🌌 Stone's Star System Generator

Planet 1 - Terrestrial

Semi-Major Axis: 3.27 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 1.09

Radius: 1.04

Gravity: 1.01 G

Time & Orbit

Eccentricity (e): 0.058

Orbit Range: 3.08 AU - 3.46 AU

Year: 2252 Days

Day: 25.1 Hours

Environment

Temp: -112 °C

Axial Tilt: 17.6 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Planet 2 - Gas Giant

Semi-Major Axis: 6 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 54.2

Radius: 8

Gravity: 0.85 G

Time & Orbit

Eccentricity (e): 0.023

Orbit Range: 5.86 AU - 6.14 AU

Year: 5597 Days

Day: 9.5 Hours

Environment

Temp: -158 °C

Axial Tilt: 46.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (66)

Outer Limit: 30,645,858 km

• M1: 104,419 km (0.1 R)
• M2: 194,328 km (0.036 R)
• M3: 259,253 km (0.098 R)
• M4: 329,415 km (0.042 R)
• M5: 419,323 km (0.095 R)
• M6: 564,882 km (0.107 R)
• M7: 669,151 km (0.117 R)
• M8: 810,820 km (0.058 R)
• M9: 1,004,251 km (0.054 R)
• M10: 1,185,713 km (0.074 R)
• M11: 1,473,090 km (0.104 R)
• M12: 1,619,995 km (0.106 R)
• M13: 1,865,186 km (0.095 R)
• M14: 1,970,952 km (0.104 R)
• M15: 2,199,537 km (0.083 R)
• M16: 2,436,650 km (0.034 R)
• M17: 2,564,257 km (0.107 R)
• M18: 2,729,862 km (0.066 R)
• M19: 2,826,053 km (0.075 R)
• M20: 3,782,283 km (0.027 R)
• M21: 3,835,839 km (0.059 R)
• M22: 3,930,385 km (0.117 R)
• M23: 4,011,916 km (0.086 R)
• M24: 4,066,669 km (0.078 R)
• M25: 4,288,073 km (0.083 R)
• M26: 4,386,210 km (0.104 R)
• M27: 4,470,882 km (0.06 R)
• M28: 4,584,726 km (0.055 R)
• M29: 4,887,961 km (0.075 R)
• M30: 4,975,775 km (0.112 R)
• M31: 5,138,238 km (0.103 R)
• M32: 5,302,497 km (0.052 R)
• M33: 5,574,914 km (0.041 R)
• M34: 5,666,767 km (0.107 R)
• M35: 5,867,528 km (0.111 R)
• M36: 6,102,097 km (0.084 R)
• M37: 6,307,944 km (0.105 R)
• M38: 6,371,673 km (0.113 R)
• M39: 7,004,920 km (0.046 R)
• M40: 7,253,702 km (0.043 R)
• M41: 7,522,379 km (0.081 R)
• M42: 8,035,051 km (0.076 R)
• M43: 8,243,291 km (0.095 R)
• M44: 8,313,004 km (0.101 R)
• M45: 8,896,436 km (0.11 R)
• M46: 9,021,948 km (0.087 R)
• M47: 9,953,644 km (0.113 R)
• M48: 10,289,790 km (0.093 R)
• M49: 10,440,286 km (0.114 R)
• M50: 10,610,678 km (0.081 R)
• M51: 10,762,819 km (0.116 R)
• M52: 10,877,411 km (0.114 R)
• M53: 11,050,047 km (0.112 R)
• M54: 11,107,791 km (0.108 R)
• M55: 11,475,952 km (0.098 R)
• M56: 11,867,749 km (0.11 R)
• M57: 11,966,334 km (0.097 R)
• M58: 12,085,114 km (0.058 R)
• M59: 12,563,977 km (0.071 R)
• M60: 12,866,464 km (0.112 R)
• M61: 13,130,504 km (0.12 R)
• M62: 13,293,865 km (0.102 R)
• M63: 13,355,350 km (0.099 R)
• M64: 13,499,113 km (0.091 R)
• M65: 13,643,326 km (0.062 R)
• M66: 13,933,396 km (0.06 R)

Planet 3 - Gas Giant

Semi-Major Axis: 10.1 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 379

Radius: 13.2

Gravity: 2.18 G

Time & Orbit

Eccentricity (e): 0.013

Orbit Range: 9.97 AU - 10.23 AU

Year: 12223 Days

Day: 10.2 Hours

Environment

Temp: -187 °C

Axial Tilt: 11.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (85)

Outer Limit: 30,645,858 km

• M1: 175,478 km (0.105 R)
• M2: 330,761 km (0.054 R)
• M3: 522,695 km (0.044 R)
• M4: 758,162 km (0.096 R)
• M5: 872,904 km (0.11 R)
• M6: 1,159,383 km (0.075 R)
• M7: 1,414,897 km (0.116 R)
• M8: 1,539,212 km (0.063 R)
• M9: 1,799,363 km (0.115 R)
• M10: 2,050,688 km (0.102 R)
• M11: 2,387,432 km (0.034 R)
• M12: 2,512,047 km (0.083 R)
• M13: 2,638,906 km (0.101 R)
• M14: 2,846,548 km (0.118 R)
• M15: 2,979,092 km (0.104 R)
• M16: 3,086,653 km (0.088 R)
• M17: 3,195,560 km (0.085 R)
• M18: 3,644,204 km (0.071 R)
• M19: 3,935,022 km (0.105 R)
• M20: 4,233,321 km (0.101 R)
• M21: 5,172,646 km (0.119 R)
• M22: 5,433,993 km (0.106 R)
• M23: 5,766,848 km (0.046 R)
• M24: 6,278,473 km (0.06 R)
• M25: 6,698,544 km (0.03 R)
• M26: 7,055,484 km (0.07 R)
• M27: 7,345,704 km (0.107 R)
• M28: 7,788,215 km (0.117 R)
• M29: 8,468,586 km (0.12 R)
• M30: 11,122,602 km (0.06 R)
• M31: 11,973,963 km (0.09 R)
• M32: 12,146,749 km (0.081 R)
• M33: 12,451,330 km (0.085 R)
• M34: 12,758,305 km (0.118 R)
• M35: 13,290,424 km (0.069 R)
• M36: 13,469,343 km (0.114 R)
• M37: 13,784,546 km (0.106 R)
• M38: 13,875,053 km (0.106 R)
• M39: 13,965,709 km (0.096 R)
• M40: 14,698,440 km (0.082 R)
• M41: 15,631,930 km (0.065 R)
• M42: 16,201,300 km (0.091 R)
• M43: 16,680,911 km (0.084 R)
• M44: 17,116,689 km (0.062 R)
• M45: 17,752,630 km (0.082 R)
• M46: 17,949,949 km (0.112 R)
• M47: 18,048,834 km (0.064 R)
• M48: 18,346,533 km (0.083 R)
• M49: 19,047,848 km (0.105 R)
• M50: 20,321,674 km (0.119 R)
• M51: 20,787,073 km (0.045 R)
• M52: 20,942,954 km (0.079 R)
• M53: 21,518,008 km (0.048 R)
• M54: 21,623,026 km (0.102 R)
• M55: 22,310,428 km (0.058 R)
• M56: 22,416,792 km (0.065 R)
• M57: 24,910,140 km (0.119 R)
• M58: 25,075,745 km (0.094 R)
• M59: 25,463,652 km (0.044 R)
• M60: 25,965,403 km (0.079 R)
• M61: 26,245,450 km (0.12 R)
• M62: 26,639,342 km (0.12 R)
• M63: 28,292,099 km (0.085 R)
• M64: 29,334,497 km (0.047 R)
• M65: 29,509,377 km (0.079 R)
• M66: 29,977,618 km (0.073 R)
• M67: 30,743,858 km (0.08 R)
• M68: 30,980,971 km (0.04 R)
• M69: 31,635,911 km (0.12 R)
• M70: 31,755,589 km (0.082 R)
• M71: 33,080,876 km (0.116 R)
• M72: 33,567,369 km (0.077 R)
• M73: 34,117,440 km (0.088 R)
• M74: 35,412,658 km (0.107 R)
• M75: 35,723,373 km (0.081 R)
• M76: 36,034,985 km (0.118 R)
• M77: 39,265,103 km (0.116 R)
• M78: 41,338,679 km (0.046 R)
• M79: 42,388,856 km (0.085 R)
• M80: 42,520,652 km (0.097 R)
• M81: 42,983,358 km (0.116 R)
• M82: 43,647,273 km (0.11 R)
• M83: 43,913,707 km (0.114 R)
• M84: 44,783,619 km (0.103 R)
• M85: 44,985,127 km (0.078 R)

Planet 4 - Gas Giant

Semi-Major Axis: 10.91 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 511.3

Radius: 13.2

Gravity: 2.93 G

Time & Orbit

Eccentricity (e): 0.248

Orbit Range: 8.2 AU - 13.62 AU

Year: 13723 Days

Day: 8.4 Hours

Environment

Temp: -187 °C

Axial Tilt: 40 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (89)

Outer Limit: 30,645,858 km

• M1: 338,839 km (0.113 R)
• M2: 442,361 km (0.112 R)
• M3: 545,135 km (0.051 R)
• M4: 675,135 km (0.1 R)
• M5: 762,650 km (0.087 R)
• M6: 950,844 km (0.066 R)
• M7: 1,134,401 km (0.118 R)
• M8: 1,514,230 km (0.115 R)
• M9: 1,907,971 km (0.11 R)
• M10: 2,702,186 km (0.108 R)
• M11: 2,908,332 km (0.113 R)
• M12: 3,242,833 km (0.113 R)
• M13: 4,116,485 km (0.114 R)
• M14: 4,389,052 km (0.106 R)
• M15: 4,597,292 km (0.109 R)
• M16: 4,951,989 km (0.032 R)
• M17: 5,315,512 km (0.093 R)
• M18: 5,877,102 km (0.093 R)
• M19: 6,145,780 km (0.078 R)
• M20: 6,418,497 km (0.088 R)
• M21: 7,016,439 km (0.041 R)
• M22: 7,549,157 km (0.105 R)
• M23: 8,740,854 km (0.045 R)
• M24: 8,872,051 km (0.099 R)
• M25: 10,311,632 km (0.104 R)
• M26: 10,729,608 km (0.113 R)
• M27: 10,870,080 km (0.085 R)
• M28: 11,774,549 km (0.115 R)
• M29: 12,162,606 km (0.069 R)
• M30: 12,309,212 km (0.118 R)
• M31: 13,352,059 km (0.084 R)
• M32: 14,268,495 km (0.056 R)
• M33: 14,890,673 km (0.113 R)
• M34: 15,099,960 km (0.116 R)
• M35: 15,787,213 km (0.114 R)
• M36: 16,054,245 km (0.094 R)
• M37: 16,161,507 km (0.08 R)
• M38: 16,538,793 km (0.073 R)
• M39: 17,247,139 km (0.11 R)
• M40: 17,577,451 km (0.117 R)
• M41: 17,743,355 km (0.093 R)
• M42: 17,909,707 km (0.094 R)
• M43: 18,188,408 km (0.086 R)
• M44: 18,749,849 km (0.081 R)
• M45: 19,545,411 km (0.1 R)
• M46: 20,352,192 km (0.099 R)
• M47: 21,110,952 km (0.044 R)
• M48: 22,296,515 km (0.077 R)
• M49: 22,716,586 km (0.087 R)
• M50: 24,237,997 km (0.091 R)
• M51: 24,422,750 km (0.105 R)
• M52: 24,731,819 km (0.116 R)
• M53: 24,917,769 km (0.083 R)
• M54: 25,917,831 km (0.072 R)
• M55: 27,763,869 km (0.088 R)
• M56: 27,957,149 km (0.112 R)
• M57: 28,280,580 km (0.082 R)
• M58: 28,475,057 km (0.081 R)
• M59: 28,930,882 km (0.105 R)
• M60: 29,126,855 km (0.068 R)
• M61: 29,323,427 km (0.081 R)
• M62: 30,445,261 km (0.093 R)
• M63: 31,985,371 km (0.046 R)
• M64: 32,730,967 km (0.105 R)
• M65: 33,139,968 km (0.119 R)
• M66: 33,688,094 km (0.092 R)
• M67: 34,032,169 km (0.077 R)
• M68: 34,654,347 km (0.107 R)
• M69: 35,001,713 km (0.107 R)
• M70: 35,980,382 km (0.053 R)
• M71: 36,614,228 km (0.099 R)
• M72: 37,893,141 km (0.084 R)
• M73: 39,186,713 km (0.1 R)
• M74: 39,766,256 km (0.045 R)
• M75: 40,202,782 km (0.096 R)
• M76: 40,933,717 km (0.117 R)
• M77: 41,448,184 km (0.109 R)
• M78: 43,078,652 km (0.099 R)
• M79: 44,503,571 km (0.101 R)
• M80: 44,881,156 km (0.114 R)
• M81: 45,032,549 km (0.061 R)
• M82: 45,791,759 km (0.117 R)
• M83: 48,017,177 km (0.083 R)
• M84: 48,948,423 km (0.11 R)
• M85: 50,199,211 km (0.104 R)
• M86: 50,986,395 km (0.09 R)
• M87: 51,539,758 km (0.063 R)
• M88: 52,095,215 km (0.106 R)
• M89: 53,372,182 km (0.107 R)

Planet 5 - Ice Giant

Semi-Major Axis: 12.67 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 84.8

Radius: 7.6

Gravity: 1.47 G

Time & Orbit

Eccentricity (e): 0.176

Orbit Range: 10.44 AU - 14.9 AU

Year: 17174 Days

Day: 21.2 Hours

Environment

Temp: -189 °C

Axial Tilt: 28.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (51)

Outer Limit: 30,645,858 km

• M1: 110,403 km (0.078 R)
• M2: 609,163 km (0.114 R)
• M3: 1,426,864 km (0.109 R)
• M4: 1,770,341 km (0.104 R)
• M5: 2,039,767 km (0.097 R)
• M6: 2,322,208 km (0.105 R)
• M7: 2,384,291 km (0.05 R)
• M8: 2,574,280 km (0.11 R)
• M9: 2,703,533 km (0.102 R)
• M10: 3,668,140 km (0.106 R)
• M11: 3,936,967 km (0.09 R)
• M12: 4,390,698 km (0.066 R)
• M13: 4,649,951 km (0.051 R)
• M14: 4,887,662 km (0.075 R)
• M15: 5,129,262 km (0.119 R)
• M16: 5,374,902 km (0.064 R)
• M17: 5,764,604 km (0.095 R)
• M18: 6,307,944 km (0.094 R)
• M19: 6,927,578 km (0.064 R)
• M20: 7,597,328 km (0.044 R)
• M21: 7,940,057 km (0.109 R)
• M22: 8,192,428 km (0.073 R)
• M23: 8,672,787 km (0.115 R)
• M24: 9,627,221 km (0.064 R)
• M25: 11,102,855 km (0.092 R)
• M26: 11,992,813 km (0.103 R)
• M27: 12,391,640 km (0.091 R)
• M28: 13,053,611 km (0.103 R)
• M29: 14,758,279 km (0.068 R)
• M30: 15,538,132 km (0.099 R)
• M31: 15,853,784 km (0.098 R)
• M32: 17,586,726 km (0.109 R)
• M33: 17,833,413 km (0.083 R)
• M34: 18,080,997 km (0.069 R)
• M35: 18,413,104 km (0.109 R)
• M36: 18,579,906 km (0.082 R)
• M37: 18,999,079 km (0.072 R)
• M38: 19,083,303 km (0.032 R)
• M39: 19,633,673 km (0.066 R)
• M40: 19,718,795 km (0.109 R)
• M41: 20,447,336 km (0.09 R)
• M42: 21,010,572 km (0.113 R)
• M43: 21,184,854 km (0.113 R)
• M44: 21,666,708 km (0.083 R)
• M45: 22,373,858 km (0.041 R)
• M46: 23,539,225 km (0.11 R)
• M47: 24,540,633 km (0.077 R)
• M48: 29,459,411 km (0.076 R)
• M49: 31,479,581 km (0.09 R)
• M50: 32,481,288 km (0.103 R)
• M51: 32,834,339 km (0.072 R)

Planet 6 - Ice Giant

Semi-Major Axis: 15.37 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 619.2

Radius: 7.7

Gravity: 10.44 G

Time & Orbit

Eccentricity (e): 0.004

Orbit Range: 15.31 AU - 15.43 AU

Year: 22946 Days

Day: 16.8 Hours

Environment

Temp: -204 °C

Axial Tilt: 160.3 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (92)

Outer Limit: 30,645,858 km

• M1: 102,923 km (0.117 R)
• M2: 176,226 km (0.086 R)
• M3: 274,213 km (0.109 R)
• M4: 358,586 km (0.103 R)
• M5: 535,261 km (0.091 R)
• M6: 715,975 km (0.055 R)
• M7: 788,979 km (0.074 R)
• M8: 1,399,638 km (0.108 R)
• M9: 1,619,247 km (0.034 R)
• M10: 1,716,935 km (0.09 R)
• M11: 2,233,945 km (0.109 R)
• M12: 2,343,002 km (0.066 R)
• M13: 2,680,644 km (0.112 R)
• M14: 3,318,679 km (0.039 R)
• M15: 3,401,706 km (0.111 R)
• M16: 4,046,024 km (0.096 R)
• M17: 4,774,266 km (0.075 R)
• M18: 5,153,497 km (0.11 R)
• M19: 5,249,838 km (0.114 R)
• M20: 6,245,861 km (0.116 R)
• M21: 6,400,246 km (0.112 R)
• M22: 6,923,988 km (0.057 R)
• M23: 7,901,161 km (0.111 R)
• M24: 8,012,312 km (0.12 R)
• M25: 8,519,300 km (0.06 R)
• M26: 9,036,759 km (0.104 R)
• M27: 9,742,412 km (0.118 R)
• M28: 10,649,274 km (0.112 R)
• M29: 11,019,529 km (0.065 R)
• M30: 12,933,484 km (0.112 R)
• M31: 13,328,572 km (0.104 R)
• M32: 13,461,116 km (0.039 R)
• M33: 15,710,619 km (0.107 R)
• M34: 15,991,115 km (0.102 R)
• M35: 16,770,968 km (0.078 R)
• M36: 18,000,513 km (0.04 R)
• M37: 18,147,119 km (0.068 R)
• M38: 19,333,730 km (0.054 R)
• M39: 20,468,878 km (0.086 R)
• M40: 20,852,148 km (0.087 R)
• M41: 21,781,450 km (0.06 R)
• M42: 22,566,091 km (0.041 R)
• M43: 23,440,042 km (0.044 R)
• M44: 24,082,564 km (0.099 R)
• M45: 25,713,929 km (0.06 R)
• M46: 26,626,327 km (0.086 R)
• M47: 27,549,345 km (0.082 R)
• M48: 28,312,295 km (0.06 R)
• M49: 28,653,677 km (0.036 R)
• M50: 31,256,680 km (0.067 R)
• M51: 32,141,103 km (0.113 R)
• M52: 33,392,938 km (0.07 R)
• M53: 34,387,763 km (0.12 R)
• M54: 35,392,313 km (0.059 R)
• M55: 35,944,329 km (0.062 R)
• M56: 37,336,637 km (0.095 R)
• M57: 37,430,135 km (0.049 R)
• M58: 39,600,950 km (0.101 R)
• M59: 40,749,712 km (0.036 R)
• M60: 42,200,961 km (0.102 R)
• M61: 43,275,971 km (0.073 R)
• M62: 43,570,679 km (0.09 R)
• M63: 46,153,037 km (0.105 R)
• M64: 46,655,238 km (0.063 R)
• M65: 47,159,233 km (0.112 R)
• M66: 48,376,361 km (0.119 R)
• M67: 51,568,181 km (0.093 R)
• M68: 53,031,847 km (0.056 R)
• M69: 54,615,041 km (0.072 R)
• M70: 55,252,777 km (0.118 R)
• M71: 61,542,470 km (0.094 R)
• M72: 61,873,979 km (0.077 R)
• M73: 62,427,640 km (0.072 R)
• M74: 65,333,429 km (0.105 R)
• M75: 65,446,076 km (0.116 R)
• M76: 65,671,520 km (0.1 R)
• M77: 66,916,324 km (0.081 R)
• M78: 68,168,758 km (0.082 R)
• M79: 68,283,050 km (0.091 R)
• M80: 68,740,670 km (0.082 R)
• M81: 68,969,854 km (0.047 R)
• M82: 70,004,473 km (0.109 R)
• M83: 71,044,029 km (0.048 R)
• M84: 71,159,967 km (0.076 R)
• M85: 71,275,756 km (0.108 R)
• M86: 72,088,820 km (0.036 R)
• M87: 72,438,281 km (0.096 R)
• M88: 73,255,684 km (0.11 R)
• M89: 74,781,881 km (0.098 R)
• M90: 75,017,498 km (0.103 R)
• M91: 75,607,961 km (0.05 R)
• M92: 77,269,245 km (0.077 R)

Planet 7 - Ice Giant

Semi-Major Axis: 16.17 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 29.2

Radius: 4

Gravity: 1.83 G

Time & Orbit

Eccentricity (e): 0.225

Orbit Range: 12.53 AU - 19.81 AU

Year: 24761 Days

Day: 18.5 Hours

Environment

Temp: -208 °C

Axial Tilt: 33.3 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (42)

Outer Limit: 30,645,858 km

• M1: 444,455 km (0.119 R)
• M2: 545,135 km (0.116 R)
• M3: 794,664 km (0.095 R)
• M4: 1,150,856 km (0.106 R)
• M5: 1,467,406 km (0.084 R)
• M6: 1,827,188 km (0.076 R)
• M7: 2,251,298 km (0.068 R)
• M8: 2,484,372 km (0.08 R)
• M9: 2,910,427 km (0.055 R)
• M10: 3,185,387 km (0.091 R)
• M11: 4,247,233 km (0.111 R)
• M12: 5,127,617 km (0.06 R)
• M13: 5,330,621 km (0.076 R)
• M14: 5,614,258 km (0.105 R)
• M15: 5,692,349 km (0.066 R)
• M16: 6,521,270 km (0.067 R)
• M17: 6,991,756 km (0.1 R)
• M18: 7,301,872 km (0.08 R)
• M19: 7,994,061 km (0.071 R)
• M20: 8,646,907 km (0.119 R)
• M21: 9,939,731 km (0.091 R)
• M22: 10,034,427 km (0.113 R)
• M23: 10,129,421 km (0.05 R)
• M24: 10,447,915 km (0.114 R)
• M25: 12,056,092 km (0.039 R)
• M26: 12,461,652 km (0.099 R)
• M27: 13,181,816 km (0.117 R)
• M28: 13,320,643 km (0.079 R)
• M29: 13,459,769 km (0.118 R)
• M30: 15,422,194 km (0.052 R)
• M31: 18,470,251 km (0.056 R)
• M32: 18,664,279 km (0.118 R)
• M33: 19,962,190 km (0.095 R)
• M34: 20,642,262 km (0.066 R)
• M35: 21,574,107 km (0.118 R)
• M36: 22,851,823 km (0.086 R)
• M37: 25,652,444 km (0.105 R)
• M38: 26,391,159 km (0.092 R)
• M39: 26,741,218 km (0.102 R)
• M40: 27,844,951 km (0.107 R)
• M41: 28,559,131 km (0.099 R)
• M42: 28,873,586 km (0.11 R)

Kuiper Belt

Range: 30 - 56 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 198 - 11,616 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit