🌌 Stone's Star System Generator

Planet 1 - Terrestrial

Semi-Major Axis: 0.58 AU

Status: Inner (Hot)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 1.19

Radius: 1.07

Gravity: 1.04 G

Time & Orbit

Eccentricity (e): 0.086

Orbit Range: 0.53 AU - 0.63 AU

Year: 160 Days

Day: 16.2 Hours

Environment

Temp: 163 °C

Axial Tilt: 11.6 °

Atmosphere: Dense CO₂

Biome: Volcanic/Barren

Satellites (1)

Outer Limit: 68,750,060 km

• M1: 288,574 km (0.075 R)

Planet 2 - Terrestrial

Semi-Major Axis: 0.67 AU

Status: Inner (Hot)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 3.74

Radius: 1.69

Gravity: 1.31 G

Time & Orbit

Eccentricity (e): 0.037

Orbit Range: 0.65 AU - 0.69 AU

Year: 198 Days

Day: 18.2 Hours

Environment

Temp: 182 °C

Axial Tilt: 1 °

Atmosphere: Dense CO₂

Biome: Volcanic/Barren

Planet 3 - Terrestrial

Semi-Major Axis: 1.28 AU

Status: HZ

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 2.15

Radius: 1.36

Gravity: 1.16 G

Time & Orbit

Eccentricity (e): 0.022

Orbit Range: 1.25 AU - 1.31 AU

Year: 524 Days

Day: 15.2 Hours

Environment

Temp: 2 °C

Axial Tilt: 155.1 °

Atmosphere: N₂, O₂

Biome: Oceanic/Continental

Satellites (1)

Outer Limit: 68,750,060 km

• M1: 670,348 km (0.094 R)

Planet 4 - Terrestrial

Semi-Major Axis: 1.7 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 1.2

Radius: 1.08

Gravity: 1.03 G

Time & Orbit

Eccentricity (e): 0.108

Orbit Range: 1.52 AU - 1.88 AU

Year: 802 Days

Day: 22.2 Hours

Environment

Temp: -48 °C

Axial Tilt: 34.1 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Asteroid Belt

Center: 3.51 AU

Composition

Type: Inner (Rocky/Metallic)

A dense region of planetesimals and debris.

Boundary

Planet 5 - Gas Giant

Semi-Major Axis: 5.31 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 325

Radius: 12.9

Gravity: 1.95 G

Time & Orbit

Eccentricity (e): 0.206

Orbit Range: 4.22 AU - 6.4 AU

Year: 4425 Days

Day: 9.9 Hours

Environment

Temp: -145 °C

Axial Tilt: 39.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (67)

Outer Limit: 68,750,060 km

• M1: 221,405 km (0.057 R)
• M2: 366,066 km (0.119 R)
• M3: 477,068 km (0.056 R)
• M4: 638,933 km (0.076 R)
• M5: 761,752 km (0.098 R)
• M6: 862,432 km (0.091 R)
• M7: 957,277 km (0.086 R)
• M8: 1,101,340 km (0.111 R)
• M9: 1,241,214 km (0.061 R)
• M10: 1,475,484 km (0.117 R)
• M11: 1,819,858 km (0.091 R)
• M12: 2,059,065 km (0.112 R)
• M13: 2,521,921 km (0.108 R)
• M14: 2,615,270 km (0.095 R)
• M15: 2,725,823 km (0.111 R)
• M16: 2,821,865 km (0.116 R)
• M17: 3,100,117 km (0.047 R)
• M18: 3,268,115 km (0.118 R)
• M19: 3,353,236 km (0.111 R)
• M20: 3,560,579 km (0.099 R)
• M21: 3,754,607 km (0.117 R)
• M22: 4,097,934 km (0.115 R)
• M23: 4,776,361 km (0.076 R)
• M24: 5,108,917 km (0.042 R)
• M25: 5,984,064 km (0.07 R)
• M26: 6,279,071 km (0.094 R)
• M27: 7,059,673 km (0.089 R)
• M28: 7,237,246 km (0.025 R)
• M29: 8,428,045 km (0.061 R)
• M30: 9,022,098 km (0.107 R)
• M31: 9,580,696 km (0.099 R)
• M32: 10,351,425 km (0.119 R)
• M33: 10,553,531 km (0.105 R)
• M34: 10,680,540 km (0.099 R)
• M35: 10,833,579 km (0.048 R)
• M36: 10,961,634 km (0.106 R)
• M37: 11,167,780 km (0.074 R)
• M38: 11,479,243 km (0.079 R)
• M39: 11,609,992 km (0.112 R)
• M40: 11,767,369 km (0.035 R)
• M41: 11,872,685 km (0.049 R)
• M42: 12,031,409 km (0.107 R)
• M43: 12,297,394 km (0.067 R)
• M44: 12,753,966 km (0.104 R)
• M45: 12,889,353 km (0.032 R)
• M46: 13,435,534 km (0.114 R)
• M47: 13,683,867 km (0.096 R)
• M48: 13,794,719 km (0.063 R)
• M49: 14,101,095 km (0.115 R)
• M50: 14,437,840 km (0.117 R)
• M51: 14,579,060 km (0.064 R)
• M52: 14,891,122 km (0.112 R)
• M53: 15,637,615 km (0.097 R)
• M54: 16,543,580 km (0.114 R)
• M55: 17,047,725 km (0.117 R)
• M56: 17,346,621 km (0.091 R)
• M57: 17,466,599 km (0.091 R)
• M58: 17,677,382 km (0.119 R)
• M59: 17,798,107 km (0.108 R)
• M60: 18,682,231 km (0.12 R)
• M61: 18,866,984 km (0.119 R)
• M62: 18,959,585 km (0.038 R)
• M63: 19,643,098 km (0.091 R)
• M64: 20,113,883 km (0.074 R)
• M65: 20,429,684 km (0.084 R)
• M66: 20,842,873 km (0.094 R)
• M67: 20,938,466 km (0.099 R)

Planet 6 - Gas Giant

Semi-Major Axis: 5.79 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 805.3

Radius: 10.7

Gravity: 7.03 G

Time & Orbit

Eccentricity (e): 0.04

Orbit Range: 5.56 AU - 6.02 AU

Year: 5039 Days

Day: 14.2 Hours

Environment

Temp: -143 °C

Axial Tilt: 7.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (81)

Outer Limit: 68,750,060 km

• M1: 141,071 km (0.118 R)
• M2: 282,590 km (0.118 R)
• M3: 511,326 km (0.082 R)
• M4: 661,671 km (0.08 R)
• M5: 1,172,249 km (0.119 R)
• M6: 1,296,864 km (0.076 R)
• M7: 1,611,019 km (0.119 R)
• M8: 1,949,260 km (0.117 R)
• M9: 2,630,379 km (0.09 R)
• M10: 2,922,245 km (0.053 R)
• M11: 3,860,223 km (0.072 R)
• M12: 4,168,545 km (0.09 R)
• M13: 4,313,505 km (0.115 R)
• M14: 4,484,795 km (0.057 R)
• M15: 4,583,679 km (0.094 R)
• M16: 4,783,691 km (0.109 R)
• M17: 5,192,392 km (0.058 R)
• M18: 5,400,932 km (0.027 R)
• M19: 5,880,543 km (0.089 R)
• M20: 6,152,811 km (0.08 R)
• M21: 6,485,217 km (0.102 R)
• M22: 6,625,390 km (0.052 R)
• M23: 6,851,882 km (0.047 R)
• M24: 6,994,748 km (0.091 R)
• M25: 7,080,916 km (0.111 R)
• M26: 7,225,278 km (0.032 R)
• M27: 7,312,494 km (0.068 R)
• M28: 7,576,085 km (0.052 R)
• M29: 8,022,186 km (0.08 R)
• M30: 8,385,409 km (0.078 R)
• M31: 8,538,298 km (0.102 R)
• M32: 9,285,091 km (0.086 R)
• M33: 9,475,230 km (0.12 R)
• M34: 9,634,552 km (0.078 R)
• M35: 10,085,440 km (0.07 R)
• M36: 10,741,426 km (0.077 R)
• M37: 11,041,220 km (0.048 R)
• M38: 11,546,861 km (0.117 R)
• M39: 11,683,145 km (0.064 R)
• M40: 11,819,728 km (0.098 R)
• M41: 12,337,037 km (0.088 R)
• M42: 12,932,287 km (0.11 R)
• M43: 13,969,300 km (0.112 R)
• M44: 14,078,057 km (0.119 R)
• M45: 14,479,428 km (0.082 R)
• M46: 14,700,085 km (0.09 R)
• M47: 14,995,840 km (0.081 R)
• M48: 15,218,891 km (0.064 R)
• M49: 15,630,883 km (0.102 R)
• M50: 16,503,936 km (0.095 R)
• M51: 16,734,467 km (0.095 R)
• M52: 16,965,895 km (0.033 R)
• M53: 17,237,265 km (0.105 R)
• M54: 17,588,371 km (0.098 R)
• M55: 17,745,150 km (0.088 R)
• M56: 18,099,547 km (0.064 R)
• M57: 18,695,545 km (0.084 R)
• M58: 19,419,150 km (0.082 R)
• M59: 20,193,020 km (0.117 R)
• M60: 20,521,836 km (0.11 R)
• M61: 20,604,414 km (0.073 R)
• M62: 20,852,597 km (0.082 R)
• M63: 21,310,067 km (0.083 R)
• M64: 21,477,168 km (0.037 R)
• M65: 21,855,052 km (0.119 R)
• M66: 23,215,944 km (0.088 R)
• M67: 23,474,150 km (0.029 R)
• M68: 23,646,786 km (0.07 R)
• M69: 24,341,818 km (0.06 R)
• M70: 24,429,183 km (0.105 R)
• M71: 24,560,380 km (0.031 R)
• M72: 25,043,432 km (0.12 R)
• M73: 25,219,957 km (0.112 R)
• M74: 25,929,949 km (0.061 R)
• M75: 29,112,494 km (0.051 R)
• M76: 29,205,244 km (0.098 R)
• M77: 30,372,706 km (0.088 R)
• M78: 30,513,926 km (0.09 R)
• M79: 30,891,362 km (0.076 R)
• M80: 31,650,721 km (0.111 R)
• M81: 31,984,922 km (0.025 R)

Planet 7 - Gas Giant

Semi-Major Axis: 7.33 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 403.6

Radius: 9.4

Gravity: 4.57 G

Time & Orbit

Eccentricity (e): 0.036

Orbit Range: 7.07 AU - 7.59 AU

Year: 7177 Days

Day: 11.6 Hours

Environment

Temp: -152 °C

Axial Tilt: 31.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (84)

Outer Limit: 68,750,060 km

• M1: 403,017 km (0.083 R)
• M2: 519,703 km (0.101 R)
• M3: 648,806 km (0.07 R)
• M4: 816,056 km (0.055 R)
• M5: 926,310 km (0.1 R)
• M6: 1,012,478 km (0.098 R)
• M7: 1,131,857 km (0.053 R)
• M8: 1,208,900 km (0.107 R)
• M9: 1,484,609 km (0.078 R)
• M10: 1,673,701 km (0.098 R)
• M11: 2,229,008 km (0.047 R)
• M12: 2,386,385 km (0.057 R)
• M13: 2,527,157 km (0.093 R)
• M14: 2,966,077 km (0.081 R)
• M15: 3,074,087 km (0.116 R)
• M16: 3,139,611 km (0.091 R)
• M17: 3,294,145 km (0.085 R)
• M18: 4,396,532 km (0.096 R)
• M19: 4,544,933 km (0.049 R)
• M20: 5,025,890 km (0.072 R)
• M21: 5,364,280 km (0.105 R)
• M22: 5,872,315 km (0.062 R)
• M23: 6,367,933 km (0.111 R)
• M24: 6,451,707 km (0.089 R)
• M25: 6,620,753 km (0.062 R)
• M26: 6,963,033 km (0.109 R)
• M27: 7,281,826 km (0.111 R)
• M28: 7,428,282 km (0.109 R)
• M29: 7,546,315 km (0.099 R)
• M30: 7,635,176 km (0.053 R)
• M31: 7,933,773 km (0.115 R)
• M32: 8,604,421 km (0.108 R)
• M33: 8,977,967 km (0.097 R)
• M34: 9,103,629 km (0.101 R)
• M35: 9,261,604 km (0.092 R)
• M36: 9,837,706 km (0.077 R)
• M37: 10,064,945 km (0.081 R)
• M38: 10,458,387 km (0.088 R)
• M39: 11,058,125 km (0.092 R)
• M40: 11,125,594 km (0.11 R)
• M41: 11,260,531 km (0.065 R)
• M42: 11,430,175 km (0.104 R)
• M43: 11,703,341 km (0.045 R)
• M44: 12,465,691 km (0.03 R)
• M45: 12,570,859 km (0.045 R)
• M46: 12,852,851 km (0.07 R)
• M47: 13,101,183 km (0.109 R)
• M48: 13,856,054 km (0.09 R)
• M49: 13,928,759 km (0.117 R)
• M50: 14,330,429 km (0.077 R)
• M51: 14,477,484 km (0.049 R)
• M52: 14,588,036 km (0.055 R)
• M53: 14,735,989 km (0.108 R)
• M54: 15,220,237 km (0.074 R)
• M55: 15,520,779 km (0.036 R)
• M56: 15,899,262 km (0.044 R)
• M57: 16,013,405 km (0.069 R)
• M58: 17,482,606 km (0.117 R)
• M59: 19,318,022 km (0.075 R)
• M60: 20,630,594 km (0.073 R)
• M61: 20,755,209 km (0.076 R)
• M62: 21,213,876 km (0.084 R)
• M63: 21,381,575 km (0.102 R)
• M64: 21,844,879 km (0.086 R)
• M65: 22,184,018 km (0.09 R)
• M66: 22,482,017 km (0.092 R)
• M67: 22,996,185 km (0.025 R)
• M68: 23,168,521 km (0.111 R)
• M69: 24,649,690 km (0.107 R)
• M70: 24,737,803 km (0.102 R)
• M71: 25,135,584 km (0.115 R)
• M72: 25,313,007 km (0.111 R)
• M73: 25,937,279 km (0.1 R)
• M74: 26,116,647 km (0.073 R)
• M75: 27,383,292 km (0.104 R)
• M76: 28,438,705 km (0.094 R)
• M77: 28,948,086 km (0.107 R)
• M78: 29,413,933 km (0.098 R)
• M79: 29,976,122 km (0.061 R)
• M80: 30,589,174 km (0.101 R)
• M81: 31,015,977 km (0.075 R)
• M82: 31,588,189 km (0.119 R)
• M83: 31,731,803 km (0.048 R)
• M84: 32,115,820 km (0.068 R)

Planet 8 - Gas Giant

Semi-Major Axis: 10.77 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 163.2

Radius: 11.9

Gravity: 1.15 G

Time & Orbit

Eccentricity (e): 0.085

Orbit Range: 9.85 AU - 11.69 AU

Year: 12782 Days

Day: 10.2 Hours

Environment

Temp: -169 °C

Axial Tilt: 19.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (65)

Outer Limit: 68,750,060 km

• M1: 149,149 km (0.075 R)
• M2: 254,017 km (0.074 R)
• M3: 356,941 km (0.101 R)
• M4: 1,120,488 km (0.099 R)
• M5: 1,489,396 km (0.112 R)
• M6: 1,706,762 km (0.102 R)
• M7: 2,012,839 km (0.081 R)
• M8: 2,092,126 km (0.043 R)
• M9: 2,213,300 km (0.065 R)
• M10: 2,462,531 km (0.111 R)
• M11: 2,765,167 km (0.11 R)
• M12: 3,335,584 km (0.04 R)
• M13: 3,670,833 km (0.109 R)
• M14: 3,967,186 km (0.075 R)
• M15: 4,143,562 km (0.108 R)
• M16: 4,504,392 km (0.026 R)
• M17: 5,037,409 km (0.053 R)
• M18: 5,422,624 km (0.067 R)
• M19: 5,618,746 km (0.065 R)
• M20: 5,731,992 km (0.064 R)
• M21: 6,192,454 km (0.118 R)
• M22: 6,575,275 km (0.114 R)
• M23: 7,240,986 km (0.056 R)
• M24: 7,333,437 km (0.075 R)
• M25: 7,770,113 km (0.114 R)
• M26: 8,636,135 km (0.105 R)
• M27: 9,297,358 km (0.109 R)
• M28: 9,566,335 km (0.054 R)
• M29: 11,882,858 km (0.045 R)
• M30: 12,432,630 km (0.074 R)
• M31: 12,543,632 km (0.098 R)
• M32: 13,633,153 km (0.085 R)
• M33: 14,713,699 km (0.099 R)
• M34: 15,462,586 km (0.106 R)
• M35: 15,621,758 km (0.114 R)
• M36: 16,102,864 km (0.12 R)
• M37: 17,038,449 km (0.112 R)
• M38: 17,450,741 km (0.103 R)
• M39: 18,622,541 km (0.098 R)
• M40: 19,047,250 km (0.102 R)
• M41: 20,209,924 km (0.086 R)
• M42: 21,439,768 km (0.119 R)
• M43: 21,528,480 km (0.114 R)
• M44: 21,795,512 km (0.074 R)
• M45: 21,884,822 km (0.113 R)
• M46: 22,019,011 km (0.079 R)
• M47: 22,874,861 km (0.091 R)
• M48: 23,421,043 km (0.078 R)
• M49: 24,155,867 km (0.065 R)
• M50: 25,695,529 km (0.095 R)
• M51: 26,548,536 km (0.114 R)
• M52: 26,930,758 km (0.116 R)
• M53: 27,603,949 km (0.074 R)
• M54: 28,088,047 km (0.113 R)
• M55: 28,380,062 km (0.047 R)
• M56: 28,575,138 km (0.037 R)
• M57: 29,015,853 km (0.054 R)
• M58: 29,212,425 km (0.056 R)
• M59: 29,409,595 km (0.108 R)
• M60: 31,353,769 km (0.08 R)
• M61: 32,214,256 km (0.099 R)
• M62: 32,980,047 km (0.113 R)
• M63: 33,442,305 km (0.106 R)
• M64: 34,165,611 km (0.065 R)
• M65: 34,581,343 km (0.101 R)

Asteroid Belt

Center: 11.72 AU

Composition

Type: Outer System (Icy)

A dense region of planetesimals and debris.

Boundary

Planet 9 - Ice Giant

Semi-Major Axis: 12.67 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 759.8

Radius: 5.6

Gravity: 24.23 G

Time & Orbit

Eccentricity (e): 0.028

Orbit Range: 12.32 AU - 13.02 AU

Year: 16310 Days

Day: 22.2 Hours

Environment

Temp: -179 °C

Axial Tilt: 35.3 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (95)

Outer Limit: 68,750,060 km

• M1: 75,846 km (0.085 R)
• M2: 309,219 km (0.117 R)
• M3: 769,382 km (0.105 R)
• M4: 1,207,853 km (0.107 R)
• M5: 1,368,970 km (0.11 R)
• M6: 1,537,118 km (0.094 R)
• M7: 1,741,768 km (0.076 R)
• M8: 2,208,962 km (0.048 R)
• M9: 2,713,257 km (0.045 R)
• M10: 2,748,113 km (0.12 R)
• M11: 2,853,579 km (0.096 R)
• M12: 3,288,909 km (0.09 R)
• M13: 3,744,734 km (0.106 R)
• M14: 3,940,558 km (0.089 R)
• M15: 4,179,914 km (0.071 R)
• M16: 4,383,068 km (0.064 R)
• M17: 5,140,781 km (0.111 R)
• M18: 5,270,931 km (0.109 R)
• M19: 5,446,260 km (0.11 R)
• M20: 5,983,765 km (0.05 R)
• M21: 6,397,852 km (0.118 R)
• M22: 6,773,642 km (0.085 R)
• M23: 7,060,272 km (0.075 R)
• M24: 7,205,082 km (0.111 R)
• M25: 7,448,628 km (0.057 R)
• M26: 7,943,797 km (0.104 R)
• M27: 8,094,292 km (0.091 R)
• M28: 8,296,698 km (0.102 R)
• M29: 8,347,561 km (0.111 R)
• M30: 9,122,478 km (0.069 R)
• M31: 9,227,496 km (0.09 R)
• M32: 9,491,835 km (0.108 R)
• M33: 10,354,716 km (0.111 R)
• M34: 10,962,382 km (0.035 R)
• M35: 11,073,982 km (0.097 R)
• M36: 11,695,262 km (0.118 R)
• M37: 12,618,880 km (0.115 R)
• M38: 12,971,183 km (0.075 R)
• M39: 13,267,386 km (0.073 R)
• M40: 13,625,673 km (0.102 R)
• M41: 13,685,662 km (0.114 R)
• M42: 14,535,228 km (0.047 R)
• M43: 14,842,802 km (0.053 R)
• M44: 16,285,075 km (0.089 R)
• M45: 16,412,532 km (0.109 R)
• M46: 16,540,438 km (0.113 R)
• M47: 16,797,148 km (0.074 R)
• M48: 17,837,003 km (0.049 R)
• M49: 18,897,502 km (0.093 R)
• M50: 20,595,139 km (0.098 R)
• M51: 21,636,938 km (0.095 R)
• M52: 22,128,966 km (0.114 R)
• M53: 23,052,433 km (0.119 R)
• M54: 25,010,370 km (0.064 R)
• M55: 25,897,635 km (0.114 R)
• M56: 27,778,679 km (0.112 R)
• M57: 28,697,210 km (0.044 R)
• M58: 29,237,557 km (0.028 R)
• M59: 29,625,614 km (0.086 R)
• M60: 30,721,120 km (0.088 R)
• M61: 30,957,634 km (0.11 R)
• M62: 31,511,744 km (0.102 R)
• M63: 32,871,290 km (0.047 R)
• M64: 33,274,755 km (0.116 R)
• M65: 33,842,330 km (0.096 R)
• M66: 34,086,473 km (0.098 R)
• M67: 34,576,705 km (0.107 R)
• M68: 35,399,045 km (0.095 R)
• M69: 36,477,496 km (0.11 R)
• M70: 36,811,548 km (0.076 R)
• M71: 37,988,584 km (0.119 R)
• M72: 39,948,915 km (0.051 R)
• M73: 40,379,308 km (0.119 R)
• M74: 42,994,578 km (0.103 R)
• M75: 44,055,825 km (0.077 R)
• M76: 44,500,579 km (0.074 R)
• M77: 47,291,028 km (0.104 R)
• M78: 47,381,984 km (0.102 R)
• M79: 47,837,659 km (0.103 R)
• M80: 48,478,088 km (0.075 R)
• M81: 48,753,348 km (0.067 R)
• M82: 49,489,968 km (0.079 R)
• M83: 49,859,774 km (0.107 R)
• M84: 52,097,309 km (0.064 R)
• M85: 56,573,128 km (0.106 R)
• M86: 58,514,609 km (0.109 R)
• M87: 59,297,454 km (0.073 R)
• M88: 61,071,236 km (0.101 R)
• M89: 61,467,671 km (0.034 R)
• M90: 62,363,014 km (0.088 R)
• M91: 64,166,715 km (0.084 R)
• M92: 65,784,168 km (0.055 R)
• M93: 66,904,057 km (0.092 R)
• M94: 67,927,606 km (0.105 R)
• M95: 68,441,175 km (0.119 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: 290 - 14,369 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit