🌌 Stone's Star System Generator

Asteroid Belt

Center: 0.64 AU

Composition

Type: Main (Rocky/Icy Mix)

A dense region of planetesimals and debris.

Boundary

Planet 1 - Gas Giant

Semi-Major Axis: 1.28 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 757.9

Radius: 8.1

Gravity: 11.55 G

Time & Orbit

Eccentricity (e): 0.166

Orbit Range: 1.07 AU - 1.49 AU

Year: 921 Days

Day: 10.6 Hours

Environment

Temp: -166 °C

Axial Tilt: 39.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (63)

Outer Limit: 37,725,655 km

• M1: 104,270 km (0.107 R)
• M2: 163,510 km (0.097 R)
• M3: 222,901 km (0.101 R)
• M4: 310,416 km (0.119 R)
• M5: 475,871 km (0.09 R)
• M6: 527,183 km (0.05 R)
• M7: 586,124 km (0.102 R)
• M8: 676,332 km (0.114 R)
• M9: 852,259 km (0.111 R)
• M10: 1,002,605 km (0.085 R)
• M11: 1,381,836 km (0.11 R)
• M12: 1,458,280 km (0.117 R)
• M13: 1,712,447 km (0.066 R)
• M14: 1,811,481 km (0.079 R)
• M15: 1,998,029 km (0.092 R)
• M16: 2,102,448 km (0.077 R)
• M17: 2,253,542 km (0.109 R)
• M18: 2,325,798 km (0.105 R)
• M19: 2,398,951 km (0.057 R)
• M20: 2,473,002 km (0.066 R)
• M21: 2,623,199 km (0.103 R)
• M22: 2,708,918 km (0.097 R)
• M23: 2,893,223 km (0.106 R)
• M24: 3,041,774 km (0.039 R)
• M25: 3,284,421 km (0.085 R)
• M26: 3,418,611 km (0.084 R)
• M27: 3,523,030 km (0.077 R)
• M28: 3,649,739 km (0.074 R)
• M29: 3,778,094 km (0.119 R)
• M30: 3,962,399 km (0.089 R)
• M31: 4,238,856 km (0.046 R)
• M32: 4,544,335 km (0.101 R)
• M33: 4,601,780 km (0.064 R)
• M34: 4,717,270 km (0.089 R)
• M35: 4,880,631 km (0.052 R)
• M36: 4,951,241 km (0.07 R)
• M37: 5,057,754 km (0.1 R)
• M38: 5,129,113 km (0.076 R)
• M39: 5,200,920 km (0.082 R)
• M40: 5,589,425 km (0.107 R)
• M41: 5,700,427 km (0.106 R)
• M42: 6,189,761 km (0.116 R)
• M43: 6,317,368 km (0.058 R)
• M44: 6,536,380 km (0.057 R)
• M45: 6,995,196 km (0.114 R)
• M46: 7,048,304 km (0.071 R)
• M47: 7,235,151 km (0.063 R)
• M48: 7,396,717 km (0.058 R)
• M49: 7,545,866 km (0.099 R)
• M50: 7,764,578 km (0.091 R)
• M51: 7,860,919 km (0.093 R)
• M52: 7,943,797 km (0.105 R)
• M53: 8,013,060 km (0.056 R)
• M54: 8,152,336 km (0.112 R)
• M55: 8,702,856 km (0.055 R)
• M56: 8,817,298 km (0.046 R)
• M57: 9,033,318 km (0.044 R)
• M58: 9,207,300 km (0.096 R)
• M59: 9,397,140 km (0.081 R)
• M60: 9,470,443 km (0.089 R)
• M61: 9,617,647 km (0.063 R)
• M62: 9,676,738 km (0.106 R)
• M63: 10,004,058 km (0.092 R)

Planet 2 - Gas Giant

Semi-Major Axis: 1.47 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 902.1

Radius: 12.1

Gravity: 6.16 G

Time & Orbit

Eccentricity (e): 0.154

Orbit Range: 1.24 AU - 1.7 AU

Year: 1133 Days

Day: 12.6 Hours

Environment

Temp: -183 °C

Axial Tilt: 9.4 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (56)

Outer Limit: 37,725,655 km

• M1: 150,795 km (0.056 R)
• M2: 244,144 km (0.116 R)
• M3: 390,151 km (0.12 R)
• M4: 558,150 km (0.065 R)
• M5: 707,000 km (0.108 R)
• M6: 828,473 km (0.093 R)
• M7: 935,585 km (0.035 R)
• M8: 1,078,601 km (0.108 R)
• M9: 1,262,008 km (0.048 R)
• M10: 1,345,184 km (0.079 R)
• M11: 1,597,256 km (0.093 R)
• M12: 1,706,164 km (0.109 R)
• M13: 1,884,036 km (0.117 R)
• M14: 2,028,846 km (0.111 R)
• M15: 2,157,351 km (0.072 R)
• M16: 2,248,157 km (0.071 R)
• M17: 2,464,775 km (0.05 R)
• M18: 2,623,947 km (0.06 R)
• M19: 2,863,453 km (0.093 R)
• M20: 2,986,123 km (0.046 R)
• M21: 3,213,512 km (0.113 R)
• M22: 3,387,793 km (0.076 R)
• M23: 3,493,858 km (0.092 R)
• M24: 3,697,461 km (0.1 R)
• M25: 3,782,433 km (0.051 R)
• M26: 4,091,352 km (0.087 R)
• M27: 4,204,598 km (0.12 R)
• M28: 4,395,784 km (0.105 R)
• M29: 4,498,857 km (0.04 R)
• M30: 4,615,842 km (0.086 R)
• M31: 4,773,518 km (0.107 R)
• M32: 4,892,898 km (0.076 R)
• M33: 5,121,034 km (0.084 R)
• M34: 5,504,753 km (0.095 R)
• M35: 5,770,439 km (0.084 R)
• M36: 6,040,463 km (0.088 R)
• M37: 6,155,354 km (0.1 R)
• M38: 6,815,380 km (0.07 R)
• M39: 6,905,139 km (0.091 R)
• M40: 7,070,743 km (0.084 R)
• M41: 7,252,804 km (0.096 R)
• M42: 7,375,025 km (0.086 R)
• M43: 8,266,180 km (0.117 R)
• M44: 8,458,114 km (0.116 R)
• M45: 8,570,761 km (0.03 R)
• M46: 8,667,701 km (0.049 R)
• M47: 8,846,470 km (0.028 R)
• M48: 9,125,171 km (0.061 R)
• M49: 9,389,959 km (0.047 R)
• M50: 9,590,420 km (0.107 R)
• M51: 10,012,436 km (0.106 R)
• M52: 10,839,712 km (0.07 R)
• M53: 10,927,227 km (0.073 R)
• M54: 12,049,211 km (0.073 R)
• M55: 12,139,718 km (0.107 R)
• M56: 12,248,774 km (0.082 R)

Planet 3 - Gas Giant

Semi-Major Axis: 1.74 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 216.8

Radius: 9.5

Gravity: 2.4 G

Time & Orbit

Eccentricity (e): 0.222

Orbit Range: 1.35 AU - 2.13 AU

Year: 1459 Days

Day: 14 Hours

Environment

Temp: -184 °C

Axial Tilt: 39.8 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (55)

Outer Limit: 37,725,655 km

• M1: 141,520 km (0.069 R)
• M2: 227,239 km (0.061 R)
• M3: 312,809 km (0.111 R)
• M4: 400,773 km (0.076 R)
• M5: 494,271 km (0.055 R)
• M6: 596,297 km (0.093 R)
• M7: 722,558 km (0.077 R)
• M8: 800,648 km (0.108 R)
• M9: 965,804 km (0.036 R)
• M10: 1,295,966 km (0.09 R)
• M11: 1,385,875 km (0.105 R)
• M12: 1,470,697 km (0.071 R)
• M13: 1,579,155 km (0.081 R)
• M14: 1,720,675 km (0.114 R)
• M15: 1,992,344 km (0.116 R)
• M16: 2,064,451 km (0.12 R)
• M17: 2,395,810 km (0.098 R)
• M18: 2,673,164 km (0.046 R)
• M19: 2,860,760 km (0.118 R)
• M20: 2,969,967 km (0.103 R)
• M21: 3,315,538 km (0.072 R)
• M22: 3,440,153 km (0.116 R)
• M23: 3,507,771 km (0.12 R)
• M24: 3,832,997 km (0.082 R)
• M25: 3,903,158 km (0.105 R)
• M26: 4,014,459 km (0.116 R)
• M27: 4,219,558 km (0.041 R)
• M28: 4,417,625 km (0.068 R)
• M29: 4,909,653 km (0.106 R)
• M30: 5,162,323 km (0.097 R)
• M31: 5,239,965 km (0.07 R)
• M32: 5,396,743 km (0.088 R)
• M33: 5,520,909 km (0.089 R)
• M34: 5,726,158 km (0.085 R)
• M35: 5,795,272 km (0.062 R)
• M36: 6,179,738 km (0.1 R)
• M37: 6,357,162 km (0.077 R)
• M38: 6,428,669 km (0.053 R)
• M39: 6,548,497 km (0.077 R)
• M40: 6,717,393 km (0.083 R)
• M41: 6,838,867 km (0.066 R)
• M42: 6,899,903 km (0.065 R)
• M43: 7,010,306 km (0.075 R)
• M44: 7,071,791 km (0.047 R)
• M45: 7,432,321 km (0.073 R)
• M46: 7,697,259 km (0.08 R)
• M47: 7,760,838 km (0.078 R)
• M48: 7,837,283 km (0.112 R)
• M49: 7,990,920 km (0.033 R)
• M50: 8,327,365 km (0.093 R)
• M51: 8,405,755 km (0.116 R)
• M52: 8,497,458 km (0.085 R)
• M53: 8,655,284 km (0.096 R)
• M54: 8,880,728 km (0.111 R)
• M55: 9,000,855 km (0.09 R)

Planet 4 - Gas Giant

Semi-Major Axis: 2.62 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 488.4

Radius: 9.9

Gravity: 4.98 G

Time & Orbit

Eccentricity (e): 0.044

Orbit Range: 2.5 AU - 2.74 AU

Year: 2696 Days

Day: 11.4 Hours

Environment

Temp: -201 °C

Axial Tilt: 34.8 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (75)

Outer Limit: 37,725,655 km

• M1: 123,717 km (0.069 R)
• M2: 193,280 km (0.077 R)
• M3: 259,852 km (0.053 R)
• M4: 333,603 km (0.105 R)
• M5: 424,110 km (0.107 R)
• M6: 509,830 km (0.08 R)
• M7: 667,655 km (0.085 R)
• M8: 879,486 km (0.101 R)
• M9: 964,757 km (0.043 R)
• M10: 1,280,408 km (0.072 R)
• M11: 1,378,245 km (0.085 R)
• M12: 1,478,625 km (0.115 R)
• M13: 1,628,074 km (0.071 R)
• M14: 1,710,652 km (0.084 R)
• M15: 1,979,629 km (0.115 R)
• M16: 2,355,119 km (0.119 R)
• M17: 2,530,747 km (0.067 R)
• M18: 2,627,088 km (0.096 R)
• M19: 2,696,801 km (0.1 R)
• M20: 2,809,448 km (0.07 R)
• M21: 3,472,615 km (0.11 R)
• M22: 3,580,027 km (0.039 R)
• M23: 3,704,193 km (0.06 R)
• M24: 4,117,831 km (0.102 R)
• M25: 4,346,716 km (0.107 R)
• M26: 4,697,822 km (0.03 R)
• M27: 4,937,029 km (0.08 R)
• M28: 5,058,203 km (0.09 R)
• M29: 5,197,928 km (0.087 R)
• M30: 6,081,153 km (0.046 R)
• M31: 6,229,854 km (0.117 R)
• M32: 6,473,997 km (0.115 R)
• M33: 6,644,838 km (0.117 R)
• M34: 7,362,908 km (0.079 R)
• M35: 8,146,502 km (0.026 R)
• M36: 8,517,056 km (0.115 R)
• M37: 8,600,232 km (0.053 R)
• M38: 8,662,614 km (0.083 R)
• M39: 8,830,164 km (0.106 R)
• M40: 9,381,731 km (0.039 R)
• M41: 9,618,545 km (0.092 R)
• M42: 9,705,012 km (0.069 R)
• M43: 10,207,960 km (0.117 R)
• M44: 10,274,232 km (0.112 R)
• M45: 10,429,216 km (0.07 R)
• M46: 10,652,266 km (0.08 R)
• M47: 10,809,194 km (0.116 R)
• M48: 10,989,460 km (0.037 R)
• M49: 11,057,377 km (0.045 R)
• M50: 11,261,877 km (0.117 R)
• M51: 11,421,947 km (0.067 R)
• M52: 11,605,653 km (0.099 R)
• M53: 11,859,820 km (0.107 R)
• M54: 11,999,245 km (0.045 R)
• M55: 12,186,093 km (0.119 R)
• M56: 12,823,529 km (0.052 R)
• M57: 13,230,585 km (0.074 R)
• M58: 13,351,012 km (0.11 R)
• M59: 13,568,826 km (0.098 R)
• M60: 13,812,222 km (0.118 R)
• M61: 13,885,674 km (0.102 R)
• M62: 14,352,869 km (0.109 R)
• M63: 14,526,402 km (0.086 R)
• M64: 15,000,777 km (0.074 R)
• M65: 15,176,854 km (0.103 R)
• M66: 15,353,678 km (0.08 R)
• M67: 15,429,674 km (0.102 R)
• M68: 15,607,396 km (0.096 R)
• M69: 16,093,141 km (0.096 R)
• M70: 16,402,659 km (0.092 R)
• M71: 16,583,971 km (0.042 R)
• M72: 17,079,738 km (0.06 R)
• M73: 17,263,744 km (0.077 R)
• M74: 17,712,986 km (0.106 R)
• M75: 17,845,829 km (0.097 R)

Planet 5 - Ice Giant

Semi-Major Axis: 6.42 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 291.1

Radius: 3.5

Gravity: 23.76 G

Time & Orbit

Eccentricity (e): 0.231

Orbit Range: 4.94 AU - 7.9 AU

Year: 10343 Days

Day: 20.9 Hours

Environment

Temp: -227 °C

Axial Tilt: 33.1 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (95)

Outer Limit: 37,725,655 km

• M1: 327,021 km (0.087 R)
• M2: 360,381 km (0.062 R)
• M3: 571,015 km (0.088 R)
• M4: 639,531 km (0.109 R)
• M5: 814,860 km (0.111 R)
• M6: 923,767 km (0.093 R)
• M7: 1,004,550 km (0.074 R)
• M8: 1,313,918 km (0.075 R)
• M9: 1,749,098 km (0.06 R)
• M10: 1,788,891 km (0.078 R)
• M11: 2,139,549 km (0.119 R)
• M12: 2,311,736 km (0.094 R)
• M13: 2,443,831 km (0.069 R)
• M14: 2,488,411 km (0.103 R)
• M15: 2,901,750 km (0.072 R)
• M16: 3,116,423 km (0.103 R)
• M17: 3,560,878 km (0.058 R)
• M18: 4,263,988 km (0.072 R)
• M19: 4,700,365 km (0.118 R)
• M20: 5,323,291 km (0.085 R)
• M21: 5,352,313 km (0.112 R)
• M22: 5,556,215 km (0.057 R)
• M23: 5,762,809 km (0.109 R)
• M24: 5,822,349 km (0.105 R)
• M25: 6,489,855 km (0.085 R)
• M26: 6,832,584 km (0.082 R)
• M27: 6,895,564 km (0.112 R)
• M28: 6,990,409 km (0.107 R)
• M29: 7,117,418 km (0.105 R)
• M30: 8,061,380 km (0.112 R)
• M31: 8,295,052 km (0.052 R)
• M32: 8,734,870 km (0.104 R)
• M33: 8,906,160 km (0.114 R)
• M34: 8,940,567 km (0.094 R)
• M35: 9,251,880 km (0.093 R)
• M36: 9,391,306 km (0.114 R)
• M37: 9,743,160 km (0.12 R)
• M38: 10,063,598 km (0.082 R)
• M39: 10,751,150 km (0.104 R)
• M40: 10,824,304 km (0.05 R)
• M41: 10,861,105 km (0.087 R)
• M42: 11,193,062 km (0.101 R)
• M43: 11,491,061 km (0.059 R)
• M44: 11,980,845 km (0.048 R)
• M45: 12,209,281 km (0.096 R)
• M46: 13,175,982 km (0.11 R)
• M47: 13,332,910 km (0.05 R)
• M48: 14,167,068 km (0.056 R)
• M49: 14,247,402 km (0.088 R)
• M50: 15,223,079 km (0.083 R)
• M51: 15,429,076 km (0.11 R)
• M52: 16,220,149 km (0.075 R)
• M53: 16,557,044 km (0.048 R)
• M54: 17,452,686 km (0.098 R)
• M55: 17,625,023 km (0.06 R)
• M56: 17,797,958 km (0.053 R)
• M57: 17,841,341 km (0.058 R)
• M58: 18,320,204 km (0.109 R)
• M59: 18,671,011 km (0.098 R)
• M60: 18,715,142 km (0.116 R)
• M61: 18,891,518 km (0.113 R)
• M62: 18,979,931 km (0.118 R)
• M63: 19,334,926 km (0.067 R)
• M64: 19,737,045 km (0.063 R)
• M65: 19,916,563 km (0.057 R)
• M66: 20,187,036 km (0.062 R)
• M67: 21,741,956 km (0.079 R)
• M68: 21,834,557 km (0.096 R)
• M69: 21,973,833 km (0.065 R)
• M70: 22,627,576 km (0.116 R)
• M71: 22,721,373 km (0.117 R)
• M72: 22,909,568 km (0.062 R)
• M73: 23,477,291 km (0.091 R)
• M74: 23,667,580 km (0.048 R)
• M75: 24,723,143 km (0.064 R)
• M76: 24,868,252 km (0.067 R)
• M77: 25,062,131 km (0.104 R)
• M78: 26,433,794 km (0.116 R)
• M79: 27,228,458 km (0.115 R)
• M80: 28,232,709 km (0.06 R)
• M81: 28,993,863 km (0.112 R)
• M82: 29,095,888 km (0.119 R)
• M83: 29,658,975 km (0.091 R)
• M84: 30,070,818 km (0.114 R)
• M85: 30,536,366 km (0.106 R)
• M86: 30,692,098 km (0.113 R)
• M87: 30,952,099 km (0.109 R)
• M88: 31,108,578 km (0.069 R)
• M89: 31,527,003 km (0.116 R)
• M90: 32,210,815 km (0.083 R)
• M91: 33,059,185 km (0.091 R)
• M92: 33,968,441 km (0.055 R)
• M93: 34,669,456 km (0.087 R)
• M94: 35,538,769 km (0.092 R)
• M95: 36,580,270 km (0.066 R)

Planet 6 - Ice Giant

Semi-Major Axis: 8.12 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 154.3

Radius: 6.6

Gravity: 3.54 G

Time & Orbit

Eccentricity (e): 0.139

Orbit Range: 6.99 AU - 9.25 AU

Year: 14712 Days

Day: 24.8 Hours

Environment

Temp: -230 °C

Axial Tilt: 80.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (90)

Outer Limit: 37,725,655 km

• M1: 91,554 km (0.099 R)
• M2: 144,362 km (0.084 R)
• M3: 350,059 km (0.101 R)
• M4: 902,075 km (0.049 R)
• M5: 1,115,402 km (0.108 R)
• M6: 1,201,720 km (0.119 R)
• M7: 1,344,586 km (0.081 R)
• M8: 1,436,738 km (0.068 R)
• M9: 2,203,726 km (0.093 R)
• M10: 2,861,508 km (0.055 R)
• M11: 3,053,143 km (0.096 R)
• M12: 3,525,124 km (0.095 R)
• M13: 3,678,761 km (0.091 R)
• M14: 3,966,438 km (0.077 R)
• M15: 4,535,658 km (0.096 R)
• M16: 4,731,182 km (0.114 R)
• M17: 5,159,331 km (0.12 R)
• M18: 5,510,737 km (0.095 R)
• M19: 5,629,517 km (0.101 R)
• M20: 5,779,415 km (0.067 R)
• M21: 6,329,486 km (0.076 R)
• M22: 6,579,314 km (0.083 R)
• M23: 6,705,575 km (0.089 R)
• M24: 7,056,681 km (0.075 R)
• M25: 7,250,710 km (0.085 R)
• M26: 7,743,485 km (0.116 R)
• M27: 8,145,454 km (0.115 R)
• M28: 9,356,300 km (0.112 R)
• M29: 9,820,352 km (0.035 R)
• M30: 9,928,511 km (0.026 R)
• M31: 10,291,735 km (0.112 R)
• M32: 10,474,993 km (0.106 R)
• M33: 10,919,298 km (0.075 R)
• M34: 11,673,571 km (0.117 R)
• M35: 12,172,779 km (0.114 R)
• M36: 14,524,607 km (0.114 R)
• M37: 14,812,732 km (0.098 R)
• M38: 14,936,749 km (0.089 R)
• M39: 16,281,634 km (0.078 R)
• M40: 16,666,848 km (0.11 R)
• M41: 16,795,951 km (0.108 R)
• M42: 17,141,672 km (0.052 R)
• M43: 17,359,038 km (0.097 R)
• M44: 18,237,327 km (0.062 R)
• M45: 19,310,392 km (0.103 R)
• M46: 19,491,256 km (0.108 R)
• M47: 20,174,320 km (0.093 R)
• M48: 20,403,803 km (0.101 R)
• M49: 21,097,339 km (0.112 R)
• M50: 21,330,263 km (0.114 R)
• M51: 22,365,181 km (0.054 R)
• M52: 23,032,088 km (0.118 R)
• M53: 23,560,767 km (0.117 R)
• M54: 23,754,047 km (0.11 R)
• M55: 23,947,777 km (0.09 R)
• M56: 24,142,104 km (0.028 R)
• M57: 24,239,493 km (0.045 R)
• M58: 24,434,568 km (0.088 R)
• M59: 24,679,161 km (0.113 R)
• M60: 25,072,154 km (0.068 R)
• M61: 25,318,841 km (0.109 R)
• M62: 25,368,358 km (0.047 R)
• M63: 25,715,276 km (0.101 R)
• M64: 26,013,873 km (0.114 R)
• M65: 26,113,655 km (0.065 R)
• M66: 26,363,782 km (0.03 R)
• M67: 26,514,128 km (0.108 R)
• M68: 26,815,867 km (0.098 R)
• M69: 27,676,803 km (0.048 R)
• M70: 28,034,043 km (0.079 R)
• M71: 28,752,860 km (0.081 R)
• M72: 29,166,349 km (0.092 R)
• M73: 29,270,020 km (0.12 R)
• M74: 29,529,872 km (0.098 R)
• M75: 29,842,531 km (0.036 R)
• M76: 29,947,100 km (0.099 R)
• M77: 30,734,583 km (0.07 R)
• M78: 30,787,242 km (0.06 R)
• M79: 32,759,839 km (0.118 R)
• M80: 32,813,844 km (0.078 R)
• M81: 33,843,077 km (0.108 R)
• M82: 34,334,357 km (0.07 R)
• M83: 34,608,271 km (0.075 R)
• M84: 35,103,140 km (0.103 R)
• M85: 35,323,947 km (0.103 R)
• M86: 35,600,553 km (0.11 R)
• M87: 35,988,909 km (0.077 R)
• M88: 36,769,810 km (0.059 R)
• M89: 37,050,157 km (0.107 R)
• M90: 37,612,794 km (0.109 R)

Kuiper Belt

Range: 30 - 48 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 296 - 17,136 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit