🌌 Stone's Star System Generator

Asteroid Belt

Center: 0.67 AU

Composition

Type: Main (Rocky/Icy Mix)

A dense region of planetesimals and debris.

Boundary

Planet 1 - Gas Giant

Semi-Major Axis: 1.34 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 843.1

Radius: 13.3

Gravity: 4.77 G

Time & Orbit

Eccentricity (e): 0.168

Orbit Range: 1.11 AU - 1.57 AU

Year: 1052 Days

Day: 5.1 Hours

Environment

Temp: -185 °C

Axial Tilt: 33.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (55)

Outer Limit: 45,794,750 km

• M1: 165,754 km (0.1 R)
• M2: 280,346 km (0.114 R)
• M3: 415,882 km (0.106 R)
• M4: 533,017 km (0.083 R)
• M5: 750,084 km (0.11 R)
• M6: 901,028 km (0.108 R)
• M7: 1,092,513 km (0.03 R)
• M8: 1,205,011 km (0.062 R)
• M9: 1,601,146 km (0.098 R)
• M10: 1,687,165 km (0.069 R)
• M11: 1,819,110 km (0.049 R)
• M12: 2,028,547 km (0.075 R)
• M13: 2,323,704 km (0.068 R)
• M14: 2,461,633 km (0.109 R)
• M15: 2,663,590 km (0.096 R)
• M16: 2,818,723 km (0.104 R)
• M17: 3,149,035 km (0.088 R)
• M18: 3,258,391 km (0.094 R)
• M19: 3,357,874 km (0.069 R)
• M20: 3,582,570 km (0.047 R)
• M21: 3,835,689 km (0.117 R)
• M22: 4,166,301 km (0.092 R)
• M23: 4,250,524 km (0.085 R)
• M24: 4,359,581 km (0.106 R)
• M25: 4,779,951 km (0.074 R)
• M26: 4,893,496 km (0.087 R)
• M27: 5,007,938 km (0.038 R)
• M28: 5,097,547 km (0.091 R)
• M29: 5,200,770 km (0.118 R)
• M30: 5,330,621 km (0.119 R)
• M31: 5,593,614 km (0.083 R)
• M32: 5,700,128 km (0.071 R)
• M33: 6,009,945 km (0.057 R)
• M34: 6,408,474 km (0.099 R)
• M35: 6,674,309 km (0.093 R)
• M36: 6,972,458 km (0.055 R)
• M37: 7,332,988 km (0.064 R)
• M38: 7,420,503 km (0.032 R)
• M39: 7,714,613 km (0.114 R)
• M40: 7,848,203 km (0.089 R)
• M41: 7,967,583 km (0.081 R)
• M42: 8,208,286 km (0.054 R)
• M43: 8,481,900 km (0.091 R)
• M44: 8,681,464 km (0.063 R)
• M45: 9,007,138 km (0.109 R)
• M46: 9,179,325 km (0.025 R)
• M47: 9,431,697 km (0.101 R)
• M48: 9,798,661 km (0.086 R)
• M49: 10,072,873 km (0.074 R)
• M50: 10,219,031 km (0.116 R)
• M51: 10,415,153 km (0.07 R)
• M52: 10,562,956 km (0.088 R)
• M53: 10,728,112 km (0.077 R)
• M54: 10,944,131 km (0.11 R)
• M55: 11,279,231 km (0.112 R)

Planet 2 - Gas Giant

Semi-Major Axis: 1.87 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 383.3

Radius: 11.6

Gravity: 2.85 G

Time & Orbit

Eccentricity (e): 0.14

Orbit Range: 1.61 AU - 2.13 AU

Year: 1734 Days

Day: 14.9 Hours

Environment

Temp: -205 °C

Axial Tilt: 23.7 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (58)

Outer Limit: 45,794,750 km

• M1: 173,534 km (0.119 R)
• M2: 248,781 km (0.113 R)
• M3: 336,296 km (0.118 R)
• M4: 533,915 km (0.057 R)
• M5: 636,389 km (0.073 R)
• M6: 719,865 km (0.076 R)
• M7: 913,893 km (0.104 R)
• M8: 987,645 km (0.103 R)
• M9: 1,141,731 km (0.106 R)
• M10: 1,254,677 km (0.063 R)
• M11: 1,431,352 km (0.118 R)
• M12: 1,553,873 km (0.076 R)
• M13: 1,634,506 km (0.099 R)
• M14: 1,828,535 km (0.088 R)
• M15: 1,904,530 km (0.104 R)
• M16: 2,109,180 km (0.041 R)
• M17: 2,290,493 km (0.086 R)
• M18: 2,424,832 km (0.076 R)
• M19: 2,561,714 km (0.098 R)
• M20: 3,192,419 km (0.076 R)
• M21: 3,273,201 km (0.083 R)
• M22: 3,378,070 km (0.037 R)
• M23: 3,484,134 km (0.102 R)
• M24: 3,808,911 km (0.11 R)
• M25: 4,068,464 km (0.057 R)
• M26: 4,168,844 km (0.083 R)
• M27: 4,894,842 km (0.038 R)
• M28: 5,136,592 km (0.054 R)
• M29: 5,231,737 km (0.076 R)
• M30: 5,617,998 km (0.057 R)
• M31: 5,800,508 km (0.093 R)
• M32: 5,928,115 km (0.096 R)
• M33: 6,301,810 km (0.066 R)
• M34: 6,609,234 km (0.104 R)
• M35: 6,683,285 km (0.106 R)
• M36: 6,996,842 km (0.1 R)
• M37: 7,254,300 km (0.038 R)
• M38: 7,376,521 km (0.062 R)
• M39: 7,453,265 km (0.115 R)
• M40: 7,592,092 km (0.084 R)
• M41: 7,841,023 km (0.119 R)
• M42: 7,919,412 km (0.033 R)
• M43: 8,124,361 km (0.117 R)
• M44: 8,701,061 km (0.083 R)
• M45: 9,010,729 km (0.086 R)
• M46: 9,142,225 km (0.077 R)
• M47: 9,607,624 km (0.035 R)
• M48: 9,708,453 km (0.048 R)
• M49: 9,978,776 km (0.091 R)
• M50: 10,166,073 km (0.026 R)
• M51: 10,268,697 km (0.114 R)
• M52: 10,630,873 km (0.107 R)
• M53: 10,927,077 km (0.094 R)
• M54: 11,670,429 km (0.118 R)
• M55: 11,760,038 km (0.074 R)
• M56: 11,849,947 km (0.077 R)
• M57: 11,940,004 km (0.09 R)
• M58: 12,175,322 km (0.12 R)

Planet 3 - Gas Giant

Semi-Major Axis: 2.46 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 811.5

Radius: 12.9

Gravity: 4.88 G

Time & Orbit

Eccentricity (e): 0.061

Orbit Range: 2.31 AU - 2.61 AU

Year: 2617 Days

Day: 6 Hours

Environment

Temp: -214 °C

Axial Tilt: 125.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (73)

Outer Limit: 45,794,750 km

• M1: 175,179 km (0.107 R)
• M2: 262,095 km (0.081 R)
• M3: 493,823 km (0.091 R)
• M4: 661,671 km (0.114 R)
• M5: 811,568 km (0.063 R)
• M6: 963,410 km (0.077 R)
• M7: 1,114,355 km (0.036 R)
• M8: 1,465,910 km (0.093 R)
• M9: 1,641,986 km (0.077 R)
• M10: 2,687,975 km (0.084 R)
• M11: 2,780,725 km (0.071 R)
• M12: 2,921,646 km (0.088 R)
• M13: 3,033,097 km (0.036 R)
• M14: 3,129,737 km (0.047 R)
• M15: 3,765,977 km (0.114 R)
• M16: 3,852,744 km (0.07 R)
• M17: 4,134,885 km (0.077 R)
• M18: 4,738,213 km (0.116 R)
• M19: 4,907,708 km (0.089 R)
• M20: 5,040,850 km (0.049 R)
• M21: 5,194,487 km (0.095 R)
• M22: 5,744,857 km (0.076 R)
• M23: 5,925,721 km (0.108 R)
• M24: 6,190,360 km (0.118 R)
• M25: 6,334,572 km (0.106 R)
• M26: 6,858,464 km (0.093 R)
• M27: 7,948,135 km (0.031 R)
• M28: 8,308,217 km (0.118 R)
• M29: 8,444,650 km (0.105 R)
• M30: 8,604,720 km (0.089 R)
• M31: 8,696,723 km (0.098 R)
• M32: 8,858,438 km (0.099 R)
• M33: 9,044,538 km (0.086 R)
• M34: 9,326,081 km (0.055 R)
• M35: 9,444,263 km (0.113 R)
• M36: 9,562,894 km (0.096 R)
• M37: 9,825,738 km (0.094 R)
• M38: 9,970,100 km (0.104 R)
• M39: 10,358,605 km (0.089 R)
• M40: 10,677,847 km (0.093 R)
• M41: 10,801,565 km (0.09 R)
• M42: 11,604,456 km (0.038 R)
• M43: 11,731,615 km (0.091 R)
• M44: 11,833,790 km (0.113 R)
• M45: 11,936,115 km (0.088 R)
• M46: 12,661,216 km (0.085 R)
• M47: 13,029,077 km (0.116 R)
• M48: 13,134,843 km (0.077 R)
• M49: 13,694,937 km (0.098 R)
• M50: 14,235,434 km (0.108 R)
• M51: 14,317,264 km (0.114 R)
• M52: 14,508,450 km (0.104 R)
• M53: 14,893,515 km (0.116 R)
• M54: 14,976,392 km (0.115 R)
• M55: 15,115,070 km (0.11 R)
• M56: 15,701,793 km (0.09 R)
• M57: 15,786,315 km (0.104 R)
• M58: 15,899,112 km (0.116 R)
• M59: 15,983,934 km (0.096 R)
• M60: 16,267,572 km (0.093 R)
• M61: 17,799,155 km (0.067 R)
• M62: 17,946,060 km (0.05 R)
• M63: 18,063,793 km (0.109 R)
• M64: 18,656,650 km (0.115 R)
• M65: 18,776,029 km (0.115 R)
• M66: 18,895,557 km (0.081 R)
• M67: 19,436,803 km (0.046 R)
• M68: 19,527,608 km (0.098 R)
• M69: 19,679,001 km (0.102 R)
• M70: 19,861,361 km (0.077 R)
• M71: 20,074,837 km (0.118 R)
• M72: 20,197,059 km (0.119 R)
• M73: 20,442,399 km (0.082 R)

Planet 4 - Gas Giant

Semi-Major Axis: 4.67 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 247.2

Radius: 11.3

Gravity: 1.94 G

Time & Orbit

Eccentricity (e): 0.009

Orbit Range: 4.63 AU - 4.71 AU

Year: 6845 Days

Day: 9 Hours

Environment

Temp: -230 °C

Axial Tilt: 28.7 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (84)

Outer Limit: 45,794,750 km

• M1: 152,739 km (0.106 R)
• M2: 244,742 km (0.089 R)
• M3: 367,412 km (0.113 R)
• M4: 518,357 km (0.119 R)
• M5: 703,858 km (0.104 R)
• M6: 805,435 km (0.107 R)
• M7: 900,280 km (0.052 R)
• M8: 1,168,659 km (0.101 R)
• M9: 1,596,209 km (0.069 R)
• M10: 2,054,128 km (0.082 R)
• M11: 2,695,903 km (0.1 R)
• M12: 3,124,800 km (0.107 R)
• M13: 3,396,620 km (0.05 R)
• M14: 3,575,539 km (0.099 R)
• M15: 3,942,652 km (0.116 R)
• M16: 4,046,772 km (0.074 R)
• M17: 4,151,939 km (0.079 R)
• M18: 4,257,855 km (0.098 R)
• M19: 4,669,099 km (0.114 R)
• M20: 4,823,783 km (0.119 R)
• M21: 5,161,276 km (0.083 R)
• M22: 5,367,422 km (0.119 R)
• M23: 5,576,261 km (0.09 R)
• M24: 5,693,545 km (0.097 R)
• M25: 5,764,305 km (0.063 R)
• M26: 5,882,787 km (0.111 R)
• M27: 6,098,357 km (0.091 R)
• M28: 6,170,763 km (0.109 R)
• M29: 6,340,706 km (0.069 R)
• M30: 6,463,226 km (0.079 R)
• M31: 6,810,293 km (0.037 R)
• M32: 6,885,541 km (0.097 R)
• M33: 6,986,221 km (0.115 R)
• M34: 7,496,948 km (0.104 R)
• M35: 7,678,560 km (0.115 R)
• M36: 8,178,964 km (0.082 R)
• M37: 9,018,059 km (0.118 R)
• M38: 9,601,939 km (0.064 R)
• M39: 9,686,462 km (0.079 R)
• M40: 10,284,405 km (0.053 R)
• M41: 11,100,312 km (0.066 R)
• M42: 11,576,033 km (0.101 R)
• M43: 11,906,794 km (0.062 R)
• M44: 12,332,549 km (0.116 R)
• M45: 12,455,070 km (0.072 R)
• M46: 12,547,222 km (0.103 R)
• M47: 12,825,025 km (0.106 R)
• M48: 13,544,442 km (0.111 R)
• M49: 14,276,873 km (0.076 R)
• M50: 14,696,644 km (0.028 R)
• M51: 14,826,495 km (0.089 R)
• M52: 15,350,238 km (0.106 R)
• M53: 15,449,122 km (0.117 R)
• M54: 16,415,823 km (0.07 R)
• M55: 16,991,625 km (0.115 R)
• M56: 17,401,972 km (0.11 R)
• M57: 17,815,760 km (0.034 R)
• M58: 17,954,437 km (0.101 R)
• M59: 18,058,557 km (0.042 R)
• M60: 18,162,977 km (0.087 R)
• M61: 18,547,593 km (0.034 R)
• M62: 19,111,726 km (0.05 R)
• M63: 19,324,754 km (0.09 R)
• M64: 19,502,925 km (0.103 R)
• M65: 19,681,545 km (0.08 R)
• M66: 19,753,202 km (0.072 R)
• M67: 20,365,506 km (0.076 R)
• M68: 20,910,940 km (0.105 R)
• M69: 21,240,504 km (0.06 R)
• M70: 21,682,715 km (0.085 R)
• M71: 22,053,419 km (0.08 R)
• M72: 22,202,269 km (0.104 R)
• M73: 22,314,168 km (0.107 R)
• M74: 22,538,565 km (0.111 R)
• M75: 22,801,259 km (0.092 R)
• M76: 22,989,602 km (0.043 R)
• M77: 23,102,698 km (0.084 R)
• M78: 23,595,474 km (0.057 R)
• M79: 23,938,651 km (0.107 R)
• M80: 24,629,943 km (0.031 R)
• M81: 24,977,908 km (0.103 R)
• M82: 25,249,877 km (0.116 R)
• M83: 26,189,351 km (0.108 R)
• M84: 26,465,659 km (0.119 R)

Planet 5 - Gas Giant

Semi-Major Axis: 5.51 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 937.8

Radius: 14.4

Gravity: 4.52 G

Time & Orbit

Eccentricity (e): 0.118

Orbit Range: 4.86 AU - 6.16 AU

Year: 8772 Days

Day: 6.8 Hours

Environment

Temp: -222 °C

Axial Tilt: 20 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (75)

Outer Limit: 45,794,750 km

• M1: 201,658 km (0.052 R)
• M2: 1,341,145 km (0.119 R)
• M3: 1,903,783 km (0.111 R)
• M4: 2,099,008 km (0.035 R)
• M5: 2,509,654 km (0.099 R)
• M6: 3,202,142 km (0.088 R)
• M7: 3,525,274 km (0.096 R)
• M8: 3,615,332 km (0.096 R)
• M9: 4,299,293 km (0.037 R)
• M10: 5,023,496 km (0.096 R)
• M11: 5,296,363 km (0.111 R)
• M12: 5,679,633 km (0.106 R)
• M13: 6,000,071 km (0.088 R)
• M14: 6,289,842 km (0.115 R)
• M15: 6,473,399 km (0.076 R)
• M16: 6,584,401 km (0.104 R)
• M17: 6,845,748 km (0.11 R)
• M18: 7,186,981 km (0.059 R)
• M19: 7,611,689 km (0.118 R)
• M20: 8,164,005 km (0.113 R)
• M21: 8,729,335 km (0.07 R)
• M22: 9,475,080 km (0.072 R)
• M23: 10,155,152 km (0.076 R)
• M24: 10,370,872 km (0.064 R)
• M25: 10,719,286 km (0.105 R)
• M26: 11,293,742 km (0.043 R)
• M27: 11,742,535 km (0.109 R)
• M28: 11,832,892 km (0.086 R)
• M29: 12,014,504 km (0.064 R)
• M30: 12,197,163 km (0.083 R)
• M31: 13,029,975 km (0.066 R)
• M32: 13,123,623 km (0.1 R)
• M33: 14,217,183 km (0.12 R)
• M34: 14,507,403 km (0.086 R)
• M35: 14,799,418 km (0.077 R)
• M36: 15,241,181 km (0.072 R)
• M37: 15,687,431 km (0.101 R)
• M38: 15,837,029 km (0.111 R)
• M39: 15,987,225 km (0.073 R)
• M40: 16,087,605 km (0.077 R)
• M41: 16,389,943 km (0.081 R)
• M42: 16,592,498 km (0.091 R)
• M43: 17,102,777 km (0.117 R)
• M44: 17,825,783 km (0.088 R)
• M45: 19,946,333 km (0.075 R)
• M46: 20,434,471 km (0.074 R)
• M47: 20,652,584 km (0.093 R)
• M48: 21,422,415 km (0.113 R)
• M49: 21,699,620 km (0.079 R)
• M50: 22,201,521 km (0.069 R)
• M51: 22,538,415 km (0.11 R)
• M52: 23,501,825 km (0.041 R)
• M53: 24,826,664 km (0.073 R)
• M54: 25,821,490 km (0.062 R)
• M55: 26,531,482 km (0.104 R)
• M56: 27,368,033 km (0.106 R)
• M57: 27,789,600 km (0.087 R)
• M58: 29,435,625 km (0.112 R)
• M59: 29,991,232 km (0.05 R)
• M60: 32,312,093 km (0.078 R)
• M61: 34,885,326 km (0.093 R)
• M62: 35,081,000 km (0.078 R)
• M63: 35,801,613 km (0.097 R)
• M64: 37,992,324 km (0.106 R)
• M65: 39,544,701 km (0.069 R)
• M66: 39,748,753 km (0.056 R)
• M67: 40,705,581 km (0.115 R)
• M68: 42,154,885 km (0.104 R)
• M69: 43,060,550 km (0.107 R)
• M70: 46,030,367 km (0.058 R)
• M71: 46,316,548 km (0.037 R)
• M72: 46,962,811 km (0.053 R)
• M73: 47,756,727 km (0.066 R)
• M74: 48,119,202 km (0.084 R)
• M75: 48,773,693 km (0.076 R)

Planet 6 - Ice Giant

Semi-Major Axis: 6.73 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 426

Radius: 5.6

Gravity: 13.58 G

Time & Orbit

Eccentricity (e): 0.238

Orbit Range: 5.13 AU - 8.33 AU

Year: 11842 Days

Day: 24.7 Hours

Environment

Temp: -234 °C

Axial Tilt: 25.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (88)

Outer Limit: 45,794,750 km

• M1: 85,869 km (0.074 R)
• M2: 198,965 km (0.111 R)
• M3: 307,274 km (0.086 R)
• M4: 520,750 km (0.089 R)
• M5: 691,890 km (0.073 R)
• M6: 827,426 km (0.09 R)
• M7: 916,437 km (0.104 R)
• M8: 990,039 km (0.11 R)
• M9: 1,283,699 km (0.091 R)
• M10: 1,408,464 km (0.12 R)
• M11: 1,647,671 km (0.106 R)
• M12: 1,715,140 km (0.094 R)
• M13: 1,899,594 km (0.093 R)
• M14: 2,066,246 km (0.095 R)
• M15: 2,188,168 km (0.112 R)
• M16: 2,464,924 km (0.108 R)
• M17: 2,725,972 km (0.109 R)
• M18: 2,995,997 km (0.104 R)
• M19: 3,274,697 km (0.093 R)
• M20: 3,503,582 km (0.108 R)
• M21: 4,159,419 km (0.075 R)
• M22: 4,313,804 km (0.119 R)
• M23: 4,564,530 km (0.107 R)
• M24: 4,788,029 km (0.092 R)
• M25: 5,888,471 km (0.079 R)
• M26: 8,076,639 km (0.105 R)
• M27: 8,230,576 km (0.079 R)
• M28: 8,541,590 km (0.12 R)
• M29: 8,659,024 km (0.109 R)
• M30: 8,975,274 km (0.085 R)
• M31: 9,375,747 km (0.083 R)
• M32: 10,277,374 km (0.07 R)
• M33: 10,360,700 km (0.104 R)
• M34: 10,907,779 km (0.06 R)
• M35: 10,950,265 km (0.086 R)
• M36: 11,464,134 km (0.111 R)
• M37: 11,637,218 km (0.061 R)
• M38: 12,783,288 km (0.1 R)
• M39: 12,917,776 km (0.098 R)
• M40: 13,143,071 km (0.095 R)
• M41: 13,597,549 km (0.113 R)
• M42: 13,918,735 km (0.088 R)
• M43: 14,010,888 km (0.108 R)
• M44: 14,709,061 km (0.1 R)
• M45: 15,993,957 km (0.105 R)
• M46: 16,284,476 km (0.114 R)
• M47: 17,215,573 km (0.119 R)
• M48: 17,413,791 km (0.1 R)
• M49: 19,026,456 km (0.047 R)
• M50: 19,334,178 km (0.104 R)
• M51: 19,695,308 km (0.049 R)
• M52: 20,214,861 km (0.086 R)
• M53: 21,002,793 km (0.071 R)
• M54: 21,693,786 km (0.116 R)
• M55: 21,907,860 km (0.061 R)
• M56: 24,586,859 km (0.065 R)
• M57: 24,642,509 km (0.069 R)
• M58: 25,992,929 km (0.047 R)
• M59: 26,277,315 km (0.116 R)
• M60: 27,772,545 km (0.065 R)
• M61: 28,530,408 km (0.071 R)
• M62: 28,647,543 km (0.059 R)
• M63: 28,764,978 km (0.085 R)
• M64: 29,000,146 km (0.104 R)
• M65: 31,326,692 km (0.081 R)
• M66: 31,508,004 km (0.052 R)
• M67: 31,689,915 km (0.089 R)
• M68: 32,542,773 km (0.104 R)
• M69: 32,972,119 km (0.07 R)
• M70: 33,279,842 km (0.073 R)
• M71: 33,341,476 km (0.083 R)
• M72: 33,588,612 km (0.101 R)
• M73: 33,836,346 km (0.041 R)
• M74: 34,146,761 km (0.096 R)
• M75: 34,645,371 km (0.079 R)
• M76: 35,965,871 km (0.108 R)
• M77: 36,219,290 km (0.099 R)
• M78: 36,600,465 km (0.111 R)
• M79: 37,366,855 km (0.077 R)
• M80: 37,945,051 km (0.069 R)
• M81: 39,762,964 km (0.044 R)
• M82: 40,024,910 km (0.04 R)
• M83: 40,550,597 km (0.113 R)
• M84: 40,946,433 km (0.071 R)
• M85: 41,874,987 km (0.082 R)
• M86: 43,415,247 km (0.085 R)
• M87: 45,110,640 km (0.098 R)
• M88: 45,794,751 km (0.086 R)

Kuiper Belt

Range: 30 - 47 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 217 - 12,451 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit