🌌 Stone's Star System Generator

Planet 1 - Terrestrial

Semi-Major Axis: 0.72 AU

Status: Inner (Hot)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 4.85

Radius: 1.88

Gravity: 1.37 G

Time & Orbit

Eccentricity (e): 0.125

Orbit Range: 0.63 AU - 0.81 AU

Year: 231 Days

Day: 35.3 Hours

Environment

Temp: 119 °C

Axial Tilt: 16.7 °

Atmosphere: Dense CO₂

Biome: Volcanic/Barren

Planet 2 - Terrestrial

Semi-Major Axis: 3.33 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 4.55

Radius: 1.83

Gravity: 1.36 G

Time & Orbit

Eccentricity (e): 0.168

Orbit Range: 2.77 AU - 3.89 AU

Year: 2302 Days

Day: 43.3 Hours

Environment

Temp: -128 °C

Axial Tilt: 38.9 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Satellites (1)

Outer Limit: 48,251,622 km

• M1: 361,877 km (0.084 R)

Planet 3 - Gas Giant

Semi-Major Axis: 4.68 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 660.5

Radius: 14

Gravity: 3.37 G

Time & Orbit

Eccentricity (e): 0.069

Orbit Range: 4.36 AU - 5 AU

Year: 3835 Days

Day: 6.6 Hours

Environment

Temp: -146 °C

Axial Tilt: 9.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (76)

Outer Limit: 48,251,622 km

• M1: 219,759 km (0.115 R)
• M2: 350,807 km (0.078 R)
• M3: 494,271 km (0.119 R)
• M4: 800,049 km (0.028 R)
• M5: 1,116,898 km (0.117 R)
• M6: 1,488,200 km (0.114 R)
• M7: 1,674,150 km (0.11 R)
• M8: 2,038,121 km (0.091 R)
• M9: 2,377,409 km (0.047 R)
• M10: 2,562,612 km (0.078 R)
• M11: 2,665,684 km (0.114 R)
• M12: 2,770,253 km (0.114 R)
• M13: 2,876,169 km (0.099 R)
• M14: 3,037,734 km (0.062 R)
• M15: 3,165,641 km (0.117 R)
• M16: 3,891,041 km (0.038 R)
• M17: 4,030,167 km (0.078 R)
• M18: 4,334,299 km (0.086 R)
• M19: 4,624,968 km (0.063 R)
• M20: 4,965,004 km (0.065 R)
• M21: 5,313,417 km (0.044 R)
• M22: 5,535,271 km (0.064 R)
• M23: 5,669,759 km (0.055 R)
• M24: 6,080,256 km (0.107 R)
• M25: 6,172,707 km (0.09 R)
• M26: 6,289,094 km (0.115 R)
• M27: 6,382,593 km (0.12 R)
• M28: 6,595,022 km (0.073 R)
• M29: 6,881,652 km (0.044 R)
• M30: 7,741,540 km (0.042 R)
• M31: 8,273,809 km (0.049 R)
• M32: 8,505,686 km (0.098 R)
• M33: 8,635,387 km (0.077 R)
• M34: 8,818,046 km (0.074 R)
• M35: 9,615,702 km (0.067 R)
• M36: 9,968,454 km (0.097 R)
• M37: 10,631,173 km (0.101 R)
• M38: 10,742,922 km (0.118 R)
• M39: 11,024,316 km (0.116 R)
• M40: 11,565,561 km (0.113 R)
• M41: 11,738,347 km (0.085 R)
• M42: 11,853,986 km (0.103 R)
• M43: 12,203,147 km (0.059 R)
• M44: 12,437,866 km (0.119 R)
• M45: 12,674,081 km (0.073 R)
• M46: 12,792,712 km (0.098 R)
• M47: 13,452,140 km (0.115 R)
• M48: 13,664,120 km (0.084 R)
• M49: 13,969,150 km (0.074 R)
• M50: 14,091,820 km (0.109 R)
• M51: 14,214,790 km (0.084 R)
• M52: 14,399,992 km (0.113 R)
• M53: 14,710,258 km (0.12 R)
• M54: 14,866,288 km (0.088 R)
• M55: 15,022,917 km (0.113 R)
• M56: 15,400,951 km (0.094 R)
• M57: 16,070,102 km (0.091 R)
• M58: 17,042,489 km (0.055 R)
• M59: 17,403,767 km (0.081 R)
• M60: 17,502,801 km (0.102 R)
• M61: 17,635,046 km (0.105 R)
• M62: 17,800,950 km (0.065 R)
• M63: 18,234,484 km (0.12 R)
• M64: 19,521,774 km (0.035 R)
• M65: 19,830,993 km (0.12 R)
• M66: 20,141,857 km (0.106 R)
• M67: 20,733,367 km (0.11 R)
• M68: 20,908,397 km (0.116 R)
• M69: 21,119,180 km (0.115 R)
• M70: 22,004,800 km (0.076 R)
• M71: 22,758,174 km (0.044 R)
• M72: 23,265,162 km (0.066 R)
• M73: 23,374,219 km (0.086 R)
• M74: 23,812,391 km (0.057 R)
• M75: 24,734,063 km (0.12 R)
• M76: 24,956,964 km (0.073 R)

Planet 4 - Gas Giant

Semi-Major Axis: 7.07 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 898.2

Radius: 11.7

Gravity: 6.56 G

Time & Orbit

Eccentricity (e): 0.086

Orbit Range: 6.46 AU - 7.68 AU

Year: 7120 Days

Day: 14.5 Hours

Environment

Temp: -163 °C

Axial Tilt: 67.3 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (85)

Outer Limit: 48,251,622 km

• M1: 152,291 km (0.081 R)
• M2: 229,932 km (0.055 R)
• M3: 406,906 km (0.102 R)
• M4: 530,324 km (0.054 R)
• M5: 683,213 km (0.109 R)
• M6: 804,687 km (0.09 R)
• M7: 967,749 km (0.113 R)
• M8: 1,215,184 km (0.089 R)
• M9: 2,447,272 km (0.114 R)
• M10: 3,145,146 km (0.111 R)
• M11: 3,249,715 km (0.09 R)
• M12: 3,408,887 km (0.099 R)
• M13: 4,100,029 km (0.065 R)
• M14: 4,243,493 km (0.104 R)
• M15: 4,864,175 km (0.047 R)
• M16: 5,356,352 km (0.079 R)
• M17: 5,481,864 km (0.102 R)
• M18: 5,608,424 km (0.12 R)
• M19: 5,864,536 km (0.102 R)
• M20: 6,355,067 km (0.071 R)
• M21: 6,824,804 km (0.085 R)
• M22: 6,961,088 km (0.08 R)
• M23: 7,375,474 km (0.068 R)
• M24: 7,585,809 km (0.038 R)
• M25: 7,904,901 km (0.069 R)
• M26: 8,048,066 km (0.092 R)
• M27: 8,156,076 km (0.102 R)
• M28: 8,519,599 km (0.039 R)
• M29: 8,925,757 km (0.095 R)
• M30: 9,262,651 km (0.119 R)
• M31: 9,338,049 km (0.109 R)
• M32: 9,565,737 km (0.064 R)
• M33: 9,642,032 km (0.068 R)
• M34: 9,910,560 km (0.115 R)
• M35: 10,220,527 km (0.11 R)
• M36: 10,415,901 km (0.06 R)
• M37: 10,929,770 km (0.098 R)
• M38: 11,451,867 km (0.078 R)
• M39: 11,941,052 km (0.102 R)
• M40: 12,229,476 km (0.095 R)
• M41: 13,066,626 km (0.05 R)
• M42: 13,363,877 km (0.111 R)
• M43: 14,008,644 km (0.093 R)
• M44: 14,225,860 km (0.098 R)
• M45: 14,444,123 km (0.106 R)
• M46: 15,507,315 km (0.103 R)
• M47: 15,957,904 km (0.084 R)
• M48: 16,184,694 km (0.117 R)
• M49: 17,615,000 km (0.108 R)
• M50: 18,085,036 km (0.114 R)
• M51: 18,369,123 km (0.084 R)
• M52: 19,037,526 km (0.063 R)
• M53: 19,519,829 km (0.046 R)
• M54: 19,665,388 km (0.111 R)
• M55: 20,152,928 km (0.116 R)
• M56: 21,689,597 km (0.057 R)
• M57: 22,345,284 km (0.073 R)
• M58: 22,701,028 km (0.087 R)
• M59: 23,109,879 km (0.093 R)
• M60: 25,032,361 km (0.05 R)
• M61: 25,719,913 km (0.107 R)
• M62: 25,826,277 km (0.113 R)
• M63: 27,330,334 km (0.084 R)
• M64: 27,929,025 km (0.096 R)
• M65: 28,697,210 km (0.075 R)
• M66: 29,139,272 km (0.077 R)
• M67: 29,416,626 km (0.099 R)
• M68: 30,930,108 km (0.075 R)
• M69: 31,496,934 km (0.084 R)
• M70: 31,724,772 km (0.106 R)
• M71: 31,838,765 km (0.106 R)
• M72: 32,987,078 km (0.049 R)
• M73: 33,392,040 km (0.111 R)
• M74: 34,265,691 km (0.112 R)
• M75: 34,441,319 km (0.05 R)
• M76: 35,619,851 km (0.07 R)
• M77: 36,871,387 km (0.083 R)
• M78: 36,991,365 km (0.094 R)
• M79: 37,111,492 km (0.083 R)
• M80: 37,713,922 km (0.081 R)
• M81: 38,258,758 km (0.087 R)
• M82: 38,745,250 km (0.057 R)
• M83: 39,050,430 km (0.07 R)
• M84: 39,847,487 km (0.089 R)
• M85: 41,208,678 km (0.093 R)

Planet 5 - Ice Giant

Semi-Major Axis: 16.43 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 725.8

Radius: 6.7

Gravity: 16.17 G

Time & Orbit

Eccentricity (e): 0.218

Orbit Range: 12.85 AU - 20.01 AU

Year: 25223 Days

Day: 20.7 Hours

Environment

Temp: -199 °C

Axial Tilt: 45.8 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (95)

Outer Limit: 48,251,622 km

• M1: 398,828 km (0.1 R)
• M2: 577,149 km (0.116 R)
• M3: 1,218,475 km (0.055 R)
• M4: 1,758,822 km (0.086 R)
• M5: 1,978,731 km (0.117 R)
• M6: 2,246,511 km (0.11 R)
• M7: 2,774,143 km (0.087 R)
• M8: 3,249,715 km (0.092 R)
• M9: 3,294,145 km (0.045 R)
• M10: 3,383,754 km (0.109 R)
• M11: 5,338,849 km (0.071 R)
• M12: 5,711,048 km (0.052 R)
• M13: 6,592,778 km (0.061 R)
• M14: 6,706,024 km (0.103 R)
• M15: 6,819,868 km (0.108 R)
• M16: 7,165,289 km (0.089 R)
• M17: 7,457,603 km (0.098 R)
• M18: 7,753,658 km (0.113 R)
• M19: 8,296,399 km (0.114 R)
• M20: 12,076,587 km (0.114 R)
• M21: 12,424,253 km (0.085 R)
• M22: 13,343,382 km (0.101 R)
• M23: 14,651,915 km (0.048 R)
• M24: 16,612,993 km (0.089 R)
• M25: 17,077,046 km (0.065 R)
• M26: 17,388,957 km (0.095 R)
• M27: 17,467,197 km (0.081 R)
• M28: 17,939,029 km (0.044 R)
• M29: 18,018,166 km (0.071 R)
• M30: 18,895,557 km (0.053 R)
• M31: 21,107,362 km (0.071 R)
• M32: 21,274,463 km (0.105 R)
• M33: 22,371,165 km (0.093 R)
• M34: 22,541,557 km (0.117 R)
• M35: 22,712,248 km (0.112 R)
• M36: 23,055,126 km (0.076 R)
• M37: 24,356,029 km (0.108 R)
• M38: 24,531,358 km (0.1 R)
• M39: 25,236,562 km (0.082 R)
• M40: 26,127,418 km (0.115 R)
• M41: 26,306,786 km (0.104 R)
• M42: 27,119,252 km (0.079 R)
• M43: 28,399,211 km (0.096 R)
• M44: 28,953,770 km (0.062 R)
• M45: 30,167,757 km (0.113 R)
• M46: 30,638,990 km (0.075 R)
• M47: 31,779,973 km (0.102 R)
• M48: 32,838,079 km (0.119 R)
• M49: 36,280,924 km (0.028 R)
• M50: 37,285,324 km (0.063 R)
• M51: 39,116,402 km (0.108 R)
• M52: 40,768,561 km (0.066 R)
• M53: 41,603,018 km (0.109 R)
• M54: 41,917,473 km (0.101 R)
• M55: 42,232,676 km (0.1 R)
• M56: 42,548,626 km (0.076 R)
• M57: 42,654,093 km (0.108 R)
• M58: 42,971,240 km (0.107 R)
• M59: 43,607,630 km (0.087 R)
• M60: 43,820,507 km (0.1 R)
• M61: 45,535,497 km (0.085 R)
• M62: 46,401,220 km (0.115 R)
• M63: 47,710,052 km (0.12 R)
• M64: 48,148,972 km (0.073 R)
• M65: 48,479,135 km (0.026 R)
• M66: 49,141,554 km (0.086 R)
• M67: 52,385,285 km (0.091 R)
• M68: 53,519,835 km (0.083 R)
• M69: 53,633,679 km (0.085 R)
• M70: 56,507,305 km (0.103 R)
• M71: 56,971,656 km (0.116 R)
• M72: 58,138,220 km (0.052 R)
• M73: 58,841,929 km (0.12 R)
• M74: 60,139,242 km (0.081 R)
• M75: 61,207,819 km (0.118 R)
• M76: 62,522,336 km (0.106 R)
• M77: 62,882,418 km (0.043 R)
• M78: 63,243,248 km (0.079 R)
• M79: 64,935,948 km (0.054 R)
• M80: 67,257,108 km (0.062 R)
• M81: 68,860,797 km (0.054 R)
• M82: 69,108,681 km (0.06 R)
• M83: 69,729,662 km (0.104 R)
• M84: 70,851,945 km (0.101 R)
• M85: 71,227,436 km (0.12 R)
• M86: 73,493,844 km (0.094 R)
• M87: 73,873,822 km (0.078 R)
• M88: 74,000,681 km (0.101 R)
• M89: 74,763,181 km (0.105 R)
• M90: 76,295,812 km (0.116 R)
• M91: 83,980,953 km (0.078 R)
• M92: 86,641,552 km (0.092 R)
• M93: 86,909,033 km (0.072 R)
• M94: 87,176,962 km (0.09 R)
• M95: 90,276,780 km (0.097 R)

Planet 6 - Ice Giant

Semi-Major Axis: 17.11 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 784.6

Radius: 5.3

Gravity: 27.93 G

Time & Orbit

Eccentricity (e): 0.079

Orbit Range: 15.76 AU - 18.46 AU

Year: 26805 Days

Day: 22.7 Hours

Environment

Temp: -202 °C

Axial Tilt: 42.1 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (93)

Outer Limit: 48,251,622 km

• M1: 162,613 km (0.099 R)
• M2: 299,495 km (0.106 R)
• M3: 403,316 km (0.083 R)
• M4: 543,489 km (0.112 R)
• M5: 619,485 km (0.115 R)
• M6: 898,335 km (0.095 R)
• M7: 1,279,511 km (0.084 R)
• M8: 1,381,985 km (0.107 R)
• M9: 1,487,302 km (0.086 R)
• M10: 2,012,690 km (0.062 R)
• M11: 2,295,430 km (0.066 R)
• M12: 2,677,054 km (0.089 R)
• M13: 3,262,879 km (0.056 R)
• M14: 3,356,378 km (0.089 R)
• M15: 5,077,651 km (0.053 R)
• M16: 7,145,841 km (0.088 R)
• M17: 7,949,182 km (0.05 R)
• M18: 8,202,152 km (0.102 R)
• M19: 8,329,609 km (0.097 R)
• M20: 8,521,992 km (0.094 R)
• M21: 8,715,871 km (0.108 R)
• M22: 10,525,407 km (0.116 R)
• M23: 13,709,448 km (0.082 R)
• M24: 14,012,683 km (0.108 R)
• M25: 15,091,134 km (0.109 R)
• M26: 15,719,295 km (0.077 R)
• M27: 19,238,885 km (0.057 R)
• M28: 19,323,557 km (0.118 R)
• M29: 20,005,274 km (0.069 R)
• M30: 20,349,050 km (0.101 R)
• M31: 20,521,686 km (0.118 R)
• M32: 21,217,017 km (0.118 R)
• M33: 21,392,047 km (0.113 R)
• M34: 23,529,651 km (0.097 R)
• M35: 24,623,660 km (0.108 R)
• M36: 26,483,610 km (0.042 R)
• M37: 27,145,282 km (0.068 R)
• M38: 27,240,276 km (0.061 R)
• M39: 27,335,271 km (0.069 R)
• M40: 27,430,415 km (0.068 R)
• M41: 27,621,152 km (0.06 R)
• M42: 27,716,745 km (0.078 R)
• M43: 28,099,866 km (0.101 R)
• M44: 28,292,099 km (0.116 R)
• M45: 29,162,459 km (0.071 R)
• M46: 29,454,624 km (0.107 R)
• M47: 30,238,218 km (0.095 R)
• M48: 32,126,891 km (0.037 R)
• M49: 32,227,271 km (0.071 R)
• M50: 34,053,263 km (0.104 R)
• M51: 36,121,004 km (0.111 R)
• M52: 37,275,601 km (0.113 R)
• M53: 37,486,833 km (0.098 R)
• M54: 38,655,641 km (0.086 R)
• M55: 39,836,417 km (0.081 R)
• M56: 39,944,277 km (0.115 R)
• M57: 41,465,388 km (0.076 R)
• M58: 42,123,170 km (0.1 R)
• M59: 43,893,810 km (0.087 R)
• M60: 46,708,794 km (0.073 R)
• M61: 46,822,638 km (0.087 R)
• M62: 47,278,761 km (0.041 R)
• M63: 47,621,789 km (0.11 R)
• M64: 48,310,538 km (0.031 R)
• M65: 49,118,067 km (0.076 R)
• M66: 49,465,583 km (0.098 R)
• M67: 49,581,521 km (0.063 R)
• M68: 54,056,443 km (0.1 R)
• M69: 55,375,597 km (0.071 R)
• M70: 55,858,050 km (0.115 R)
• M71: 56,462,874 km (0.025 R)
• M72: 57,923,548 km (0.097 R)
• M73: 59,027,131 km (0.093 R)
• M74: 59,643,175 km (0.091 R)
• M75: 61,006,012 km (0.087 R)
• M76: 62,253,957 km (0.098 R)
• M77: 63,006,734 km (0.063 R)
• M78: 63,384,319 km (0.05 R)
• M79: 63,510,280 km (0.106 R)
• M80: 64,774,980 km (0.101 R)
• M81: 66,687,440 km (0.107 R)
• M82: 67,457,569 km (0.09 R)
• M83: 68,101,738 km (0.077 R)
• M84: 69,006,805 km (0.115 R)
• M85: 77,734,046 km (0.071 R)
• M86: 80,173,837 km (0.066 R)
• M87: 82,776,242 km (0.06 R)
• M88: 83,051,801 km (0.084 R)
• M89: 83,327,660 km (0.087 R)
• M90: 83,880,274 km (0.113 R)
• M91: 84,157,030 km (0.053 R)
• M92: 90,038,919 km (0.062 R)
• M93: 94,320,560 km (0.103 R)

Planet 7 - Ice Giant

Semi-Major Axis: 19.23 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 68.5

Radius: 4.5

Gravity: 3.38 G

Time & Orbit

Eccentricity (e): 0.02

Orbit Range: 18.85 AU - 19.61 AU

Year: 31939 Days

Day: 22.8 Hours

Environment

Temp: -195 °C

Axial Tilt: 31.4 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (74)

Outer Limit: 48,251,622 km

• M1: 68,217 km (0.113 R)
• M2: 111,600 km (0.116 R)
• M3: 470,784 km (0.025 R)
• M4: 515,963 km (0.115 R)
• M5: 627,413 km (0.047 R)
• M6: 948,600 km (0.09 R)
• M7: 1,006,494 km (0.099 R)
• M8: 1,085,781 km (0.09 R)
• M9: 1,208,452 km (0.103 R)
• M10: 1,271,432 km (0.113 R)
• M11: 1,444,966 km (0.111 R)
• M12: 1,602,941 km (0.113 R)
• M13: 2,420,045 km (0.045 R)
• M14: 2,662,244 km (0.105 R)
• M15: 2,940,346 km (0.099 R)
• M16: 3,054,190 km (0.117 R)
• M17: 3,140,508 km (0.084 R)
• M18: 4,270,122 km (0.119 R)
• M19: 5,131,357 km (0.083 R)
• M20: 6,262,017 km (0.081 R)
• M21: 6,742,675 km (0.12 R)
• M22: 7,504,876 km (0.081 R)
• M23: 8,495,663 km (0.095 R)
• M24: 9,109,463 km (0.096 R)
• M25: 9,358,992 km (0.095 R)
• M26: 10,207,063 km (0.08 R)
• M27: 10,859,010 km (0.118 R)
• M28: 11,212,211 km (0.099 R)
• M29: 11,704,089 km (0.075 R)
• M30: 13,645,719 km (0.075 R)
• M31: 14,411,212 km (0.105 R)
• M32: 15,092,331 km (0.043 R)
• M33: 16,688,390 km (0.097 R)
• M34: 17,044,583 km (0.08 R)
• M35: 17,352,007 km (0.084 R)
• M36: 18,968,711 km (0.067 R)
• M37: 19,074,626 km (0.113 R)
• M38: 19,768,162 km (0.111 R)
• M39: 20,199,004 km (0.075 R)
• M40: 20,469,925 km (0.046 R)
• M41: 20,905,704 km (0.067 R)
• M42: 23,017,577 km (0.088 R)
• M43: 23,812,540 km (0.099 R)
• M44: 24,558,884 km (0.102 R)
• M45: 25,021,889 km (0.109 R)
• M46: 25,254,514 km (0.075 R)
• M47: 26,369,168 km (0.12 R)
• M48: 26,783,853 km (0.05 R)
• M49: 27,021,714 km (0.119 R)
• M50: 27,619,656 km (0.088 R)
• M51: 28,221,938 km (0.085 R)
• M52: 28,950,330 km (0.092 R)
• M53: 29,378,030 km (0.072 R)
• M54: 30,054,511 km (0.114 R)
• M55: 31,485,265 km (0.034 R)
• M56: 32,493,705 km (0.117 R)
• M57: 32,747,423 km (0.091 R)
• M58: 32,811,002 km (0.058 R)
• M59: 33,768,877 km (0.073 R)
• M60: 34,283,643 km (0.12 R)
• M61: 35,581,704 km (0.079 R)
• M62: 35,974,249 km (0.096 R)
• M63: 37,958,365 km (0.055 R)
• M64: 39,165,919 km (0.105 R)
• M65: 39,910,019 km (0.079 R)
• M66: 40,385,890 km (0.08 R)
• M67: 42,100,880 km (0.116 R)
• M68: 42,446,750 km (0.093 R)
• M69: 44,120,002 km (0.06 R)
• M70: 44,894,022 km (0.076 R)
• M71: 45,672,679 km (0.062 R)
• M72: 45,885,706 km (0.117 R)
• M73: 46,099,182 km (0.077 R)
• M74: 47,099,543 km (0.038 R)

Kuiper Belt

Range: 30 - 60 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 309 - 14,385 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit