🌌 Stone's Star System Generator

Planet 1 - Terrestrial

Semi-Major Axis: 0.54 AU

Status: Inner (Hot)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 0.86

Radius: 0.94

Gravity: 0.97 G

Time & Orbit

Eccentricity (e): 0.027

Orbit Range: 0.53 AU - 0.55 AU

Year: 139 Days

Day: 38.4 Hours

Environment

Temp: 268 °C

Axial Tilt: 28.8 °

Atmosphere: Dense CO₂

Biome: Volcanic/Barren

Satellites (1)

Outer Limit: 61,564,913 km

• M1: 68,067 km (0.026 R)

Planet 2 - Terrestrial

Semi-Major Axis: 0.95 AU

Status: Inner (Hot)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 0.74

Radius: 0.89

Gravity: 0.93 G

Time & Orbit

Eccentricity (e): 0.133

Orbit Range: 0.82 AU - 1.08 AU

Year: 325 Days

Day: 34.8 Hours

Environment

Temp: 127 °C

Axial Tilt: 8.8 °

Atmosphere: Dense CO₂

Biome: Volcanic/Barren

Asteroid Belt

Center: 1.39 AU

Composition

Type: Inner System (Rocky)

A dense region of planetesimals and debris.

Boundary

Planet 3 - Terrestrial

Semi-Major Axis: 1.82 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 0.67

Radius: 0.85

Gravity: 0.93 G

Time & Orbit

Eccentricity (e): 0.058

Orbit Range: 1.71 AU - 1.93 AU

Year: 863 Days

Day: 32.5 Hours

Environment

Temp: -41 °C

Axial Tilt: 31.5 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Asteroid Belt

Center: 3.67 AU

Composition

Type: Inner (Rocky/Metallic)

A dense region of planetesimals and debris.

Boundary

Planet 4 - Gas Giant

Semi-Major Axis: 5.52 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 936.4

Radius: 15

Gravity: 4.16 G

Time & Orbit

Eccentricity (e): 0.152

Orbit Range: 4.68 AU - 6.36 AU

Year: 4558 Days

Day: 9.5 Hours

Environment

Temp: -136 °C

Axial Tilt: 11.4 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (78)

Outer Limit: 61,564,913 km

• M1: 189,391 km (0.102 R)
• M2: 341,233 km (0.109 R)
• M3: 456,124 km (0.112 R)
• M4: 590,612 km (0.118 R)
• M5: 693,685 km (0.109 R)
• M6: 962,662 km (0.077 R)
• M7: 1,118,244 km (0.073 R)
• M8: 1,392,158 km (0.03 R)
• M9: 1,654,702 km (0.067 R)
• M10: 1,757,476 km (0.114 R)
• M11: 1,880,296 km (0.095 R)
• M12: 2,134,911 km (0.069 R)
• M13: 2,518,929 km (0.102 R)
• M14: 2,904,293 km (0.089 R)
• M15: 3,200,646 km (0.103 R)
• M16: 3,374,629 km (0.111 R)
• M17: 3,529,313 km (0.111 R)
• M18: 3,823,123 km (0.088 R)
• M19: 4,101,674 km (0.087 R)
• M20: 4,196,071 km (0.097 R)
• M21: 4,315,001 km (0.109 R)
• M22: 4,580,836 km (0.078 R)
• M23: 4,678,823 km (0.082 R)
• M24: 5,179,527 km (0.058 R)
• M25: 5,909,565 km (0.088 R)
• M26: 6,588,739 km (0.112 R)
• M27: 6,867,440 km (0.115 R)
• M28: 7,235,750 km (0.032 R)
• M29: 7,350,342 km (0.077 R)
• M30: 7,697,858 km (0.101 R)
• M31: 9,547,037 km (0.079 R)
• M32: 9,990,146 km (0.116 R)
• M33: 10,214,393 km (0.034 R)
• M34: 10,537,375 km (0.074 R)
• M35: 11,028,505 km (0.061 R)
• M36: 11,227,021 km (0.094 R)
• M37: 11,493,604 km (0.055 R)
• M38: 12,203,297 km (0.089 R)
• M39: 12,443,102 km (0.12 R)
• M40: 12,580,732 km (0.112 R)
• M41: 13,241,805 km (0.096 R)
• M42: 13,950,001 km (0.084 R)
• M43: 14,272,684 km (0.045 R)
• M44: 14,962,181 km (0.104 R)
• M45: 15,071,985 km (0.037 R)
• M46: 15,218,891 km (0.103 R)
• M47: 15,329,443 km (0.099 R)
• M48: 15,848,548 km (0.095 R)
• M49: 16,638,126 km (0.116 R)
• M50: 17,133,295 km (0.119 R)
• M51: 17,325,079 km (0.037 R)
• M52: 17,710,892 km (0.101 R)
• M53: 17,827,129 km (0.095 R)
• M54: 18,373,012 km (0.102 R)
• M55: 18,490,746 km (0.071 R)
• M56: 18,805,948 km (0.111 R)
• M57: 19,721,786 km (0.098 R)
• M58: 20,084,262 km (0.109 R)
• M59: 20,408,142 km (0.095 R)
• M60: 20,570,904 km (0.067 R)
• M61: 21,555,707 km (0.095 R)
• M62: 21,804,338 km (0.037 R)
• M63: 22,472,143 km (0.074 R)
• M64: 22,598,105 km (0.105 R)
• M65: 22,808,439 km (0.103 R)
• M66: 24,170,678 km (0.096 R)
• M67: 24,385,949 km (0.097 R)
• M68: 24,645,052 km (0.079 R)
• M69: 25,209,635 km (0.109 R)
• M70: 25,340,533 km (0.119 R)
• M71: 27,152,014 km (0.118 R)
• M72: 28,868,200 km (0.115 R)
• M73: 29,233,967 km (0.086 R)
• M74: 29,509,227 km (0.037 R)
• M75: 29,739,309 km (0.111 R)
• M76: 29,969,989 km (0.076 R)
• M77: 30,526,194 km (0.118 R)
• M78: 31,085,690 km (0.095 R)

Planet 5 - Gas Giant

Semi-Major Axis: 6.19 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 472.7

Radius: 12.1

Gravity: 3.23 G

Time & Orbit

Eccentricity (e): 0.125

Orbit Range: 5.42 AU - 6.96 AU

Year: 5413 Days

Day: 6.8 Hours

Environment

Temp: -152 °C

Axial Tilt: 31.4 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (75)

Outer Limit: 61,564,913 km

• M1: 155,133 km (0.063 R)
• M2: 303,235 km (0.058 R)
• M3: 382,821 km (0.104 R)
• M4: 531,222 km (0.045 R)
• M5: 657,632 km (0.101 R)
• M6: 748,289 km (0.096 R)
• M7: 831,764 km (0.086 R)
• M8: 969,843 km (0.079 R)
• M9: 1,088,923 km (0.034 R)
• M10: 1,679,535 km (0.086 R)
• M11: 2,323,105 km (0.118 R)
• M12: 2,709,816 km (0.11 R)
• M13: 2,843,257 km (0.088 R)
• M14: 3,097,125 km (0.113 R)
• M15: 3,881,616 km (0.117 R)
• M16: 4,296,301 km (0.054 R)
• M17: 4,725,348 km (0.094 R)
• M18: 4,980,263 km (0.11 R)
• M19: 5,358,895 km (0.075 R)
• M20: 5,455,086 km (0.118 R)
• M21: 5,746,952 km (0.113 R)
• M22: 5,894,904 km (0.065 R)
• M23: 6,270,245 km (0.114 R)
• M24: 6,653,515 km (0.107 R)
• M25: 7,044,414 km (0.043 R)
• M26: 7,123,551 km (0.101 R)
• M27: 7,766,972 km (0.045 R)
• M28: 8,994,572 km (0.07 R)
• M29: 9,109,164 km (0.044 R)
• M30: 9,984,311 km (0.115 R)
• M31: 10,162,632 km (0.066 R)
• M32: 10,855,719 km (0.053 R)
• M33: 11,008,459 km (0.107 R)
• M34: 11,131,129 km (0.086 R)
• M35: 11,316,032 km (0.101 R)
• M36: 11,688,830 km (0.089 R)
• M37: 11,876,725 km (0.109 R)
• M38: 12,128,947 km (0.09 R)
• M39: 12,255,656 km (0.115 R)
• M40: 12,478,557 km (0.086 R)
• M41: 12,831,608 km (0.052 R)
• M42: 12,928,398 km (0.105 R)
• M43: 13,350,862 km (0.073 R)
• M44: 13,481,760 km (0.047 R)
• M45: 13,646,019 km (0.116 R)
• M46: 13,811,025 km (0.11 R)
• M47: 15,324,806 km (0.105 R)
• M48: 15,461,987 km (0.076 R)
• M49: 15,702,989 km (0.096 R)
• M50: 15,910,482 km (0.048 R)
• M51: 16,223,440 km (0.09 R)
• M52: 16,997,160 km (0.066 R)
• M53: 17,495,770 km (0.109 R)
• M54: 17,710,892 km (0.04 R)
• M55: 17,854,805 km (0.105 R)
• M56: 18,071,423 km (0.094 R)
• M57: 18,252,735 km (0.038 R)
• M58: 18,580,355 km (0.102 R)
• M59: 19,020,322 km (0.091 R)
• M60: 20,022,777 km (0.105 R)
• M61: 20,852,298 km (0.039 R)
• M62: 21,080,434 km (0.094 R)
• M63: 21,156,729 km (0.086 R)
• M64: 23,092,675 km (0.119 R)
• M65: 23,250,052 km (0.087 R)
• M66: 23,368,235 km (0.103 R)
• M67: 23,724,128 km (0.102 R)
• M68: 23,803,415 km (0.063 R)
• M69: 24,241,288 km (0.094 R)
• M70: 24,883,063 km (0.076 R)
• M71: 25,856,047 km (0.112 R)
• M72: 26,841,448 km (0.104 R)
• M73: 27,338,861 km (0.062 R)
• M74: 27,588,540 km (0.095 R)
• M75: 28,090,591 km (0.074 R)

Planet 6 - Gas Giant

Semi-Major Axis: 9.65 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 201.6

Radius: 10.7

Gravity: 1.76 G

Time & Orbit

Eccentricity (e): 0.041

Orbit Range: 9.25 AU - 10.05 AU

Year: 10536 Days

Day: 12.6 Hours

Environment

Temp: -168 °C

Axial Tilt: 13.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (80)

Outer Limit: 61,564,913 km

• M1: 212,429 km (0.104 R)
• M2: 468,092 km (0.114 R)
• M3: 568,771 km (0.1 R)
• M4: 677,978 km (0.085 R)
• M5: 821,891 km (0.112 R)
• M6: 1,204,113 km (0.077 R)
• M7: 1,398,590 km (0.106 R)
• M8: 1,534,126 km (0.11 R)
• M9: 1,621,192 km (0.108 R)
• M10: 1,691,952 km (0.116 R)
• M11: 1,948,512 km (0.074 R)
• M12: 2,376,961 km (0.12 R)
• M13: 3,162,499 km (0.105 R)
• M14: 3,319,876 km (0.069 R)
• M15: 3,712,570 km (0.105 R)
• M16: 3,783,480 km (0.11 R)
• M17: 4,416,877 km (0.066 R)
• M18: 4,517,257 km (0.098 R)
• M19: 4,771,574 km (0.043 R)
• M20: 5,056,857 km (0.062 R)
• M21: 5,188,353 km (0.065 R)
• M22: 5,644,178 km (0.051 R)
• M23: 5,808,137 km (0.101 R)
• M24: 6,196,793 km (0.092 R)
• M25: 6,565,402 km (0.089 R)
• M26: 6,941,192 km (0.088 R)
• M27: 7,116,969 km (0.112 R)
• M28: 7,593,139 km (0.071 R)
• M29: 8,733,374 km (0.06 R)
• M30: 9,018,807 km (0.103 R)
• M31: 9,566,335 km (0.111 R)
• M32: 9,794,921 km (0.067 R)
• M33: 10,224,266 km (0.118 R)
• M34: 10,357,558 km (0.064 R)
• M35: 10,862,900 km (0.05 R)
• M36: 10,999,034 km (0.107 R)
• M37: 11,135,617 km (0.107 R)
• M38: 11,410,727 km (0.093 R)
• M39: 11,897,519 km (0.065 R)
• M40: 12,462,101 km (0.097 R)
• M41: 12,711,929 km (0.061 R)
• M42: 12,783,587 km (0.053 R)
• M43: 12,891,447 km (0.107 R)
• M44: 13,180,171 km (0.089 R)
• M45: 13,325,430 km (0.102 R)
• M46: 13,874,903 km (0.118 R)
• M47: 13,985,606 km (0.107 R)
• M48: 14,394,307 km (0.117 R)
• M49: 14,469,106 km (0.064 R)
• M50: 15,033,688 km (0.039 R)
• M51: 15,605,451 km (0.109 R)
• M52: 17,602,583 km (0.077 R)
• M53: 18,407,569 km (0.109 R)
• M54: 18,529,342 km (0.113 R)
• M55: 19,430,669 km (0.073 R)
• M56: 20,095,033 km (0.08 R)
• M57: 20,262,284 km (0.071 R)
• M58: 21,318,295 km (0.046 R)
• M59: 22,305,641 km (0.117 R)
• M60: 22,957,439 km (0.119 R)
• M61: 23,044,804 km (0.112 R)
• M62: 23,351,629 km (0.081 R)
• M63: 23,792,195 km (0.114 R)
• M64: 24,950,531 km (0.12 R)
• M65: 25,220,406 km (0.102 R)
• M66: 25,310,613 km (0.111 R)
• M67: 25,853,953 km (0.065 R)
• M68: 26,722,219 km (0.101 R)
• M69: 27,414,408 km (0.09 R)
• M70: 27,739,484 km (0.101 R)
• M71: 27,879,209 km (0.068 R)
• M72: 28,112,581 km (0.099 R)
• M73: 28,299,728 km (0.06 R)
• M74: 28,393,526 km (0.062 R)
• M75: 28,816,589 km (0.094 R)
• M76: 29,147,051 km (0.03 R)
• M77: 29,954,879 km (0.062 R)
• M78: 31,253,239 km (0.102 R)
• M79: 32,324,510 km (0.075 R)
• M80: 32,667,986 km (0.08 R)

Planet 7 - Gas Giant

Semi-Major Axis: 11.37 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 295.2

Radius: 13

Gravity: 1.75 G

Time & Orbit

Eccentricity (e): 0.126

Orbit Range: 9.94 AU - 12.8 AU

Year: 13475 Days

Day: 5.9 Hours

Environment

Temp: -172 °C

Axial Tilt: 39.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (81)

Outer Limit: 61,564,913 km

• M1: 242,498 km (0.117 R)
• M2: 390,301 km (0.063 R)
• M3: 567,874 km (0.12 R)
• M4: 1,065,586 km (0.117 R)
• M5: 1,157,439 km (0.085 R)
• M6: 1,310,477 km (0.082 R)
• M7: 1,595,312 km (0.051 R)
• M8: 1,789,191 km (0.092 R)
• M9: 1,968,259 km (0.105 R)
• M10: 2,393,267 km (0.087 R)
• M11: 2,541,369 km (0.075 R)
• M12: 2,769,655 km (0.095 R)
• M13: 2,873,177 km (0.112 R)
• M14: 3,328,253 km (0.098 R)
• M15: 3,980,351 km (0.067 R)
• M16: 4,216,566 km (0.115 R)
• M17: 4,579,490 km (0.109 R)
• M18: 5,239,217 km (0.055 R)
• M19: 5,563,844 km (0.118 R)
• M20: 5,728,850 km (0.106 R)
• M21: 5,828,483 km (0.104 R)
• M22: 6,438,992 km (0.114 R)
• M23: 7,034,391 km (0.082 R)
• M24: 7,176,958 km (0.116 R)
• M25: 7,904,901 km (0.111 R)
• M26: 8,240,150 km (0.057 R)
• M27: 8,352,947 km (0.087 R)
• M28: 8,580,186 km (0.092 R)
• M29: 9,196,080 km (0.117 R)
• M30: 9,430,650 km (0.108 R)
• M31: 9,866,129 km (0.068 R)
• M32: 9,985,957 km (0.051 R)
• M33: 10,389,123 km (0.106 R)
• M34: 10,715,546 km (0.101 R)
• M35: 10,921,243 km (0.043 R)
• M36: 11,003,821 km (0.091 R)
• M37: 11,253,051 km (0.082 R)
• M38: 11,799,532 km (0.106 R)
• M39: 12,097,381 km (0.08 R)
• M40: 13,049,721 km (0.119 R)
• M41: 13,891,509 km (0.089 R)
• M42: 14,750,948 km (0.12 R)
• M43: 14,842,353 km (0.088 R)
• M44: 15,488,017 km (0.108 R)
• M45: 16,520,990 km (0.058 R)
• M46: 17,770,432 km (0.079 R)
• M47: 18,554,474 km (0.083 R)
• M48: 19,650,877 km (0.071 R)
• M49: 19,751,556 km (0.084 R)
• M50: 20,004,078 km (0.1 R)
• M51: 20,257,796 km (0.112 R)
• M52: 20,563,574 km (0.106 R)
• M53: 21,490,033 km (0.114 R)
• M54: 22,535,423 km (0.116 R)
• M55: 23,383,643 km (0.066 R)
• M56: 24,296,340 km (0.092 R)
• M57: 26,489,594 km (0.108 R)
• M58: 26,935,845 km (0.062 R)
• M59: 27,835,676 km (0.043 R)
• M60: 28,005,619 km (0.086 R)
• M61: 28,403,250 km (0.046 R)
• M62: 29,261,643 km (0.119 R)
• M63: 31,356,312 km (0.092 R)
• M64: 31,474,046 km (0.077 R)
• M65: 32,779,437 km (0.097 R)
• M66: 33,138,621 km (0.091 R)
• M67: 33,559,141 km (0.099 R)
• M68: 33,679,717 km (0.098 R)
• M69: 34,163,067 km (0.08 R)
• M70: 34,527,189 km (0.1 R)
• M71: 35,136,800 km (0.106 R)
• M72: 35,381,692 km (0.052 R)
• M73: 36,366,794 km (0.048 R)
• M74: 36,738,544 km (0.052 R)
• M75: 37,298,639 km (0.069 R)
• M76: 37,798,744 km (0.066 R)
• M77: 39,312,525 km (0.09 R)
• M78: 39,694,149 km (0.104 R)
• M79: 40,460,839 km (0.112 R)
• M80: 42,073,952 km (0.096 R)
• M81: 42,594,703 km (0.12 R)

Planet 8 - Gas Giant

Semi-Major Axis: 11.67 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 739.3

Radius: 8.1

Gravity: 11.27 G

Time & Orbit

Eccentricity (e): 0.183

Orbit Range: 9.53 AU - 13.81 AU

Year: 14011 Days

Day: 11.1 Hours

Environment

Temp: -167 °C

Axial Tilt: 7.1 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (91)

Outer Limit: 61,564,913 km

• M1: 110,852 km (0.082 R)
• M2: 202,556 km (0.102 R)
• M3: 261,647 km (0.098 R)
• M4: 373,396 km (0.045 R)
• M5: 436,227 km (0.083 R)
• M6: 1,049,579 km (0.119 R)
• M7: 1,239,119 km (0.11 R)
• M8: 1,313,021 km (0.117 R)
• M9: 1,787,994 km (0.089 R)
• M10: 2,103,047 km (0.105 R)
• M11: 2,849,690 km (0.074 R)
• M12: 2,981,635 km (0.116 R)
• M13: 3,217,551 km (0.108 R)
• M14: 4,485,243 km (0.091 R)
• M15: 4,716,522 km (0.117 R)
• M16: 5,598,252 km (0.079 R)
• M17: 5,931,406 km (0.079 R)
• M18: 6,792,192 km (0.052 R)
• M19: 7,508,766 km (0.098 R)
• M20: 8,296,399 km (0.118 R)
• M21: 8,628,356 km (0.09 R)
• M22: 8,771,821 km (0.069 R)
• M23: 9,158,681 km (0.072 R)
• M24: 10,250,895 km (0.081 R)
• M25: 11,226,871 km (0.085 R)
• M26: 11,752,558 km (0.12 R)
• M27: 12,286,174 km (0.049 R)
• M28: 12,501,894 km (0.083 R)
• M29: 12,882,321 km (0.11 R)
• M30: 13,432,393 km (0.054 R)
• M31: 13,654,546 km (0.074 R)
• M32: 15,417,407 km (0.1 R)
• M33: 15,533,645 km (0.118 R)
• M34: 16,414,178 km (0.102 R)
• M35: 17,250,729 km (0.108 R)
• M36: 18,654,854 km (0.098 R)
• M37: 19,151,819 km (0.119 R)
• M38: 19,590,290 km (0.074 R)
• M39: 20,861,124 km (0.084 R)
• M40: 21,376,788 km (0.071 R)
• M41: 21,506,489 km (0.099 R)
• M42: 21,701,415 km (0.113 R)
• M43: 22,552,627 km (0.055 R)
• M44: 23,214,897 km (0.065 R)
• M45: 24,423,049 km (0.119 R)
• M46: 24,490,817 km (0.036 R)
• M47: 25,308,220 km (0.1 R)
• M48: 25,445,401 km (0.069 R)
• M49: 25,927,256 km (0.068 R)
• M50: 26,412,102 km (0.082 R)
• M51: 26,481,665 km (0.117 R)
• M52: 27,180,138 km (0.108 R)
• M53: 27,884,744 km (0.087 R)
• M54: 28,452,767 km (0.07 R)
• M55: 28,952,873 km (0.093 R)
• M56: 29,167,994 km (0.06 R)
• M57: 29,311,908 km (0.11 R)
• M58: 29,455,821 km (0.116 R)
• M59: 29,889,355 km (0.074 R)
• M60: 32,088,145 km (0.04 R)
• M61: 32,310,896 km (0.102 R)
• M62: 34,186,853 km (0.104 R)
• M63: 34,262,700 km (0.037 R)
• M64: 34,642,379 km (0.113 R)
• M65: 35,252,738 km (0.077 R)
• M66: 36,175,159 km (0.091 R)
• M67: 36,949,776 km (0.088 R)
• M68: 38,752,281 km (0.082 R)
• M69: 39,624,287 km (0.102 R)
• M70: 39,703,873 km (0.108 R)
• M71: 43,422,876 km (0.119 R)
• M72: 43,505,006 km (0.114 R)
• M73: 44,245,964 km (0.088 R)
• M74: 47,673,999 km (0.117 R)
• M75: 48,012,988 km (0.112 R)
• M76: 48,182,781 km (0.084 R)
• M77: 49,977,806 km (0.107 R)
• M78: 50,149,844 km (0.026 R)
• M79: 50,753,770 km (0.107 R)
• M80: 51,186,557 km (0.105 R)
• M81: 51,881,589 km (0.092 R)
• M82: 52,055,870 km (0.083 R)
• M83: 52,317,667 km (0.102 R)
• M84: 53,720,895 km (0.054 R)
• M85: 53,985,384 km (0.106 R)
• M86: 54,958,967 km (0.096 R)
• M87: 55,581,443 km (0.101 R)
• M88: 56,743,819 km (0.11 R)
• M89: 58,729,132 km (0.094 R)
• M90: 60,187,113 km (0.068 R)
• M91: 61,196,450 km (0.115 R)

Kuiper Belt

Range: 31.2 - 50.2 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 434 - 18,438 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit