🌌 Stone's Star System Generator

Planet 1 - Terrestrial

Semi-Major Axis: 0.71 AU

Status: Inner (Hot)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 3.68

Radius: 1.68

Gravity: 1.3 G

Time & Orbit

Eccentricity (e): 0.18

Orbit Range: 0.58 AU - 0.84 AU

Year: 220 Days

Day: 23.4 Hours

Environment

Temp: 169 °C

Axial Tilt: 20.7 °

Atmosphere: Dense CO₂

Biome: Volcanic/Barren

Satellites (1)

Outer Limit: 47,240,721 km

• M1: 108,309 km (0.105 R)

Planet 2 - Terrestrial

Semi-Major Axis: 1.98 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 2.39

Radius: 1.42

Gravity: 1.19 G

Time & Orbit

Eccentricity (e): 0.216

Orbit Range: 1.55 AU - 2.41 AU

Year: 1023 Days

Day: 23.4 Hours

Environment

Temp: -64 °C

Axial Tilt: 29.1 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Planet 3 - Terrestrial

Semi-Major Axis: 2.79 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 1.76

Radius: 1.25

Gravity: 1.13 G

Time & Orbit

Eccentricity (e): 0.152

Orbit Range: 2.37 AU - 3.21 AU

Year: 1711 Days

Day: 41.3 Hours

Environment

Temp: -93 °C

Axial Tilt: 24.4 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Planet 4 - Terrestrial

Semi-Major Axis: 3.78 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 4.42

Radius: 1.81

Gravity: 1.35 G

Time & Orbit

Eccentricity (e): 0.057

Orbit Range: 3.56 AU - 4 AU

Year: 2698 Days

Day: 30.1 Hours

Environment

Temp: -111 °C

Axial Tilt: 37.6 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Planet 5 - Gas Giant

Semi-Major Axis: 5.54 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 529.9

Radius: 10.7

Gravity: 4.63 G

Time & Orbit

Eccentricity (e): 0.068

Orbit Range: 5.16 AU - 5.92 AU

Year: 4787 Days

Day: 5.3 Hours

Environment

Temp: -142 °C

Axial Tilt: 33.7 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (79)

Outer Limit: 47,240,721 km

• M1: 192,383 km (0.115 R)
• M2: 469,289 km (0.1 R)
• M3: 556,654 km (0.101 R)
• M4: 797,057 km (0.098 R)
• M5: 917,633 km (0.026 R)
• M6: 1,205,310 km (0.085 R)
• M7: 1,359,994 km (0.066 R)
• M8: 1,476,830 km (0.067 R)
• M9: 1,643,033 km (0.091 R)
• M10: 1,783,805 km (0.094 R)
• M11: 2,145,084 km (0.079 R)
• M12: 2,264,912 km (0.12 R)
• M13: 2,766,813 km (0.106 R)
• M14: 3,362,212 km (0.118 R)
• M15: 3,829,406 km (0.097 R)
• M16: 3,933,676 km (0.111 R)
• M17: 4,187,992 km (0.047 R)
• M18: 4,274,011 km (0.111 R)
• M19: 4,360,479 km (0.035 R)
• M20: 4,491,526 km (0.084 R)
• M21: 5,421,277 km (0.115 R)
• M22: 6,065,446 km (0.07 R)
• M23: 6,260,970 km (0.1 R)
• M24: 6,809,545 km (0.088 R)
• M25: 7,064,011 km (0.104 R)
• M26: 7,451,769 km (0.095 R)
• M27: 7,766,822 km (0.118 R)
• M28: 7,846,259 km (0.065 R)
• M29: 8,573,753 km (0.047 R)
• M30: 8,848,714 km (0.086 R)
• M31: 9,070,717 km (0.097 R)
• M32: 9,210,442 km (0.101 R)
• M33: 9,350,914 km (0.071 R)
• M34: 9,463,860 km (0.085 R)
• M35: 9,662,377 km (0.114 R)
• M36: 10,092,770 km (0.075 R)
• M37: 10,794,234 km (0.107 R)
• M38: 11,001,727 km (0.065 R)
• M39: 11,270,704 km (0.077 R)
• M40: 11,451,119 km (0.117 R)
• M41: 12,059,533 km (0.105 R)
• M42: 12,803,483 km (0.116 R)
• M43: 13,339,493 km (0.079 R)
• M44: 13,530,379 km (0.099 R)
• M45: 13,914,996 km (0.117 R)
• M46: 14,205,814 km (0.109 R)
• M47: 14,303,202 km (0.109 R)
• M48: 14,760,672 km (0.068 R)
• M49: 14,859,257 km (0.062 R)
• M50: 14,958,141 km (0.092 R)
• M51: 15,355,773 km (0.035 R)
• M52: 15,589,445 km (0.076 R)
• M53: 15,958,951 km (0.101 R)
• M54: 16,263,383 km (0.112 R)
• M55: 16,638,126 km (0.076 R)
• M56: 16,740,750 km (0.066 R)
• M57: 17,015,711 km (0.042 R)
• M58: 17,188,197 km (0.057 R)
• M59: 17,361,431 km (0.113 R)
• M60: 17,709,396 km (0.088 R)
• M61: 18,059,754 km (0.084 R)
• M62: 18,447,811 km (0.103 R)
• M63: 18,554,026 km (0.063 R)
• M64: 18,802,956 km (0.055 R)
• M65: 19,160,346 km (0.108 R)
• M66: 19,918,358 km (0.102 R)
• M67: 21,240,354 km (0.067 R)
• M68: 21,314,555 km (0.038 R)
• M69: 22,363,535 km (0.099 R)
• M70: 23,314,230 km (0.118 R)
• M71: 23,429,271 km (0.097 R)
• M72: 24,045,763 km (0.075 R)
• M73: 24,200,597 km (0.113 R)
• M74: 24,317,134 km (0.06 R)
• M75: 24,941,107 km (0.082 R)
• M76: 25,176,574 km (0.071 R)
• M77: 25,609,959 km (0.103 R)
• M78: 26,684,520 km (0.098 R)
• M79: 26,925,223 km (0.113 R)

Planet 6 - Gas Giant

Semi-Major Axis: 9.08 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 955.2

Radius: 8

Gravity: 14.93 G

Time & Orbit

Eccentricity (e): 0.245

Orbit Range: 6.86 AU - 11.3 AU

Year: 10044 Days

Day: 14.6 Hours

Environment

Temp: -171 °C

Axial Tilt: 7.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (94)

Outer Limit: 47,240,721 km

• M1: 113,096 km (0.084 R)
• M2: 218,263 km (0.049 R)
• M3: 274,362 km (0.057 R)
• M4: 560,992 km (0.106 R)
• M5: 1,156,840 km (0.119 R)
• M6: 1,244,953 km (0.087 R)
• M7: 1,404,574 km (0.1 R)
• M8: 1,498,971 km (0.105 R)
• M9: 1,669,213 km (0.103 R)
• M10: 1,719,029 km (0.057 R)
• M11: 1,897,499 km (0.077 R)
• M12: 2,002,218 km (0.111 R)
• M13: 2,135,809 km (0.106 R)
• M14: 2,217,489 km (0.051 R)
• M15: 2,355,867 km (0.104 R)
• M16: 2,583,256 km (0.116 R)
• M17: 2,699,643 km (0.047 R)
• M18: 2,817,825 km (0.094 R)
• M19: 3,151,728 km (0.031 R)
• M20: 3,725,137 km (0.109 R)
• M21: 4,715,624 km (0.075 R)
• M22: 4,966,500 km (0.07 R)
• M23: 5,406,467 km (0.12 R)
• M24: 5,556,065 km (0.092 R)
• M25: 5,782,855 km (0.117 R)
• M26: 5,974,191 km (0.049 R)
• M27: 6,051,234 km (0.039 R)
• M28: 6,167,621 km (0.118 R)
• M29: 6,840,811 km (0.114 R)
• M30: 7,043,217 km (0.113 R)
• M31: 7,206,578 km (0.102 R)
• M32: 7,454,013 km (0.051 R)
• M33: 7,999,597 km (0.04 R)
• M34: 8,298,792 km (0.039 R)
• M35: 9,986,107 km (0.114 R)
• M36: 10,680,540 km (0.049 R)
• M37: 11,057,377 km (0.106 R)
• M38: 13,155,936 km (0.118 R)
• M39: 13,407,859 km (0.036 R)
• M40: 13,814,316 km (0.094 R)
• M41: 14,691,109 km (0.117 R)
• M42: 14,743,319 km (0.106 R)
• M43: 14,795,529 km (0.089 R)
• M44: 16,228,227 km (0.102 R)
• M45: 16,390,092 km (0.072 R)
• M46: 17,483,204 km (0.062 R)
• M47: 18,094,461 km (0.115 R)
• M48: 20,085,459 km (0.08 R)
• M49: 20,143,353 km (0.112 R)
• M50: 20,608,603 km (0.102 R)
• M51: 21,313,059 km (0.119 R)
• M52: 21,549,573 km (0.105 R)
• M53: 22,144,823 km (0.107 R)
• M54: 23,473,402 km (0.04 R)
• M55: 23,595,474 km (0.101 R)
• M56: 23,717,695 km (0.101 R)
• M57: 24,085,856 km (0.04 R)
• M58: 24,394,027 km (0.085 R)
• M59: 25,576,898 km (0.082 R)
• M60: 25,765,391 km (0.065 R)
• M61: 26,397,143 km (0.089 R)
• M62: 26,969,953 km (0.055 R)
• M63: 28,712,918 km (0.088 R)
• M64: 28,974,116 km (0.117 R)
• M65: 29,039,639 km (0.11 R)
• M66: 29,630,850 km (0.081 R)
• M67: 30,892,110 km (0.111 R)
• M68: 34,086,623 km (0.045 R)
• M69: 34,501,907 km (0.06 R)
• M70: 35,058,411 km (0.105 R)
• M71: 35,968,714 km (0.037 R)
• M72: 36,039,174 km (0.06 R)
• M73: 36,250,406 km (0.06 R)
• M74: 36,391,627 km (0.114 R)
• M75: 36,674,367 km (0.097 R)
• M76: 38,027,629 km (0.062 R)
• M77: 38,099,287 km (0.062 R)
• M78: 39,252,237 km (0.038 R)
• M79: 39,324,643 km (0.044 R)
• M80: 39,397,048 km (0.07 R)
• M81: 39,469,603 km (0.077 R)
• M82: 39,905,681 km (0.105 R)
• M83: 41,887,853 km (0.111 R)
• M84: 43,002,806 km (0.05 R)
• M85: 43,451,599 km (0.112 R)
• M86: 45,413,874 km (0.092 R)
• M87: 46,023,486 km (0.103 R)
• M88: 49,502,683 km (0.071 R)
• M89: 50,917,879 km (0.062 R)
• M90: 51,789,287 km (0.105 R)
• M91: 52,027,895 km (0.118 R)
• M92: 52,745,516 km (0.099 R)
• M93: 52,905,437 km (0.094 R)
• M94: 53,466,578 km (0.077 R)

Planet 7 - Gas Giant

Semi-Major Axis: 9.74 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 952.9

Radius: 12.4

Gravity: 6.2 G

Time & Orbit

Eccentricity (e): 0.055

Orbit Range: 9.2 AU - 10.28 AU

Year: 11159 Days

Day: 8 Hours

Environment

Temp: -183 °C

Axial Tilt: 12.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (83)

Outer Limit: 47,240,721 km

• M1: 702,212 km (0.026 R)
• M2: 1,194,838 km (0.049 R)
• M3: 1,453,343 km (0.047 R)
• M4: 1,551,928 km (0.099 R)
• M5: 1,969,755 km (0.119 R)
• M6: 2,079,710 km (0.108 R)
• M7: 2,191,908 km (0.105 R)
• M8: 3,389,888 km (0.063 R)
• M9: 4,321,134 km (0.027 R)
• M10: 4,759,606 km (0.101 R)
• M11: 5,405,121 km (0.116 R)
• M12: 5,482,912 km (0.104 R)
• M13: 6,363,445 km (0.112 R)
• M14: 6,528,152 km (0.088 R)
• M15: 7,159,006 km (0.099 R)
• M16: 7,244,576 km (0.102 R)
• M17: 7,503,530 km (0.114 R)
• M18: 9,212,985 km (0.063 R)
• M19: 9,587,728 km (0.074 R)
• M20: 9,919,835 km (0.074 R)
• M21: 11,687,034 km (0.077 R)
• M22: 11,788,013 km (0.09 R)
• M23: 11,991,017 km (0.084 R)
• M24: 12,970,584 km (0.09 R)
• M25: 13,390,805 km (0.118 R)
• M26: 14,569,337 km (0.117 R)
• M27: 15,725,130 km (0.103 R)
• M28: 15,892,679 km (0.106 R)
• M29: 16,173,325 km (0.074 R)
• M30: 19,966,828 km (0.092 R)
• M31: 20,087,852 km (0.118 R)
• M32: 21,187,098 km (0.08 R)
• M33: 22,683,226 km (0.077 R)
• M34: 23,126,036 km (0.098 R)
• M35: 24,342,117 km (0.116 R)
• M36: 24,665,697 km (0.095 R)
• M37: 25,055,848 km (0.097 R)
• M38: 25,186,298 km (0.103 R)
• M39: 25,842,135 km (0.06 R)
• M40: 26,106,025 km (0.092 R)
• M41: 27,775,687 km (0.107 R)
• M42: 28,725,783 km (0.107 R)
• M43: 28,999,248 km (0.1 R)
• M44: 29,273,461 km (0.108 R)
• M45: 29,755,615 km (0.107 R)
• M46: 31,287,647 km (0.082 R)
• M47: 32,276,040 km (0.052 R)
• M48: 33,705,597 km (0.061 R)
• M49: 34,138,533 km (0.104 R)
• M50: 35,228,803 km (0.072 R)
• M51: 35,962,131 km (0.057 R)
• M52: 36,183,087 km (0.053 R)
• M53: 37,967,042 km (0.054 R)
• M54: 38,794,169 km (0.059 R)
• M55: 39,399,442 km (0.043 R)
• M56: 40,084,151 km (0.086 R)
• M57: 40,236,890 km (0.098 R)
• M58: 41,388,345 km (0.108 R)
• M59: 42,006,783 km (0.1 R)
• M60: 44,195,549 km (0.082 R)
• M61: 45,861,471 km (0.104 R)
• M62: 46,421,266 km (0.089 R)
• M63: 46,983,306 km (0.059 R)
• M64: 48,033,184 km (0.104 R)
• M65: 48,439,043 km (0.08 R)
• M66: 49,417,861 km (0.057 R)
• M67: 49,827,610 km (0.076 R)
• M68: 50,073,998 km (0.116 R)
• M69: 50,567,970 km (0.079 R)
• M70: 50,732,976 km (0.069 R)
• M71: 51,560,701 km (0.115 R)
• M72: 51,893,108 km (0.102 R)
• M73: 52,476,539 km (0.064 R)
• M74: 52,643,491 km (0.072 R)
• M75: 52,727,116 km (0.119 R)
• M76: 53,733,910 km (0.061 R)
• M77: 54,070,804 km (0.094 R)
• M78: 55,001,153 km (0.071 R)
• M79: 55,510,833 km (0.034 R)
• M80: 56,363,840 km (0.109 R)
• M81: 56,620,550 km (0.05 R)
• M82: 56,791,840 km (0.117 R)
• M83: 57,049,298 km (0.091 R)

Planet 8 - Gas Giant

Semi-Major Axis: 10.1 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 427

Radius: 10.1

Gravity: 4.19 G

Time & Orbit

Eccentricity (e): 0.023

Orbit Range: 9.87 AU - 10.33 AU

Year: 11783 Days

Day: 9.2 Hours

Environment

Temp: -166 °C

Axial Tilt: 10.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (83)

Outer Limit: 47,240,721 km

• M1: 178,171 km (0.027 R)
• M2: 681,418 km (0.04 R)
• M3: 795,113 km (0.11 R)
• M4: 898,036 km (0.107 R)
• M5: 1,294,620 km (0.06 R)
• M6: 1,697,637 km (0.107 R)
• M7: 2,066,695 km (0.051 R)
• M8: 2,614,821 km (0.066 R)
• M9: 2,772,049 km (0.09 R)
• M10: 3,123,454 km (0.119 R)
• M11: 4,048,118 km (0.109 R)
• M12: 4,291,963 km (0.119 R)
• M13: 4,890,504 km (0.027 R)
• M14: 5,315,063 km (0.087 R)
• M15: 5,819,806 km (0.101 R)
• M16: 5,922,580 km (0.041 R)
• M17: 6,587,692 km (0.06 R)
• M18: 7,202,838 km (0.116 R)
• M19: 7,610,792 km (0.091 R)
• M20: 7,912,231 km (0.094 R)
• M21: 8,371,646 km (0.044 R)
• M22: 8,565,675 km (0.068 R)
• M23: 8,643,615 km (0.102 R)
• M24: 9,077,150 km (0.067 R)
• M25: 9,436,933 km (0.043 R)
• M26: 10,336,465 km (0.055 R)
• M27: 10,628,330 km (0.066 R)
• M28: 10,712,255 km (0.084 R)
• M29: 11,434,364 km (0.068 R)
• M30: 11,693,018 km (0.094 R)
• M31: 11,779,636 km (0.042 R)
• M32: 11,910,085 km (0.089 R)
• M33: 12,569,063 km (0.091 R)
• M34: 12,746,935 km (0.113 R)
• M35: 12,925,555 km (0.072 R)
• M36: 13,149,952 km (0.099 R)
• M37: 13,968,552 km (0.117 R)
• M38: 14,291,384 km (0.067 R)
• M39: 14,430,510 km (0.094 R)
• M40: 15,559,525 km (0.096 R)
• M41: 17,553,066 km (0.084 R)
• M42: 18,706,316 km (0.105 R)
• M43: 19,062,209 km (0.065 R)
• M44: 19,523,121 km (0.096 R)
• M45: 20,091,293 km (0.09 R)
• M46: 20,822,378 km (0.048 R)
• M47: 21,191,137 km (0.101 R)
• M48: 21,402,818 km (0.114 R)
• M49: 23,503,621 km (0.102 R)
• M50: 24,717,458 km (0.104 R)
• M51: 24,996,159 km (0.118 R)
• M52: 25,163,858 km (0.055 R)
• M53: 26,576,062 km (0.059 R)
• M54: 27,263,165 km (0.097 R)
• M55: 28,362,859 km (0.101 R)
• M56: 28,537,739 km (0.053 R)
• M57: 28,654,575 km (0.084 R)
• M58: 29,064,772 km (0.112 R)
• M59: 29,241,148 km (0.113 R)
• M60: 29,536,005 km (0.048 R)
• M61: 30,128,562 km (0.119 R)
• M62: 30,605,331 km (0.079 R)
• M63: 31,627,084 km (0.101 R)
• M64: 31,929,571 km (0.107 R)
• M65: 34,696,085 km (0.091 R)
• M66: 34,820,700 km (0.115 R)
• M67: 35,572,279 km (0.083 R)
• M68: 36,013,144 km (0.082 R)
• M69: 37,218,903 km (0.119 R)
• M70: 37,282,632 km (0.114 R)
• M71: 38,566,780 km (0.046 R)
• M72: 39,149,464 km (0.067 R)
• M73: 39,734,990 km (0.091 R)
• M74: 40,782,923 km (0.051 R)
• M75: 40,848,746 km (0.089 R)
• M76: 41,376,527 km (0.088 R)
• M77: 41,508,772 km (0.104 R)
• M78: 42,973,185 km (0.072 R)
• M79: 43,442,773 km (0.112 R)
• M80: 43,711,750 km (0.111 R)
• M81: 43,913,857 km (0.083 R)
• M82: 44,319,117 km (0.108 R)
• M83: 45,610,596 km (0.072 R)

Planet 9 - Gas Giant

Semi-Major Axis: 11.49 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 320.8

Radius: 14

Gravity: 1.64 G

Time & Orbit

Eccentricity (e): 0.177

Orbit Range: 9.46 AU - 13.52 AU

Year: 14297 Days

Day: 10.9 Hours

Environment

Temp: -184 °C

Axial Tilt: 37.1 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (60)

Outer Limit: 47,240,721 km

• M1: 252,072 km (0.051 R)
• M2: 495,618 km (0.089 R)
• M3: 764,744 km (0.1 R)
• M4: 3,018,586 km (0.093 R)
• M5: 3,560,878 km (0.056 R)
• M6: 3,828,509 km (0.082 R)
• M7: 4,352,400 km (0.12 R)
• M8: 5,951,901 km (0.025 R)
• M9: 6,704,079 km (0.11 R)
• M10: 7,715,361 km (0.105 R)
• M11: 7,985,385 km (0.1 R)
• M12: 9,423,020 km (0.119 R)
• M13: 10,129,421 km (0.105 R)
• M14: 10,853,026 km (0.111 R)
• M15: 11,947,484 km (0.095 R)
• M16: 12,440,110 km (0.093 R)
• M17: 12,711,630 km (0.091 R)
• M18: 13,214,728 km (0.085 R)
• M19: 13,445,408 km (0.066 R)
• M20: 13,538,159 km (0.09 R)
• M21: 13,677,584 km (0.085 R)
• M22: 14,240,221 km (0.066 R)
• M23: 14,334,767 km (0.062 R)
• M24: 16,665,053 km (0.114 R)
• M25: 17,014,813 km (0.12 R)
• M26: 18,902,888 km (0.065 R)
• M27: 19,163,038 km (0.089 R)
• M28: 19,792,546 km (0.078 R)
• M29: 20,162,801 km (0.098 R)
• M30: 20,322,272 km (0.098 R)
• M31: 21,125,613 km (0.119 R)
• M32: 21,775,765 km (0.101 R)
• M33: 23,877,915 km (0.066 R)
• M34: 24,555,144 km (0.083 R)
• M35: 24,953,074 km (0.115 R)
• M36: 27,150,667 km (0.084 R)
• M37: 27,562,211 km (0.103 R)
• M38: 27,798,276 km (0.056 R)
• M39: 28,332,042 km (0.067 R)
• M40: 29,229,030 km (0.087 R)
• M41: 30,135,444 km (0.064 R)
• M42: 31,604,794 km (0.098 R)
• M43: 33,097,332 km (0.102 R)
• M44: 33,411,188 km (0.072 R)
• M45: 34,231,882 km (0.106 R)
• M46: 34,995,280 km (0.048 R)
• M47: 35,186,915 km (0.104 R)
• M48: 36,086,298 km (0.119 R)
• M49: 36,215,401 km (0.107 R)
• M50: 36,733,458 km (0.036 R)
• M51: 37,318,984 km (0.082 R)
• M52: 41,301,579 km (0.113 R)
• M53: 41,842,674 km (0.11 R)
• M54: 42,250,179 km (0.105 R)
• M55: 42,454,380 km (0.082 R)
• M56: 42,658,880 km (0.085 R)
• M57: 43,205,959 km (0.076 R)
• M58: 44,652,870 km (0.088 R)
• M59: 45,347,453 km (0.091 R)
• M60: 46,536,457 km (0.034 R)

Kuiper Belt

Range: 30 - 58 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 427 - 19,184 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit