🌌 Stone's Star System Generator

Planet 1 - Terrestrial

Semi-Major Axis: 0.59 AU

Status: Inner (Hot)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 0.75

Radius: 0.89

Gravity: 0.95 G

Time & Orbit

Eccentricity (e): 0.11

Orbit Range: 0.53 AU - 0.65 AU

Year: 164 Days

Day: 16.4 Hours

Environment

Temp: 174 °C

Axial Tilt: 38.9 °

Atmosphere: Dense CO₂

Biome: Volcanic/Barren

Planet 2 - Terrestrial

Semi-Major Axis: 1.07 AU

Status: HZ

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 4.52

Radius: 1.83

Gravity: 1.35 G

Time & Orbit

Eccentricity (e): 0.127

Orbit Range: 0.93 AU - 1.21 AU

Year: 400 Days

Day: 19.3 Hours

Environment

Temp: 16 °C

Axial Tilt: 18.3 °

Atmosphere: N₂, O₂

Biome: Arid/Tundra

Planet 3 - Terrestrial

Semi-Major Axis: 2.95 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 3.07

Radius: 1.57

Gravity: 1.25 G

Time & Orbit

Eccentricity (e): 0.204

Orbit Range: 2.35 AU - 3.55 AU

Year: 1832 Days

Day: 35 Hours

Environment

Temp: -91 °C

Axial Tilt: 20.6 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Planet 4 - Terrestrial

Semi-Major Axis: 3.62 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 2.18

Radius: 1.37

Gravity: 1.16 G

Time & Orbit

Eccentricity (e): 0.077

Orbit Range: 3.34 AU - 3.9 AU

Year: 2491 Days

Day: 21.3 Hours

Environment

Temp: -113 °C

Axial Tilt: 15.4 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Satellites (1)

Outer Limit: 53,668,002 km

• M1: 74,500 km (0.085 R)

Planet 5 - Terrestrial

Semi-Major Axis: 4.07 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 3.16

Radius: 1.58

Gravity: 1.27 G

Time & Orbit

Eccentricity (e): 0.015

Orbit Range: 4.01 AU - 4.13 AU

Year: 2969 Days

Day: 20.4 Hours

Environment

Temp: -113 °C

Axial Tilt: 35.4 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Asteroid Belt

Center: 5.74 AU

Composition

Type: Main (Rocky/Icy Mix)

A dense region of planetesimals and debris.

Boundary

Planet 6 - Gas Giant

Semi-Major Axis: 7.41 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 36.8

Radius: 11.7

Gravity: 0.27 G

Time & Orbit

Eccentricity (e): 0.049

Orbit Range: 7.05 AU - 7.77 AU

Year: 7295 Days

Day: 8.6 Hours

Environment

Temp: -168 °C

Axial Tilt: 18 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (49)

Outer Limit: 53,668,002 km

• M1: 189,690 km (0.083 R)
• M2: 322,533 km (0.041 R)
• M3: 704,008 km (0.07 R)
• M4: 825,631 km (0.081 R)
• M5: 988,543 km (0.098 R)
• M6: 1,356,853 km (0.118 R)
• M7: 1,581,997 km (0.106 R)
• M8: 2,069,238 km (0.09 R)
• M9: 2,388,330 km (0.113 R)
• M10: 2,638,009 km (0.096 R)
• M11: 2,784,615 km (0.095 R)
• M12: 2,933,913 km (0.116 R)
• M13: 3,047,757 km (0.062 R)
• M14: 3,188,978 km (0.12 R)
• M15: 3,424,594 km (0.11 R)
• M16: 3,612,041 km (0.109 R)
• M17: 4,265,783 km (0.094 R)
• M18: 4,525,934 km (0.089 R)
• M19: 4,791,321 km (0.078 R)
• M20: 4,910,999 km (0.104 R)
• M21: 5,649,713 km (0.067 R)
• M22: 5,728,701 km (0.026 R)
• M23: 5,887,723 km (0.084 R)
• M24: 6,161,488 km (0.065 R)
• M25: 6,275,481 km (0.085 R)
• M26: 6,571,834 km (0.082 R)
• M27: 6,688,371 km (0.101 R)
• M28: 7,662,403 km (0.116 R)
• M29: 7,802,726 km (0.097 R)
• M30: 7,926,144 km (0.119 R)
• M31: 8,937,126 km (0.101 R)
• M32: 9,103,330 km (0.046 R)
• M33: 9,326,679 km (0.116 R)
• M34: 9,627,221 km (0.113 R)
• M35: 9,778,764 km (0.089 R)
• M36: 9,912,056 km (0.04 R)
• M37: 10,353,968 km (0.04 R)
• M38: 10,626,236 km (0.078 R)
• M39: 11,597,575 km (0.086 R)
• M40: 11,779,037 km (0.074 R)
• M41: 11,900,660 km (0.074 R)
• M42: 12,002,237 km (0.097 R)
• M43: 12,288,268 km (0.042 R)
• M44: 12,432,181 km (0.088 R)
• M45: 13,117,938 km (0.057 R)
• M46: 13,349,216 km (0.061 R)
• M47: 13,560,748 km (0.069 R)
• M48: 13,879,990 km (0.081 R)
• M49: 14,569,486 km (0.074 R)

Planet 7 - Gas Giant

Semi-Major Axis: 10.46 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 849.2

Radius: 8.8

Gravity: 10.97 G

Time & Orbit

Eccentricity (e): 0.061

Orbit Range: 9.82 AU - 11.1 AU

Year: 12235 Days

Day: 13.2 Hours

Environment

Temp: -166 °C

Axial Tilt: 27.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (89)

Outer Limit: 53,668,002 km

• M1: 239,805 km (0.06 R)
• M2: 314,455 km (0.098 R)
• M3: 615,446 km (0.112 R)
• M4: 1,198,279 km (0.095 R)
• M5: 1,414,897 km (0.106 R)
• M6: 2,492,600 km (0.119 R)
• M7: 2,676,605 km (0.042 R)
• M8: 3,355,630 km (0.082 R)
• M9: 3,423,098 km (0.086 R)
• M10: 4,014,160 km (0.074 R)
• M11: 4,157,923 km (0.108 R)
• M12: 4,599,237 km (0.118 R)
• M13: 4,674,335 km (0.059 R)
• M14: 4,978,617 km (0.094 R)
• M15: 5,289,332 km (0.076 R)
• M16: 6,426,126 km (0.111 R)
• M17: 6,978,890 km (0.054 R)
• M18: 8,084,419 km (0.114 R)
• M19: 8,175,224 km (0.11 R)
• M20: 9,291,075 km (0.113 R)
• M21: 9,433,941 km (0.1 R)
• M22: 11,103,154 km (0.119 R)
• M23: 11,611,338 km (0.091 R)
• M24: 14,099,599 km (0.107 R)
• M25: 14,649,521 km (0.109 R)
• M26: 14,760,373 km (0.098 R)
• M27: 16,861,026 km (0.112 R)
• M28: 18,034,921 km (0.088 R)
• M29: 18,571,828 km (0.097 R)
• M30: 18,872,370 km (0.11 R)
• M31: 20,399,016 km (0.09 R)
• M32: 21,333,853 km (0.115 R)
• M33: 23,959,745 km (0.035 R)
• M34: 24,090,493 km (0.12 R)
• M35: 24,747,527 km (0.046 R)
• M36: 24,813,500 km (0.106 R)
• M37: 26,146,267 km (0.092 R)
• M38: 26,483,161 km (0.085 R)
• M39: 26,685,867 km (0.045 R)
• M40: 26,753,634 km (0.076 R)
• M41: 27,093,072 km (0.086 R)
• M42: 27,365,639 km (0.093 R)
• M43: 27,433,856 km (0.099 R)
• M44: 27,502,222 km (0.111 R)
• M45: 29,368,755 km (0.108 R)
• M46: 29,578,641 km (0.087 R)
• M47: 30,140,829 km (0.117 R)
• M48: 31,633,367 km (0.098 R)
• M49: 31,848,489 km (0.115 R)
• M50: 32,786,617 km (0.065 R)
• M51: 33,514,411 km (0.037 R)
• M52: 33,660,568 km (0.106 R)
• M53: 34,026,933 km (0.09 R)
• M54: 35,282,658 km (0.047 R)
• M55: 35,431,358 km (0.119 R)
• M56: 35,953,455 km (0.116 R)
• M57: 36,553,342 km (0.099 R)
• M58: 38,602,384 km (0.093 R)
• M59: 39,062,697 km (0.113 R)
• M60: 39,293,676 km (0.097 R)
• M61: 39,524,954 km (0.071 R)
• M62: 39,834,023 km (0.103 R)
• M63: 39,989,007 km (0.102 R)
• M64: 41,000,588 km (0.077 R)
• M65: 41,705,792 km (0.112 R)
• M66: 41,784,331 km (0.087 R)
• M67: 41,863,019 km (0.112 R)
• M68: 42,573,160 km (0.07 R)
• M69: 43,685,720 km (0.108 R)
• M70: 43,845,341 km (0.097 R)
• M71: 44,085,296 km (0.118 R)
• M72: 44,405,884 km (0.1 R)
• M73: 46,508,632 km (0.105 R)
• M74: 49,639,715 km (0.112 R)
• M75: 49,806,517 km (0.059 R)
• M76: 50,307,670 km (0.103 R)
• M77: 50,391,295 km (0.084 R)
• M78: 52,159,392 km (0.08 R)
• M79: 53,434,714 km (0.062 R)
• M80: 53,776,545 km (0.06 R)
• M81: 54,462,451 km (0.05 R)
• M82: 55,583,089 km (0.08 R)
• M83: 56,537,224 km (0.085 R)
• M84: 57,060,069 km (0.072 R)
• M85: 57,847,103 km (0.114 R)
• M86: 58,022,581 km (0.06 R)
• M87: 58,286,023 km (0.106 R)
• M88: 58,373,837 km (0.054 R)
• M89: 58,637,877 km (0.064 R)

Planet 8 - Ice Giant

Semi-Major Axis: 13.9 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 806.4

Radius: 7.4

Gravity: 14.73 G

Time & Orbit

Eccentricity (e): 0.213

Orbit Range: 10.94 AU - 16.86 AU

Year: 18742 Days

Day: 20.3 Hours

Environment

Temp: -177 °C

Axial Tilt: 15.8 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (93)

Outer Limit: 53,668,002 km

• M1: 247,584 km (0.099 R)
• M2: 825,631 km (0.117 R)
• M3: 925,562 km (0.055 R)
• M4: 1,110,315 km (0.09 R)
• M5: 1,670,410 km (0.035 R)
• M6: 2,413,462 km (0.116 R)
• M7: 2,743,924 km (0.113 R)
• M8: 2,972,360 km (0.059 R)
• M9: 3,049,852 km (0.095 R)
• M10: 4,247,383 km (0.108 R)
• M11: 4,556,302 km (0.117 R)
• M12: 4,735,969 km (0.065 R)
• M13: 5,102,484 km (0.078 R)
• M14: 5,669,460 km (0.06 R)
• M15: 5,814,271 km (0.118 R)
• M16: 6,405,930 km (0.077 R)
• M17: 8,075,592 km (0.049 R)
• M18: 9,582,492 km (0.103 R)
• M19: 10,045,347 km (0.059 R)
• M20: 11,113,327 km (0.111 R)
• M21: 11,173,764 km (0.05 R)
• M22: 11,294,938 km (0.075 R)
• M23: 12,030,661 km (0.118 R)
• M24: 12,529,869 km (0.086 R)
• M25: 12,592,700 km (0.037 R)
• M26: 14,132,810 km (0.098 R)
• M27: 14,659,395 km (0.059 R)
• M28: 15,393,770 km (0.108 R)
• M29: 15,596,176 km (0.093 R)
• M30: 16,898,127 km (0.086 R)
• M31: 17,106,965 km (0.088 R)
• M32: 17,176,678 km (0.073 R)
• M33: 18,449,008 km (0.12 R)
• M34: 20,118,221 km (0.045 R)
• M35: 20,265,724 km (0.107 R)
• M36: 20,339,476 km (0.097 R)
• M37: 20,413,527 km (0.091 R)
• M38: 23,598,765 km (0.104 R)
• M39: 23,832,138 km (0.116 R)
• M40: 23,988,168 km (0.112 R)
• M41: 24,144,498 km (0.053 R)
• M42: 24,301,277 km (0.116 R)
• M43: 25,248,381 km (0.119 R)
• M44: 25,806,530 km (0.093 R)
• M45: 26,691,850 km (0.118 R)
• M46: 28,492,111 km (0.103 R)
• M47: 30,246,745 km (0.112 R)
• M48: 31,009,395 km (0.111 R)
• M49: 31,094,516 km (0.112 R)
• M50: 31,521,468 km (0.037 R)
• M51: 32,813,545 km (0.106 R)
• M52: 32,900,312 km (0.076 R)
• M53: 32,987,078 km (0.112 R)
• M54: 34,563,092 km (0.089 R)
• M55: 35,627,331 km (0.086 R)
• M56: 36,972,665 km (0.069 R)
• M57: 37,424,899 km (0.104 R)
• M58: 37,697,018 km (0.081 R)
• M59: 38,152,095 km (0.103 R)
• M60: 39,712,999 km (0.114 R)
• M61: 39,898,051 km (0.106 R)
• M62: 41,107,400 km (0.104 R)
• M63: 41,669,739 km (0.037 R)
• M64: 42,612,505 km (0.106 R)
• M65: 44,231,303 km (0.1 R)
• M66: 44,711,363 km (0.079 R)
• M67: 45,386,049 km (0.077 R)
• M68: 45,967,237 km (0.097 R)
• M69: 52,215,641 km (0.079 R)
• M70: 52,316,919 km (0.059 R)
• M71: 54,254,211 km (0.078 R)
• M72: 55,180,072 km (0.097 R)
• M73: 55,800,155 km (0.03 R)
• M74: 56,111,169 km (0.12 R)
• M75: 56,214,841 km (0.078 R)
• M76: 56,630,573 km (0.112 R)
• M77: 58,198,658 km (0.082 R)
• M78: 59,675,039 km (0.075 R)
• M79: 61,163,688 km (0.116 R)
• M80: 61,484,276 km (0.043 R)
• M81: 62,127,098 km (0.085 R)
• M82: 62,341,921 km (0.066 R)
• M83: 66,908,844 km (0.071 R)
• M84: 68,344,236 km (0.11 R)
• M85: 69,343,849 km (0.049 R)
• M86: 71,020,542 km (0.089 R)
• M87: 71,469,934 km (0.068 R)
• M88: 71,807,576 km (0.092 R)
• M89: 73,276,927 km (0.105 R)
• M90: 73,731,106 km (0.05 R)
• M91: 73,958,495 km (0.081 R)
• M92: 74,642,007 km (0.094 R)
• M93: 75,213,321 km (0.094 R)

Planet 9 - Ice Giant

Semi-Major Axis: 15.19 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 58.4

Radius: 4.5

Gravity: 2.88 G

Time & Orbit

Eccentricity (e): 0.137

Orbit Range: 13.11 AU - 17.27 AU

Year: 21410 Days

Day: 18.9 Hours

Environment

Temp: -190 °C

Axial Tilt: 23.1 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (88)

Outer Limit: 53,668,002 km

• M1: 96,341 km (0.088 R)
• M2: 357,090 km (0.044 R)
• M3: 458,966 km (0.078 R)
• M4: 1,016,518 km (0.095 R)
• M5: 1,080,545 km (0.108 R)
• M6: 1,129,314 km (0.109 R)
• M7: 2,109,031 km (0.067 R)
• M8: 2,295,280 km (0.103 R)
• M9: 2,465,223 km (0.091 R)
• M10: 2,953,660 km (0.043 R)
• M11: 2,999,587 km (0.063 R)
• M12: 3,068,851 km (0.098 R)
• M13: 3,940,558 km (0.117 R)
• M14: 4,169,741 km (0.07 R)
• M15: 4,455,922 km (0.08 R)
• M16: 4,802,092 km (0.082 R)
• M17: 5,184,613 km (0.088 R)
• M18: 5,407,514 km (0.09 R)
• M19: 6,124,387 km (0.099 R)
• M20: 6,271,292 km (0.102 R)
• M21: 6,300,763 km (0.106 R)
• M22: 6,330,383 km (0.074 R)
• M23: 6,538,624 km (0.093 R)
• M24: 6,688,820 km (0.103 R)
• M25: 6,870,581 km (0.1 R)
• M26: 6,961,986 km (0.046 R)
• M27: 7,898,768 km (0.056 R)
• M28: 8,058,688 km (0.106 R)
• M29: 8,155,178 km (0.097 R)
• M30: 8,544,881 km (0.078 R)
• M31: 9,107,518 km (0.077 R)
• M32: 9,477,773 km (0.102 R)
• M33: 9,887,372 km (0.091 R)
• M34: 10,163,679 km (0.042 R)
• M35: 10,337,662 km (0.089 R)
• M36: 10,653,313 km (0.046 R)
• M37: 10,688,618 km (0.12 R)
• M38: 11,114,823 km (0.055 R)
• M39: 11,764,526 km (0.114 R)
• M40: 12,020,488 km (0.098 R)
• M41: 12,612,447 km (0.118 R)
• M42: 12,724,496 km (0.069 R)
• M43: 13,327,674 km (0.099 R)
• M44: 13,709,448 km (0.094 R)
• M45: 13,940,128 km (0.112 R)
• M46: 14,094,812 km (0.027 R)
• M47: 14,249,945 km (0.086 R)
• M48: 14,679,441 km (0.088 R)
• M49: 14,876,012 km (0.117 R)
• M50: 15,192,412 km (0.076 R)
• M51: 15,591,090 km (0.11 R)
• M52: 15,831,943 km (0.089 R)
• M53: 16,155,074 km (0.12 R)
• M54: 16,358,078 km (0.099 R)
• M55: 17,844,483 km (0.116 R)
• M56: 18,901,990 km (0.05 R)
• M57: 19,030,196 km (0.045 R)
• M58: 19,158,700 km (0.101 R)
• M59: 19,416,607 km (0.033 R)
• M60: 19,719,094 km (0.075 R)
• M61: 21,298,698 km (0.105 R)
• M62: 21,744,649 km (0.088 R)
• M63: 22,645,826 km (0.098 R)
• M64: 22,872,916 km (0.116 R)
• M65: 23,375,415 km (0.062 R)
• M66: 23,558,972 km (0.113 R)
• M67: 24,251,909 km (0.111 R)
• M68: 24,577,434 km (0.084 R)
• M69: 25,139,025 km (0.038 R)
• M70: 25,421,316 km (0.094 R)
• M71: 26,131,906 km (0.044 R)
• M72: 26,513,380 km (0.095 R)
• M73: 26,848,779 km (0.109 R)
• M74: 28,448,877 km (0.06 R)
• M75: 29,186,395 km (0.112 R)
• M76: 29,285,130 km (0.068 R)
• M77: 29,384,014 km (0.069 R)
• M78: 29,582,231 km (0.049 R)
• M79: 29,830,563 km (0.087 R)
• M80: 31,588,189 km (0.105 R)
• M81: 31,791,193 km (0.116 R)
• M82: 32,351,587 km (0.115 R)
• M83: 32,761,335 km (0.112 R)
• M84: 32,863,959 km (0.087 R)
• M85: 33,585,769 km (0.105 R)
• M86: 33,689,291 km (0.088 R)
• M87: 33,844,723 km (0.095 R)
• M88: 34,730,492 km (0.106 R)

Planet 10 - Ice Giant

Semi-Major Axis: 17.49 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 137.4

Radius: 7.1

Gravity: 2.73 G

Time & Orbit

Eccentricity (e): 0.124

Orbit Range: 15.32 AU - 19.66 AU

Year: 26453 Days

Day: 22.8 Hours

Environment

Temp: -196 °C

Axial Tilt: 5.7 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (66)

Outer Limit: 53,668,002 km

• M1: 119,678 km (0.058 R)
• M2: 251,324 km (0.071 R)
• M3: 516,861 km (0.101 R)
• M4: 1,323,492 km (0.081 R)
• M5: 1,416,093 km (0.066 R)
• M6: 2,150,619 km (0.039 R)
• M7: 2,399,550 km (0.03 R)
• M8: 2,513,244 km (0.115 R)
• M9: 2,955,306 km (0.117 R)
• M10: 4,214,172 km (0.074 R)
• M11: 4,455,773 km (0.1 R)
• M12: 5,025,142 km (0.065 R)
• M13: 5,171,000 km (0.114 R)
• M14: 5,281,403 km (0.085 R)
• M15: 5,768,643 km (0.088 R)
• M16: 6,466,817 km (0.049 R)
• M17: 6,826,001 km (0.076 R)
• M18: 9,202,214 km (0.12 R)
• M19: 9,246,794 km (0.119 R)
• M20: 9,515,771 km (0.102 R)
• M21: 10,570,286 km (0.084 R)
• M22: 11,421,199 km (0.115 R)
• M23: 11,517,091 km (0.06 R)
• M24: 12,441,606 km (0.056 R)
• M25: 13,238,364 km (0.104 R)
• M26: 13,288,779 km (0.087 R)
• M27: 14,000,416 km (0.086 R)
• M28: 14,568,140 km (0.102 R)
• M29: 14,672,260 km (0.074 R)
• M30: 15,407,384 km (0.071 R)
• M31: 16,695,571 km (0.088 R)
• M32: 17,077,794 km (0.068 R)
• M33: 17,187,449 km (0.069 R)
• M34: 18,129,616 km (0.1 R)
• M35: 19,259,379 km (0.117 R)
• M36: 19,487,965 km (0.061 R)
• M37: 21,705,005 km (0.069 R)
• M38: 22,481,568 km (0.107 R)
• M39: 22,964,021 km (0.089 R)
• M40: 23,145,783 km (0.098 R)
• M41: 23,388,879 km (0.104 R)
• M42: 23,816,430 km (0.086 R)
• M43: 24,123,405 km (0.095 R)
• M44: 24,185,039 km (0.104 R)
• M45: 26,372,010 km (0.057 R)
• M46: 29,209,732 km (0.06 R)
• M47: 29,801,990 km (0.089 R)
• M48: 31,804,657 km (0.036 R)
• M49: 32,549,954 km (0.098 R)
• M50: 36,290,648 km (0.103 R)
• M51: 37,496,108 km (0.07 R)
• M52: 37,567,466 km (0.034 R)
• M53: 38,283,142 km (0.076 R)
• M54: 38,570,669 km (0.08 R)
• M55: 40,676,708 km (0.116 R)
• M56: 40,823,314 km (0.051 R)
• M57: 41,117,124 km (0.079 R)
• M58: 41,264,179 km (0.096 R)
• M59: 43,267,743 km (0.053 R)
• M60: 43,492,290 km (0.088 R)
• M61: 43,792,383 km (0.06 R)
• M62: 45,302,723 km (0.114 R)
• M63: 48,141,792 km (0.077 R)
• M64: 49,074,833 km (0.116 R)
• M65: 52,786,357 km (0.1 R)
• M66: 53,427,084 km (0.096 R)

Kuiper Belt

Range: 30.3 - 60.3 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 489 - 17,446 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit