eccentricity (e): 0.205

Orbit Range: 1.17 AU - 1.77 AU

Year: 1169 Days

Day: 13.9 Hours

Environment

Temp: -174 °C

Axial Tilt: 19.3 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (64)

Outer Limit: 61,560,166 km

• M1: 124,465 km (0.09 R)
• M2: 202,107 km (0.069 R)
• M3: 284,236 km (0.064 R)
• M4: 357,838 km (0.041 R)
• M5: 418,425 km (0.056 R)
• M6: 489,035 km (0.077 R)
• M7: 594,652 km (0.094 R)
• M8: 689,048 km (0.066 R)
• M9: 748,438 km (0.07 R)
• M10: 886,966 km (0.092 R)
• M11: 1,026,840 km (0.081 R)
• M12: 1,126,771 km (0.072 R)
• M13: 1,254,528 km (0.097 R)
• M14: 1,353,711 km (0.091 R)
• M15: 1,438,384 km (0.076 R)
• M16: 1,498,821 km (0.092 R)
• M17: 1,676,095 km (0.058 R)
• M18: 1,898,098 km (0.111 R)
• M19: 1,974,243 km (0.086 R)
• M20: 2,071,033 km (0.06 R)
• M21: 2,139,698 km (0.088 R)
• M22: 2,350,183 km (0.099 R)
• M23: 2,421,990 km (0.105 R)
• M24: 2,515,339 km (0.066 R)
• M25: 2,620,506 km (0.107 R)
• M26: 2,759,333 km (0.097 R)
• M27: 2,878,861 km (0.053 R)
• M28: 2,966,825 km (0.058 R)
• M29: 3,281,878 km (0.099 R)
• M30: 3,548,910 km (0.111 R)
• M31: 3,702,846 km (0.081 R)
• M32: 3,786,771 km (0.114 R)
• M33: 4,054,551 km (0.094 R)
• M34: 4,178,269 km (0.107 R)
• M35: 4,920,723 km (0.072 R)
• M36: 5,052,967 km (0.1 R)
• M37: 5,239,965 km (0.055 R)
• M38: 5,388,515 km (0.092 R)
• M39: 5,456,582 km (0.097 R)
• M40: 5,786,894 km (0.106 R)
• M41: 5,926,469 km (0.118 R)
• M42: 5,996,780 km (0.073 R)
• M43: 6,237,633 km (0.088 R)
• M44: 6,452,755 km (0.048 R)
• M45: 6,554,032 km (0.11 R)
• M46: 6,655,759 km (0.084 R)
• M47: 6,994,000 km (0.095 R)
• M48: 7,187,579 km (0.07 R)
• M49: 7,262,528 km (0.097 R)
• M50: 7,473,910 km (0.118 R)
• M51: 7,610,792 km (0.095 R)
• M52: 7,856,132 km (0.06 R)
• M53: 8,465,295 km (0.078 R)
• M54: 8,592,154 km (0.111 R)
• M55: 9,041,097 km (0.101 R)
• M56: 9,284,792 km (0.071 R)
• M57: 9,350,166 km (0.109 R)
• M58: 9,415,690 km (0.105 R)
• M59: 9,514,275 km (0.102 R)
• M60: 9,646,071 km (0.092 R)
• M61: 9,861,791 km (0.08 R)
• M62: 10,062,402 km (0.109 R)
• M63: 10,689,067 km (0.078 R)
• M64: 11,050,496 km (0.048 R)

Planet 5 - Gas Giant

Semi-Major Axis: 1.78 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 69.7

Radius: 11.2

Gravity: 0.56 G

Time & Orbit

Eccentricity (e): 0.247

Orbit Range: 1.34 AU - 2.22 AU

Year: 1558 Days

Day: 10.8 Hours

Environment

Temp: -178 °C

Axial Tilt: 38.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (33)

Outer Limit: 61,560,166 km

• M1: 148,700 km (0.108 R)
• M2: 313,258 km (0.117 R)
• M3: 474,973 km (0.081 R)
• M4: 806,931 km (0.092 R)
• M5: 908,059 km (0.114 R)
• M6: 1,155,045 km (0.07 R)
• M7: 1,265,448 km (0.095 R)
• M8: 1,407,267 km (0.11 R)
• M9: 1,485,956 km (0.114 R)
• M10: 1,719,179 km (0.069 R)
• M11: 2,008,501 km (0.095 R)
• M12: 2,287,202 km (0.07 R)
• M13: 2,421,242 km (0.07 R)
• M14: 2,697,100 km (0.103 R)
• M15: 2,774,741 km (0.119 R)
• M16: 3,264,226 km (0.106 R)
• M17: 3,415,619 km (0.056 R)
• M18: 3,553,997 km (0.049 R)
• M19: 3,631,638 km (0.092 R)
• M20: 3,820,430 km (0.111 R)
• M21: 3,932,030 km (0.108 R)
• M22: 4,109,753 km (0.116 R)
• M23: 4,422,861 km (0.095 R)
• M24: 4,590,859 km (0.054 R)
• M25: 4,795,210 km (0.069 R)
• M26: 4,907,259 km (0.094 R)
• M27: 5,125,073 km (0.087 R)
• M28: 5,239,516 km (0.03 R)
• M29: 5,498,171 km (0.066 R)
• M30: 5,606,479 km (0.117 R)
• M31: 5,825,042 km (0.116 R)
• M32: 6,139,796 km (0.092 R)
• M33: 6,317,967 km (0.082 R)

Planet 6 - Gas Giant

Semi-Major Axis: 2.13 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 989.9

Radius: 11.8

Gravity: 7.11 G

Time & Orbit

Eccentricity (e): 0.055

Orbit Range: 2.01 AU - 2.25 AU

Year: 2039 Days

Day: 14.8 Hours

Environment

Temp: -199 °C

Axial Tilt: 4.4 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (70)

Outer Limit: 61,560,166 km

• M1: 155,432 km (0.112 R)
• M2: 462,557 km (0.118 R)
• M3: 584,180 km (0.047 R)
• M4: 683,662 km (0.032 R)
• M5: 844,929 km (0.099 R)
• M6: 969,993 km (0.116 R)
• M7: 1,338,901 km (0.119 R)
• M8: 1,713,943 km (0.094 R)
• M9: 1,913,955 km (0.093 R)
• M10: 2,378,157 km (0.108 R)
• M11: 2,731,208 km (0.069 R)
• M12: 2,981,037 km (0.093 R)
• M13: 3,284,571 km (0.114 R)
• M14: 3,362,063 km (0.042 R)
• M15: 3,614,135 km (0.057 R)
• M16: 3,726,483 km (0.043 R)
• M17: 4,037,198 km (0.059 R)
• M18: 4,424,656 km (0.1 R)
• M19: 4,527,729 km (0.082 R)
• M20: 4,771,274 km (0.058 R)
• M21: 4,930,297 km (0.033 R)
• M22: 5,109,066 km (0.108 R)
• M23: 5,199,124 km (0.073 R)
• M24: 5,326,283 km (0.062 R)
• M25: 5,417,836 km (0.116 R)
• M26: 5,602,291 km (0.114 R)
• M27: 5,676,641 km (0.076 R)
• M28: 5,826,388 km (0.074 R)
• M29: 6,072,626 km (0.094 R)
• M30: 6,283,709 km (0.041 R)
• M31: 6,380,499 km (0.081 R)
• M32: 6,713,204 km (0.105 R)
• M33: 6,871,778 km (0.091 R)
• M34: 7,132,078 km (0.117 R)
• M35: 7,273,598 km (0.059 R)
• M36: 7,559,480 km (0.076 R)
• M37: 7,807,363 km (0.104 R)
• M38: 8,311,508 km (0.096 R)
• M39: 8,718,115 km (0.094 R)
• M40: 9,065,481 km (0.118 R)
• M41: 9,174,987 km (0.094 R)
• M42: 9,439,775 km (0.109 R)
• M43: 9,819,006 km (0.096 R)
• M44: 10,248,801 km (0.108 R)
• M45: 10,408,721 km (0.12 R)
• M46: 10,963,430 km (0.105 R)
• M47: 11,056,779 km (0.043 R)
• M48: 11,338,471 km (0.12 R)
• M49: 11,575,135 km (0.097 R)
• M50: 12,053,250 km (0.101 R)
• M51: 12,149,591 km (0.095 R)
• M52: 12,367,555 km (0.055 R)
• M53: 12,660,019 km (0.117 R)
• M54: 12,733,472 km (0.063 R)
• M55: 13,127,812 km (0.118 R)
• M56: 13,251,978 km (0.096 R)
• M57: 13,551,323 km (0.103 R)
• M58: 14,437,092 km (0.042 R)
• M59: 14,590,879 km (0.074 R)
• M60: 15,263,471 km (0.044 R)
• M61: 15,498,639 km (0.09 R)
• M62: 15,840,470 km (0.11 R)
• M63: 16,078,630 km (0.114 R)
• M64: 16,264,580 km (0.116 R)
• M65: 16,961,855 km (0.117 R)
• M66: 17,070,015 km (0.114 R)
• M67: 18,274,577 km (0.086 R)
• M68: 18,385,429 km (0.103 R)
• M69: 18,468,755 km (0.092 R)
• M70: 18,663,681 km (0.038 R)

Planet 7 - Gas Giant

Semi-Major Axis: 4.94 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 503.8

Radius: 13.9

Gravity: 2.61 G

Time & Orbit

Eccentricity (e): 0.111

Orbit Range: 4.39 AU - 5.49 AU

Year: 7203 Days

Day: 9.2 Hours

Environment

Temp: -208 °C

Axial Tilt: 31.3 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (79)

Outer Limit: 61,560,166 km

• M1: 178,620 km (0.063 R)
• M2: 317,895 km (0.093 R)
• M3: 619,036 km (0.088 R)
• M4: 759,359 km (0.084 R)
• M5: 869,164 km (0.111 R)
• M6: 955,631 km (0.11 R)
• M7: 1,250,489 km (0.105 R)
• M8: 1,366,726 km (0.12 R)
• M9: 1,831,826 km (0.091 R)
• M10: 2,925,536 km (0.062 R)
• M11: 3,060,473 km (0.094 R)
• M12: 3,864,861 km (0.093 R)
• M13: 4,291,065 km (0.028 R)
• M14: 4,812,115 km (0.065 R)
• M15: 4,918,778 km (0.078 R)
• M16: 5,134,349 km (0.056 R)
• M17: 5,857,056 km (0.073 R)
• M18: 6,114,813 km (0.084 R)
• M19: 6,259,624 km (0.111 R)
• M20: 6,611,777 km (0.112 R)
• M21: 6,940,444 km (0.051 R)
• M22: 7,031,100 km (0.087 R)
• M23: 7,428,133 km (0.107 R)
• M24: 7,520,883 km (0.106 R)
• M25: 8,180,460 km (0.108 R)
• M26: 8,695,675 km (0.085 R)
• M27: 8,990,084 km (0.073 R)
• M28: 9,122,029 km (0.046 R)
• M29: 9,555,265 km (0.061 R)
• M30: 9,656,243 km (0.11 R)
• M31: 10,441,931 km (0.107 R)
• M32: 10,825,052 km (0.081 R)
• M33: 10,930,368 km (0.094 R)
• M34: 11,177,355 km (0.071 R)
• M35: 11,390,531 km (0.096 R)
• M36: 11,712,915 km (0.098 R)
• M37: 11,821,074 km (0.095 R)
• M38: 12,002,088 km (0.053 R)
• M39: 12,110,995 km (0.094 R)
• M40: 12,330,156 km (0.088 R)
• M41: 12,513,712 km (0.117 R)
• M42: 13,144,567 km (0.104 R)
• M43: 13,709,897 km (0.03 R)
• M44: 14,206,263 km (0.096 R)
• M45: 14,514,584 km (0.118 R)
• M46: 14,708,612 km (0.105 R)
• M47: 15,492,804 km (0.104 R)
• M48: 15,889,987 km (0.096 R)
• M49: 16,572,901 km (0.114 R)
• M50: 16,816,297 km (0.05 R)
• M51: 17,347,668 km (0.114 R)
• M52: 17,553,515 km (0.111 R)
• M53: 17,967,751 km (0.113 R)
• M54: 18,385,130 km (0.051 R)
• M55: 18,552,978 km (0.114 R)
• M56: 18,805,649 km (0.111 R)
• M57: 19,656,412 km (0.07 R)
• M58: 21,395,338 km (0.043 R)
• M59: 22,327,931 km (0.108 R)
• M60: 22,596,908 km (0.096 R)
• M61: 22,957,140 km (0.112 R)
• M62: 23,273,838 km (0.031 R)
• M63: 23,410,122 km (0.11 R)
• M64: 24,370,989 km (0.073 R)
• M65: 25,438,071 km (0.087 R)
• M66: 26,331,020 km (0.099 R)
• M67: 26,852,818 km (0.101 R)
• M68: 27,043,405 km (0.106 R)
• M69: 27,858,265 km (0.108 R)
• M70: 28,341,466 km (0.09 R)
• M71: 28,632,733 km (0.095 R)
• M72: 29,709,090 km (0.073 R)
• M73: 30,301,797 km (0.082 R)
• M74: 30,400,980 km (0.081 R)
• M75: 32,103,254 km (0.094 R)
• M76: 32,305,511 km (0.058 R)
• M77: 32,914,972 km (0.108 R)
• M78: 34,300,099 km (0.105 R)
• M79: 34,662,425 km (0.071 R)

Planet 8 - Ice Giant

Semi-Major Axis: 8.12 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 629.8

Radius: 4.4

Gravity: 32.53 G

Time & Orbit

Eccentricity (e): 0.216

Orbit Range: 6.37 AU - 9.87 AU

Year: 15179 Days

Day: 24.1 Hours

Environment

Temp: -220 °C

Axial Tilt: 8.3 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (89)

Outer Limit: 61,560,166 km

• M1: 64,776 km (0.116 R)
• M2: 191,036 km (0.027 R)
• M3: 327,619 km (0.11 R)
• M4: 492,476 km (0.105 R)
• M5: 565,330 km (0.119 R)
• M6: 622,327 km (0.114 R)
• M7: 721,810 km (0.108 R)
• M8: 913,893 km (0.111 R)
• M9: 1,145,321 km (0.118 R)
• M10: 1,578,856 km (0.11 R)
• M11: 2,058,317 km (0.107 R)
• M12: 2,087,937 km (0.063 R)
• M13: 2,579,516 km (0.111 R)
• M14: 2,838,470 km (0.11 R)
• M15: 3,004,374 km (0.109 R)
• M16: 3,242,085 km (0.066 R)
• M17: 3,450,774 km (0.09 R)
• M18: 3,771,811 km (0.074 R)
• M19: 3,880,868 km (0.11 R)
• M20: 4,028,072 km (0.063 R)
• M21: 4,673,737 km (0.05 R)
• M22: 5,028,433 km (0.12 R)
• M23: 5,763,557 km (0.071 R)
• M24: 6,100,900 km (0.116 R)
• M25: 6,444,676 km (0.103 R)
• M26: 6,531,742 km (0.098 R)
• M27: 6,883,297 km (0.099 R)
• M28: 7,151,077 km (0.059 R)
• M29: 9,560,800 km (0.092 R)
• M30: 9,909,513 km (0.115 R)
• M31: 10,619,205 km (0.118 R)
• M32: 11,397,862 km (0.071 R)
• M33: 11,608,496 km (0.055 R)
• M34: 12,302,181 km (0.065 R)
• M35: 14,122,338 km (0.115 R)
• M36: 14,633,215 km (0.087 R)
• M37: 14,919,545 km (0.096 R)
• M38: 16,915,630 km (0.089 R)
• M39: 17,216,172 km (0.118 R)
• M40: 17,822,642 km (0.073 R)
• M41: 19,306,204 km (0.033 R)
• M42: 19,683,340 km (0.062 R)
• M43: 19,936,011 km (0.111 R)
• M44: 22,719,877 km (0.093 R)
• M45: 23,317,671 km (0.119 R)
• M46: 23,853,530 km (0.088 R)
• M47: 24,937,217 km (0.077 R)
• M48: 25,005,583 km (0.117 R)
• M49: 26,383,828 km (0.111 R)
• M50: 27,363,246 km (0.046 R)
• M51: 28,283,273 km (0.086 R)
• M52: 28,354,481 km (0.112 R)
• M53: 31,177,243 km (0.111 R)
• M54: 31,324,298 km (0.1 R)
• M55: 32,063,611 km (0.038 R)
• M56: 33,183,201 km (0.087 R)
• M57: 34,163,666 km (0.087 R)
• M58: 35,000,965 km (0.109 R)
• M59: 35,077,410 km (0.083 R)
• M60: 35,460,380 km (0.062 R)
• M61: 35,844,847 km (0.117 R)
• M62: 37,709,135 km (0.107 R)
• M63: 37,944,453 km (0.12 R)
• M64: 38,180,219 km (0.115 R)
• M65: 38,258,907 km (0.068 R)
• M66: 40,724,879 km (0.114 R)
• M67: 41,127,447 km (0.075 R)
• M68: 43,241,863 km (0.092 R)
• M69: 43,734,788 km (0.113 R)
• M70: 43,899,495 km (0.037 R)
• M71: 44,394,963 km (0.032 R)
• M72: 45,141,457 km (0.093 R)
• M73: 47,575,264 km (0.074 R)
• M74: 47,829,431 km (0.068 R)
• M75: 48,680,045 km (0.097 R)
• M76: 48,765,465 km (0.118 R)
• M77: 49,278,436 km (0.114 R)
• M78: 51,609,171 km (0.096 R)
• M79: 51,870,369 km (0.118 R)
• M80: 52,306,596 km (0.074 R)
• M81: 52,919,499 km (0.113 R)
• M82: 53,887,247 km (0.065 R)
• M83: 55,216,424 km (0.113 R)
• M84: 56,466,763 km (0.043 R)
• M85: 57,095,374 km (0.115 R)
• M86: 57,906,942 km (0.098 R)
• M87: 60,090,024 km (0.043 R)
• M88: 60,273,132 km (0.115 R)
• M89: 60,823,652 km (0.108 R)

Kuiper Belt

Range: 30 - 53 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 187 - 10,438 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit