🌌 Stone's Star System Generator

Asteroid Belt

Center: 0.27 AU

Composition

Type: Inner (Rocky/Metallic)

A dense region of planetesimals and debris.

Boundary

Planet 1 - Gas Giant

Semi-Major Axis: 0.53 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 605.5

Radius: 14.7

Gravity: 2.8 G

Time & Orbit

Eccentricity (e): 0.245

Orbit Range: 0.4 AU - 0.66 AU

Year: 271 Days

Day: 9.8 Hours

Environment

Temp: -134 °C

Axial Tilt: 20.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (30)

Outer Limit: 47,992,191 km

• M1: 186,249 km (0.094 R)
• M2: 295,456 km (0.077 R)
• M3: 434,432 km (0.117 R)
• M4: 532,568 km (0.116 R)
• M5: 646,712 km (0.071 R)
• M6: 739,761 km (0.107 R)
• M7: 841,638 km (0.056 R)
• M8: 945,608 km (0.095 R)
• M9: 1,051,075 km (0.098 R)
• M10: 1,236,426 km (0.117 R)
• M11: 1,357,301 km (0.061 R)
• M12: 1,490,593 km (0.119 R)
• M13: 1,615,956 km (0.094 R)
• M14: 1,714,541 km (0.068 R)
• M15: 1,859,801 km (0.11 R)
• M16: 1,968,110 km (0.06 R)
• M17: 2,186,822 km (0.057 R)
• M18: 2,296,926 km (0.107 R)
• M19: 2,403,888 km (0.112 R)
• M20: 2,587,894 km (0.114 R)
• M21: 2,818,274 km (0.089 R)
• M22: 3,028,758 km (0.077 R)
• M23: 3,173,868 km (0.085 R)
• M24: 3,393,179 km (0.07 R)
• M25: 3,499,094 km (0.089 R)
• M26: 3,594,986 km (0.08 R)
• M27: 3,697,311 km (0.092 R)
• M28: 3,835,390 km (0.106 R)
• M29: 3,946,093 km (0.065 R)
• M30: 4,128,901 km (0.077 R)

Planet 2 - Gas Giant

Semi-Major Axis: 0.62 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 225.4

Radius: 8.8

Gravity: 2.91 G

Time & Orbit

Eccentricity (e): 0.025

Orbit Range: 0.6 AU - 0.64 AU

Year: 343 Days

Day: 12.2 Hours

Environment

Temp: -157 °C

Axial Tilt: 7.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (41)

Outer Limit: 47,992,191 km

• M1: 109,954 km (0.05 R)
• M2: 197,768 km (0.088 R)
• M3: 283,039 km (0.119 R)
• M4: 340,485 km (0.102 R)
• M5: 400,922 km (0.067 R)
• M6: 485,295 km (0.088 R)
• M7: 542,741 km (0.058 R)
• M8: 621,729 km (0.067 R)
• M9: 682,465 km (0.075 R)
• M10: 739,462 km (0.089 R)
• M11: 861,983 km (0.06 R)
• M12: 924,365 km (0.116 R)
• M13: 1,040,752 km (0.11 R)
• M14: 1,114,355 km (0.112 R)
• M15: 1,172,399 km (0.092 R)
• M16: 1,263,354 km (0.063 R)
• M17: 1,327,831 km (0.098 R)
• M18: 1,408,165 km (0.102 R)
• M19: 1,497,774 km (0.074 R)
• M20: 1,562,400 km (0.105 R)
• M21: 1,624,034 km (0.11 R)
• M22: 1,682,677 km (0.116 R)
• M23: 1,749,996 km (0.092 R)
• M24: 1,965,866 km (0.092 R)
• M25: 2,041,113 km (0.113 R)
• M26: 2,100,504 km (0.084 R)
• M27: 2,164,532 km (0.081 R)
• M28: 2,290,493 km (0.038 R)
• M29: 2,392,220 km (0.091 R)
• M30: 2,477,341 km (0.107 R)
• M31: 2,572,635 km (0.063 R)
• M32: 2,650,575 km (0.088 R)
• M33: 2,757,538 km (0.105 R)
• M34: 2,827,998 km (0.082 R)
• M35: 2,903,844 km (0.076 R)
• M36: 2,965,927 km (0.095 R)
• M37: 3,023,822 km (0.1 R)
• M38: 3,120,911 km (0.099 R)
• M39: 3,204,386 km (0.101 R)
• M40: 3,368,346 km (0.063 R)
• M41: 3,448,979 km (0.115 R)

Asteroid Belt

Center: 0.96 AU

Composition

Type: Outer System (Icy)

A dense region of planetesimals and debris.

Boundary

Planet 3 - Gas Giant

Semi-Major Axis: 1.3 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 112.9

Radius: 10.8

Gravity: 0.97 G

Time & Orbit

Eccentricity (e): 0.079

Orbit Range: 1.2 AU - 1.4 AU

Year: 1042 Days

Day: 6.1 Hours

Environment

Temp: -181 °C

Axial Tilt: 10.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (43)

Outer Limit: 47,992,191 km

• M1: 137,630 km (0.026 R)
• M2: 239,656 km (0.119 R)
• M3: 347,366 km (0.109 R)
• M4: 438,471 km (0.119 R)
• M5: 605,123 km (0.104 R)
• M6: 744,997 km (0.079 R)
• M7: 857,794 km (0.103 R)
• M8: 967,599 km (0.061 R)
• M9: 1,120,189 km (0.045 R)
• M10: 1,192,445 km (0.054 R)
• M11: 1,336,657 km (0.086 R)
• M12: 1,429,258 km (0.099 R)
• M13: 1,534,874 km (0.104 R)
• M14: 1,692,700 km (0.111 R)
• M15: 1,838,857 km (0.081 R)
• M16: 1,954,347 km (0.099 R)
• M17: 2,024,807 km (0.061 R)
• M18: 2,126,085 km (0.058 R)
• M19: 2,247,558 km (0.092 R)
• M20: 2,472,105 km (0.092 R)
• M21: 2,561,415 km (0.074 R)
• M22: 2,651,772 km (0.061 R)
• M23: 2,730,161 km (0.099 R)
• M24: 2,809,448 km (0.087 R)
• M25: 2,896,065 km (0.094 R)
• M26: 2,970,116 km (0.049 R)
• M27: 3,106,549 km (0.077 R)
• M28: 3,435,066 km (0.107 R)
• M29: 3,592,892 km (0.081 R)
• M30: 3,753,111 km (0.113 R)
• M31: 3,908,095 km (0.114 R)
• M32: 4,042,882 km (0.096 R)
• M33: 4,179,166 km (0.088 R)
• M34: 4,378,580 km (0.118 R)
• M35: 4,479,559 km (0.028 R)
• M36: 4,835,153 km (0.09 R)
• M37: 5,012,277 km (0.113 R)
• M38: 5,126,121 km (0.065 R)
• M39: 5,282,151 km (0.095 R)
• M40: 5,456,283 km (0.095 R)
• M41: 5,590,323 km (0.1 R)
• M42: 5,657,791 km (0.088 R)
• M43: 5,742,464 km (0.076 R)

Planet 4 - Gas Giant

Semi-Major Axis: 1.32 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 596.6

Radius: 8.3

Gravity: 8.66 G

Time & Orbit

Eccentricity (e): 0.246

Orbit Range: 1 AU - 1.64 AU

Year: 1066 Days

Day: 7.9 Hours

Environment

Temp: -179 °C

Axial Tilt: 17.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (65)

Outer Limit: 47,992,191 km

• M1: 116,686 km (0.067 R)
• M2: 190,887 km (0.058 R)
• M3: 268,229 km (0.112 R)
• M4: 415,732 km (0.03 R)
• M5: 537,356 km (0.096 R)
• M6: 625,469 km (0.079 R)
• M7: 718,967 km (0.088 R)
• M8: 836,402 km (0.11 R)
• M9: 907,311 km (0.042 R)
• M10: 980,464 km (0.094 R)
• M11: 1,140,235 km (0.099 R)
• M12: 1,338,751 km (0.114 R)
• M13: 1,415,196 km (0.104 R)
• M14: 1,540,559 km (0.119 R)
• M15: 1,620,893 km (0.043 R)
• M16: 1,702,573 km (0.089 R)
• M17: 1,794,127 km (0.116 R)
• M18: 2,078,662 km (0.105 R)
• M19: 2,167,823 km (0.08 R)
• M20: 2,368,433 km (0.043 R)
• M21: 2,480,333 km (0.096 R)
• M22: 2,671,070 km (0.101 R)
• M23: 2,846,698 km (0.109 R)
• M24: 2,916,111 km (0.098 R)
• M25: 3,188,978 km (0.082 R)
• M26: 3,292,200 km (0.104 R)
• M27: 3,396,470 km (0.097 R)
• M28: 3,512,558 km (0.107 R)
• M29: 3,597,829 km (0.117 R)
• M30: 3,901,512 km (0.104 R)
• M31: 4,000,995 km (0.12 R)
• M32: 4,134,885 km (0.091 R)
• M33: 4,191,134 km (0.085 R)
• M34: 4,281,641 km (0.114 R)
• M35: 4,372,746 km (0.082 R)
• M36: 4,441,561 km (0.078 R)
• M37: 4,545,382 km (0.083 R)
• M38: 4,791,021 km (0.04 R)
• M39: 4,969,043 km (0.028 R)
• M40: 5,356,352 km (0.103 R)
• M41: 5,541,255 km (0.119 R)
• M42: 5,678,137 km (0.113 R)
• M43: 5,955,342 km (0.09 R)
• M44: 6,070,083 km (0.051 R)
• M45: 6,146,977 km (0.1 R)
• M46: 6,510,051 km (0.083 R)
• M47: 6,562,559 km (0.12 R)
• M48: 7,121,607 km (0.114 R)
• M49: 7,489,169 km (0.116 R)
• M50: 7,807,214 km (0.086 R)
• M51: 7,890,839 km (0.098 R)
• M52: 8,045,074 km (0.112 R)
• M53: 8,172,083 km (0.11 R)
• M54: 8,313,902 km (0.119 R)
• M55: 8,571,210 km (0.084 R)
• M56: 8,729,634 km (0.055 R)
• M57: 8,802,040 km (0.094 R)
• M58: 8,860,083 km (0.095 R)
• M59: 8,932,938 km (0.073 R)
• M60: 9,020,452 km (0.115 R)
• M61: 9,225,850 km (0.07 R)
• M62: 9,314,412 km (0.092 R)
• M63: 9,821,399 km (0.108 R)
• M64: 9,926,866 km (0.085 R)
• M65: 10,002,413 km (0.092 R)

Planet 5 - Gas Giant

Semi-Major Axis: 1.34 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 66.6

Radius: 12.5

Gravity: 0.43 G

Time & Orbit

Eccentricity (e): 0.047

Orbit Range: 1.28 AU - 1.4 AU

Year: 1090 Days

Day: 9.7 Hours

Environment

Temp: -181 °C

Axial Tilt: 6.8 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (31)

Outer Limit: 47,992,191 km

• M1: 158,873 km (0.09 R)
• M2: 269,875 km (0.117 R)
• M3: 355,594 km (0.055 R)
• M4: 461,659 km (0.074 R)
• M5: 540,198 km (0.092 R)
• M6: 658,530 km (0.119 R)
• M7: 828,024 km (0.085 R)
• M8: 956,529 km (0.094 R)
• M9: 1,402,630 km (0.086 R)
• M10: 1,487,152 km (0.11 R)
• M11: 1,817,315 km (0.087 R)
• M12: 2,009,847 km (0.101 R)
• M13: 2,122,195 km (0.085 R)
• M14: 2,231,252 km (0.069 R)
• M15: 2,404,187 km (0.045 R)
• M16: 2,581,610 km (0.113 R)
• M17: 2,663,141 km (0.048 R)
• M18: 2,811,094 km (0.095 R)
• M19: 2,973,856 km (0.086 R)
• M20: 3,108,943 km (0.058 R)
• M21: 3,309,254 km (0.087 R)
• M22: 3,487,874 km (0.086 R)
• M23: 3,591,546 km (0.117 R)
• M24: 3,768,670 km (0.079 R)
• M25: 3,875,034 km (0.11 R)
• M26: 4,070,558 km (0.076 R)
• M27: 4,241,698 km (0.111 R)
• M28: 4,548,822 km (0.025 R)
• M29: 4,655,187 km (0.108 R)
• M30: 4,783,990 km (0.115 R)
• M31: 4,906,661 km (0.059 R)

Planet 6 - Gas Giant

Semi-Major Axis: 1.39 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 113.1

Radius: 8.9

Gravity: 1.43 G

Time & Orbit

Eccentricity (e): 0.031

Orbit Range: 1.35 AU - 1.43 AU

Year: 1152 Days

Day: 13 Hours

Environment

Temp: -182 °C

Axial Tilt: 49.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (48)

Outer Limit: 47,992,191 km

• M1: 118,781 km (0.06 R)
• M2: 207,343 km (0.087 R)
• M3: 301,141 km (0.12 R)
• M4: 380,876 km (0.033 R)
• M5: 437,873 km (0.108 R)
• M6: 554,559 km (0.076 R)
• M7: 613,052 km (0.118 R)
• M8: 703,409 km (0.112 R)
• M9: 785,239 km (0.07 R)
• M10: 893,398 km (0.102 R)
• M11: 987,645 km (0.103 R)
• M12: 1,045,988 km (0.099 R)
• M13: 1,150,856 km (0.114 R)
• M14: 1,248,843 km (0.084 R)
• M15: 1,393,205 km (0.047 R)
• M16: 1,520,513 km (0.099 R)
• M17: 1,611,468 km (0.03 R)
• M18: 1,692,550 km (0.094 R)
• M19: 1,786,947 km (0.094 R)
• M20: 1,865,037 km (0.028 R)
• M21: 1,968,858 km (0.083 R)
• M22: 2,043,357 km (0.102 R)
• M23: 2,137,903 km (0.101 R)
• M24: 2,233,795 km (0.116 R)
• M25: 2,436,800 km (0.099 R)
• M26: 2,496,788 km (0.111 R)
• M27: 2,625,293 km (0.082 R)
• M28: 2,714,453 km (0.094 R)
• M29: 3,002,429 km (0.102 R)
• M30: 3,226,826 km (0.042 R)
• M31: 3,300,428 km (0.086 R)
• M32: 3,381,959 km (0.036 R)
• M33: 3,623,111 km (0.095 R)
• M34: 3,738,002 km (0.089 R)
• M35: 3,948,187 km (0.053 R)
• M36: 4,050,662 km (0.116 R)
• M37: 4,138,176 km (0.112 R)
• M38: 4,453,379 km (0.09 R)
• M39: 4,885,717 km (0.088 R)
• M40: 4,953,485 km (0.077 R)
• M41: 5,132,853 km (0.091 R)
• M42: 5,201,668 km (0.103 R)
• M43: 5,418,884 km (0.116 R)
• M44: 5,489,045 km (0.108 R)
• M45: 5,577,158 km (0.11 R)
• M46: 5,674,696 km (0.083 R)
• M47: 5,889,369 km (0.11 R)
• M48: 6,015,779 km (0.078 R)

Planet 7 - Gas Giant

Semi-Major Axis: 3.13 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 117.5

Radius: 14.1

Gravity: 0.59 G

Time & Orbit

Eccentricity (e): 0.152

Orbit Range: 2.65 AU - 3.61 AU

Year: 3892 Days

Day: 14.2 Hours

Environment

Temp: -204 °C

Axial Tilt: 39.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (54)

Outer Limit: 47,992,191 km

• M1: 198,516 km (0.108 R)
• M2: 296,054 km (0.108 R)
• M3: 486,791 km (0.056 R)
• M4: 673,041 km (0.063 R)
• M5: 780,302 km (0.051 R)
• M6: 949,647 km (0.081 R)
• M7: 1,140,983 km (0.047 R)
• M8: 1,327,532 km (0.088 R)
• M9: 1,429,557 km (0.068 R)
• M10: 1,563,597 km (0.1 R)
• M11: 1,652,009 km (0.07 R)
• M12: 1,928,167 km (0.091 R)
• M13: 2,023,760 km (0.066 R)
• M14: 2,241,874 km (0.05 R)
• M15: 2,725,673 km (0.11 R)
• M16: 2,918,654 km (0.114 R)
• M17: 3,103,857 km (0.119 R)
• M18: 3,229,519 km (0.084 R)
• M19: 3,460,199 km (0.088 R)
• M20: 3,696,264 km (0.106 R)
• M21: 3,802,927 km (0.078 R)
• M22: 3,978,555 km (0.081 R)
• M23: 4,101,824 km (0.114 R)
• M24: 4,352,101 km (0.037 R)
• M25: 4,450,836 km (0.113 R)
• M26: 4,838,743 km (0.054 R)
• M27: 5,014,670 km (0.104 R)
• M28: 5,388,216 km (0.112 R)
• M29: 5,494,431 km (0.117 R)
• M30: 6,856,220 km (0.114 R)
• M31: 7,557,834 km (0.107 R)
• M32: 7,796,891 km (0.028 R)
• M33: 7,969,228 km (0.077 R)
• M34: 8,125,408 km (0.106 R)
• M35: 8,265,133 km (0.07 R)
• M36: 8,458,413 km (0.059 R)
• M37: 8,671,141 km (0.11 R)
• M38: 8,957,472 km (0.109 R)
• M39: 9,156,287 km (0.048 R)
• M40: 9,265,195 km (0.091 R)
• M41: 9,374,700 km (0.104 R)
• M42: 9,502,906 km (0.065 R)
• M43: 10,115,359 km (0.116 R)
• M44: 10,530,793 km (0.1 R)
• M45: 11,378,564 km (0.057 R)
• M46: 12,028,716 km (0.096 R)
• M47: 12,489,029 km (0.102 R)
• M48: 12,772,068 km (0.105 R)
• M49: 12,996,016 km (0.084 R)
• M50: 13,262,300 km (0.104 R)
• M51: 13,509,735 km (0.108 R)
• M52: 13,634,051 km (0.077 R)
• M53: 13,904,673 km (0.069 R)
• M54: 14,156,147 km (0.112 R)

Planet 8 - Ice Giant

Semi-Major Axis: 5.93 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 667.3

Radius: 5

Gravity: 26.69 G

Time & Orbit

Eccentricity (e): 0.006

Orbit Range: 5.89 AU - 5.97 AU

Year: 10151 Days

Day: 23.1 Hours

Environment

Temp: -222 °C

Axial Tilt: 37.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (97)

Outer Limit: 47,992,191 km

• M1: 70,012 km (0.085 R)
• M2: 197,768 km (0.063 R)
• M3: 263,143 km (0.093 R)
• M4: 1,026,989 km (0.092 R)
• M5: 1,146,668 km (0.109 R)
• M6: 1,270,984 km (0.085 R)
• M7: 1,443,470 km (0.114 R)
• M8: 1,487,900 km (0.064 R)
• M9: 1,646,624 km (0.119 R)
• M10: 1,692,999 km (0.111 R)
• M11: 2,519,228 km (0.057 R)
• M12: 2,846,698 km (0.102 R)
• M13: 3,129,737 km (0.057 R)
• M14: 3,481,142 km (0.086 R)
• M15: 3,938,014 km (0.061 R)
• M16: 4,000,397 km (0.112 R)
• M17: 4,094,494 km (0.03 R)
• M18: 4,126,059 km (0.084 R)
• M19: 4,446,049 km (0.103 R)
• M20: 5,177,582 km (0.029 R)
• M21: 5,839,104 km (0.055 R)
• M22: 6,749,258 km (0.107 R)
• M23: 6,786,507 km (0.115 R)
• M24: 7,239,789 km (0.096 R)
• M25: 7,586,108 km (0.111 R)
• M26: 8,135,581 km (0.117 R)
• M27: 8,215,167 km (0.103 R)
• M28: 8,415,179 km (0.066 R)
• M29: 9,859,397 km (0.082 R)
• M30: 10,200,181 km (0.098 R)
• M31: 10,371,920 km (0.103 R)
• M32: 11,512,005 km (0.069 R)
• M33: 12,006,127 km (0.107 R)
• M34: 12,187,589 km (0.11 R)
• M35: 12,599,133 km (0.053 R)
• M36: 12,783,587 km (0.113 R)
• M37: 13,061,689 km (0.111 R)
• M38: 13,482,807 km (0.075 R)
• M39: 13,529,931 km (0.112 R)
• M40: 13,577,054 km (0.089 R)
• M41: 14,098,851 km (0.106 R)
• M42: 14,579,060 km (0.106 R)
• M43: 14,724,170 km (0.06 R)
• M44: 14,772,640 km (0.078 R)
• M45: 15,211,261 km (0.116 R)
• M46: 15,260,180 km (0.112 R)
• M47: 15,654,071 km (0.082 R)
• M48: 16,301,231 km (0.079 R)
• M49: 16,351,496 km (0.095 R)
• M50: 17,570,270 km (0.032 R)
• M51: 18,086,682 km (0.042 R)
• M52: 18,765,557 km (0.107 R)
• M53: 19,559,174 km (0.038 R)
• M54: 20,040,430 km (0.051 R)
• M55: 20,309,557 km (0.042 R)
• M56: 20,742,642 km (0.095 R)
• M57: 21,507,985 km (0.101 R)
• M58: 22,673,053 km (0.097 R)
• M59: 22,729,003 km (0.034 R)
• M60: 25,586,621 km (0.068 R)
• M61: 26,112,907 km (0.112 R)
• M62: 26,406,717 km (0.107 R)
• M63: 26,760,965 km (0.086 R)
• M64: 27,057,168 km (0.062 R)
• M65: 28,494,654 km (0.08 R)
• M66: 28,676,117 km (0.097 R)
• M67: 28,797,291 km (0.1 R)
• M68: 29,711,334 km (0.056 R)
• M69: 29,956,674 km (0.062 R)
• M70: 31,255,932 km (0.069 R)
• M71: 31,630,525 km (0.085 R)
• M72: 32,195,107 km (0.095 R)
• M73: 33,717,116 km (0.036 R)
• M74: 34,358,143 km (0.11 R)
• M75: 36,108,887 km (0.071 R)
• M76: 36,174,261 km (0.111 R)
• M77: 36,436,357 km (0.12 R)
• M78: 36,501,880 km (0.103 R)
• M79: 36,698,901 km (0.083 R)
• M80: 36,896,370 km (0.078 R)
• M81: 37,160,111 km (0.069 R)
• M82: 37,556,845 km (0.112 R)
• M83: 39,426,818 km (0.078 R)
• M84: 40,441,092 km (0.06 R)
• M85: 40,713,061 km (0.108 R)
• M86: 41,258,644 km (0.078 R)
• M87: 41,327,010 km (0.097 R)
• M88: 43,117,996 km (0.069 R)
• M89: 43,604,488 km (0.11 R)
• M90: 43,674,201 km (0.096 R)
• M91: 45,145,346 km (0.052 R)
• M92: 45,497,948 km (0.12 R)
• M93: 46,490,381 km (0.068 R)
• M94: 46,632,648 km (0.096 R)
• M95: 46,775,215 km (0.041 R)
• M96: 47,704,966 km (0.111 R)
• M97: 47,992,194 km (0.098 R)

Kuiper Belt

Range: 30 - 50 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 509 - 16,663 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit