🌌 Stone's Star System Generator

Asteroid Belt

Center: 0.4 AU

Composition

Type: Inner (Rocky/Metallic)

A dense region of planetesimals and debris.

Boundary

Planet 1 - Gas Giant

Semi-Major Axis: 0.79 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 619.2

Radius: 12.2

Gravity: 4.16 G

Time & Orbit

Eccentricity (e): 0.096

Orbit Range: 0.71 AU - 0.87 AU

Year: 485 Days

Day: 11 Hours

Environment

Temp: -155 °C

Axial Tilt: 10.1 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (43)

Outer Limit: 52,241,861 km

• M1: 152,739 km (0.113 R)
• M2: 253,568 km (0.099 R)
• M3: 373,995 km (0.05 R)
• M4: 558,150 km (0.101 R)
• M5: 689,197 km (0.105 R)
• M6: 793,018 km (0.051 R)
• M7: 930,050 km (0.117 R)
• M8: 1,008,888 km (0.055 R)
• M9: 1,085,333 km (0.083 R)
• M10: 1,348,326 km (0.097 R)
• M11: 1,465,910 km (0.069 R)
• M12: 1,564,943 km (0.094 R)
• M13: 1,671,906 km (0.027 R)
• M14: 1,799,064 km (0.1 R)
• M15: 1,947,615 km (0.087 R)
• M16: 2,087,937 km (0.092 R)
• M17: 2,212,852 km (0.115 R)
• M18: 2,288,997 km (0.075 R)
• M19: 2,372,622 km (0.081 R)
• M20: 2,536,282 km (0.071 R)
• M21: 2,683,487 km (0.106 R)
• M22: 2,819,770 km (0.06 R)
• M23: 3,113,730 km (0.062 R)
• M24: 3,228,472 km (0.079 R)
• M25: 3,381,061 km (0.117 R)
• M26: 3,566,114 km (0.032 R)
• M27: 3,671,132 km (0.092 R)
• M28: 3,930,534 km (0.1 R)
• M29: 4,078,337 km (0.098 R)
• M30: 4,164,655 km (0.065 R)
• M31: 4,243,643 km (0.103 R)
• M32: 4,331,158 km (0.107 R)
• M33: 4,483,897 km (0.103 R)
• M34: 4,630,204 km (0.076 R)
• M35: 4,712,183 km (0.096 R)
• M36: 4,869,261 km (0.101 R)
• M37: 4,994,475 km (0.072 R)
• M38: 5,112,358 km (0.032 R)
• M39: 5,231,288 km (0.111 R)
• M40: 5,471,841 km (0.096 R)
• M41: 5,628,321 km (0.099 R)
• M42: 6,062,005 km (0.06 R)
• M43: 6,151,913 km (0.115 R)

Planet 2 - Gas Giant

Semi-Major Axis: 3.4 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 477.6

Radius: 10.9

Gravity: 4.02 G

Time & Orbit

Eccentricity (e): 0.088

Orbit Range: 3.1 AU - 3.7 AU

Year: 4327 Days

Day: 9.4 Hours

Environment

Temp: -218 °C

Axial Tilt: 34 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (79)

Outer Limit: 52,241,861 km

• M1: 139,575 km (0.081 R)
• M2: 209,138 km (0.06 R)
• M3: 300,692 km (0.085 R)
• M4: 622,327 km (0.064 R)
• M5: 724,203 km (0.115 R)
• M6: 1,017,714 km (0.042 R)
• M7: 1,103,284 km (0.064 R)
• M8: 1,178,682 km (0.102 R)
• M9: 1,361,789 km (0.085 R)
• M10: 1,554,471 km (0.074 R)
• M11: 1,654,253 km (0.068 R)
• M12: 1,890,618 km (0.095 R)
• M13: 1,966,913 km (0.115 R)
• M14: 2,059,663 km (0.067 R)
• M15: 2,396,408 km (0.107 R)
• M16: 2,596,869 km (0.109 R)
• M17: 2,890,380 km (0.106 R)
• M18: 3,359,968 km (0.119 R)
• M19: 4,390,398 km (0.088 R)
• M20: 4,533,414 km (0.12 R)
• M21: 4,824,232 km (0.093 R)
• M22: 5,057,006 km (0.084 R)
• M23: 5,207,203 km (0.113 R)
• M24: 5,293,670 km (0.057 R)
• M25: 5,467,952 km (0.083 R)
• M26: 5,666,319 km (0.088 R)
• M27: 5,867,228 km (0.113 R)
• M28: 6,002,465 km (0.042 R)
• M29: 6,184,376 km (0.071 R)
• M30: 6,882,848 km (0.1 R)
• M31: 6,954,057 km (0.082 R)
• M32: 7,217,349 km (0.104 R)
• M33: 7,557,236 km (0.103 R)
• M34: 8,177,169 km (0.118 R)
• M35: 8,379,126 km (0.109 R)
• M36: 8,506,135 km (0.119 R)
• M37: 8,685,054 km (0.112 R)
• M38: 9,360,488 km (0.119 R)
• M39: 9,784,598 km (0.049 R)
• M40: 10,106,832 km (0.106 R)
• M41: 10,706,570 km (0.114 R)
• M42: 11,150,128 km (0.076 R)
• M43: 11,317,977 km (0.12 R)
• M44: 11,571,395 km (0.037 R)
• M45: 11,826,609 km (0.052 R)
• M46: 11,969,326 km (0.029 R)
• M47: 12,083,768 km (0.097 R)
• M48: 12,198,659 km (0.063 R)
• M49: 12,632,792 km (0.111 R)
• M50: 13,160,274 km (0.112 R)
• M51: 13,397,088 km (0.115 R)
• M52: 13,995,330 km (0.073 R)
• M53: 14,176,493 km (0.032 R)
• M54: 14,419,290 km (0.116 R)
• M55: 14,939,741 km (0.072 R)
• M56: 15,124,943 km (0.117 R)
• M57: 15,967,778 km (0.11 R)
• M58: 16,506,180 km (0.039 R)
• M59: 16,857,735 km (0.115 R)
• M60: 17,244,147 km (0.079 R)
• M61: 17,341,236 km (0.115 R)
• M62: 17,438,474 km (0.113 R)
• M63: 17,568,325 km (0.094 R)
• M64: 17,698,625 km (0.083 R)
• M65: 18,752,243 km (0.063 R)
• M66: 18,852,024 km (0.07 R)
• M67: 19,018,826 km (0.049 R)
• M68: 19,320,266 km (0.114 R)
• M69: 20,097,726 km (0.099 R)
• M70: 20,816,544 km (0.09 R)
• M71: 21,057,995 km (0.041 R)
• M72: 21,648,308 km (0.078 R)
• M73: 21,788,032 km (0.082 R)
• M74: 22,561,603 km (0.079 R)
• M75: 23,023,112 km (0.073 R)
• M76: 23,165,679 km (0.119 R)
• M77: 24,027,512 km (0.057 R)
• M78: 24,172,174 km (0.118 R)
• M79: 24,244,579 km (0.072 R)

Planet 3 - Gas Giant

Semi-Major Axis: 3.49 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 987

Radius: 14.9

Gravity: 4.45 G

Time & Orbit

Eccentricity (e): 0.05

Orbit Range: 3.32 AU - 3.66 AU

Year: 4500 Days

Day: 6.1 Hours

Environment

Temp: -226 °C

Axial Tilt: 35.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (75)

Outer Limit: 52,241,861 km

• M1: 190,438 km (0.086 R)
• M2: 325,525 km (0.057 R)
• M3: 428,747 km (0.07 R)
• M4: 709,094 km (0.119 R)
• M5: 860,637 km (0.119 R)
• M6: 996,471 km (0.119 R)
• M7: 1,482,814 km (0.117 R)
• M8: 1,649,765 km (0.104 R)
• M9: 1,894,507 km (0.087 R)
• M10: 2,003,265 km (0.089 R)
• M11: 2,151,666 km (0.052 R)
• M12: 2,639,505 km (0.106 R)
• M13: 2,761,876 km (0.077 R)
• M14: 3,012,452 km (0.049 R)
• M15: 3,314,490 km (0.069 R)
• M16: 4,018,348 km (0.026 R)
• M17: 4,279,397 km (0.11 R)
• M18: 4,375,738 km (0.109 R)
• M19: 5,019,757 km (0.07 R)
• M20: 5,588,228 km (0.114 R)
• M21: 6,231,948 km (0.057 R)
• M22: 6,451,707 km (0.1 R)
• M23: 6,927,578 km (0.073 R)
• M24: 7,589,549 km (0.101 R)
• M25: 8,121,818 km (0.027 R)
• M26: 8,574,651 km (0.117 R)
• M27: 9,129,060 km (0.086 R)
• M28: 9,473,584 km (0.027 R)
• M29: 10,143,334 km (0.092 R)
• M30: 10,272,736 km (0.066 R)
• M31: 10,663,935 km (0.118 R)
• M32: 11,260,082 km (0.09 R)
• M33: 11,461,291 km (0.025 R)
• M34: 11,663,697 km (0.094 R)
• M35: 11,765,274 km (0.076 R)
• M36: 11,867,150 km (0.101 R)
• M37: 12,209,131 km (0.063 R)
• M38: 12,312,354 km (0.102 R)
• M39: 12,554,253 km (0.045 R)
• M40: 13,895,249 km (0.104 R)
• M41: 14,219,577 km (0.113 R)
• M42: 14,875,563 km (0.101 R)
• M43: 15,207,372 km (0.115 R)
• M44: 15,318,523 km (0.117 R)
• M45: 15,578,823 km (0.113 R)
• M46: 15,690,872 km (0.113 R)
• M47: 16,520,841 km (0.119 R)
• M48: 16,979,508 km (0.069 R)
• M49: 17,403,618 km (0.103 R)
• M50: 20,756,705 km (0.073 R)
• M51: 20,921,262 km (0.099 R)
• M52: 21,044,980 km (0.107 R)
• M53: 21,667,157 km (0.108 R)
• M54: 21,792,371 km (0.029 R)
• M55: 21,917,734 km (0.109 R)
• M56: 22,295,468 km (0.102 R)
• M57: 22,464,065 km (0.053 R)
• M58: 23,570,042 km (0.076 R)
• M59: 23,827,799 km (0.073 R)
• M60: 24,563,222 km (0.108 R)
• M61: 25,174,479 km (0.115 R)
• M62: 25,614,147 km (0.117 R)
• M63: 25,834,954 km (0.106 R)
• M64: 27,038,319 km (0.114 R)
• M65: 27,759,979 km (0.078 R)
• M66: 27,941,292 km (0.105 R)
• M67: 28,396,518 km (0.094 R)
• M68: 28,716,807 km (0.082 R)
• M69: 29,038,143 km (0.03 R)
• M70: 29,823,532 km (0.116 R)
• M71: 29,916,283 km (0.111 R)
• M72: 30,055,858 km (0.041 R)
• M73: 30,288,782 km (0.054 R)
• M74: 31,085,241 km (0.071 R)
• M75: 31,179,338 km (0.117 R)

Planet 4 - Gas Giant

Semi-Major Axis: 4.41 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 856.1

Radius: 14.9

Gravity: 3.86 G

Time & Orbit

Eccentricity (e): 0.128

Orbit Range: 3.85 AU - 4.97 AU

Year: 6392 Days

Day: 8.8 Hours

Environment

Temp: -216 °C

Axial Tilt: 20.1 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (76)

Outer Limit: 52,241,861 km

• M1: 223,499 km (0.098 R)
• M2: 424,409 km (0.073 R)
• M3: 773,870 km (0.12 R)
• M4: 891,454 km (0.106 R)
• M5: 984,204 km (0.099 R)
• M6: 1,130,212 km (0.104 R)
• M7: 1,249,292 km (0.072 R)
• M8: 1,633,609 km (0.109 R)
• M9: 1,830,031 km (0.104 R)
• M10: 1,972,448 km (0.118 R)
• M11: 2,139,998 km (0.118 R)
• M12: 2,976,549 km (0.08 R)
• M13: 3,121,360 km (0.07 R)
• M14: 3,268,564 km (0.047 R)
• M15: 3,776,299 km (0.052 R)
• M16: 3,880,868 km (0.116 R)
• M17: 4,528,926 km (0.113 R)
• M18: 4,668,351 km (0.105 R)
• M19: 4,780,849 km (0.092 R)
• M20: 4,894,244 km (0.074 R)
• M21: 5,895,203 km (0.085 R)
• M22: 6,576,173 km (0.097 R)
• M23: 7,413,322 km (0.03 R)
• M24: 7,545,268 km (0.063 R)
• M25: 8,046,570 km (0.101 R)
• M26: 8,148,147 km (0.095 R)
• M27: 9,222,858 km (0.089 R)
• M28: 9,543,297 km (0.079 R)
• M29: 9,831,123 km (0.084 R)
• M30: 10,195,095 km (0.118 R)
• M31: 10,600,655 km (0.054 R)
• M32: 11,086,848 km (0.107 R)
• M33: 12,431,733 km (0.111 R)
• M34: 14,400,291 km (0.11 R)
• M35: 14,772,341 km (0.066 R)
• M36: 15,441,642 km (0.075 R)
• M37: 15,568,351 km (0.028 R)
• M38: 15,865,004 km (0.115 R)
• M39: 16,206,536 km (0.117 R)
• M40: 16,550,461 km (0.116 R)
• M41: 16,680,013 km (0.094 R)
• M42: 16,983,846 km (0.034 R)
• M43: 17,905,968 km (0.113 R)
• M44: 18,754,337 km (0.065 R)
• M45: 20,120,465 km (0.08 R)
• M46: 20,443,895 km (0.1 R)
• M47: 21,189,491 km (0.104 R)
• M48: 21,283,289 km (0.105 R)
• M49: 22,707,461 km (0.036 R)
• M50: 22,803,503 km (0.099 R)
• M51: 23,771,401 km (0.11 R)
• M52: 24,064,463 km (0.115 R)
• M53: 24,703,396 km (0.092 R)
• M54: 24,802,130 km (0.113 R)
• M55: 24,901,164 km (0.108 R)
• M56: 25,198,714 km (0.09 R)
• M57: 25,447,645 km (0.07 R)
• M58: 26,249,490 km (0.105 R)
• M59: 26,451,297 km (0.114 R)
• M60: 27,672,913 km (0.083 R)
• M61: 28,549,258 km (0.078 R)
• M62: 28,652,929 km (0.104 R)
• M63: 28,808,810 km (0.087 R)
• M64: 31,019,418 km (0.102 R)
• M65: 31,286,300 km (0.115 R)
• M66: 31,393,113 km (0.081 R)
• M67: 32,469,171 km (0.09 R)
• M68: 32,685,938 km (0.059 R)
• M69: 34,105,921 km (0.028 R)
• M70: 34,436,532 km (0.117 R)
• M71: 34,712,840 km (0.105 R)
• M72: 35,156,397 km (0.099 R)
• M73: 37,119,271 km (0.102 R)
• M74: 37,971,380 km (0.06 R)
• M75: 38,085,524 km (0.041 R)
• M76: 38,199,667 km (0.09 R)

Planet 5 - Ice Giant

Semi-Major Axis: 8.03 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 827.7

Radius: 6.7

Gravity: 18.44 G

Time & Orbit

Eccentricity (e): 0.155

Orbit Range: 6.79 AU - 9.27 AU

Year: 15707 Days

Day: 18.7 Hours

Environment

Temp: -242 °C

Axial Tilt: 39.8 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (94)

Outer Limit: 52,241,861 km

• M1: 162,762 km (0.113 R)
• M2: 406,158 km (0.041 R)
• M3: 853,605 km (0.106 R)
• M4: 1,278,314 km (0.112 R)
• M5: 2,100,803 km (0.083 R)
• M6: 3,539,037 km (0.037 R)
• M7: 4,126,208 km (0.108 R)
• M8: 4,870,308 km (0.11 R)
• M9: 5,084,233 km (0.11 R)
• M10: 5,565,938 km (0.111 R)
• M11: 6,199,785 km (0.111 R)
• M12: 6,808,947 km (0.102 R)
• M13: 7,584,462 km (0.082 R)
• M14: 9,007,886 km (0.117 R)
• M15: 9,535,817 km (0.065 R)
• M16: 10,128,225 km (0.095 R)
• M17: 10,182,678 km (0.104 R)
• M18: 10,237,132 km (0.119 R)
• M19: 10,456,293 km (0.087 R)
• M20: 11,348,345 km (0.055 R)
• M21: 12,380,720 km (0.111 R)
• M22: 12,849,260 km (0.063 R)
• M23: 13,442,865 km (0.076 R)
• M24: 13,803,396 km (0.118 R)
• M25: 13,863,833 km (0.089 R)
• M26: 14,718,635 km (0.086 R)
• M27: 14,903,987 km (0.056 R)
• M28: 15,277,084 km (0.086 R)
• M29: 15,339,616 km (0.034 R)
• M30: 15,527,511 km (0.084 R)
• M31: 16,287,019 km (0.114 R)
• M32: 16,799,990 km (0.076 R)
• M33: 16,993,720 km (0.108 R)
• M34: 17,776,117 km (0.101 R)
• M35: 17,973,586 km (0.041 R)
• M36: 18,370,619 km (0.104 R)
• M37: 19,443,534 km (0.052 R)
• M38: 20,124,504 km (0.097 R)
• M39: 21,090,757 km (0.042 R)
• M40: 21,509,481 km (0.049 R)
• M41: 22,782,110 km (0.106 R)
• M42: 22,925,126 km (0.086 R)
• M43: 23,933,715 km (0.069 R)
• M44: 25,547,876 km (0.059 R)
• M45: 25,919,626 km (0.072 R)
• M46: 26,593,265 km (0.067 R)
• M47: 29,656,282 km (0.115 R)
• M48: 30,360,589 km (0.114 R)
• M49: 30,517,966 km (0.087 R)
• M50: 30,991,443 km (0.074 R)
• M51: 31,149,717 km (0.072 R)
• M52: 31,626,486 km (0.092 R)
• M53: 32,185,683 km (0.08 R)
• M54: 32,346,052 km (0.097 R)
• M55: 32,667,687 km (0.116 R)
• M56: 33,476,114 km (0.086 R)
• M57: 34,701,320 km (0.116 R)
• M58: 35,112,864 km (0.098 R)
• M59: 38,123,970 km (0.08 R)
• M60: 38,378,586 km (0.04 R)
• M61: 39,402,882 km (0.071 R)
• M62: 39,574,471 km (0.095 R)
• M63: 40,090,584 km (0.105 R)
• M64: 41,478,104 km (0.113 R)
• M65: 42,353,252 km (0.089 R)
• M66: 44,567,599 km (0.057 R)
• M67: 45,373,932 km (0.048 R)
• M68: 45,463,840 km (0.051 R)
• M69: 45,733,864 km (0.092 R)
• M70: 46,275,558 km (0.058 R)
• M71: 46,728,540 km (0.072 R)
• M72: 47,638,993 km (0.104 R)
• M73: 47,730,397 km (0.108 R)
• M74: 49,940,556 km (0.118 R)
• M75: 51,432,496 km (0.119 R)
• M76: 51,619,942 km (0.117 R)
• M77: 51,995,732 km (0.116 R)
• M78: 53,128,337 km (0.066 R)
• M79: 55,417,933 km (0.094 R)
• M80: 56,284,703 km (0.119 R)
• M81: 56,381,343 km (0.034 R)
• M82: 57,350,289 km (0.088 R)
• M83: 57,836,781 km (0.09 R)
• M84: 57,934,319 km (0.108 R)
• M85: 58,912,090 km (0.096 R)
• M86: 61,082,307 km (0.039 R)
• M87: 62,077,282 km (0.11 R)
• M88: 62,177,064 km (0.094 R)
• M89: 62,777,101 km (0.047 R)
• M90: 63,178,023 km (0.086 R)
• M91: 63,881,881 km (0.065 R)
• M92: 64,891,966 km (0.088 R)
• M93: 65,602,107 km (0.091 R)
• M94: 66,825,369 km (0.109 R)

Planet 6 - Ice Giant

Semi-Major Axis: 9.18 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 240.6

Radius: 7.1

Gravity: 4.77 G

Time & Orbit

Eccentricity (e): 0.009

Orbit Range: 9.1 AU - 9.26 AU

Year: 19199 Days

Day: 19.5 Hours

Environment

Temp: -233 °C

Axial Tilt: 4.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (66)

Outer Limit: 52,241,861 km

• M1: 258,505 km (0.12 R)
• M2: 332,706 km (0.081 R)
• M3: 489,933 km (0.117 R)
• M4: 671,395 km (0.118 R)
• M5: 779,405 km (0.116 R)
• M6: 1,159,533 km (0.1 R)
• M7: 1,787,246 km (0.07 R)
• M8: 1,913,656 km (0.076 R)
• M9: 2,256,235 km (0.095 R)
• M10: 2,504,717 km (0.117 R)
• M11: 2,997,792 km (0.11 R)
• M12: 3,240,140 km (0.041 R)
• M13: 3,394,824 km (0.074 R)
• M14: 3,647,495 km (0.026 R)
• M15: 4,171,088 km (0.092 R)
• M16: 4,929,100 km (0.091 R)
• M17: 6,804,010 km (0.082 R)
• M18: 7,283,621 km (0.047 R)
• M19: 7,981,645 km (0.072 R)
• M20: 8,107,008 km (0.109 R)
• M21: 8,402,164 km (0.071 R)
• M22: 8,572,407 km (0.095 R)
• M23: 9,003,099 km (0.096 R)
• M24: 13,480,563 km (0.079 R)
• M25: 15,102,952 km (0.111 R)
• M26: 15,258,085 km (0.094 R)
• M27: 15,465,877 km (0.12 R)
• M28: 15,518,086 km (0.03 R)
• M29: 16,253,509 km (0.085 R)
• M30: 17,540,650 km (0.106 R)
• M31: 17,649,407 km (0.086 R)
• M32: 18,086,532 km (0.112 R)
• M33: 18,693,600 km (0.11 R)
• M34: 19,139,252 km (0.1 R)
• M35: 20,726,336 km (0.109 R)
• M36: 20,898,823 km (0.095 R)
• M37: 21,768,734 km (0.104 R)
• M38: 24,509,068 km (0.04 R)
• M39: 25,610,707 km (0.081 R)
• M40: 26,105,427 km (0.113 R)
• M41: 27,104,441 km (0.029 R)
• M42: 27,230,253 km (0.082 R)
• M43: 27,798,576 km (0.059 R)
• M44: 27,988,864 km (0.098 R)
• M45: 28,052,294 km (0.109 R)
• M46: 28,434,516 km (0.066 R)
• M47: 28,562,273 km (0.077 R)
• M48: 30,240,761 km (0.06 R)
• M49: 32,951,923 km (0.069 R)
• M50: 33,624,814 km (0.089 R)
• M51: 33,692,432 km (0.098 R)
• M52: 33,963,055 km (0.113 R)
• M53: 34,370,410 km (0.107 R)
• M54: 34,506,394 km (0.08 R)
• M55: 35,464,419 km (0.071 R)
• M56: 36,431,121 km (0.051 R)
• M57: 36,987,326 km (0.117 R)
• M58: 37,336,337 km (0.112 R)
• M59: 38,602,085 km (0.078 R)
• M60: 41,682,455 km (0.119 R)
• M61: 44,099,358 km (0.108 R)
• M62: 45,586,062 km (0.067 R)
• M63: 45,735,659 km (0.118 R)
• M64: 46,035,304 km (0.1 R)
• M65: 46,787,332 km (0.091 R)
• M66: 48,227,212 km (0.117 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: 342 - 11,284 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit