🌌 Stone's Star System Generator

Planet 1 - Terrestrial

Semi-Major Axis: 1.65 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 3.9

Radius: 1.72

Gravity: 1.32 G

Time & Orbit

Eccentricity (e): 0.137

Orbit Range: 1.42 AU - 1.88 AU

Year: 755 Days

Day: 47.6 Hours

Environment

Temp: -34 °C

Axial Tilt: 41.3 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Satellites (1)

Outer Limit: 53,514,019 km

• M1: 544,686 km (0.087 R)

Planet 2 - Terrestrial

Semi-Major Axis: 1.7 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 1.79

Radius: 1.26

Gravity: 1.13 G

Time & Orbit

Eccentricity (e): 0.123

Orbit Range: 1.49 AU - 1.91 AU

Year: 790 Days

Day: 31.4 Hours

Environment

Temp: -34 °C

Axial Tilt: 24.9 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Planet 3 - Gas Giant

Semi-Major Axis: 6.15 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 880.6

Radius: 8.5

Gravity: 12.19 G

Time & Orbit

Eccentricity (e): 0.158

Orbit Range: 5.18 AU - 7.12 AU

Year: 5436 Days

Day: 5.2 Hours

Environment

Temp: -152 °C

Axial Tilt: 3.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (83)

Outer Limit: 53,514,019 km

• M1: 121,773 km (0.036 R)
• M2: 332,406 km (0.055 R)
• M3: 614,398 km (0.116 R)
• M4: 733,030 km (0.04 R)
• M5: 963,410 km (0.069 R)
• M6: 1,317,060 km (0.047 R)
• M7: 1,580,502 km (0.118 R)
• M8: 1,746,705 km (0.114 R)
• M9: 1,822,401 km (0.036 R)
• M10: 1,977,385 km (0.095 R)
• M11: 2,096,315 km (0.047 R)
• M12: 2,510,252 km (0.105 R)
• M13: 2,704,879 km (0.116 R)
• M14: 3,086,054 km (0.05 R)
• M15: 3,155,019 km (0.087 R)
• M16: 3,271,257 km (0.11 R)
• M17: 3,628,496 km (0.091 R)
• M18: 4,124,264 km (0.096 R)
• M19: 4,225,990 km (0.091 R)
• M20: 5,206,305 km (0.082 R)
• M21: 5,964,318 km (0.09 R)
• M22: 6,488,808 km (0.084 R)
• M23: 6,547,899 km (0.072 R)
• M24: 6,906,934 km (0.062 R)
• M25: 7,027,958 km (0.058 R)
• M26: 7,241,584 km (0.052 R)
• M27: 8,021,887 km (0.081 R)
• M28: 8,697,919 km (0.101 R)
• M29: 8,828,818 km (0.101 R)
• M30: 8,894,491 km (0.079 R)
• M31: 9,325,333 km (0.069 R)
• M32: 10,974,350 km (0.05 R)
• M33: 11,080,415 km (0.094 R)
• M34: 11,651,580 km (0.065 R)
• M35: 11,832,144 km (0.1 R)
• M36: 12,232,468 km (0.119 R)
• M37: 12,452,676 km (0.088 R)
• M38: 12,563,379 km (0.03 R)
• M39: 12,822,781 km (0.084 R)
• M40: 13,384,521 km (0.119 R)
• M41: 13,535,765 km (0.081 R)
• M42: 13,801,750 km (0.045 R)
• M43: 14,570,982 km (0.037 R)
• M44: 15,157,107 km (0.106 R)
• M45: 15,950,574 km (0.073 R)
• M46: 16,473,568 km (0.101 R)
• M47: 17,166,056 km (0.103 R)
• M48: 17,826,381 km (0.109 R)
• M49: 18,411,010 km (0.073 R)
• M50: 18,790,241 km (0.08 R)
• M51: 19,513,397 km (0.098 R)
• M52: 20,202,444 km (0.083 R)
• M53: 20,724,391 km (0.08 R)
• M54: 22,271,981 km (0.072 R)
• M55: 22,585,987 km (0.087 R)
• M56: 22,676,045 km (0.095 R)
• M57: 23,400,099 km (0.111 R)
• M58: 23,856,672 km (0.118 R)
• M59: 24,315,937 km (0.099 R)
• M60: 24,500,541 km (0.114 R)
• M61: 25,150,244 km (0.095 R)
• M62: 25,336,943 km (0.102 R)
• M63: 25,570,914 km (0.112 R)
• M64: 25,664,712 km (0.093 R)
• M65: 26,799,112 km (0.119 R)
• M66: 27,133,164 km (0.073 R)
• M67: 27,998,139 km (0.104 R)
• M68: 28,240,188 km (0.067 R)
• M69: 28,579,925 km (0.025 R)
• M70: 28,726,082 km (0.115 R)
• M71: 28,823,471 km (0.047 R)
• M72: 29,116,682 km (0.119 R)
• M73: 29,263,737 km (0.05 R)
• M74: 29,952,934 km (0.034 R)
• M75: 30,498,069 km (0.09 R)
• M76: 30,747,000 km (0.112 R)
• M77: 31,699,041 km (0.118 R)
• M78: 31,951,113 km (0.075 R)
• M79: 32,254,647 km (0.086 R)
• M80: 32,457,502 km (0.097 R)
• M81: 32,559,079 km (0.107 R)
• M82: 32,711,519 km (0.045 R)
• M83: 34,353,655 km (0.099 R)

Planet 4 - Gas Giant

Semi-Major Axis: 9.5 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 129

Radius: 10.1

Gravity: 1.26 G

Time & Orbit

Eccentricity (e): 0.008

Orbit Range: 9.42 AU - 9.58 AU

Year: 10437 Days

Day: 5.8 Hours

Environment

Temp: -169 °C

Axial Tilt: 8.7 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (77)

Outer Limit: 53,514,019 km

• M1: 132,693 km (0.093 R)
• M2: 211,232 km (0.108 R)
• M3: 279,150 km (0.046 R)
• M4: 403,316 km (0.049 R)
• M5: 518,656 km (0.114 R)
• M6: 635,641 km (0.098 R)
• M7: 847,771 km (0.091 R)
• M8: 1,166,415 km (0.109 R)
• M9: 1,251,985 km (0.051 R)
• M10: 1,537,118 km (0.113 R)
• M11: 1,695,692 km (0.07 R)
• M12: 1,943,725 km (0.108 R)
• M13: 2,098,260 km (0.034 R)
• M14: 2,221,379 km (0.075 R)
• M15: 2,549,148 km (0.12 R)
• M16: 2,737,940 km (0.083 R)
• M17: 3,209,772 km (0.119 R)
• M18: 3,393,329 km (0.088 R)
• M19: 3,559,532 km (0.116 R)
• M20: 3,728,428 km (0.103 R)
• M21: 3,878,325 km (0.108 R)
• M22: 4,452,781 km (0.088 R)
• M23: 4,773,219 km (0.1 R)
• M24: 4,983,255 km (0.06 R)
• M25: 5,364,131 km (0.089 R)
• M26: 5,460,921 km (0.09 R)
• M27: 5,779,265 km (0.032 R)
• M28: 6,230,003 km (0.115 R)
• M29: 6,408,474 km (0.104 R)
• M30: 6,718,291 km (0.094 R)
• M31: 6,901,249 km (0.047 R)
• M32: 7,192,217 km (0.074 R)
• M33: 7,433,219 km (0.084 R)
• M34: 7,541,229 km (0.079 R)
• M35: 7,704,290 km (0.072 R)
• M36: 8,992,178 km (0.081 R)
• M37: 9,223,008 km (0.114 R)
• M38: 9,749,443 km (0.1 R)
• M39: 10,527,202 km (0.112 R)
• M40: 10,770,448 km (0.08 R)
• M41: 11,542,822 km (0.105 R)
• M42: 12,205,241 km (0.047 R)
• M43: 12,460,904 km (0.116 R)
• M44: 12,557,245 km (0.1 R)
• M45: 13,402,473 km (0.062 R)
• M46: 13,765,547 km (0.096 R)
• M47: 13,931,751 km (0.12 R)
• M48: 13,998,322 km (0.058 R)
• M49: 14,065,192 km (0.119 R)
• M50: 14,333,271 km (0.073 R)
• M51: 14,908,475 km (0.069 R)
• M52: 15,525,716 km (0.106 R)
• M53: 15,837,627 km (0.049 R)
• M54: 16,256,501 km (0.063 R)
• M55: 17,427,554 km (0.119 R)
• M56: 18,005,001 km (0.037 R)
• M57: 18,186,763 km (0.094 R)
• M58: 18,625,533 km (0.111 R)
• M59: 19,252,947 km (0.086 R)
• M60: 20,226,081 km (0.057 R)
• M61: 20,415,023 km (0.106 R)
• M62: 21,138,478 km (0.08 R)
• M63: 21,484,199 km (0.085 R)
• M64: 21,638,285 km (0.11 R)
• M65: 22,414,997 km (0.073 R)
• M66: 22,610,521 km (0.116 R)
• M67: 22,924,677 km (0.097 R)
• M68: 23,240,179 km (0.095 R)
• M69: 23,517,533 km (0.098 R)
• M70: 24,195,511 km (0.118 R)
• M71: 24,557,089 km (0.049 R)
• M72: 24,758,597 km (0.034 R)
• M73: 24,879,921 km (0.039 R)
• M74: 25,001,395 km (0.113 R)
• M75: 25,611,455 km (0.108 R)
• M76: 26,432,747 km (0.034 R)
• M77: 27,304,304 km (0.047 R)

Planet 5 - Gas Giant

Semi-Major Axis: 9.9 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 797.4

Radius: 13.2

Gravity: 4.58 G

Time & Orbit

Eccentricity (e): 0.154

Orbit Range: 8.38 AU - 11.42 AU

Year: 11103 Days

Day: 6.5 Hours

Environment

Temp: -181 °C

Axial Tilt: 27.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (84)

Outer Limit: 53,514,019 km

• M1: 165,904 km (0.073 R)
• M2: 748,887 km (0.054 R)
• M3: 1,595,312 km (0.093 R)
• M4: 1,843,195 km (0.057 R)
• M5: 2,749,160 km (0.072 R)
• M6: 3,390,037 km (0.066 R)
• M7: 3,549,359 km (0.085 R)
• M8: 3,842,721 km (0.073 R)
• M9: 4,349,408 km (0.05 R)
• M10: 4,522,942 km (0.051 R)
• M11: 5,240,563 km (0.114 R)
• M12: 5,425,616 km (0.086 R)
• M13: 5,917,045 km (0.099 R)
• M14: 6,032,385 km (0.107 R)
• M15: 6,226,563 km (0.077 R)
• M16: 7,064,311 km (0.086 R)
• M17: 7,269,110 km (0.073 R)
• M18: 8,064,971 km (0.12 R)
• M19: 8,844,675 km (0.086 R)
• M20: 9,021,200 km (0.094 R)
• M21: 9,332,962 km (0.098 R)
• M22: 9,648,315 km (0.119 R)
• M23: 11,325,307 km (0.075 R)
• M24: 11,421,049 km (0.078 R)
• M25: 12,492,769 km (0.085 R)
• M26: 12,691,135 km (0.083 R)
• M27: 13,241,805 km (0.074 R)
• M28: 13,902,878 km (0.112 R)
• M29: 14,108,426 km (0.114 R)
• M30: 14,366,781 km (0.05 R)
• M31: 14,574,722 km (0.096 R)
• M32: 14,731,202 km (0.111 R)
• M33: 14,888,279 km (0.088 R)
• M34: 15,416,061 km (0.107 R)
• M35: 15,735,602 km (0.118 R)
• M36: 17,311,017 km (0.112 R)
• M37: 17,754,574 km (0.086 R)
• M38: 17,921,825 km (0.118 R)
• M39: 18,652,611 km (0.094 R)
• M40: 19,107,238 km (0.093 R)
• M41: 20,027,415 km (0.076 R)
• M42: 20,492,964 km (0.12 R)
• M43: 21,553,463 km (0.099 R)
• M44: 22,150,358 km (0.113 R)
• M45: 22,813,226 km (0.104 R)
• M46: 22,995,137 km (0.026 R)
• M47: 23,177,647 km (0.05 R)
• M48: 23,666,383 km (0.105 R)
• M49: 24,344,061 km (0.084 R)
• M50: 24,654,178 km (0.087 R)
• M51: 26,224,357 km (0.094 R)
• M52: 26,542,253 km (0.064 R)
• M53: 27,182,083 km (0.07 R)
• M54: 28,738,050 km (0.099 R)
• M55: 30,056,755 km (0.094 R)
• M56: 32,071,540 km (0.055 R)
• M57: 32,207,374 km (0.114 R)
• M58: 32,889,541 km (0.118 R)
• M59: 34,825,188 km (0.073 R)
• M60: 35,104,636 km (0.057 R)
• M61: 36,513,549 km (0.098 R)
• M62: 36,797,486 km (0.108 R)
• M63: 37,224,887 km (0.116 R)
• M64: 37,582,127 km (0.117 R)
• M65: 38,012,520 km (0.098 R)
• M66: 38,156,433 km (0.078 R)
• M67: 39,750,398 km (0.06 R)
• M68: 40,628,987 km (0.094 R)
• M69: 41,587,909 km (0.084 R)
• M70: 41,736,160 km (0.08 R)
• M71: 41,884,561 km (0.06 R)
• M72: 43,980,278 km (0.095 R)
• M73: 44,509,555 km (0.081 R)
• M74: 45,117,072 km (0.034 R)
• M75: 45,650,837 km (0.1 R)
• M76: 46,186,697 km (0.082 R)
• M77: 47,496,875 km (0.093 R)
• M78: 47,884,483 km (0.045 R)
• M79: 49,445,537 km (0.077 R)
• M80: 49,602,615 km (0.087 R)
• M81: 50,074,746 km (0.084 R)
• M82: 51,579,551 km (0.107 R)
• M83: 52,537,575 km (0.08 R)
• M84: 53,823,967 km (0.075 R)

Planet 6 - Ice Giant

Semi-Major Axis: 16.04 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 684.3

Radius: 6.9

Gravity: 14.37 G

Time & Orbit

Eccentricity (e): 0.194

Orbit Range: 12.93 AU - 19.15 AU

Year: 22898 Days

Day: 24.6 Hours

Environment

Temp: -181 °C

Axial Tilt: 42 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (95)

Outer Limit: 53,514,019 km

• M1: 145,260 km (0.056 R)
• M2: 338,839 km (0.115 R)
• M3: 827,276 km (0.098 R)
• M4: 1,071,869 km (0.045 R)
• M5: 1,463,965 km (0.095 R)
• M6: 1,659,040 km (0.1 R)
• M7: 1,932,356 km (0.118 R)
• M8: 2,754,994 km (0.077 R)
• M9: 4,028,671 km (0.116 R)
• M10: 4,164,954 km (0.099 R)
• M11: 4,395,335 km (0.075 R)
• M12: 4,441,860 km (0.111 R)
• M13: 6,436,448 km (0.09 R)
• M14: 6,542,513 km (0.102 R)
• M15: 7,136,716 km (0.077 R)
• M16: 7,356,924 km (0.076 R)
• M17: 7,747,973 km (0.1 R)
• M18: 9,020,303 km (0.083 R)
• M19: 9,198,773 km (0.111 R)
• M20: 9,318,451 km (0.082 R)
• M21: 10,605,591 km (0.061 R)
• M22: 11,237,942 km (0.087 R)
• M23: 12,012,859 km (0.107 R)
• M24: 12,406,750 km (0.118 R)
• M25: 14,578,163 km (0.111 R)
• M26: 14,787,600 km (0.094 R)
• M27: 15,564,462 km (0.063 R)
• M28: 15,778,536 km (0.081 R)
• M29: 17,898,488 km (0.1 R)
• M30: 18,348,179 km (0.116 R)
• M31: 18,953,601 km (0.106 R)
• M32: 20,417,417 km (0.081 R)
• M33: 20,495,357 km (0.096 R)
• M34: 20,887,154 km (0.093 R)
• M35: 22,077,205 km (0.107 R)
• M36: 23,370,479 km (0.113 R)
• M37: 23,615,819 km (0.102 R)
• M38: 25,272,466 km (0.102 R)
• M39: 25,356,241 km (0.09 R)
• M40: 27,395,409 km (0.101 R)
• M41: 27,567,746 km (0.093 R)
• M42: 28,000,084 km (0.116 R)
• M43: 28,783,977 km (0.066 R)
• M44: 29,840,287 km (0.046 R)
• M45: 30,462,315 km (0.075 R)
• M46: 31,268,349 km (0.116 R)
• M47: 31,809,594 km (0.093 R)
• M48: 32,718,550 km (0.089 R)
• M49: 33,084,467 km (0.115 R)
• M50: 33,359,876 km (0.1 R)
• M51: 34,748,145 km (0.067 R)
• M52: 35,684,029 km (0.05 R)
• M53: 35,778,126 km (0.102 R)
• M54: 37,103,413 km (0.114 R)
• M55: 39,315,517 km (0.082 R)
• M56: 41,076,284 km (0.079 R)
• M57: 41,767,875 km (0.103 R)
• M58: 43,262,956 km (0.107 R)
• M59: 45,998,054 km (0.068 R)
• M60: 46,100,379 km (0.053 R)
• M61: 48,163,633 km (0.098 R)
• M62: 48,684,084 km (0.051 R)
• M63: 52,059,311 km (0.056 R)
• M64: 52,272,787 km (0.072 R)
• M65: 53,774,899 km (0.097 R)
• M66: 56,821,759 km (0.101 R)
• M67: 57,702,442 km (0.042 R)
• M68: 58,587,762 km (0.048 R)
• M69: 59,254,669 km (0.105 R)
• M70: 61,608,592 km (0.103 R)
• M71: 62,399,965 km (0.116 R)
• M72: 62,853,695 km (0.071 R)
• M73: 63,536,310 km (0.089 R)
• M74: 63,878,590 km (0.069 R)
• M75: 64,335,911 km (0.103 R)
• M76: 66,407,093 km (0.059 R)
• M77: 67,683,612 km (0.1 R)
• M78: 70,378,767 km (0.115 R)
• M79: 71,561,488 km (0.095 R)
• M80: 72,512,332 km (0.067 R)
• M81: 72,631,561 km (0.104 R)
• M82: 74,306,609 km (0.111 R)
• M83: 74,546,863 km (0.115 R)
• M84: 75,028,269 km (0.031 R)
• M85: 76,115,247 km (0.113 R)
• M86: 76,721,418 km (0.112 R)
• M87: 76,964,365 km (0.12 R)
• M88: 77,207,461 km (0.116 R)
• M89: 78,671,725 km (0.078 R)
• M90: 79,284,628 km (0.059 R)
• M91: 80,145,264 km (0.097 R)
• M92: 81,380,045 km (0.116 R)
• M93: 81,503,912 km (0.116 R)
• M94: 81,999,829 km (0.085 R)
• M95: 82,870,189 km (0.11 R)

Planet 7 - Ice Giant

Semi-Major Axis: 17.03 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 151.9

Radius: 5.2

Gravity: 5.62 G

Time & Orbit

Eccentricity (e): 0.034

Orbit Range: 16.45 AU - 17.61 AU

Year: 25051 Days

Day: 23.6 Hours

Environment

Temp: -184 °C

Axial Tilt: 33.8 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (83)

Outer Limit: 53,514,019 km

• M1: 183,108 km (0.092 R)
• M2: 315,053 km (0.07 R)
• M3: 524,789 km (0.114 R)
• M4: 991,684 km (0.118 R)
• M5: 1,184,516 km (0.091 R)
• M6: 1,483,861 km (0.081 R)
• M7: 1,531,882 km (0.071 R)
• M8: 1,780,364 km (0.092 R)
• M9: 2,014,635 km (0.084 R)
• M10: 2,541,069 km (0.115 R)
• M11: 2,804,661 km (0.091 R)
• M12: 2,894,569 km (0.087 R)
• M13: 3,232,062 km (0.117 R)
• M14: 3,326,309 km (0.059 R)
• M15: 3,549,808 km (0.047 R)
• M16: 3,745,183 km (0.069 R)
• M17: 4,248,879 km (0.076 R)
• M18: 4,845,325 km (0.097 R)
• M19: 5,282,002 km (0.075 R)
• M20: 5,655,398 km (0.089 R)
• M21: 6,231,499 km (0.114 R)
• M22: 6,906,784 km (0.1 R)
• M23: 7,356,026 km (0.105 R)
• M24: 7,730,620 km (0.055 R)
• M25: 7,772,657 km (0.109 R)
• M26: 8,111,496 km (0.082 R)
• M27: 8,411,888 km (0.103 R)
• M28: 8,891,200 km (0.085 R)
• M29: 9,245,448 km (0.103 R)
• M30: 11,179,449 km (0.111 R)
• M31: 13,994,133 km (0.109 R)
• M32: 14,199,381 km (0.094 R)
• M33: 16,038,238 km (0.08 R)
• M34: 16,360,921 km (0.115 R)
• M35: 17,122,224 km (0.085 R)
• M36: 19,018,527 km (0.072 R)
• M37: 19,189,068 km (0.062 R)
• M38: 19,246,065 km (0.08 R)
• M39: 19,360,059 km (0.038 R)
• M40: 19,646,240 km (0.108 R)
• M41: 19,991,511 km (0.077 R)
• M42: 20,222,640 km (0.112 R)
• M43: 20,454,816 km (0.112 R)
• M44: 21,097,788 km (0.033 R)
• M45: 23,187,221 km (0.112 R)
• M46: 23,491,054 km (0.07 R)
• M47: 23,796,234 km (0.085 R)
• M48: 24,534,051 km (0.037 R)
• M49: 24,719,552 km (0.079 R)
• M50: 26,094,955 km (0.107 R)
• M51: 29,246,085 km (0.063 R)
• M52: 30,899,590 km (0.062 R)
• M53: 32,244,026 km (0.087 R)
• M54: 33,744,792 km (0.09 R)
• M55: 34,572,966 km (0.071 R)
• M56: 36,038,277 km (0.07 R)
• M57: 37,239,248 km (0.12 R)
• M58: 37,381,516 km (0.108 R)
• M59: 37,594,992 km (0.072 R)
• M60: 38,166,606 km (0.08 R)
• M61: 38,597,148 km (0.06 R)
• M62: 39,029,187 km (0.086 R)
• M63: 40,846,951 km (0.082 R)
• M64: 42,098,786 km (0.032 R)
• M65: 42,246,887 km (0.102 R)
• M66: 43,064,440 km (0.078 R)
• M67: 44,413,663 km (0.065 R)
• M68: 44,639,855 km (0.037 R)
• M69: 44,942,043 km (0.041 R)
• M70: 45,017,739 km (0.098 R)
• M71: 45,776,649 km (0.084 R)
• M72: 46,005,085 km (0.119 R)
• M73: 46,846,124 km (0.101 R)
• M74: 46,922,868 km (0.062 R)
• M75: 47,076,356 km (0.107 R)
• M76: 47,230,142 km (0.093 R)
• M77: 48,001,170 km (0.095 R)
• M78: 48,310,837 km (0.04 R)
• M79: 48,621,103 km (0.097 R)
• M80: 49,399,610 km (0.087 R)
• M81: 51,997,976 km (0.066 R)
• M82: 52,077,412 km (0.11 R)
• M83: 53,193,712 km (0.115 R)

Kuiper Belt

Range: 30.8 - 51.8 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 532 - 11,495 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit