🌌 Stone's Star System Generator

Planet 1 - Terrestrial

Semi-Major Axis: 0.53 AU

Status: Inner (Hot)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 0.49

Radius: 0.75

Gravity: 0.87 G

Time & Orbit

Eccentricity (e): 0.222

Orbit Range: 0.41 AU - 0.65 AU

Year: 142 Days

Day: 35.1 Hours

Environment

Temp: 223 °C

Axial Tilt: 122.8 °

Atmosphere: Dense CO₂

Biome: Volcanic/Barren

Planet 2 - Terrestrial

Semi-Major Axis: 1.08 AU

Status: HZ

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 1.06

Radius: 1.02

Gravity: 1.02 G

Time & Orbit

Eccentricity (e): 0.21

Orbit Range: 0.85 AU - 1.31 AU

Year: 412 Days

Day: 26.7 Hours

Environment

Temp: 24 °C

Axial Tilt: 19.3 °

Atmosphere: N₂, O₂

Biome: Arid/Tundra

Planet 3 - Terrestrial

Semi-Major Axis: 1.41 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 2.79

Radius: 1.51

Gravity: 1.22 G

Time & Orbit

Eccentricity (e): 0.098

Orbit Range: 1.27 AU - 1.55 AU

Year: 615 Days

Day: 45.2 Hours

Environment

Temp: -26 °C

Axial Tilt: 38.8 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Satellites (1)

Outer Limit: 52,086,937 km

• M1: 315,951 km (0.084 R)

Planet 4 - Terrestrial

Semi-Major Axis: 1.43 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 2.75

Radius: 1.5

Gravity: 1.22 G

Time & Orbit

Eccentricity (e): 0.131

Orbit Range: 1.24 AU - 1.62 AU

Year: 628 Days

Day: 23.7 Hours

Environment

Temp: -39 °C

Axial Tilt: 17.8 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Planet 5 - Terrestrial

Semi-Major Axis: 1.81 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 3.39

Radius: 1.63

Gravity: 1.28 G

Time & Orbit

Eccentricity (e): 0.002

Orbit Range: 1.81 AU - 1.81 AU

Year: 894 Days

Day: 34.3 Hours

Environment

Temp: -67 °C

Axial Tilt: 11.3 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Satellites (1)

Outer Limit: 52,086,937 km

• M1: 441,463 km (0.113 R)

Planet 6 - Gas Giant

Semi-Major Axis: 5.5 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 134.2

Radius: 10.4

Gravity: 1.24 G

Time & Orbit

Eccentricity (e): 0.098

Orbit Range: 4.96 AU - 6.04 AU

Year: 4735 Days

Day: 5.7 Hours

Environment

Temp: -147 °C

Axial Tilt: 25.8 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (65)

Outer Limit: 52,086,937 km

• M1: 180,415 km (0.048 R)
• M2: 273,764 km (0.115 R)
• M3: 357,689 km (0.053 R)
• M4: 537,954 km (0.065 R)
• M5: 700,417 km (0.119 R)
• M6: 809,624 km (0.103 R)
• M7: 1,046,437 km (0.099 R)
• M8: 1,114,055 km (0.049 R)
• M9: 1,243,906 km (0.073 R)
• M10: 1,411,007 km (0.038 R)
• M11: 1,541,307 km (0.08 R)
• M12: 1,687,015 km (0.111 R)
• M13: 1,755,980 km (0.072 R)
• M14: 1,884,784 km (0.027 R)
• M15: 1,956,441 km (0.088 R)
• M16: 2,102,598 km (0.041 R)
• M17: 2,763,821 km (0.09 R)
• M18: 3,253,155 km (0.092 R)
• M19: 3,412,627 km (0.096 R)
• M20: 3,604,411 km (0.068 R)
• M21: 3,709,130 km (0.09 R)
• M22: 3,799,786 km (0.066 R)
• M23: 3,952,525 km (0.118 R)
• M24: 4,423,011 km (0.114 R)
• M25: 4,632,298 km (0.105 R)
• M26: 4,713,829 km (0.065 R)
• M27: 4,960,965 km (0.098 R)
• M28: 5,348,273 km (0.117 R)
• M29: 5,485,305 km (0.101 R)
• M30: 6,009,646 km (0.089 R)
• M31: 6,134,261 km (0.108 R)
• M32: 6,205,918 km (0.103 R)
• M33: 6,313,928 km (0.107 R)
• M34: 6,659,948 km (0.098 R)
• M35: 6,881,801 km (0.117 R)
• M36: 7,030,950 km (0.12 R)
• M37: 7,446,832 km (0.106 R)
• M38: 7,619,319 km (0.089 R)
• M39: 7,715,809 km (0.032 R)
• M40: 7,812,599 km (0.097 R)
• M41: 8,007,376 km (0.109 R)
• M42: 8,125,109 km (0.063 R)
• M43: 8,342,325 km (0.096 R)
• M44: 9,148,508 km (0.065 R)
• M45: 9,230,488 km (0.086 R)
• M46: 9,415,840 km (0.068 R)
• M47: 9,727,602 km (0.037 R)
• M48: 9,874,207 km (0.07 R)
• M49: 10,021,711 km (0.066 R)
• M50: 10,148,570 km (0.069 R)
• M51: 11,008,309 km (0.103 R)
• M52: 11,095,524 km (0.103 R)
• M53: 11,205,030 km (0.038 R)
• M54: 11,270,853 km (0.115 R)
• M55: 12,025,724 km (0.079 R)
• M56: 13,050,021 km (0.112 R)
• M57: 13,258,111 km (0.083 R)
• M58: 14,554,377 km (0.098 R)
• M59: 14,626,184 km (0.073 R)
• M60: 14,842,502 km (0.026 R)
• M61: 15,156,957 km (0.075 R)
• M62: 15,890,585 km (0.117 R)
• M63: 16,113,037 km (0.117 R)
• M64: 16,311,553 km (0.072 R)
• M65: 16,636,031 km (0.11 R)

Planet 7 - Gas Giant

Semi-Major Axis: 6.79 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 70.5

Radius: 12.6

Gravity: 0.44 G

Time & Orbit

Eccentricity (e): 0.194

Orbit Range: 5.47 AU - 8.11 AU

Year: 6495 Days

Day: 13.7 Hours

Environment

Temp: -156 °C

Axial Tilt: 22.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (63)

Outer Limit: 52,086,937 km

• M1: 164,408 km (0.052 R)
• M2: 332,257 km (0.101 R)
• M3: 426,952 km (0.097 R)
• M4: 570,267 km (0.111 R)
• M5: 732,730 km (0.076 R)
• M6: 885,470 km (0.055 R)
• M7: 966,253 km (0.074 R)
• M8: 1,087,726 km (0.073 R)
• M9: 1,175,241 km (0.066 R)
• M10: 1,368,073 km (0.054 R)
• M11: 1,571,825 km (0.109 R)
• M12: 1,683,275 km (0.058 R)
• M13: 2,045,900 km (0.062 R)
• M14: 2,736,295 km (0.12 R)
• M15: 2,954,259 km (0.041 R)
• M16: 3,037,435 km (0.102 R)
• M17: 3,334,985 km (0.041 R)
• M18: 3,852,295 km (0.061 R)
• M19: 4,004,735 km (0.103 R)
• M20: 4,174,828 km (0.075 R)
• M21: 4,410,744 km (0.081 R)
• M22: 4,586,521 km (0.094 R)
• M23: 4,879,284 km (0.106 R)
• M24: 4,978,168 km (0.084 R)
• M25: 5,127,916 km (0.093 R)
• M26: 5,228,595 km (0.059 R)
• M27: 5,863,937 km (0.109 R)
• M28: 6,128,426 km (0.068 R)
• M29: 6,578,267 km (0.112 R)
• M30: 6,816,427 km (0.068 R)
• M31: 7,301,423 km (0.109 R)
• M32: 7,816,788 km (0.084 R)
• M33: 8,088,757 km (0.064 R)
• M34: 8,284,880 km (0.072 R)
• M35: 8,443,005 km (0.041 R)
• M36: 8,923,363 km (0.082 R)
• M37: 9,105,723 km (0.095 R)
• M38: 9,453,688 km (0.112 R)
• M39: 9,952,447 km (0.083 R)
• M40: 10,417,098 km (0.083 R)
• M41: 10,609,331 km (0.088 R)
• M42: 10,695,201 km (0.119 R)
• M43: 10,781,219 km (0.104 R)
• M44: 11,367,942 km (0.083 R)
• M45: 11,587,851 km (0.07 R)
• M46: 12,323,723 km (0.1 R)
• M47: 12,481,848 km (0.075 R)
• M48: 12,960,112 km (0.104 R)
• M49: 13,166,857 km (0.072 R)
• M50: 13,467,548 km (0.055 R)
• M51: 13,583,786 km (0.061 R)
• M52: 13,817,308 km (0.106 R)
• M53: 14,028,690 km (0.056 R)
• M54: 14,170,060 km (0.099 R)
• M55: 14,621,247 km (0.107 R)
• M56: 14,836,668 km (0.1 R)
• M57: 14,956,646 km (0.073 R)
• M58: 15,052,987 km (0.118 R)
• M59: 15,173,712 km (0.12 R)
• M60: 15,684,140 km (0.066 R)
• M61: 15,929,181 km (0.098 R)
• M62: 16,373,487 km (0.111 R)
• M63: 16,746,734 km (0.113 R)

Planet 8 - Gas Giant

Semi-Major Axis: 11.93 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 650.9

Radius: 13.4

Gravity: 3.62 G

Time & Orbit

Eccentricity (e): 0.24

Orbit Range: 9.07 AU - 14.79 AU

Year: 15126 Days

Day: 10.9 Hours

Environment

Temp: -182 °C

Axial Tilt: 39.3 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (85)

Outer Limit: 52,086,937 km

• M1: 228,586 km (0.12 R)
• M2: 426,204 km (0.042 R)
• M3: 965,505 km (0.116 R)
• M4: 1,169,407 km (0.107 R)
• M5: 1,567,935 km (0.063 R)
• M6: 2,550,344 km (0.052 R)
• M7: 2,870,783 km (0.075 R)
• M8: 3,375,975 km (0.062 R)
• M9: 3,657,070 km (0.068 R)
• M10: 4,661,619 km (0.111 R)
• M11: 6,557,024 km (0.099 R)
• M12: 7,311,895 km (0.05 R)
• M13: 7,722,840 km (0.067 R)
• M14: 7,954,268 km (0.09 R)
• M15: 8,519,449 km (0.118 R)
• M16: 9,048,876 km (0.115 R)
• M17: 9,391,455 km (0.05 R)
• M18: 9,788,189 km (0.102 R)
• M19: 10,495,637 km (0.102 R)
• M20: 10,803,958 km (0.058 R)
• M21: 10,959,241 km (0.056 R)
• M22: 11,272,050 km (0.118 R)
• M23: 12,120,719 km (0.056 R)
• M24: 12,444,299 km (0.114 R)
• M25: 12,552,757 km (0.106 R)
• M26: 14,217,782 km (0.087 R)
• M27: 14,903,089 km (0.085 R)
• M28: 15,191,813 km (0.092 R)
• M29: 15,365,945 km (0.11 R)
• M30: 16,069,205 km (0.111 R)
• M31: 16,484,339 km (0.116 R)
• M32: 17,023,191 km (0.042 R)
• M33: 17,204,204 km (0.096 R)
• M34: 18,179,881 km (0.112 R)
• M35: 19,048,446 km (0.098 R)
• M36: 20,184,941 km (0.09 R)
• M37: 21,019,398 km (0.106 R)
• M38: 21,734,327 km (0.116 R)
• M39: 22,788,543 km (0.116 R)
• M40: 23,657,258 km (0.087 R)
• M41: 23,859,215 km (0.041 R)
• M42: 27,876,217 km (0.108 R)
• M43: 28,160,902 km (0.117 R)
• M44: 29,454,026 km (0.098 R)
• M45: 29,816,501 km (0.105 R)
• M46: 32,396,167 km (0.056 R)
• M47: 32,845,409 km (0.102 R)
• M48: 32,995,755 km (0.115 R)
• M49: 35,046,443 km (0.117 R)
• M50: 35,816,273 km (0.09 R)
• M51: 36,669,729 km (0.108 R)
• M52: 38,080,587 km (0.113 R)
• M53: 38,475,675 km (0.081 R)
• M54: 38,634,099 km (0.104 R)
• M55: 38,792,673 km (0.103 R)
• M56: 38,951,546 km (0.043 R)
• M57: 39,190,304 km (0.078 R)
• M58: 39,509,246 km (0.07 R)
• M59: 40,149,825 km (0.073 R)
• M60: 40,793,843 km (0.077 R)
• M61: 42,418,775 km (0.117 R)
• M62: 42,992,483 km (0.065 R)
• M63: 45,647,995 km (0.067 R)
• M64: 46,657,332 km (0.058 R)
• M65: 46,741,855 km (0.1 R)
• M66: 47,080,095 km (0.099 R)
• M67: 47,419,234 km (0.081 R)
• M68: 48,270,745 km (0.115 R)
• M69: 50,594,598 km (0.073 R)
• M70: 50,681,365 km (0.094 R)
• M71: 53,042,917 km (0.105 R)
• M72: 53,572,493 km (0.084 R)
• M73: 55,082,684 km (0.052 R)
• M74: 55,171,994 km (0.079 R)
• M75: 55,261,304 km (0.1 R)
• M76: 56,967,468 km (0.12 R)
• M77: 57,328,896 km (0.036 R)
• M78: 57,600,416 km (0.059 R)
• M79: 58,599,730 km (0.093 R)
• M80: 58,690,835 km (0.1 R)
• M81: 58,873,344 km (0.108 R)
• M82: 59,421,621 km (0.098 R)
• M83: 60,892,317 km (0.059 R)
• M84: 61,169,373 km (0.113 R)
• M85: 62,095,982 km (0.108 R)

Planet 9 - Ice Giant

Semi-Major Axis: 15.04 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 83.1

Radius: 3.9

Gravity: 5.46 G

Time & Orbit

Eccentricity (e): 0.203

Orbit Range: 11.99 AU - 18.09 AU

Year: 21411 Days

Day: 18.2 Hours

Environment

Temp: -193 °C

Axial Tilt: 29.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (98)

Outer Limit: 52,086,937 km

• M1: 54,902 km (0.116 R)
• M2: 411,843 km (0.101 R)
• M3: 449,691 km (0.072 R)
• M4: 809,175 km (0.094 R)
• M5: 841,039 km (0.112 R)
• M6: 922,720 km (0.086 R)
• M7: 1,274,873 km (0.086 R)
• M8: 1,368,970 km (0.084 R)
• M9: 2,044,853 km (0.082 R)
• M10: 2,177,397 km (0.086 R)
• M11: 2,544,660 km (0.113 R)
• M12: 2,735,397 km (0.112 R)
• M13: 2,881,405 km (0.051 R)
• M14: 3,232,212 km (0.083 R)
• M15: 3,464,687 km (0.088 R)
• M16: 3,676,068 km (0.055 R)
• M17: 3,702,697 km (0.094 R)
• M18: 4,083,423 km (0.091 R)
• M19: 4,793,714 km (0.078 R)
• M20: 4,999,262 km (0.091 R)
• M21: 5,358,596 km (0.1 R)
• M22: 5,388,814 km (0.082 R)
• M23: 5,449,701 km (0.105 R)
• M24: 5,881,590 km (0.109 R)
• M25: 5,912,856 km (0.12 R)
• M26: 5,975,687 km (0.079 R)
• M27: 6,070,083 km (0.1 R)
• M28: 8,165,650 km (0.096 R)
• M29: 8,235,512 km (0.098 R)
• M30: 8,375,835 km (0.101 R)
• M31: 8,552,361 km (0.116 R)
• M32: 8,730,233 km (0.111 R)
• M33: 8,801,591 km (0.103 R)
• M34: 8,873,248 km (0.113 R)
• M35: 9,053,214 km (0.074 R)
• M36: 9,161,822 km (0.036 R)
• M37: 9,343,733 km (0.041 R)
• M38: 9,380,235 km (0.104 R)
• M39: 9,933,747 km (0.062 R)
• M40: 10,008,397 km (0.108 R)
• M41: 10,726,467 km (0.096 R)
• M42: 11,072,337 km (0.112 R)
• M43: 11,227,171 km (0.094 R)
• M44: 11,460,842 km (0.12 R)
• M45: 11,933,123 km (0.082 R)
• M46: 12,492,021 km (0.106 R)
• M47: 12,937,074 km (0.109 R)
• M48: 13,059,445 km (0.084 R)
• M49: 13,305,085 km (0.112 R)
• M50: 13,552,370 km (0.108 R)
• M51: 13,967,953 km (0.101 R)
• M52: 15,067,647 km (0.119 R)
• M53: 15,325,255 km (0.037 R)
• M54: 15,368,339 km (0.102 R)
• M55: 15,845,107 km (0.034 R)
• M56: 16,991,027 km (0.115 R)
• M57: 18,300,308 km (0.083 R)
• M58: 18,346,084 km (0.076 R)
• M59: 18,391,712 km (0.094 R)
• M60: 19,594,927 km (0.099 R)
• M61: 19,735,400 km (0.062 R)
• M62: 20,111,489 km (0.088 R)
• M63: 20,158,762 km (0.098 R)
• M64: 20,632,688 km (0.117 R)
• M65: 21,110,204 km (0.107 R)
• M66: 21,158,225 km (0.097 R)
• M67: 21,639,781 km (0.111 R)
• M68: 21,688,101 km (0.113 R)
• M69: 22,320,002 km (0.058 R)
• M70: 22,859,452 km (0.077 R)
• M71: 23,105,990 km (0.08 R)
• M72: 23,751,355 km (0.119 R)
• M73: 23,851,137 km (0.112 R)
• M74: 24,301,875 km (0.055 R)
• M75: 24,755,605 km (0.057 R)
• M76: 24,856,733 km (0.067 R)
• M77: 25,059,588 km (0.11 R)
• M78: 25,517,806 km (0.108 R)
• M79: 28,377,968 km (0.111 R)
• M80: 28,749,270 km (0.118 R)
• M81: 30,250,185 km (0.11 R)
• M82: 30,955,689 km (0.096 R)
• M83: 31,283,159 km (0.074 R)
• M84: 31,502,020 km (0.029 R)
• M85: 32,937,562 km (0.103 R)
• M86: 34,112,354 km (0.108 R)
• M87: 34,281,399 km (0.11 R)
• M88: 35,300,909 km (0.095 R)
• M89: 35,585,893 km (0.091 R)
• M90: 35,871,625 km (0.051 R)
• M91: 36,158,105 km (0.106 R)
• M92: 36,906,543 km (0.088 R)
• M93: 37,369,698 km (0.112 R)
• M94: 37,660,217 km (0.108 R)
• M95: 38,009,677 km (0.045 R)
• M96: 38,888,116 km (0.111 R)
• M97: 39,182,525 km (0.093 R)
• M98: 39,418,441 km (0.083 R)

Planet 10 - Ice Giant

Semi-Major Axis: 15.49 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 175.5

Radius: 4.7

Gravity: 7.94 G

Time & Orbit

Eccentricity (e): 0.124

Orbit Range: 13.57 AU - 17.41 AU

Year: 22379 Days

Day: 20.8 Hours

Environment

Temp: -198 °C

Axial Tilt: 24.8 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (76)

Outer Limit: 52,086,937 km

• M1: 264,040 km (0.095 R)
• M2: 443,857 km (0.105 R)
• M3: 785,239 km (0.119 R)
• M4: 1,213,688 km (0.11 R)
• M5: 1,325,138 km (0.113 R)
• M6: 1,370,616 km (0.118 R)
• M7: 2,061,010 km (0.095 R)
• M8: 2,221,229 km (0.049 R)
• M9: 2,582,059 km (0.096 R)
• M10: 3,513,904 km (0.054 R)
• M11: 3,834,792 km (0.106 R)
• M12: 3,932,778 km (0.049 R)
• M13: 4,131,444 km (0.103 R)
• M14: 4,747,040 km (0.076 R)
• M15: 4,958,421 km (0.077 R)
• M16: 5,317,756 km (0.079 R)
• M17: 5,500,564 km (0.118 R)
• M18: 6,213,996 km (0.089 R)
• M19: 6,367,933 km (0.101 R)
• M20: 6,445,275 km (0.111 R)
• M21: 6,718,740 km (0.093 R)
• M22: 7,479,894 km (0.103 R)
• M23: 7,684,693 km (0.107 R)
• M24: 7,891,288 km (0.064 R)
• M25: 8,267,975 km (0.073 R)
• M26: 8,437,170 km (0.081 R)
• M27: 10,282,310 km (0.06 R)
• M28: 11,109,886 km (0.111 R)
• M29: 11,343,408 km (0.107 R)
• M30: 11,768,116 km (0.06 R)
• M31: 11,863,111 km (0.078 R)
• M32: 11,910,833 km (0.115 R)
• M33: 13,717,377 km (0.041 R)
• M34: 14,119,047 km (0.05 R)
• M35: 14,473,744 km (0.041 R)
• M36: 14,728,958 km (0.082 R)
• M37: 15,347,246 km (0.119 R)
• M38: 15,711,965 km (0.113 R)
• M39: 15,921,552 km (0.093 R)
• M40: 16,237,802 km (0.102 R)
• M41: 16,396,675 km (0.108 R)
• M42: 17,795,116 km (0.105 R)
• M43: 19,399,403 km (0.05 R)
• M44: 19,568,000 km (0.083 R)
• M45: 20,133,480 km (0.092 R)
• M46: 20,704,196 km (0.098 R)
• M47: 21,920,277 km (0.108 R)
• M48: 21,978,770 km (0.102 R)
• M49: 22,271,832 km (0.092 R)
• M50: 22,507,299 km (0.11 R)
• M51: 23,577,223 km (0.079 R)
• M52: 24,968,184 km (0.103 R)
• M53: 25,396,782 km (0.088 R)
• M54: 26,013,275 km (0.11 R)
• M55: 27,198,090 km (0.077 R)
• M56: 28,209,371 km (0.066 R)
• M57: 28,336,679 km (0.117 R)
• M58: 29,943,809 km (0.073 R)
• M59: 33,312,753 km (0.095 R)
• M60: 33,716,817 km (0.114 R)
• M61: 34,258,212 km (0.097 R)
• M62: 35,075,764 km (0.057 R)
• M63: 36,452,513 km (0.098 R)
• M64: 37,077,832 km (0.112 R)
• M65: 39,756,681 km (0.073 R)
• M66: 41,842,674 km (0.059 R)
• M67: 41,915,229 km (0.119 R)
• M68: 43,081,943 km (0.086 R)
• M69: 43,522,209 km (0.115 R)
• M70: 45,745,682 km (0.112 R)
• M71: 46,495,018 km (0.081 R)
• M72: 47,778,269 km (0.113 R)
• M73: 49,686,390 km (0.051 R)
• M74: 49,763,283 km (0.106 R)
• M75: 50,688,546 km (0.085 R)
• M76: 50,843,230 km (0.073 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: 260 - 15,646 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit