🌌 Stone's Star System Generator

Planet 1 - Terrestrial

Semi-Major Axis: 0.86 AU

Status: Inner (Hot)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 0.17

Radius: 0.49

Gravity: 0.71 G

Time & Orbit

Eccentricity (e): 0.117

Orbit Range: 0.76 AU - 0.96 AU

Year: 288 Days

Day: 43.1 Hours

Environment

Temp: 151 °C

Axial Tilt: 12.2 °

Atmosphere: Dense CO₂

Biome: Volcanic/Barren

Planet 2 - Terrestrial

Semi-Major Axis: 3.11 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 0.5

Radius: 0.76

Gravity: 0.87 G

Time & Orbit

Eccentricity (e): 0.092

Orbit Range: 2.82 AU - 3.4 AU

Year: 1983 Days

Day: 13.1 Hours

Environment

Temp: -98 °C

Axial Tilt: 32.8 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Satellites (1)

Outer Limit: 32,555,406 km

• M1: 285,134 km (0.109 R)

Planet 3 - Terrestrial

Semi-Major Axis: 3.78 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 1.44

Radius: 1.16

Gravity: 1.07 G

Time & Orbit

Eccentricity (e): 0.099

Orbit Range: 3.41 AU - 4.15 AU

Year: 2658 Days

Day: 46.2 Hours

Environment

Temp: -111 °C

Axial Tilt: 16.7 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Satellites (1)

Outer Limit: 32,555,406 km

• M1: 2,367,087 km (0.063 R)

Planet 4 - Terrestrial

Semi-Major Axis: 4.4 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 3.95

Radius: 1.73

Gravity: 1.32 G

Time & Orbit

Eccentricity (e): 0.094

Orbit Range: 3.99 AU - 4.81 AU

Year: 3338 Days

Day: 16.3 Hours

Environment

Temp: -122 °C

Axial Tilt: 32.4 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Planet 5 - Gas Giant

Semi-Major Axis: 7.12 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 502.2

Radius: 14.7

Gravity: 2.32 G

Time & Orbit

Eccentricity (e): 0.063

Orbit Range: 6.67 AU - 7.57 AU

Year: 6871 Days

Day: 13.9 Hours

Environment

Temp: -153 °C

Axial Tilt: 1.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (80)

Outer Limit: 32,555,406 km

• M1: 194,627 km (0.102 R)
• M2: 307,274 km (0.101 R)
• M3: 411,394 km (0.109 R)
• M4: 638,334 km (0.067 R)
• M5: 829,520 km (0.089 R)
• M6: 1,209,648 km (0.1 R)
• M7: 1,305,391 km (0.03 R)
• M8: 1,591,572 km (0.119 R)
• M9: 1,751,641 km (0.078 R)
• M10: 1,936,096 km (0.086 R)
• M11: 2,185,924 km (0.107 R)
• M12: 2,675,259 km (0.119 R)
• M13: 3,496,401 km (0.093 R)
• M14: 3,802,778 km (0.115 R)
• M15: 4,069,062 km (0.073 R)
• M16: 4,241,848 km (0.101 R)
• M17: 4,620,181 km (0.07 R)
• M18: 5,356,053 km (0.117 R)
• M19: 5,600,346 km (0.101 R)
• M20: 5,876,354 km (0.11 R)
• M21: 6,241,672 km (0.067 R)
• M22: 6,556,875 km (0.052 R)
• M23: 6,935,956 km (0.094 R)
• M24: 7,624,405 km (0.052 R)
• M25: 8,147,399 km (0.049 R)
• M26: 8,873,697 km (0.086 R)
• M27: 9,293,319 km (0.088 R)
• M28: 9,522,054 km (0.031 R)
• M29: 9,752,584 km (0.107 R)
• M30: 10,252,989 km (0.038 R)
• M31: 10,387,927 km (0.092 R)
• M32: 10,659,447 km (0.11 R)
• M33: 10,967,768 km (0.046 R)
• M34: 11,244,225 km (0.03 R)
• M35: 11,663,398 km (0.089 R)
• M36: 11,839,624 km (0.064 R)
• M37: 12,625,312 km (0.105 R)
• M38: 13,024,439 km (0.096 R)
• M39: 13,686,709 km (0.081 R)
• M40: 14,134,306 km (0.075 R)
• M41: 14,284,652 km (0.077 R)
• M42: 15,312,988 km (0.118 R)
• M43: 15,855,579 km (0.045 R)
• M44: 16,365,109 km (0.113 R)
• M45: 16,483,441 km (0.088 R)
• M46: 17,039,646 km (0.064 R)
• M47: 17,642,376 km (0.105 R)
• M48: 17,926,014 km (0.101 R)
• M49: 18,538,916 km (0.097 R)
• M50: 18,992,946 km (0.086 R)
• M51: 19,117,261 km (0.063 R)
• M52: 19,325,352 km (0.11 R)
• M53: 19,450,416 km (0.084 R)
• M54: 19,701,591 km (0.119 R)
• M55: 20,759,547 km (0.081 R)
• M56: 22,140,634 km (0.092 R)
• M57: 22,271,682 km (0.071 R)
• M58: 22,754,285 km (0.118 R)
• M59: 23,240,328 km (0.111 R)
• M60: 23,998,191 km (0.095 R)
• M61: 24,447,882 km (0.109 R)
• M62: 25,127,506 km (0.089 R)
• M63: 26,459,076 km (0.087 R)
• M64: 26,830,528 km (0.102 R)
• M65: 27,437,745 km (0.09 R)
• M66: 27,860,808 km (0.079 R)
• M67: 28,002,328 km (0.077 R)
• M68: 28,285,965 km (0.11 R)
• M69: 28,618,222 km (0.061 R)
• M70: 28,808,511 km (0.113 R)
• M71: 29,047,269 km (0.095 R)
• M72: 29,142,862 km (0.059 R)
• M73: 29,334,347 km (0.12 R)
• M74: 29,430,389 km (0.119 R)
• M75: 30,638,542 km (0.103 R)
• M76: 30,735,780 km (0.113 R)
• M77: 30,979,625 km (0.106 R)
• M78: 31,518,476 km (0.105 R)
• M79: 31,862,850 km (0.071 R)
• M80: 32,258,088 km (0.095 R)

Planet 6 - Ice Giant

Semi-Major Axis: 13.3 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 404.3

Radius: 7.6

Gravity: 7 G

Time & Orbit

Eccentricity (e): 0.133

Orbit Range: 11.53 AU - 15.07 AU

Year: 17542 Days

Day: 19 Hours

Environment

Temp: -179 °C

Axial Tilt: 38 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (95)

Outer Limit: 32,555,406 km

• M1: 171,290 km (0.038 R)
• M2: 382,821 km (0.107 R)
• M3: 786,885 km (0.115 R)
• M4: 889,060 km (0.118 R)
• M5: 1,084,435 km (0.026 R)
• M6: 1,222,514 km (0.092 R)
• M7: 1,940,883 km (0.108 R)
• M8: 3,087,700 km (0.043 R)
• M9: 3,520,487 km (0.088 R)
• M10: 4,368,856 km (0.119 R)
• M11: 4,778,156 km (0.1 R)
• M12: 5,593,315 km (0.115 R)
• M13: 5,673,200 km (0.077 R)
• M14: 5,753,534 km (0.034 R)
• M15: 6,119,450 km (0.094 R)
• M16: 6,243,018 km (0.098 R)
• M17: 7,261,929 km (0.12 R)
• M18: 7,480,642 km (0.034 R)
• M19: 7,568,755 km (0.091 R)
• M20: 7,790,459 km (0.109 R)
• M21: 8,059,436 km (0.063 R)
• M22: 8,422,809 km (0.025 R)
• M23: 8,791,568 km (0.089 R)
• M24: 9,449,649 km (0.081 R)
• M25: 10,269,744 km (0.098 R)
• M26: 10,515,384 km (0.03 R)
• M27: 12,029,165 km (0.102 R)
• M28: 12,392,089 km (0.118 R)
• M29: 12,864,070 km (0.102 R)
• M30: 13,502,405 km (0.082 R)
• M31: 13,771,531 km (0.117 R)
• M32: 14,976,243 km (0.112 R)
• M33: 15,310,594 km (0.107 R)
• M34: 15,591,240 km (0.117 R)
• M35: 15,760,285 km (0.117 R)
• M36: 16,043,624 km (0.081 R)
• M37: 16,214,464 km (0.105 R)
• M38: 16,557,792 km (0.103 R)
• M39: 17,019,301 km (0.088 R)
• M40: 17,426,656 km (0.112 R)
• M41: 17,602,284 km (0.046 R)
• M42: 18,132,459 km (0.096 R)
• M43: 18,369,871 km (0.098 R)
• M44: 18,429,410 km (0.066 R)
• M45: 18,488,950 km (0.078 R)
• M46: 18,668,019 km (0.094 R)
• M47: 18,907,675 km (0.069 R)
• M48: 18,967,664 km (0.094 R)
• M49: 19,208,666 km (0.067 R)
• M50: 19,389,978 km (0.113 R)
• M51: 21,047,672 km (0.084 R)
• M52: 21,110,055 km (0.103 R)
• M53: 21,988,194 km (0.107 R)
• M54: 22,431,752 km (0.111 R)
• M55: 22,495,331 km (0.072 R)
• M56: 23,456,647 km (0.119 R)
• M57: 24,627,998 km (0.098 R)
• M58: 25,684,907 km (0.068 R)
• M59: 26,018,361 km (0.105 R)
• M60: 27,298,021 km (0.095 R)
• M61: 27,979,888 km (0.11 R)
• M62: 28,943,747 km (0.101 R)
• M63: 29,918,527 km (0.099 R)
• M64: 31,187,416 km (0.095 R)
• M65: 31,685,727 km (0.103 R)
• M66: 32,258,387 km (0.081 R)
• M67: 33,268,622 km (0.103 R)
• M68: 33,923,711 km (0.097 R)
• M69: 33,996,715 km (0.064 R)
• M70: 37,639,123 km (0.08 R)
• M71: 37,941,910 km (0.119 R)
• M72: 39,084,538 km (0.105 R)
• M73: 39,237,726 km (0.082 R)
• M74: 39,775,531 km (0.11 R)
• M75: 40,936,111 km (0.101 R)
• M76: 41,794,354 km (0.08 R)
• M77: 43,528,343 km (0.114 R)
• M78: 44,005,410 km (0.036 R)
• M79: 46,497,412 km (0.075 R)
• M80: 46,984,951 km (0.048 R)
• M81: 49,117,319 km (0.118 R)
• M82: 49,696,861 km (0.057 R)
• M83: 49,945,942 km (0.039 R)
• M84: 50,278,648 km (0.118 R)
• M85: 50,695,577 km (0.087 R)
• M86: 51,784,949 km (0.054 R)
• M87: 52,121,693 km (0.115 R)
• M88: 52,374,663 km (0.101 R)
• M89: 53,731,217 km (0.101 R)
• M90: 54,328,262 km (0.058 R)
• M91: 54,755,962 km (0.053 R)
• M92: 55,013,271 km (0.091 R)
• M93: 55,787,440 km (0.113 R)
• M94: 58,306,069 km (0.064 R)
• M95: 58,393,584 km (0.118 R)

Planet 7 - Ice Giant

Semi-Major Axis: 14.32 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 116

Radius: 6.9

Gravity: 2.44 G

Time & Orbit

Eccentricity (e): 0.079

Orbit Range: 13.19 AU - 15.45 AU

Year: 19598 Days

Day: 22.7 Hours

Environment

Temp: -196 °C

Axial Tilt: 31.3 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (81)

Outer Limit: 32,555,406 km

• M1: 211,980 km (0.097 R)
• M2: 334,202 km (0.05 R)
• M3: 442,511 km (0.115 R)
• M4: 508,034 km (0.116 R)
• M5: 853,306 km (0.073 R)
• M6: 1,041,201 km (0.106 R)
• M7: 1,223,561 km (0.106 R)
• M8: 1,376,749 km (0.11 R)
• M9: 1,495,829 km (0.073 R)
• M10: 1,556,715 km (0.093 R)
• M11: 1,618,499 km (0.051 R)
• M12: 2,187,420 km (0.074 R)
• M13: 2,469,412 km (0.06 R)
• M14: 3,654,526 km (0.12 R)
• M15: 3,932,479 km (0.05 R)
• M16: 4,131,295 km (0.043 R)
• M17: 4,362,424 km (0.051 R)
• M18: 4,837,247 km (0.111 R)
• M19: 5,328,527 km (0.11 R)
• M20: 5,580,150 km (0.032 R)
• M21: 5,835,813 km (0.102 R)
• M22: 6,259,175 km (0.066 R)
• M23: 6,827,796 km (0.045 R)
• M24: 7,135,519 km (0.097 R)
• M25: 7,729,124 km (0.087 R)
• M26: 7,871,092 km (0.086 R)
• M27: 7,942,301 km (0.08 R)
• M28: 8,049,712 km (0.057 R)
• M29: 8,338,436 km (0.085 R)
• M30: 8,630,600 km (0.084 R)
• M31: 9,986,256 km (0.111 R)
• M32: 10,218,582 km (0.025 R)
• M33: 10,374,463 km (0.087 R)
• M34: 10,452,702 km (0.049 R)
• M35: 11,165,686 km (0.086 R)
• M36: 12,513,114 km (0.094 R)
• M37: 13,269,630 km (0.081 R)
• M38: 13,354,602 km (0.074 R)
• M39: 13,482,358 km (0.073 R)
• M40: 13,610,564 km (0.045 R)
• M41: 13,696,283 km (0.054 R)
• M42: 13,825,087 km (0.099 R)
• M43: 14,301,108 km (0.094 R)
• M44: 15,851,091 km (0.064 R)
• M45: 16,440,208 km (0.099 R)
• M46: 17,036,505 km (0.092 R)
• M47: 17,267,783 km (0.08 R)
• M48: 17,360,534 km (0.085 R)
• M49: 17,733,332 km (0.118 R)
• M50: 18,203,219 km (0.063 R)
• M51: 18,534,428 km (0.104 R)
• M52: 20,563,424 km (0.065 R)
• M53: 20,908,546 km (0.112 R)
• M54: 20,957,914 km (0.119 R)
• M55: 21,056,947 km (0.102 R)
• M56: 21,654,142 km (0.092 R)
• M57: 22,257,022 km (0.114 R)
• M58: 23,222,676 km (0.107 R)
• M59: 24,046,511 km (0.109 R)
• M60: 25,300,141 km (0.069 R)
• M61: 25,881,778 km (0.098 R)
• M62: 26,254,277 km (0.026 R)
• M63: 26,521,309 km (0.117 R)
• M64: 26,574,865 km (0.036 R)
• M65: 26,735,683 km (0.058 R)
• M66: 28,197,553 km (0.109 R)
• M67: 30,074,857 km (0.102 R)
• M68: 30,803,398 km (0.08 R)
• M69: 32,563,866 km (0.101 R)
• M70: 32,793,349 km (0.105 R)
• M71: 33,427,345 km (0.103 R)
• M72: 34,065,380 km (0.037 R)
• M73: 34,181,767 km (0.113 R)
• M74: 35,117,951 km (0.027 R)
• M75: 35,176,743 km (0.08 R)
• M76: 35,707,366 km (0.091 R)
• M77: 36,657,313 km (0.112 R)
• M78: 37,435,222 km (0.09 R)
• M79: 39,251,041 km (0.111 R)
• M80: 40,231,056 km (0.109 R)
• M81: 41,343,316 km (0.106 R)

Planet 8 - Ice Giant

Semi-Major Axis: 15.08 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 279.4

Radius: 3.9

Gravity: 18.37 G

Time & Orbit

Eccentricity (e): 0.081

Orbit Range: 13.86 AU - 16.3 AU

Year: 21178 Days

Day: 15 Hours

Environment

Temp: -186 °C

Axial Tilt: 34.4 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (93)

Outer Limit: 32,555,406 km

• M1: 53,706 km (0.07 R)
• M2: 116,088 km (0.108 R)
• M3: 156,180 km (0.086 R)
• M4: 322,982 km (0.115 R)
• M5: 482,453 km (0.116 R)
• M6: 703,409 km (0.113 R)
• M7: 1,019,210 km (0.114 R)
• M8: 1,551,629 km (0.074 R)
• M9: 2,156,453 km (0.1 R)
• M10: 2,699,494 km (0.082 R)
• M11: 3,417,414 km (0.1 R)
• M12: 3,974,367 km (0.101 R)
• M13: 4,336,693 km (0.114 R)
• M14: 4,785,187 km (0.098 R)
• M15: 4,823,185 km (0.09 R)
• M16: 5,327,031 km (0.109 R)
• M17: 5,725,709 km (0.073 R)
• M18: 5,806,641 km (0.099 R)
• M19: 6,509,602 km (0.116 R)
• M20: 7,021,825 km (0.082 R)
• M21: 7,458,501 km (0.116 R)
• M22: 8,266,330 km (0.112 R)
• M23: 8,312,106 km (0.114 R)
• M24: 9,148,957 km (0.083 R)
• M25: 9,290,925 km (0.114 R)
• M26: 9,915,048 km (0.078 R)
• M27: 11,152,671 km (0.091 R)
• M28: 11,405,940 km (0.027 R)
• M29: 12,125,356 km (0.094 R)
• M30: 12,753,518 km (0.108 R)
• M31: 14,867,036 km (0.093 R)
• M32: 15,878,468 km (0.05 R)
• M33: 15,992,162 km (0.067 R)
• M34: 17,319,544 km (0.115 R)
• M35: 17,671,697 km (0.077 R)
• M36: 17,730,489 km (0.061 R)
• M37: 19,163,786 km (0.04 R)
• M38: 20,078,278 km (0.04 R)
• M39: 20,510,018 km (0.058 R)
• M40: 20,633,885 km (0.091 R)
• M41: 21,633,797 km (0.096 R)
• M42: 22,394,203 km (0.101 R)
• M43: 22,457,932 km (0.061 R)
• M44: 23,034,332 km (0.099 R)
• M45: 23,163,136 km (0.118 R)
• M46: 23,550,894 km (0.038 R)
• M47: 23,680,595 km (0.08 R)
• M48: 24,005,970 km (0.094 R)
• M49: 24,136,569 km (0.064 R)
• M50: 25,057,045 km (0.118 R)
• M51: 25,455,125 km (0.055 R)
• M52: 27,544,558 km (0.119 R)
• M53: 27,612,775 km (0.046 R)
• M54: 27,749,657 km (0.06 R)
• M55: 27,955,204 km (0.086 R)
• M56: 28,023,870 km (0.063 R)
• M57: 28,161,350 km (0.089 R)
• M58: 28,782,780 km (0.046 R)
• M59: 30,603,087 km (0.071 R)
• M60: 30,673,847 km (0.077 R)
• M61: 31,028,394 km (0.1 R)
• M62: 32,316,132 km (0.105 R)
• M63: 32,388,238 km (0.111 R)
• M64: 33,986,841 km (0.086 R)
• M65: 34,648,213 km (0.091 R)
• M66: 34,869,618 km (0.073 R)
• M67: 37,942,209 km (0.072 R)
• M68: 38,094,200 km (0.085 R)
• M69: 38,551,670 km (0.073 R)
• M70: 39,780,467 km (0.091 R)
• M71: 40,167,028 km (0.119 R)
• M72: 40,322,012 km (0.062 R)
• M73: 40,866,099 km (0.098 R)
• M74: 41,490,820 km (0.113 R)
• M75: 41,804,527 km (0.087 R)
• M76: 42,040,143 km (0.056 R)
• M77: 42,276,209 km (0.116 R)
• M78: 42,749,836 km (0.074 R)
• M79: 44,261,073 km (0.116 R)
• M80: 44,581,512 km (0.116 R)
• M81: 45,547,166 km (0.072 R)
• M82: 47,909,466 km (0.067 R)
• M83: 48,403,139 km (0.082 R)
• M84: 48,567,996 km (0.095 R)
• M85: 48,898,458 km (0.102 R)
• M86: 50,729,236 km (0.119 R)
• M87: 53,176,508 km (0.084 R)
• M88: 54,800,542 km (0.072 R)
• M89: 55,230,786 km (0.032 R)
• M90: 55,403,123 km (0.072 R)
• M91: 55,489,291 km (0.072 R)
• M92: 56,875,315 km (0.095 R)
• M93: 57,136,364 km (0.117 R)

Planet 9 - Ice Giant

Semi-Major Axis: 18.48 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 26

Radius: 7.1

Gravity: 0.52 G

Time & Orbit

Eccentricity (e): 0.15

Orbit Range: 15.71 AU - 21.25 AU

Year: 28730 Days

Day: 17.5 Hours

Environment

Temp: -201 °C

Axial Tilt: 32 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (49)

Outer Limit: 32,555,406 km

• M1: 451,337 km (0.098 R)
• M2: 1,592,619 km (0.11 R)
• M3: 2,304,106 km (0.099 R)
• M4: 2,567,698 km (0.1 R)
• M5: 4,146,703 km (0.103 R)
• M6: 4,442,309 km (0.106 R)
• M7: 4,795,958 km (0.096 R)
• M8: 4,950,343 km (0.045 R)
• M9: 6,076,067 km (0.068 R)
• M10: 6,496,587 km (0.066 R)
• M11: 7,663,600 km (0.042 R)
• M12: 7,814,095 km (0.112 R)
• M13: 8,271,117 km (0.107 R)
• M14: 8,487,435 km (0.105 R)
• M15: 8,831,062 km (0.038 R)
• M16: 8,925,607 km (0.087 R)
• M17: 9,083,882 km (0.09 R)
• M18: 9,628,867 km (0.101 R)
• M19: 10,383,289 km (0.12 R)
• M20: 10,516,282 km (0.087 R)
• M21: 10,616,512 km (0.084 R)
• M22: 10,717,042 km (0.115 R)
• M23: 10,784,361 km (0.114 R)
• M24: 12,087,508 km (0.102 R)
• M25: 12,474,069 km (0.091 R)
• M26: 12,686,498 km (0.111 R)
• M27: 14,133,857 km (0.081 R)
• M28: 15,177,602 km (0.113 R)
• M29: 15,861,713 km (0.12 R)
• M30: 16,362,118 km (0.119 R)
• M31: 16,633,638 km (0.053 R)
• M32: 17,220,510 km (0.109 R)
• M33: 17,338,692 km (0.101 R)
• M34: 18,013,528 km (0.107 R)
• M35: 18,454,842 km (0.032 R)
• M36: 19,882,455 km (0.102 R)
• M37: 20,965,842 km (0.083 R)
• M38: 22,583,295 km (0.105 R)
• M39: 22,755,931 km (0.096 R)
• M40: 22,972,249 km (0.115 R)
• M41: 23,145,783 km (0.058 R)
• M42: 24,064,313 km (0.036 R)
• M43: 24,417,364 km (0.049 R)
• M44: 25,083,823 km (0.077 R)
• M45: 25,217,863 km (0.065 R)
• M46: 26,344,035 km (0.094 R)
• M47: 27,762,971 km (0.047 R)
• M48: 28,645,000 km (0.111 R)
• M49: 30,198,574 km (0.094 R)

Kuiper Belt

Range: 30.3 - 46.3 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 294 - 11,548 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit