🌌 Stone's Star System Generator

Planet 1 - Terrestrial

Semi-Major Axis: 0.51 AU

Status: Inner (Hot)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 3.59

Radius: 1.67

Gravity: 1.29 G

Time & Orbit

Eccentricity (e): 0.008

Orbit Range: 0.51 AU - 0.51 AU

Year: 138 Days

Day: 30.1 Hours

Environment

Temp: 220 °C

Axial Tilt: 38.4 °

Atmosphere: Dense CO₂

Biome: Volcanic/Barren

Planet 2 - Terrestrial

Semi-Major Axis: 0.62 AU

Status: Inner (Hot)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 0.41

Radius: 0.7

Gravity: 0.84 G

Time & Orbit

Eccentricity (e): 0.186

Orbit Range: 0.5 AU - 0.74 AU

Year: 185 Days

Day: 36.4 Hours

Environment

Temp: 188 °C

Axial Tilt: 44.9 °

Atmosphere: Dense CO₂

Biome: Volcanic/Barren

Planet 3 - Terrestrial

Semi-Major Axis: 1.78 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 3.19

Radius: 1.59

Gravity: 1.26 G

Time & Orbit

Eccentricity (e): 0.227

Orbit Range: 1.38 AU - 2.18 AU

Year: 899 Days

Day: 27.3 Hours

Environment

Temp: -64 °C

Axial Tilt: 25.5 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Planet 4 - Gas Giant

Semi-Major Axis: 5.37 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 591.8

Radius: 9.4

Gravity: 6.7 G

Time & Orbit

Eccentricity (e): 0.198

Orbit Range: 4.31 AU - 6.43 AU

Year: 4713 Days

Day: 13.2 Hours

Environment

Temp: -149 °C

Axial Tilt: 25.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (83)

Outer Limit: 63,385,121 km

• M1: 162,463 km (0.081 R)
• M2: 252,820 km (0.064 R)
• M3: 337,194 km (0.095 R)
• M4: 626,815 km (0.088 R)
• M5: 860,188 km (0.039 R)
• M6: 935,735 km (0.1 R)
• M7: 1,040,304 km (0.063 R)
• M8: 1,232,836 km (0.07 R)
• M9: 1,333,665 km (0.085 R)
• M10: 1,392,457 km (0.108 R)
• M11: 1,452,296 km (0.1 R)
• M12: 1,590,076 km (0.119 R)
• M13: 1,732,343 km (0.092 R)
• M14: 1,846,038 km (0.062 R)
• M15: 2,029,594 km (0.117 R)
• M16: 2,115,164 km (0.077 R)
• M17: 2,254,590 km (0.101 R)
• M18: 2,597,917 km (0.06 R)
• M19: 3,133,926 km (0.096 R)
• M20: 3,435,216 km (0.1 R)
• M21: 3,517,046 km (0.066 R)
• M22: 3,578,979 km (0.079 R)
• M23: 3,724,837 km (0.098 R)
• M24: 3,893,883 km (0.069 R)
• M25: 3,979,453 km (0.045 R)
• M26: 4,043,930 km (0.063 R)
• M27: 5,030,677 km (0.088 R)
• M28: 5,124,026 km (0.091 R)
• M29: 5,194,337 km (0.065 R)
• M30: 5,336,006 km (0.108 R)
• M31: 5,720,174 km (0.105 R)
• M32: 6,113,317 km (0.098 R)
• M33: 6,212,949 km (0.096 R)
• M34: 6,288,047 km (0.116 R)
• M35: 7,160,352 km (0.111 R)
• M36: 7,344,657 km (0.075 R)
• M37: 7,934,222 km (0.113 R)
• M38: 8,015,753 km (0.081 R)
• M39: 8,846,769 km (0.109 R)
• M40: 9,675,990 km (0.077 R)
• M41: 9,763,206 km (0.116 R)
• M42: 10,381,045 km (0.076 R)
• M43: 10,559,964 km (0.119 R)
• M44: 10,739,781 km (0.042 R)
• M45: 11,041,819 km (0.103 R)
• M46: 11,133,074 km (0.039 R)
• M47: 11,500,187 km (0.107 R)
• M48: 11,840,223 km (0.041 R)
• M49: 12,246,530 km (0.1 R)
• M50: 12,340,927 km (0.036 R)
• M51: 12,816,498 km (0.049 R)
• M52: 12,880,377 km (0.039 R)
• M53: 13,298,054 km (0.092 R)
• M54: 13,459,919 km (0.078 R)
• M55: 13,785,743 km (0.099 R)
• M56: 13,982,315 km (0.089 R)
• M57: 14,345,389 km (0.071 R)
• M58: 14,878,855 km (0.119 R)
• M59: 14,979,684 km (0.087 R)
• M60: 15,317,176 km (0.115 R)
• M61: 15,418,903 km (0.056 R)
• M62: 16,137,422 km (0.053 R)
• M63: 16,761,993 km (0.104 R)
• M64: 16,972,028 km (0.064 R)
• M65: 17,429,947 km (0.117 R)
• M66: 19,964,733 km (0.071 R)
• M67: 20,261,685 km (0.064 R)
• M68: 20,560,133 km (0.065 R)
• M69: 20,634,932 km (0.095 R)
• M70: 20,897,626 km (0.086 R)
• M71: 21,048,121 km (0.067 R)
• M72: 21,312,610 km (0.049 R)
• M73: 21,388,307 km (0.046 R)
• M74: 21,464,153 km (0.103 R)
• M75: 21,806,582 km (0.1 R)
• M76: 22,573,720 km (0.117 R)
• M77: 22,844,492 km (0.071 R)
• M78: 23,349,834 km (0.099 R)
• M79: 23,701,987 km (0.102 R)
• M80: 25,328,266 km (0.084 R)
• M81: 26,908,319 km (0.042 R)
• M82: 27,359,655 km (0.096 R)
• M83: 27,565,801 km (0.092 R)

Planet 5 - Gas Giant

Semi-Major Axis: 6.2 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 807

Radius: 13.7

Gravity: 4.3 G

Time & Orbit

Eccentricity (e): 0.079

Orbit Range: 5.71 AU - 6.69 AU

Year: 5847 Days

Day: 11.6 Hours

Environment

Temp: -151 °C

Axial Tilt: 14.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (77)

Outer Limit: 63,385,121 km

• M1: 176,226 km (0.082 R)
• M2: 293,212 km (0.081 R)
• M3: 381,624 km (0.069 R)
• M4: 506,688 km (0.053 R)
• M5: 795,113 km (0.116 R)
• M6: 1,089,970 km (0.063 R)
• M7: 1,234,631 km (0.081 R)
• M8: 1,438,084 km (0.072 R)
• M9: 1,708,557 km (0.117 R)
• M10: 1,859,801 km (0.107 R)
• M11: 2,115,463 km (0.04 R)
• M12: 2,467,318 km (0.108 R)
• M13: 2,639,654 km (0.119 R)
• M14: 3,041,923 km (0.12 R)
• M15: 3,368,645 km (0.071 R)
• M16: 4,030,915 km (0.086 R)
• M17: 4,183,654 km (0.038 R)
• M18: 4,364,219 km (0.113 R)
• M19: 5,167,709 km (0.053 R)
• M20: 5,306,236 km (0.056 R)
• M21: 5,672,003 km (0.1 R)
• M22: 5,930,060 km (0.071 R)
• M23: 6,339,210 km (0.108 R)
• M24: 7,433,518 km (0.101 R)
• M25: 7,590,147 km (0.086 R)
• M26: 8,098,930 km (0.08 R)
• M27: 8,195,570 km (0.083 R)
• M28: 8,783,340 km (0.108 R)
• M29: 8,949,094 km (0.11 R)
• M30: 9,149,406 km (0.073 R)
• M31: 9,520,408 km (0.104 R)
• M32: 9,724,909 km (0.116 R)
• M33: 10,277,374 km (0.086 R)
• M34: 11,089,541 km (0.091 R)
• M35: 11,959,003 km (0.095 R)
• M36: 12,216,611 km (0.075 R)
• M37: 12,513,413 km (0.074 R)
• M38: 12,737,660 km (0.025 R)
• M39: 13,647,814 km (0.033 R)
• M40: 13,840,047 km (0.063 R)
• M41: 14,618,106 km (0.073 R)
• M42: 14,893,814 km (0.095 R)
• M43: 15,290,548 km (0.068 R)
• M44: 15,410,376 km (0.08 R)
• M45: 15,530,353 km (0.051 R)
• M46: 16,054,245 km (0.086 R)
• M47: 16,257,249 km (0.085 R)
• M48: 18,080,548 km (0.089 R)
• M49: 18,589,031 km (0.047 R)
• M50: 19,706,827 km (0.065 R)
• M51: 19,924,342 km (0.111 R)
• M52: 20,449,431 km (0.107 R)
• M53: 21,068,018 km (0.108 R)
• M54: 21,334,900 km (0.094 R)
• M55: 21,827,377 km (0.078 R)
• M56: 22,641,039 km (0.05 R)
• M57: 23,695,405 km (0.109 R)
• M58: 24,298,434 km (0.058 R)
• M59: 24,765,628 km (0.113 R)
• M60: 25,141,717 km (0.086 R)
• M61: 25,661,720 km (0.057 R)
• M62: 25,994,575 km (0.057 R)
• M63: 26,568,432 km (0.112 R)
• M64: 26,760,516 km (0.117 R)
• M65: 26,856,857 km (0.032 R)
• M66: 28,265,919 km (0.095 R)
• M67: 28,560,477 km (0.07 R)
• M68: 29,848,515 km (0.072 R)
• M69: 31,104,988 km (0.085 R)
• M70: 31,714,150 km (0.075 R)
• M71: 31,918,052 km (0.116 R)
• M72: 32,686,836 km (0.115 R)
• M73: 33,047,666 km (0.09 R)
• M74: 34,451,642 km (0.079 R)
• M75: 34,818,904 km (0.099 R)
• M76: 34,976,581 km (0.09 R)
• M77: 35,081,897 km (0.066 R)

Planet 6 - Gas Giant

Semi-Major Axis: 7.69 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 77.9

Radius: 8

Gravity: 1.22 G

Time & Orbit

Eccentricity (e): 0.103

Orbit Range: 6.9 AU - 8.48 AU

Year: 8077 Days

Day: 12 Hours

Environment

Temp: -167 °C

Axial Tilt: 4.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (79)

Outer Limit: 63,385,121 km

• M1: 104,569 km (0.105 R)
• M2: 160,519 km (0.115 R)
• M3: 247,884 km (0.112 R)
• M4: 631,602 km (0.112 R)
• M5: 752,328 km (0.104 R)
• M6: 922,121 km (0.087 R)
• M7: 985,252 km (0.047 R)
• M8: 1,049,728 km (0.079 R)
• M9: 1,430,455 km (0.11 R)
• M10: 1,554,172 km (0.083 R)
• M11: 1,655,600 km (0.111 R)
• M12: 1,707,211 km (0.086 R)
• M13: 1,759,271 km (0.09 R)
• M14: 2,153,461 km (0.085 R)
• M15: 2,634,718 km (0.115 R)
• M16: 3,132,729 km (0.057 R)
• M17: 3,392,581 km (0.094 R)
• M18: 3,642,708 km (0.115 R)
• M19: 3,693,422 km (0.093 R)
• M20: 3,761,339 km (0.103 R)
• M21: 4,055,149 km (0.05 R)
• M22: 4,213,723 km (0.084 R)
• M23: 4,338,488 km (0.09 R)
• M24: 4,537,004 km (0.098 R)
• M25: 4,924,463 km (0.083 R)
• M26: 5,037,110 km (0.112 R)
• M27: 5,150,505 km (0.105 R)
• M28: 5,438,032 km (0.091 R)
• M29: 5,613,062 km (0.066 R)
• M30: 5,869,173 km (0.096 R)
• M31: 5,948,759 km (0.106 R)
• M32: 6,189,761 km (0.118 R)
• M33: 6,291,039 km (0.077 R)
• M34: 6,660,396 km (0.113 R)
• M35: 6,764,217 km (0.08 R)
• M36: 6,847,693 km (0.043 R)
• M37: 6,931,617 km (0.085 R)
• M38: 7,121,457 km (0.096 R)
• M39: 7,506,372 km (0.086 R)
• M40: 8,318,689 km (0.085 R)
• M41: 8,565,675 km (0.068 R)
• M42: 9,320,845 km (0.103 R)
• M43: 9,507,094 km (0.074 R)
• M44: 9,741,664 km (0.114 R)
• M45: 9,978,178 km (0.083 R)
• M46: 10,360,550 km (0.065 R)
• M47: 10,505,211 km (0.109 R)
• M48: 10,772,094 km (0.098 R)
• M49: 10,869,781 km (0.068 R)
• M50: 11,041,220 km (0.095 R)
• M51: 11,312,741 km (0.111 R)
• M52: 12,343,470 km (0.116 R)
• M53: 12,445,645 km (0.112 R)
• M54: 12,548,120 km (0.059 R)
• M55: 12,857,189 km (0.112 R)
• M56: 13,116,592 km (0.091 R)
• M57: 13,168,801 km (0.102 R)
• M58: 13,667,112 km (0.12 R)
• M59: 13,905,421 km (0.09 R)
• M60: 14,065,042 km (0.105 R)
• M61: 14,198,484 km (0.105 R)
• M62: 14,790,741 km (0.102 R)
• M63: 15,117,314 km (0.117 R)
• M64: 15,226,520 km (0.086 R)
• M65: 15,363,701 km (0.043 R)
• M66: 15,943,842 km (0.097 R)
• M67: 15,999,492 km (0.088 R)
• M68: 16,194,568 km (0.066 R)
• M69: 16,278,492 km (0.12 R)
• M70: 16,446,790 km (0.072 R)
• M71: 16,700,209 km (0.091 R)
• M72: 16,841,579 km (0.116 R)
• M73: 17,068,519 km (0.079 R)
• M74: 17,813,366 km (0.066 R)
• M75: 18,451,850 km (0.099 R)
• M76: 19,393,868 km (0.094 R)
• M77: 19,572,189 km (0.101 R)
• M78: 19,990,614 km (0.119 R)
• M79: 20,110,591 km (0.104 R)

Planet 7 - Gas Giant

Semi-Major Axis: 9.68 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 269.3

Radius: 9.5

Gravity: 2.98 G

Time & Orbit

Eccentricity (e): 0.032

Orbit Range: 9.37 AU - 9.99 AU

Year: 11407 Days

Day: 13.3 Hours

Environment

Temp: -169 °C

Axial Tilt: 33.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (86)

Outer Limit: 63,385,121 km

• M1: 131,646 km (0.075 R)
• M2: 242,797 km (0.101 R)
• M3: 470,934 km (0.088 R)
• M4: 918,830 km (0.106 R)
• M5: 1,290,581 km (0.104 R)
• M6: 1,418,487 km (0.1 R)
• M7: 1,589,178 km (0.092 R)
• M8: 1,667,268 km (0.113 R)
• M9: 1,766,751 km (0.087 R)
• M10: 2,034,830 km (0.092 R)
• M11: 2,228,260 km (0.078 R)
• M12: 2,382,795 km (0.064 R)
• M13: 3,085,456 km (0.107 R)
• M14: 3,233,408 km (0.097 R)
• M15: 3,308,207 km (0.06 R)
• M16: 3,691,327 km (0.093 R)
• M17: 4,251,422 km (0.072 R)
• M18: 4,361,077 km (0.074 R)
• M19: 4,724,301 km (0.028 R)
• M20: 4,809,422 km (0.081 R)
• M21: 5,097,248 km (0.113 R)
• M22: 5,599,299 km (0.116 R)
• M23: 5,932,752 km (0.107 R)
• M24: 6,055,572 km (0.102 R)
• M25: 6,179,290 km (0.111 R)
• M26: 6,971,261 km (0.11 R)
• M27: 7,068,499 km (0.03 R)
• M28: 7,561,275 km (0.11 R)
• M29: 7,761,586 km (0.094 R)
• M30: 7,828,756 km (0.053 R)
• M31: 8,167,445 km (0.074 R)
• M32: 8,545,479 km (0.103 R)
• M33: 9,034,963 km (0.104 R)
• M34: 9,141,028 km (0.114 R)
• M35: 9,211,938 km (0.067 R)
• M36: 10,446,120 km (0.098 R)
• M37: 10,743,969 km (0.078 R)
• M38: 10,931,565 km (0.045 R)
• M39: 11,234,052 km (0.098 R)
• M40: 11,462,787 km (0.055 R)
• M41: 11,654,422 km (0.05 R)
• M42: 11,924,745 km (0.086 R)
• M43: 12,275,253 km (0.112 R)
• M44: 13,306,731 km (0.113 R)
• M45: 13,832,866 km (0.037 R)
• M46: 14,863,745 km (0.082 R)
• M47: 15,748,766 km (0.094 R)
• M48: 17,525,540 km (0.037 R)
• M49: 17,657,934 km (0.104 R)
• M50: 18,594,716 km (0.088 R)
• M51: 18,955,845 km (0.117 R)
• M52: 19,456,101 km (0.109 R)
• M53: 19,914,618 km (0.094 R)
• M54: 20,330,500 km (0.109 R)
• M55: 21,076,694 km (0.092 R)
• M56: 21,453,232 km (0.12 R)
• M57: 21,642,324 km (0.101 R)
• M58: 21,784,442 km (0.073 R)
• M59: 22,165,169 km (0.095 R)
• M60: 23,174,805 km (0.1 R)
• M61: 23,807,304 km (0.074 R)
• M62: 24,742,141 km (0.062 R)
• M63: 26,040,501 km (0.112 R)
• M64: 26,393,852 km (0.117 R)
• M65: 26,698,134 km (0.113 R)
• M66: 26,850,574 km (0.116 R)
• M67: 27,105,489 km (0.097 R)
• M68: 27,668,874 km (0.103 R)
• M69: 28,963,793 km (0.099 R)
• M70: 29,645,062 km (0.099 R)
• M71: 30,225,502 km (0.083 R)
• M72: 30,384,524 km (0.091 R)
• M73: 31,023,158 km (0.105 R)
• M74: 31,237,083 km (0.082 R)
• M75: 32,205,579 km (0.092 R)
• M76: 32,911,083 km (0.115 R)
• M77: 33,676,725 km (0.042 R)
• M78: 33,786,529 km (0.086 R)
• M79: 33,951,536 km (0.119 R)
• M80: 34,337,648 km (0.107 R)
• M81: 34,780,607 km (0.069 R)
• M82: 36,008,507 km (0.084 R)
• M83: 36,853,735 km (0.105 R)
• M84: 37,648,698 km (0.03 R)
• M85: 37,819,688 km (0.065 R)
• M86: 37,933,981 km (0.114 R)

Planet 8 - Ice Giant

Semi-Major Axis: 17.87 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 193.5

Radius: 5

Gravity: 7.74 G

Time & Orbit

Eccentricity (e): 0

Orbit Range: 17.87 AU - 17.87 AU

Year: 28611 Days

Day: 22 Hours

Environment

Temp: -201 °C

Axial Tilt: 34.4 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (89)

Outer Limit: 63,385,121 km

• M1: 178,470 km (0.056 R)
• M2: 268,827 km (0.099 R)
• M3: 327,619 km (0.098 R)
• M4: 358,885 km (0.071 R)
• M5: 666,608 km (0.105 R)
• M6: 856,747 km (0.069 R)
• M7: 1,184,965 km (0.075 R)
• M8: 1,311,076 km (0.087 R)
• M9: 1,362,837 km (0.115 R)
• M10: 1,576,313 km (0.106 R)
• M11: 1,687,165 km (0.092 R)
• M12: 2,247,558 km (0.116 R)
• M13: 2,793,740 km (0.069 R)
• M14: 2,962,038 km (0.086 R)
• M15: 3,308,357 km (0.06 R)
• M16: 3,667,541 km (0.114 R)
• M17: 4,229,431 km (0.111 R)
• M18: 4,539,847 km (0.114 R)
• M19: 4,618,685 km (0.066 R)
• M20: 5,683,522 km (0.11 R)
• M21: 5,768,494 km (0.107 R)
• M22: 5,982,718 km (0.094 R)
• M23: 6,374,964 km (0.107 R)
• M24: 6,419,095 km (0.074 R)
• M25: 6,596,369 km (0.051 R)
• M26: 6,865,495 km (0.038 R)
• M27: 7,229,915 km (0.1 R)
• M28: 7,600,619 km (0.119 R)
• M29: 8,025,028 km (0.072 R)
• M30: 8,946,102 km (0.093 R)
• M31: 9,144,319 km (0.118 R)
• M32: 9,343,883 km (0.119 R)
• M33: 9,646,071 km (0.075 R)
• M34: 10,208,110 km (0.093 R)
• M35: 10,676,052 km (0.069 R)
• M36: 10,991,704 km (0.086 R)
• M37: 12,838,340 km (0.087 R)
• M38: 13,682,969 km (0.105 R)
• M39: 14,140,739 km (0.103 R)
• M40: 14,603,595 km (0.063 R)
• M41: 15,189,121 km (0.082 R)
• M42: 15,901,805 km (0.098 R)
• M43: 16,930,141 km (0.114 R)
• M44: 17,544,988 km (0.089 R)
• M45: 17,606,772 km (0.095 R)
• M46: 18,167,016 km (0.111 R)
• M47: 19,689,473 km (0.083 R)
• M48: 20,205,885 km (0.119 R)
• M49: 21,120,527 km (0.087 R)
• M50: 22,383,133 km (0.07 R)
• M51: 22,719,429 km (0.083 R)
• M52: 23,193,055 km (0.077 R)
• M53: 27,097,710 km (0.096 R)
• M54: 27,672,016 km (0.106 R)
• M55: 29,565,626 km (0.092 R)
• M56: 29,639,228 km (0.045 R)
• M57: 30,527,989 km (0.07 R)
• M58: 30,676,988 km (0.097 R)
• M59: 30,826,287 km (0.115 R)
• M60: 31,050,534 km (0.064 R)
• M61: 31,425,576 km (0.088 R)
• M62: 32,787,964 km (0.119 R)
• M63: 35,491,796 km (0.042 R)
• M64: 35,883,742 km (0.101 R)
• M65: 36,356,172 km (0.11 R)
• M66: 37,147,994 km (0.114 R)
• M67: 37,307,016 km (0.106 R)
• M68: 40,371,828 km (0.104 R)
• M69: 40,453,508 km (0.112 R)
• M70: 42,931,148 km (0.054 R)
• M71: 43,600,000 km (0.062 R)
• M72: 44,019,921 km (0.115 R)
• M73: 44,694,458 km (0.108 R)
• M74: 45,797,892 km (0.08 R)
• M75: 46,738,414 km (0.087 R)
• M76: 48,725,822 km (0.113 R)
• M77: 49,336,031 km (0.06 R)
• M78: 50,828,719 km (0.094 R)
• M79: 50,916,982 km (0.081 R)
• M80: 52,514,388 km (0.109 R)
• M81: 54,038,192 km (0.119 R)
• M82: 54,850,807 km (0.09 R)
• M83: 56,396,602 km (0.08 R)
• M84: 57,037,330 km (0.107 R)
• M85: 57,129,033 km (0.074 R)
• M86: 57,864,606 km (0.103 R)
• M87: 60,931,662 km (0.057 R)
• M88: 61,025,459 km (0.069 R)
• M89: 62,343,117 km (0.119 R)

Kuiper Belt

Range: 30 - 59 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 427 - 12,952 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit