🌌 Stone's Star System Generator

Planet 1 - Terrestrial

Semi-Major Axis: 0.6 AU

Status: Inner (Hot)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 0.78

Radius: 0.91

Gravity: 0.94 G

Time & Orbit

Eccentricity (e): 0.042

Orbit Range: 0.57 AU - 0.63 AU

Year: 177 Days

Day: 24.1 Hours

Environment

Temp: 168 °C

Axial Tilt: 26.5 °

Atmosphere: Dense CO₂

Biome: Volcanic/Barren

Planet 2 - Terrestrial

Semi-Major Axis: 0.72 AU

Status: Inner (Hot)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 4.33

Radius: 1.8

Gravity: 1.34 G

Time & Orbit

Eccentricity (e): 0.215

Orbit Range: 0.57 AU - 0.87 AU

Year: 233 Days

Day: 43.3 Hours

Environment

Temp: 117 °C

Axial Tilt: 22.7 °

Atmosphere: Dense CO₂

Biome: Volcanic/Barren

Satellites (2)

Outer Limit: 49,271,622 km

• M1: 76,893 km (0.04 R)
• M2: 214,673 km (0.076 R)

Planet 3 - Terrestrial

Semi-Major Axis: 1.89 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 3.85

Radius: 1.71

Gravity: 1.32 G

Time & Orbit

Eccentricity (e): 0.232

Orbit Range: 1.45 AU - 2.33 AU

Year: 989 Days

Day: 35.5 Hours

Environment

Temp: -72 °C

Axial Tilt: 34.7 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Planet 4 - Terrestrial

Semi-Major Axis: 2.97 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 1.47

Radius: 1.17

Gravity: 1.07 G

Time & Orbit

Eccentricity (e): 0.03

Orbit Range: 2.88 AU - 3.06 AU

Year: 1949 Days

Day: 22.5 Hours

Environment

Temp: -118 °C

Axial Tilt: 13.9 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Satellites (1)

Outer Limit: 49,271,622 km

• M1: 1,697,487 km (0.116 R)

Planet 5 - Terrestrial

Semi-Major Axis: 3.24 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 0.72

Radius: 0.88

Gravity: 0.93 G

Time & Orbit

Eccentricity (e): 0.021

Orbit Range: 3.17 AU - 3.31 AU

Year: 2221 Days

Day: 45.3 Hours

Environment

Temp: -110 °C

Axial Tilt: 42.3 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Planet 6 - Gas Giant

Semi-Major Axis: 4.46 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 883.4

Radius: 9.5

Gravity: 9.79 G

Time & Orbit

Eccentricity (e): 0.145

Orbit Range: 3.81 AU - 5.11 AU

Year: 3587 Days

Day: 11.7 Hours

Environment

Temp: -145 °C

Axial Tilt: 37.3 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (77)

Outer Limit: 49,271,622 km

• M1: 144,362 km (0.08 R)
• M2: 327,919 km (0.053 R)
• M3: 484,398 km (0.113 R)
• M4: 583,132 km (0.093 R)
• M5: 756,516 km (0.097 R)
• M6: 837,898 km (0.117 R)
• M7: 898,036 km (0.045 R)
• M8: 1,023,100 km (0.11 R)
• M9: 1,208,152 km (0.117 R)
• M10: 1,404,275 km (0.066 R)
• M11: 1,656,647 km (0.036 R)
• M12: 2,103,795 km (0.066 R)
• M13: 2,445,776 km (0.069 R)
• M14: 2,551,840 km (0.101 R)
• M15: 2,623,348 km (0.039 R)
• M16: 2,713,855 km (0.119 R)
• M17: 3,143,350 km (0.119 R)
• M18: 3,239,542 km (0.095 R)
• M19: 3,317,333 km (0.087 R)
• M20: 3,574,192 km (0.079 R)
• M21: 4,255,311 km (0.108 R)
• M22: 4,362,124 km (0.118 R)
• M23: 4,534,760 km (0.049 R)
• M24: 5,088,721 km (0.084 R)
• M25: 5,293,371 km (0.118 R)
• M26: 5,687,561 km (0.081 R)
• M27: 5,828,931 km (0.086 R)
• M28: 6,067,241 km (0.118 R)
• M29: 6,357,461 km (0.085 R)
• M30: 6,652,169 km (0.081 R)
• M31: 6,926,232 km (0.059 R)
• M32: 7,459,997 km (0.042 R)
• M33: 7,588,950 km (0.072 R)
• M34: 7,875,430 km (0.036 R)
• M35: 8,485,939 km (0.077 R)
• M36: 9,221,961 km (0.1 R)
• M37: 9,416,139 km (0.081 R)
• M38: 9,555,714 km (0.091 R)
• M39: 9,780,410 km (0.081 R)
• M40: 10,120,745 km (0.101 R)
• M41: 10,609,631 km (0.062 R)
• M42: 10,813,084 km (0.041 R)
• M43: 10,959,241 km (0.118 R)
• M44: 11,194,558 km (0.108 R)
• M45: 11,580,371 km (0.069 R)
• M46: 11,700,049 km (0.115 R)
• M47: 11,940,453 km (0.115 R)
• M48: 12,182,503 km (0.119 R)
• M49: 12,395,680 km (0.07 R)
• M50: 12,610,053 km (0.087 R)
• M51: 12,949,491 km (0.074 R)
• M52: 13,167,156 km (0.119 R)
• M53: 13,542,946 km (0.083 R)
• M54: 14,853,423 km (0.108 R)
• M55: 15,310,145 km (0.119 R)
• M56: 15,375,669 km (0.088 R)
• M57: 15,970,470 km (0.106 R)
• M58: 16,037,041 km (0.11 R)
• M59: 16,270,713 km (0.089 R)
• M60: 16,674,029 km (0.079 R)
• M61: 17,114,595 km (0.111 R)
• M62: 17,972,688 km (0.11 R)
• M63: 18,284,899 km (0.106 R)
• M64: 18,354,612 km (0.084 R)
• M65: 18,669,066 km (0.051 R)
• M66: 19,126,537 km (0.089 R)
• M67: 19,658,955 km (0.106 R)
• M68: 19,944,987 km (0.12 R)
• M69: 20,376,427 km (0.052 R)
• M70: 22,133,304 km (0.117 R)
• M71: 22,992,146 km (0.114 R)
• M72: 23,180,340 km (0.113 R)
• M73: 23,331,134 km (0.085 R)
• M74: 24,052,346 km (0.106 R)
• M75: 24,473,314 km (0.088 R)
• M76: 24,550,058 km (0.12 R)
• M77: 26,299,006 km (0.085 R)

Planet 7 - Gas Giant

Semi-Major Axis: 9.92 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 338.7

Radius: 8

Gravity: 5.29 G

Time & Orbit

Eccentricity (e): 0.097

Orbit Range: 8.96 AU - 10.88 AU

Year: 11898 Days

Day: 10.4 Hours

Environment

Temp: -185 °C

Axial Tilt: 35.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (87)

Outer Limit: 49,271,622 km

• M1: 100,829 km (0.096 R)
• M2: 177,423 km (0.1 R)
• M3: 228,735 km (0.082 R)
• M4: 287,826 km (0.044 R)
• M5: 377,435 km (0.094 R)
• M6: 439,219 km (0.105 R)
• M7: 692,638 km (0.088 R)
• M8: 770,878 km (0.108 R)
• M9: 902,674 km (0.085 R)
• M10: 954,135 km (0.119 R)
• M11: 1,024,446 km (0.049 R)
• M12: 1,284,298 km (0.058 R)
• M13: 1,382,135 km (0.094 R)
• M14: 1,648,569 km (0.083 R)
• M15: 2,089,583 km (0.069 R)
• M16: 2,615,569 km (0.104 R)
• M17: 2,665,385 km (0.119 R)
• M18: 2,919,402 km (0.082 R)
• M19: 2,997,044 km (0.065 R)
• M20: 3,181,199 km (0.117 R)
• M21: 3,588,105 km (0.05 R)
• M22: 3,755,655 km (0.113 R)
• M23: 4,844,129 km (0.043 R)
• M24: 5,631,313 km (0.074 R)
• M25: 5,761,014 km (0.112 R)
• M26: 6,089,381 km (0.066 R)
• M27: 6,155,803 km (0.099 R)
• M28: 6,289,394 km (0.076 R)
• M29: 6,390,223 km (0.109 R)
• M30: 7,321,769 km (0.088 R)
• M31: 7,713,416 km (0.065 R)
• M32: 7,821,425 km (0.105 R)
• M33: 8,295,202 km (0.117 R)
• M34: 9,118,140 km (0.087 R)
• M35: 9,539,407 km (0.107 R)
• M36: 10,006,153 km (0.08 R)
• M37: 10,124,036 km (0.095 R)
• M38: 11,205,329 km (0.092 R)
• M39: 11,327,850 km (0.101 R)
• M40: 12,661,066 km (0.087 R)
• M41: 12,831,159 km (0.056 R)
• M42: 12,959,215 km (0.069 R)
• M43: 13,130,654 km (0.044 R)
• M44: 13,259,757 km (0.086 R)
• M45: 14,263,409 km (0.057 R)
• M46: 14,529,394 km (0.086 R)
• M47: 15,156,059 km (0.088 R)
• M48: 15,291,446 km (0.079 R)
• M49: 16,854,295 km (0.118 R)
• M50: 16,994,767 km (0.101 R)
• M51: 17,559,948 km (0.069 R)
• M52: 17,797,210 km (0.12 R)
• M53: 17,940,225 km (0.101 R)
• M54: 20,079,774 km (0.066 R)
• M55: 20,327,957 km (0.1 R)
• M56: 21,482,703 km (0.106 R)
• M57: 22,144,823 km (0.116 R)
• M58: 22,968,958 km (0.049 R)
• M59: 23,332,630 km (0.059 R)
• M60: 23,960,493 km (0.079 R)
• M61: 24,540,932 km (0.096 R)
• M62: 25,393,491 km (0.098 R)
• M63: 25,500,752 km (0.116 R)
• M64: 26,093,309 km (0.108 R)
• M65: 28,008,910 km (0.037 R)
• M66: 28,064,261 km (0.113 R)
• M67: 28,675,967 km (0.092 R)
• M68: 29,348,409 km (0.12 R)
• M69: 29,573,704 km (0.088 R)
• M70: 29,856,145 km (0.059 R)
• M71: 30,196,181 km (0.097 R)
• M72: 31,224,068 km (0.108 R)
• M73: 32,437,755 km (0.043 R)
• M74: 32,554,142 km (0.079 R)
• M75: 33,138,172 km (0.107 R)
• M76: 33,255,457 km (0.1 R)
• M77: 35,329,183 km (0.109 R)
• M78: 35,748,954 km (0.069 R)
• M79: 36,110,084 km (0.082 R)
• M80: 36,835,932 km (0.108 R)
• M81: 36,957,256 km (0.118 R)
• M82: 37,018,143 km (0.08 R)
• M83: 38,117,687 km (0.11 R)
• M84: 39,476,185 km (0.114 R)
• M85: 39,911,665 km (0.057 R)
• M86: 41,480,198 km (0.1 R)
• M87: 42,367,314 km (0.086 R)

Planet 8 - Gas Giant

Semi-Major Axis: 10.67 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 523.2

Radius: 14.8

Gravity: 2.39 G

Time & Orbit

Eccentricity (e): 0.072

Orbit Range: 9.9 AU - 11.44 AU

Year: 13272 Days

Day: 12.2 Hours

Environment

Temp: -186 °C

Axial Tilt: 44.1 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (69)

Outer Limit: 49,271,622 km

• M1: 192,682 km (0.106 R)
• M2: 356,193 km (0.092 R)
• M3: 637,885 km (0.06 R)
• M4: 773,571 km (0.104 R)
• M5: 1,057,956 km (0.062 R)
• M6: 1,202,767 km (0.073 R)
• M7: 1,422,227 km (0.105 R)
• M8: 1,777,073 km (0.054 R)
• M9: 2,081,654 km (0.118 R)
• M10: 2,294,383 km (0.109 R)
• M11: 2,570,690 km (0.066 R)
• M12: 2,799,724 km (0.064 R)
• M13: 2,946,330 km (0.069 R)
• M14: 3,095,629 km (0.09 R)
• M15: 4,516,809 km (0.115 R)
• M16: 5,812,027 km (0.041 R)
• M17: 6,815,081 km (0.118 R)
• M18: 8,419,219 km (0.057 R)
• M19: 8,719,162 km (0.12 R)
• M20: 9,285,689 km (0.043 R)
• M21: 9,729,546 km (0.11 R)
• M22: 10,454,348 km (0.1 R)
• M23: 11,290,600 km (0.114 R)
• M24: 12,245,035 km (0.107 R)
• M25: 13,825,536 km (0.098 R)
• M26: 13,977,079 km (0.106 R)
• M27: 14,129,070 km (0.085 R)
• M28: 15,417,407 km (0.098 R)
• M29: 16,421,657 km (0.07 R)
• M30: 17,338,094 km (0.09 R)
• M31: 18,715,890 km (0.111 R)
• M32: 19,333,281 km (0.119 R)
• M33: 19,786,562 km (0.107 R)
• M34: 19,957,403 km (0.108 R)
• M35: 20,876,981 km (0.051 R)
• M36: 21,050,964 km (0.103 R)
• M37: 21,751,680 km (0.106 R)
• M38: 22,757,426 km (0.112 R)
• M39: 23,839,019 km (0.082 R)
• M40: 24,264,027 km (0.05 R)
• M41: 24,875,732 km (0.089 R)
• M42: 25,616,391 km (0.059 R)
• M43: 28,009,658 km (0.117 R)
• M44: 28,265,770 km (0.105 R)
• M45: 29,818,446 km (0.091 R)
• M46: 31,465,070 km (0.085 R)
• M47: 33,006,077 km (0.074 R)
• M48: 34,777,615 km (0.104 R)
• M49: 37,421,907 km (0.065 R)
• M50: 37,562,829 km (0.105 R)
• M51: 38,199,367 km (0.114 R)
• M52: 38,554,513 km (0.075 R)
• M53: 38,696,930 km (0.09 R)
• M54: 38,982,213 km (0.084 R)
• M55: 39,339,752 km (0.119 R)
• M56: 39,483,067 km (0.09 R)
• M57: 39,626,681 km (0.114 R)
• M58: 41,508,173 km (0.087 R)
• M59: 43,196,684 km (0.079 R)
• M60: 43,418,538 km (0.082 R)
• M61: 43,863,592 km (0.11 R)
• M62: 45,432,724 km (0.107 R)
• M63: 45,884,509 km (0.049 R)
• M64: 47,553,573 km (0.042 R)
• M65: 48,242,172 km (0.07 R)
• M66: 48,549,147 km (0.097 R)
• M67: 48,933,912 km (0.059 R)
• M68: 49,088,148 km (0.099 R)
• M69: 51,263,750 km (0.082 R)

Planet 9 - Ice Giant

Semi-Major Axis: 13.48 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 506.4

Radius: 8

Gravity: 7.91 G

Time & Orbit

Eccentricity (e): 0.149

Orbit Range: 11.47 AU - 15.49 AU

Year: 18847 Days

Day: 22 Hours

Environment

Temp: -195 °C

Axial Tilt: 10.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (88)

Outer Limit: 49,271,622 km

• M1: 105,466 km (0.118 R)
• M2: 258,954 km (0.086 R)
• M3: 729,738 km (0.117 R)
• M4: 793,916 km (0.08 R)
• M5: 951,143 km (0.112 R)
• M6: 2,125,187 km (0.085 R)
• M7: 2,775,938 km (0.104 R)
• M8: 2,878,712 km (0.059 R)
• M9: 3,158,759 km (0.093 R)
• M10: 3,338,276 km (0.035 R)
• M11: 4,727,592 km (0.112 R)
• M12: 5,058,203 km (0.09 R)
• M13: 5,353,509 km (0.099 R)
• M14: 5,785,249 km (0.115 R)
• M15: 6,820,317 km (0.081 R)
• M16: 7,052,792 km (0.091 R)
• M17: 7,146,589 km (0.058 R)
• M18: 7,382,805 km (0.098 R)
• M19: 8,353,096 km (0.095 R)
• M20: 8,853,202 km (0.063 R)
• M21: 9,260,407 km (0.11 R)
• M22: 9,414,643 km (0.076 R)
• M23: 9,466,254 km (0.102 R)
• M24: 9,987,453 km (0.084 R)
• M25: 10,464,670 km (0.1 R)
• M26: 11,112,279 km (0.088 R)
• M27: 11,386,044 km (0.084 R)
• M28: 11,661,902 km (0.084 R)
• M29: 11,884,354 km (0.101 R)
• M30: 12,052,053 km (0.097 R)
• M31: 12,164,252 km (0.099 R)
• M32: 12,446,393 km (0.089 R)
• M33: 12,616,636 km (0.116 R)
• M34: 12,787,776 km (0.112 R)
• M35: 12,959,514 km (0.088 R)
• M36: 15,141,249 km (0.106 R)
• M37: 15,201,687 km (0.119 R)
• M38: 15,444,634 km (0.049 R)
• M39: 15,627,742 km (0.119 R)
• M40: 17,688,303 km (0.11 R)
• M41: 17,879,788 km (0.072 R)
• M42: 20,699,708 km (0.11 R)
• M43: 21,443,060 km (0.082 R)
• M44: 21,579,044 km (0.111 R)
• M45: 22,057,608 km (0.116 R)
• M46: 22,608,876 km (0.055 R)
• M47: 22,886,230 km (0.066 R)
• M48: 23,164,632 km (0.049 R)
• M49: 23,725,026 km (0.072 R)
• M50: 23,936,258 km (0.094 R)
• M51: 25,793,066 km (0.102 R)
• M52: 26,446,660 km (0.063 R)
• M53: 26,665,671 km (0.106 R)
• M54: 26,885,281 km (0.104 R)
• M55: 27,105,638 km (0.104 R)
• M56: 27,547,849 km (0.11 R)
• M57: 27,621,900 km (0.085 R)
• M58: 28,514,401 km (0.092 R)
• M59: 29,265,532 km (0.102 R)
• M60: 29,870,955 km (0.112 R)
• M61: 30,633,754 km (0.028 R)
• M62: 30,863,686 km (0.112 R)
• M63: 34,064,931 km (0.113 R)
• M64: 36,554,539 km (0.101 R)
• M65: 36,798,533 km (0.046 R)
• M66: 39,601,848 km (0.083 R)
• M67: 42,216,968 km (0.06 R)
• M68: 45,148,637 km (0.066 R)
• M69: 45,672,828 km (0.099 R)
• M70: 46,903,720 km (0.111 R)
• M71: 49,218,447 km (0.114 R)
• M72: 49,577,931 km (0.113 R)
• M73: 50,299,292 km (0.118 R)
• M74: 50,389,799 km (0.053 R)
• M75: 54,236,110 km (0.097 R)
• M76: 54,793,212 km (0.116 R)
• M77: 54,886,262 km (0.057 R)
• M78: 56,006,900 km (0.105 R)
• M79: 56,664,083 km (0.114 R)
• M80: 57,040,771 km (0.101 R)
• M81: 58,365,609 km (0.119 R)
• M82: 59,031,918 km (0.105 R)
• M83: 59,509,285 km (0.12 R)
• M84: 63,765,793 km (0.07 R)
• M85: 64,353,713 km (0.039 R)
• M86: 65,140,598 km (0.08 R)
• M87: 65,831,590 km (0.09 R)
• M88: 66,128,542 km (0.114 R)

Planet 10 - Ice Giant

Semi-Major Axis: 14.5 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 168.3

Radius: 3.5

Gravity: 13.74 G

Time & Orbit

Eccentricity (e): 0.096

Orbit Range: 13.11 AU - 15.89 AU

Year: 21026 Days

Day: 15.9 Hours

Environment

Temp: -193 °C

Axial Tilt: 2.4 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (65)

Outer Limit: 49,271,622 km

• M1: 143,165 km (0.09 R)
• M2: 422,614 km (0.052 R)
• M3: 1,199,476 km (0.097 R)
• M4: 2,350,931 km (0.11 R)
• M5: 2,622,301 km (0.07 R)
• M6: 2,761,577 km (0.071 R)
• M7: 2,789,851 km (0.049 R)
• M8: 4,380,674 km (0.116 R)
• M9: 4,814,807 km (0.096 R)
• M10: 5,262,554 km (0.11 R)
• M11: 5,831,475 km (0.084 R)
• M12: 5,940,382 km (0.099 R)
• M13: 6,308,093 km (0.085 R)
• M14: 6,835,276 km (0.096 R)
• M15: 7,771,310 km (0.065 R)
• M16: 8,011,564 km (0.116 R)
• M17: 9,080,441 km (0.059 R)
• M18: 10,324,347 km (0.097 R)
• M19: 10,721,081 km (0.051 R)
• M20: 10,899,102 km (0.095 R)
• M21: 11,711,868 km (0.084 R)
• M22: 12,544,081 km (0.1 R)
• M23: 12,684,703 km (0.105 R)
• M24: 13,538,757 km (0.061 R)
• M25: 13,875,950 km (0.079 R)
• M26: 14,118,449 km (0.045 R)
• M27: 14,657,001 km (0.088 R)
• M28: 15,653,173 km (0.118 R)
• M29: 16,465,639 km (0.073 R)
• M30: 17,448,348 km (0.115 R)
• M31: 17,552,767 km (0.077 R)
• M32: 18,662,933 km (0.085 R)
• M33: 19,091,830 km (0.099 R)
• M34: 20,618,027 km (0.102 R)
• M35: 21,844,580 km (0.07 R)
• M36: 23,612,528 km (0.114 R)
• M37: 24,076,132 km (0.036 R)
• M38: 24,484,235 km (0.084 R)
• M39: 24,835,939 km (0.091 R)
• M40: 26,499,019 km (0.106 R)
• M41: 27,222,624 km (0.09 R)
• M42: 27,952,811 km (0.103 R)
• M43: 28,936,417 km (0.057 R)
• M44: 29,494,567 km (0.037 R)
• M45: 29,681,414 km (0.088 R)
• M46: 29,931,243 km (0.109 R)
• M47: 32,531,104 km (0.083 R)
• M48: 32,595,431 km (0.102 R)
• M49: 34,675,590 km (0.03 R)
• M50: 39,578,660 km (0.105 R)
• M51: 39,715,991 km (0.078 R)
• M52: 41,516,102 km (0.11 R)
• M53: 41,655,527 km (0.062 R)
• M54: 41,865,263 km (0.113 R)
• M55: 41,935,126 km (0.088 R)
• M56: 42,005,137 km (0.073 R)
• M57: 42,145,311 km (0.086 R)
• M58: 42,636,889 km (0.074 R)
• M59: 44,765,068 km (0.112 R)
• M60: 44,836,726 km (0.1 R)
• M61: 45,626,004 km (0.083 R)
• M62: 46,203,003 km (0.099 R)
• M63: 48,094,818 km (0.1 R)
• M64: 48,388,179 km (0.095 R)
• M65: 48,755,592 km (0.076 R)

Kuiper Belt

Range: 30 - 51 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 518 - 14,909 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit