🌌 Stone's Star System Generator

Asteroid Belt

Center: 0.62 AU

Composition

Type: Main (Rocky/Icy Mix)

A dense region of planetesimals and debris.

Boundary

Planet 1 - Gas Giant

Semi-Major Axis: 1.24 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 400

Radius: 9.7

Gravity: 4.25 G

Time & Orbit

Eccentricity (e): 0.022

Orbit Range: 1.21 AU - 1.27 AU

Year: 971 Days

Day: 5.2 Hours

Environment

Temp: -180 °C

Axial Tilt: 37.8 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (54)

Outer Limit: 73,141,025 km

• M1: 120,875 km (0.081 R)
• M2: 200,312 km (0.097 R)
• M3: 334,650 km (0.085 R)
• M4: 433,235 km (0.105 R)
• M5: 516,113 km (0.056 R)
• M6: 605,123 km (0.107 R)
• M7: 689,796 km (0.034 R)
• M8: 752,328 km (0.036 R)
• M9: 822,339 km (0.092 R)
• M10: 900,430 km (0.042 R)
• M11: 1,052,720 km (0.084 R)
• M12: 1,163,273 km (0.114 R)
• M13: 1,232,836 km (0.107 R)
• M14: 1,383,032 km (0.076 R)
• M15: 1,457,083 km (0.12 R)
• M16: 1,567,187 km (0.118 R)
• M17: 1,745,209 km (0.104 R)
• M18: 1,847,683 km (0.064 R)
• M19: 1,937,292 km (0.107 R)
• M20: 2,013,139 km (0.074 R)
• M21: 2,230,803 km (0.117 R)
• M22: 2,350,482 km (0.119 R)
• M23: 2,472,554 km (0.114 R)
• M24: 2,621,703 km (0.117 R)
• M25: 2,885,743 km (0.118 R)
• M26: 2,955,306 km (0.112 R)
• M27: 3,096,227 km (0.11 R)
• M28: 3,185,387 km (0.086 R)
• M29: 3,348,000 km (0.087 R)
• M30: 3,412,028 km (0.097 R)
• M31: 3,644,204 km (0.052 R)
• M32: 3,766,874 km (0.086 R)
• M33: 4,114,091 km (0.07 R)
• M34: 4,361,227 km (0.064 R)
• M35: 4,451,434 km (0.108 R)
• M36: 4,777,109 km (0.091 R)
• M37: 5,036,960 km (0.113 R)
• M38: 5,333,613 km (0.059 R)
• M39: 5,646,871 km (0.07 R)
• M40: 5,811,279 km (0.08 R)
• M41: 5,888,621 km (0.076 R)
• M42: 5,999,623 km (0.085 R)
• M43: 6,167,471 km (0.12 R)
• M44: 6,382,294 km (0.078 R)
• M45: 6,634,067 km (0.083 R)
• M46: 6,842,457 km (0.113 R)
• M47: 6,935,806 km (0.079 R)
• M48: 7,206,728 km (0.048 R)
• M49: 7,277,936 km (0.104 R)
• M50: 7,819,481 km (0.088 R)
• M51: 7,953,820 km (0.114 R)
• M52: 8,089,056 km (0.116 R)
• M53: 8,163,107 km (0.049 R)
• M54: 8,436,572 km (0.057 R)

Planet 2 - Gas Giant

Semi-Major Axis: 1.29 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 948.1

Radius: 12.7

Gravity: 5.88 G

Time & Orbit

Eccentricity (e): 0.084

Orbit Range: 1.18 AU - 1.4 AU

Year: 1030 Days

Day: 6.3 Hours

Environment

Temp: -194 °C

Axial Tilt: 5.8 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (55)

Outer Limit: 73,141,025 km

• M1: 195,674 km (0.116 R)
• M2: 307,274 km (0.099 R)
• M3: 513,121 km (0.102 R)
• M4: 603,627 km (0.034 R)
• M5: 803,939 km (0.064 R)
• M6: 948,151 km (0.066 R)
• M7: 1,049,579 km (0.044 R)
• M8: 1,185,862 km (0.062 R)
• M9: 1,288,187 km (0.045 R)
• M10: 1,426,864 km (0.095 R)
• M11: 1,510,789 km (0.081 R)
• M12: 1,710,801 km (0.118 R)
• M13: 1,827,787 km (0.092 R)
• M14: 1,966,165 km (0.107 R)
• M15: 2,372,921 km (0.043 R)
• M16: 2,453,405 km (0.076 R)
• M17: 2,956,353 km (0.095 R)
• M18: 3,054,340 km (0.107 R)
• M19: 3,175,514 km (0.081 R)
• M20: 3,264,674 km (0.101 R)
• M21: 3,653,180 km (0.04 R)
• M22: 3,782,133 km (0.099 R)
• M23: 4,020,592 km (0.116 R)
• M24: 4,375,139 km (0.079 R)
• M25: 4,829,468 km (0.083 R)
• M26: 5,023,197 km (0.104 R)
• M27: 5,232,934 km (0.101 R)
• M28: 5,391,956 km (0.076 R)
• M29: 5,579,701 km (0.094 R)
• M30: 5,715,087 km (0.052 R)
• M31: 5,796,917 km (0.117 R)
• M32: 5,906,573 km (0.03 R)
• M33: 6,003,213 km (0.075 R)
• M34: 6,295,976 km (0.109 R)
• M35: 6,380,499 km (0.038 R)
• M36: 6,953,758 km (0.107 R)
• M37: 7,099,765 km (0.12 R)
• M38: 7,232,010 km (0.09 R)
• M39: 7,409,583 km (0.064 R)
• M40: 7,498,892 km (0.066 R)
• M41: 7,738,847 km (0.102 R)
• M42: 7,874,982 km (0.05 R)
• M43: 8,027,272 km (0.119 R)
• M44: 8,396,480 km (0.072 R)
• M45: 8,645,859 km (0.116 R)
• M46: 9,104,078 km (0.074 R)
• M47: 9,360,189 km (0.069 R)
• M48: 9,700,225 km (0.112 R)
• M49: 10,077,062 km (0.106 R)
• M50: 10,225,912 km (0.071 R)
• M51: 10,475,591 km (0.076 R)
• M52: 10,576,121 km (0.059 R)
• M53: 11,322,464 km (0.079 R)
• M54: 11,494,502 km (0.109 R)
• M55: 11,615,377 km (0.116 R)

Planet 3 - Gas Giant

Semi-Major Axis: 1.79 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 491.2

Radius: 12.7

Gravity: 3.05 G

Time & Orbit

Eccentricity (e): 0.22

Orbit Range: 1.4 AU - 2.18 AU

Year: 1683 Days

Day: 12.6 Hours

Environment

Temp: -187 °C

Axial Tilt: 35.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (61)

Outer Limit: 73,141,025 km

• M1: 160,070 km (0.08 R)
• M2: 306,825 km (0.07 R)
• M3: 450,290 km (0.07 R)
• M4: 585,077 km (0.105 R)
• M5: 708,645 km (0.073 R)
• M6: 813,214 km (0.111 R)
• M7: 946,506 km (0.086 R)
• M8: 1,087,726 km (0.116 R)
• M9: 1,169,556 km (0.092 R)
• M10: 1,253,630 km (0.103 R)
• M11: 1,383,780 km (0.106 R)
• M12: 1,482,365 km (0.109 R)
• M13: 1,705,865 km (0.108 R)
• M14: 1,812,079 km (0.03 R)
• M15: 1,900,791 km (0.075 R)
• M16: 2,062,356 km (0.052 R)
• M17: 2,442,484 km (0.108 R)
• M18: 2,697,250 km (0.096 R)
• M19: 3,101,762 km (0.1 R)
• M20: 3,353,835 km (0.06 R)
• M21: 3,439,255 km (0.055 R)
• M22: 3,587,656 km (0.11 R)
• M23: 3,713,019 km (0.042 R)
• M24: 3,929,487 km (0.062 R)
• M25: 4,136,980 km (0.117 R)
• M26: 4,428,396 km (0.049 R)
• M27: 5,045,487 km (0.092 R)
• M28: 5,172,197 km (0.069 R)
• M29: 5,704,316 km (0.105 R)
• M30: 5,880,692 km (0.057 R)
• M31: 6,014,134 km (0.041 R)
• M32: 6,466,368 km (0.116 R)
• M33: 6,851,882 km (0.099 R)
• M34: 7,244,726 km (0.115 R)
• M35: 7,340,169 km (0.085 R)
• M36: 7,436,061 km (0.066 R)
• M37: 7,774,751 km (0.095 R)
• M38: 8,102,071 km (0.045 R)
• M39: 8,383,913 km (0.05 R)
• M40: 8,467,389 km (0.106 R)
• M41: 8,923,214 km (0.082 R)
• M42: 9,008,485 km (0.053 R)
• M43: 9,214,331 km (0.107 R)
• M44: 9,317,853 km (0.096 R)
• M45: 9,525,944 km (0.039 R)
• M46: 9,753,332 km (0.064 R)
• M47: 9,858,799 km (0.034 R)
• M48: 9,946,912 km (0.08 R)
• M49: 10,177,592 km (0.037 R)
• M50: 10,338,260 km (0.082 R)
• M51: 10,571,932 km (0.076 R)
• M52: 10,698,342 km (0.109 R)
• M53: 10,861,853 km (0.057 R)
• M54: 11,431,072 km (0.053 R)
• M55: 11,523,823 km (0.113 R)
• M56: 11,897,219 km (0.064 R)
• M57: 11,991,317 km (0.112 R)
• M58: 12,388,798 km (0.112 R)
• M59: 12,771,320 km (0.118 R)
• M60: 12,906,108 km (0.106 R)
• M61: 13,022,046 km (0.074 R)

Planet 4 - Gas Giant

Semi-Major Axis: 4.71 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 260.9

Radius: 9.7

Gravity: 2.77 G

Time & Orbit

Eccentricity (e): 0.005

Orbit Range: 4.69 AU - 4.73 AU

Year: 7185 Days

Day: 10.3 Hours

Environment

Temp: -226 °C

Axial Tilt: 1.1 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (71)

Outer Limit: 73,141,025 km

• M1: 123,119 km (0.074 R)
• M2: 368,160 km (0.062 R)
• M3: 549,024 km (0.08 R)
• M4: 702,063 km (0.106 R)
• M5: 820,544 km (0.115 R)
• M6: 920,476 km (0.027 R)
• M7: 1,174,792 km (0.093 R)
• M8: 1,406,519 km (0.063 R)
• M9: 1,637,199 km (0.078 R)
• M10: 2,187,270 km (0.097 R)
• M11: 2,715,501 km (0.072 R)
• M12: 2,810,495 km (0.083 R)
• M13: 2,887,389 km (0.106 R)
• M14: 3,527,518 km (0.094 R)
• M15: 4,544,783 km (0.073 R)
• M16: 4,726,545 km (0.078 R)
• M17: 5,144,372 km (0.09 R)
• M18: 5,622,636 km (0.078 R)
• M19: 6,090,279 km (0.115 R)
• M20: 6,290,890 km (0.076 R)
• M21: 6,468,313 km (0.051 R)
• M22: 7,115,174 km (0.056 R)
• M23: 7,891,437 km (0.099 R)
• M24: 8,000,644 km (0.103 R)
• M25: 8,498,356 km (0.094 R)
• M26: 8,694,479 km (0.073 R)
• M27: 8,920,671 km (0.037 R)
• M28: 9,320,995 km (0.086 R)
• M29: 9,727,302 km (0.07 R)
• M30: 9,932,700 km (0.1 R)
• M31: 10,198,835 km (0.105 R)
• M32: 10,347,685 km (0.083 R)
• M33: 10,828,941 km (0.116 R)
• M34: 10,919,897 km (0.116 R)
• M35: 11,782,029 km (0.1 R)
• M36: 12,032,306 km (0.034 R)
• M37: 12,442,803 km (0.035 R)
• M38: 12,506,382 km (0.06 R)
• M39: 13,375,246 km (0.06 R)
• M40: 13,899,288 km (0.115 R)
• M41: 14,163,777 km (0.07 R)
• M42: 14,866,139 km (0.114 R)
• M43: 15,170,570 km (0.119 R)
• M44: 15,511,354 km (0.049 R)
• M45: 15,992,611 km (0.116 R)
• M46: 16,131,138 km (0.114 R)
• M47: 16,339,528 km (0.112 R)
• M48: 16,829,162 km (0.108 R)
• M49: 17,075,849 km (0.076 R)
• M50: 17,679,925 km (0.08 R)
• M51: 17,822,941 km (0.073 R)
• M52: 18,254,830 km (0.072 R)
• M53: 18,762,864 km (0.107 R)
• M54: 19,238,735 km (0.082 R)
• M55: 19,867,196 km (0.103 R)
• M56: 20,615,185 km (0.112 R)
• M57: 20,954,772 km (0.089 R)
• M58: 22,215,583 km (0.102 R)
• M59: 22,370,118 km (0.108 R)
• M60: 22,524,951 km (0.084 R)
• M61: 22,641,339 km (0.081 R)
• M62: 22,913,756 km (0.05 R)
• M63: 23,187,221 km (0.09 R)
• M64: 24,093,186 km (0.084 R)
• M65: 24,252,059 km (0.1 R)
• M66: 24,411,081 km (0.074 R)
• M67: 24,650,438 km (0.118 R)
• M68: 26,551,827 km (0.086 R)
• M69: 26,962,473 km (0.113 R)
• M70: 27,044,901 km (0.051 R)
• M71: 27,540,968 km (0.099 R)

Planet 5 - Ice Giant

Semi-Major Axis: 7.82 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 814.5

Radius: 3.4

Gravity: 70.46 G

Time & Orbit

Eccentricity (e): 0.064

Orbit Range: 7.32 AU - 8.32 AU

Year: 15372 Days

Day: 19.1 Hours

Environment

Temp: -235 °C

Axial Tilt: 0 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (97)

Outer Limit: 73,141,025 km

• M1: 142,417 km (0.072 R)
• M2: 309,518 km (0.115 R)
• M3: 523,293 km (0.066 R)
• M4: 645,066 km (0.055 R)
• M5: 986,448 km (0.101 R)
• M6: 1,571,825 km (0.062 R)
• M7: 1,687,913 km (0.111 R)
• M8: 1,897,799 km (0.099 R)
• M9: 1,928,466 km (0.04 R)
• M10: 2,052,782 km (0.104 R)
• M11: 2,211,954 km (0.036 R)
• M12: 2,375,016 km (0.11 R)
• M13: 2,575,926 km (0.109 R)
• M14: 2,747,365 km (0.113 R)
• M15: 3,283,972 km (0.073 R)
• M16: 3,395,124 km (0.059 R)
• M17: 3,969,131 km (0.079 R)
• M18: 4,167,049 km (0.082 R)
• M19: 4,655,336 km (0.052 R)
• M20: 5,204,211 km (0.119 R)
• M21: 6,224,618 km (0.108 R)
• M22: 7,064,909 km (0.116 R)
• M23: 8,440,910 km (0.045 R)
• M24: 9,003,548 km (0.06 R)
• M25: 9,107,070 km (0.059 R)
• M26: 9,472,836 km (0.114 R)
• M27: 9,525,495 km (0.089 R)
• M28: 10,110,871 km (0.091 R)
• M29: 10,543,808 km (0.101 R)
• M30: 10,927,676 km (0.095 R)
• M31: 11,260,381 km (0.112 R)
• M32: 11,822,121 km (0.08 R)
• M33: 12,163,504 km (0.073 R)
• M34: 12,450,582 km (0.119 R)
• M35: 13,858,896 km (0.115 R)
• M36: 14,038,414 km (0.108 R)
• M37: 14,339,405 km (0.062 R)
• M38: 16,631,842 km (0.047 R)
• M39: 16,695,422 km (0.103 R)
• M40: 18,113,161 km (0.118 R)
• M41: 18,375,106 km (0.082 R)
• M42: 18,638,249 km (0.1 R)
• M43: 18,704,222 km (0.045 R)
• M44: 19,435,157 km (0.106 R)
• M45: 21,337,294 km (0.077 R)
• M46: 21,961,267 km (0.101 R)
• M47: 22,030,979 km (0.065 R)
• M48: 22,591,223 km (0.104 R)
• M49: 22,802,455 km (0.092 R)
• M50: 22,873,066 km (0.107 R)
• M51: 23,298,073 km (0.099 R)
• M52: 24,299,781 km (0.067 R)
• M53: 25,023,834 km (0.072 R)
• M54: 25,681,466 km (0.12 R)
• M55: 26,049,328 km (0.108 R)
• M56: 27,538,126 km (0.099 R)
• M57: 27,990,061 km (0.075 R)
• M58: 28,065,608 km (0.078 R)
• M59: 28,977,706 km (0.058 R)
• M60: 30,441,671 km (0.11 R)
• M61: 30,519,462 km (0.047 R)
• M62: 30,830,924 km (0.081 R)
• M63: 31,221,824 km (0.052 R)
• M64: 31,535,680 km (0.046 R)
• M65: 33,681,661 km (0.084 R)
• M66: 34,084,080 km (0.103 R)
• M67: 35,546,399 km (0.11 R)
• M68: 35,792,188 km (0.07 R)
• M69: 36,202,834 km (0.076 R)
• M70: 36,450,120 km (0.062 R)
• M71: 38,447,850 km (0.088 R)
• M72: 41,166,192 km (0.064 R)
• M73: 42,374,794 km (0.081 R)
• M74: 45,624,658 km (0.109 R)
• M75: 45,980,850 km (0.106 R)
• M76: 47,144,572 km (0.096 R)
• M77: 47,594,712 km (0.069 R)
• M78: 47,684,920 km (0.051 R)
• M79: 47,865,484 km (0.105 R)
• M80: 48,317,868 km (0.117 R)
• M81: 49,044,764 km (0.097 R)
• M82: 50,601,330 km (0.065 R)
• M83: 51,246,845 km (0.081 R)
• M84: 51,802,451 km (0.116 R)
• M85: 53,012,997 km (0.107 R)
• M86: 55,272,224 km (0.057 R)
• M87: 56,700,136 km (0.056 R)
• M88: 56,987,214 km (0.114 R)
• M89: 59,981,416 km (0.108 R)
• M90: 61,154,114 km (0.116 R)
• M91: 62,137,121 km (0.031 R)
• M92: 62,235,706 km (0.063 R)
• M93: 65,117,410 km (0.074 R)
• M94: 65,518,183 km (0.119 R)
• M95: 65,618,563 km (0.111 R)
• M96: 66,221,741 km (0.1 R)
• M97: 66,322,421 km (0.058 R)

Planet 6 - Ice Giant

Semi-Major Axis: 7.94 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 984

Radius: 4.3

Gravity: 53.22 G

Time & Orbit

Eccentricity (e): 0.136

Orbit Range: 6.86 AU - 9.02 AU

Year: 15727 Days

Day: 22.6 Hours

Environment

Temp: -230 °C

Axial Tilt: 47 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (96)

Outer Limit: 73,141,025 km

• M1: 187,745 km (0.091 R)
• M2: 244,892 km (0.108 R)
• M3: 325,226 km (0.079 R)
• M4: 552,764 km (0.064 R)
• M5: 705,204 km (0.11 R)
• M6: 774,618 km (0.059 R)
• M7: 822,040 km (0.039 R)
• M8: 1,127,669 km (0.119 R)
• M9: 1,645,577 km (0.094 R)
• M10: 2,026,902 km (0.1 R)
• M11: 2,093,024 km (0.087 R)
• M12: 2,261,471 km (0.097 R)
• M13: 2,611,530 km (0.1 R)
• M14: 2,647,583 km (0.085 R)
• M15: 3,361,315 km (0.083 R)
• M16: 3,719,153 km (0.045 R)
• M17: 3,841,075 km (0.073 R)
• M18: 4,556,751 km (0.114 R)
• M19: 5,312,520 km (0.113 R)
• M20: 5,775,076 km (0.115 R)
• M21: 5,822,050 km (0.098 R)
• M22: 6,058,863 km (0.047 R)
• M23: 6,395,459 km (0.032 R)
• M24: 6,837,221 km (0.119 R)
• M25: 6,887,037 km (0.064 R)
• M26: 8,115,385 km (0.09 R)
• M27: 9,025,539 km (0.119 R)
• M28: 14,224,813 km (0.115 R)
• M29: 14,607,185 km (0.092 R)
• M30: 15,057,624 km (0.068 R)
• M31: 16,038,089 km (0.115 R)
• M32: 16,636,330 km (0.12 R)
• M33: 16,770,221 km (0.104 R)
• M34: 18,266,648 km (0.068 R)
• M35: 18,404,876 km (0.109 R)
• M36: 19,170,818 km (0.104 R)
• M37: 19,311,290 km (0.08 R)
• M38: 20,375,080 km (0.098 R)
• M39: 21,167,201 km (0.103 R)
• M40: 21,822,889 km (0.093 R)
• M41: 21,969,494 km (0.079 R)
• M42: 22,633,111 km (0.073 R)
• M43: 22,707,311 km (0.089 R)
• M44: 23,378,258 km (0.106 R)
• M45: 24,283,026 km (0.057 R)
• M46: 25,122,569 km (0.07 R)
• M47: 26,126,670 km (0.096 R)
• M48: 27,538,724 km (0.098 R)
• M49: 27,776,435 km (0.064 R)
• M50: 28,253,951 km (0.108 R)
• M51: 32,003,921 km (0.07 R)
• M52: 32,087,247 km (0.11 R)
• M53: 32,170,424 km (0.108 R)
• M54: 32,671,876 km (0.113 R)
• M55: 32,755,651 km (0.11 R)
• M56: 33,428,841 km (0.12 R)
• M57: 34,021,548 km (0.12 R)
• M58: 35,820,313 km (0.088 R)
• M59: 37,036,693 km (0.106 R)
• M60: 38,266,387 km (0.093 R)
• M61: 38,354,800 km (0.067 R)
• M62: 38,708,898 km (0.046 R)
• M63: 40,315,729 km (0.112 R)
• M64: 41,489,623 km (0.107 R)
• M65: 43,225,557 km (0.085 R)
• M66: 44,426,828 km (0.096 R)
• M67: 46,296,352 km (0.063 R)
• M68: 48,000,721 km (0.098 R)
• M69: 48,477,788 km (0.118 R)
• M70: 49,052,394 km (0.096 R)
• M71: 49,629,243 km (0.076 R)
• M72: 49,822,075 km (0.117 R)
• M73: 50,401,767 km (0.079 R)
• M74: 52,154,605 km (0.068 R)
• M75: 53,630,537 km (0.11 R)
• M76: 54,423,257 km (0.07 R)
• M77: 56,824,751 km (0.107 R)
• M78: 58,750,225 km (0.117 R)
• M79: 58,954,127 km (0.093 R)
• M80: 59,772,278 km (0.067 R)
• M81: 60,080,001 km (0.12 R)
• M82: 60,696,942 km (0.117 R)
• M83: 61,523,022 km (0.093 R)
• M84: 61,937,408 km (0.107 R)
• M85: 62,456,662 km (0.049 R)
• M86: 62,977,412 km (0.086 R)
• M87: 63,708,946 km (0.054 R)
• M88: 63,813,665 km (0.071 R)
• M89: 63,918,383 km (0.082 R)
• M90: 65,497,089 km (0.063 R)
• M91: 66,238,048 km (0.107 R)
• M92: 67,515,015 km (0.07 R)
• M93: 68,049,379 km (0.101 R)
• M94: 69,660,996 km (0.062 R)
• M95: 70,959,356 km (0.119 R)
• M96: 72,375,001 km (0.065 R)

Kuiper Belt

Range: 30 - 53 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 449 - 17,465 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit